Researcher Profile and Settings

Affiliation

• Faculty of Environmental Earth Science　Integrated Environmental Science　Conservation on Natural Environments

Job Title

• Associate Professor

Degree

• PhD（University of Tsukuba）

URL

http://gcoe.ees.hokudai.ac.jp/sato/index-j.html

Research funding number

• 10512270

J-Global ID

• 201001083927656100

Research Interests

• climate change   気候学   気象学   

Research Areas

• Environmental science/Agricultural science / Environmental dynamics
• Natural sciences / Atmospheric and hydrospheric science

Academic & Professional Experience

• 2018/07 - Today National Research Institute for Earth Science and Disaster Resilience Visiting Researcher
• 2015/04 - Today Hokkaido University Arctic Research Center
• 2013/01 - Today Hokkaido University Faculty of Environmental Earth Science Associate Professor
• 2009/04 - 2012/12 Hokkaido University Faculty of Environmental Earth Science Assistant Professor
• 2010/03 - 2010/06 University of California, Los Angeles
• 2007 - 2009 The University of Tokyo Center for Climate System Research
• 2006 - 2007 The University of Tokyo Center for Climate System Research
• 2006 - 2007 Postdoctoral Fellowships of Japan Society for the Promotion of Science
• 2002 - 2006 科学技術振興機構 研究員
• 2002 - 2006 Researcher

Education

•        - 2002  University of Tsukuba
•        - 2002  University of Tsukuba  Graduate School, Division of Earth Science
•        - 1999  University of Tsukuba
•        - 1999  University of Tsukuba  First Cluster of College

Association Memberships

• THE SOCIETY OF AGRICULTURAL METEOROLOGY OF JAPAN   THE JAPANESE SOCIETY OF SNOW AND ICE   アメリカ地球物理連合   アメリカ気象学会   日本気象学会   

Research Activities

Published Papers

• Ocean Sensitivity to Periodic and Constant Volcanism

  Muhammad Mubashar Dogar, Tomonori Sato, Fei Liu

  Scientific Reports 10 (1) 2020/12 [Refereed][Not invited]
  
• Direct measurement of leaf area index in a deciduous needle-leaf forest, eastern Siberia

  Nagai Shin, Ayumi Kotani, Tomonori Sato, Atsuko Sugimoto, Trofim C. Maximov, Aleksandr Nogovitcyn, Yumiko Miyamoto, Hideki Kobayashi, Shunsuke Tei

  Polar Science 25 100550 - 100550 1873-9652 2020/09 [Refereed][Not invited]
  
• Regional Projection of Tropical-Cyclone-Induced Extreme Precipitation around Japan Based on Large Ensemble Simulations

  Daisuke Hatsuzuka, Tomonori Sato, Kohei Yoshida, Masayoshi Ishii, Ryo Mizuta

  Scientific Online Letters on the Atmosphere 16 (0) 23 - 29 2020/02 [Refereed][Not invited]
  
• Responses of Polar Mesocyclone Genesis to Topographic Forcing along the Eastern Coast of Eurasian Continent

  Kenta TAMURA, Tomonori SATO

  Journal of the Meteorological Society of Japan. Ser. II 0026-1165 2020 [Refereed][Not invited]
  
• Memory effects of Eurasian land processes cause enhanced cooling in response to sea ice loss

  Tetsu Nakamura, Koji Yamazaki, Tomonori Sato, Jinro Ukita

  Nature Communications 10 (1) 2019/11 [Refereed][Not invited]
  
• Regional Climate Response of Middle Eastern, African, and South Asian Monsoon Regions to Explosive Volcanism and ENSO Forcing

  Muhammad Mubashar Dogar, Tomonori Sato

  Journal of Geophysical Research: Atmospheres 124 (14) 7580 - 7598 2169-897X 2019/07/27 [Refereed][Not invited]
  
• Intensification of hot Eurasian summers by climate change and land–atmosphere interactions

  Tomonori Sato, Tetsu Nakamura

  Scientific Reports 9 (1) 2019/07 [Refereed][Not invited]
  
• Observed Evidence of Enhanced Probability of Mesoscale Convective System Initiations due to Land Surface Heterogeneity in Semiarid East Asia

  Hiroki Teramura, Tomonori Sato, Kenta Tamura

  Scientific Online Letters on the Atmosphere 15 (0) 143 - 148 2019/05/31 [Refereed][Not invited]
  
• Future changes in monthly extreme precipitation in Japan using large-ensemble regional climate simulations

  Hatsuzuka, D, T. Sato

  Journal of Hydrometeorology 20 (3) 563 - 574 2019/03 [Refereed][Not invited]
  
• Effect of ENSO phase on the contribution of environmental variables to tropical cyclone genesis in the western North Pacific

  Ta-Huu. C, T. Sato

  International Journal of Climatology 39 2461 - 2473 2019 [Refereed][Not invited]
  
• Decreasing Number of Propagating Mesoscale Convective Systems in Bangladesh and Surrounding Area during 1998-2015

  Habib, S. M. A, T. Sato, D. Hatsuzuka

  Atmospheric Science Letters 20 (e879) 2019/01 [Refereed][Not invited]
  
• Analyses of extreme precipitation associated with the Kinugawa River flood in September 2015 using a large ensemble downscaling experiment

  Fujita, M, T. J. Yamada, T. Sato, S. Kawazoe, M. Nakano, K. Ito

  Journal of the Meteorological Society of Japan 2019 [Refereed][Not invited]
  
• 大量アンサンブル気候予測データを用いた大雨の時空間特性とその将来変化の分析

  星野剛, 山田朋人, 稲津將, 佐藤友徳, 川瀬宏明, 杉本志織

  土木学会論文集B1(水工学) 74 I_13 - I_18 2018/11 [Refereed][Not invited]
  
• Towards understanding the global and regional climatic impacts of Modoki magnitude

  Dogar M. M, F. Kucharski, T. Sato, S. Mehmood, S Ali, Z. Gong, D. Das, J. Arraut

  Global and Planetary Change 172 223 - 241 2018/10 [Refereed][Not invited]
  
• Interannual and spatial variability of solar radiation energy potential in Kenya using Meteosat satellite

  Boniface Wainaina Kariuki, Tomonori Sato

  RENEWABLE ENERGY 116 88 - 96 0960-1481 2018/02 [Refereed][Not invited]
   

  Kenya is faced with a rising demand in electricity resulting from a rapidly growing economy and an increasing population. Being a tropical country, lying astride the equator, solar energy is one of the readily available renewable energy resource options to meet this need. Unfortunately, there is still very low adoption of solar systems in the country which could be majorly attributed to lack of adequate solar resource assessment. Besides, past studies" on this area in Kenya only focused on the available amount of solar resource leaving out the issue of variability. To bridge this gap, the temporal and spatial variability of global horizontal irradiance (GHI) and direct normal Irradiance (DNI) is analyzed using 19-year long (1995-2013) Meteosat satellite dataset. GHI interannual variability is low in most parts of the country but DNI has a clearly higher variability except a few locations in the East and Northern desert. Low spatial variability for GHI was recorded for locations within 1225 km(2) while DNI variability was double that of GHI. The results offer readers a quick reference of variability of solar resource at different locations in Kenya which is useful in guiding measurement requirements and consequently in promoting deployment of solar systems. (C) 2017 The Authors. Published by Elsevier Ltd.
• Role of soil moisture-atmosphere feedback during high temperature events in 2002 over Northeast Eurasia

  Erdenebat Enkhbat, Sato Tomonori

  Progress in Earth and Planetary Science 5 2018 [Refereed][Not invited]
  
• Precipitation changes in a climate with 2 K surface warming from large ensemble simulations using 60 km global and 20 km regional atmospheric models

  Fujita, M, R. Mizuta, M. Ishii, H. Endo, T. Sato, Y. Okada, S. Kawazoe, S. Sugimoto, K. Ishihara, S. Watanabe

  Geophysical Research Letters 45 2018 [Refereed][Not invited]
  
• Analysis of climate trends and leading modes of climate variability for MENA region

  Dogar, M. M, T. Sato

  Journal of Geophysical Research Atmospheres 123 13074 - 13091 2018 [Refereed][Not invited]
  
• Contrasting Features of Monsoon Precipitation Around the Meghalaya Plateau Under Westerly and Easterly Regimes

  Hatsuki Fujinami, Tomonori Sato, Hironari Kanamori, Fumie Murata

  JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 122 (18) 9591 - 9610 2169-897X 2017/09 [Refereed][Not invited]
   

  Precipitation features around the Meghalaya Plateau, northeast India, during summer are investigated using a 17 year (1998-2014) high-spatial-resolution Tropical Rainfall Measuring Mission precipitation radar data set. Precipitation around the plateau fell into two distinct regimes based on the low-level wind direction that fluctuates on intraseasonal time scales over Bangladesh, windward of the plateau: a westerly regime (WR) and an easterly regime (ER). Under the WR, strong low-level onshore southwesterlies across Bangladesh encounter the plateau, and localized strong low-level southerlies running parallel to the Arakan Mountains (i.e., the barrier jet) also blow toward the plateau, concentrating convective unstable air onto its southern slopes. The low-level wind fields and large-scale upper level divergent fields promote frequent and intense orographic rainfall along the southern slopes due to forced uplift, generating high precipitation. In contrast, under the ER, strong southeasterlies that blow along the Gangetic Plain without encountering the plateau and subsidence inhibit upward motion around the plateau, resulting in low precipitation. Diurnal variations in precipitation significantly affect the daily precipitation around the plateau under both regimes. High rainfall frequency persists over the southern slopes between 2100 and 1200 LT of the next day under the WR, whereas modest rainfall frequency occurs between 0000 and 0600 LT under the ER, with a daytime minimum and nocturnal maximum in both regimes. The atmospheric boundary layer processes over Bangladesh regulate the wind speed and vertical structure of the low-level wind toward the plateau, with deceleration during daytime and acceleration at night (i.e., nocturnal jet) that result in the nocturnal rainfall maximum. Plain Language Summary The Meghalaya Plateau of northeast India is one of the wettest places in the world. Extreme rainfall often causes flooding across the flat lowlands of Bangladesh to the south of the plateau. This study reveals the features contributing to this heavy rainfall and the mechanisms responsible using a 17 year (1998-2014) high-spatial-resolution spaceborne precipitation radar (TRMM-PR) data set and state-of-the-art atmospheric circulation data (ERA-Interim). Precipitation around the plateau is highly sensitive to whether strong low-level southerly monsoon winds from the ocean have westerly or easterly components (westerly and easterly regimes, respectively) over Bangladesh, windward of the plateau. Under the westerly regime, strong low-level southwesterlies blow over Bangladesh directly toward the plateau and localized strong low-level southerlies running parallel to the Arakan Mountains also blow toward the plateau. These winds concentrate moist air onto the southern slopes of the plateau, and rainfall occurs as the air is forced upward. The large rainfall amounts are caused by frequent heavy rain. In contrast, under the easterly regime, strong southeasterlies blow along the Gangetic Plain through northwestern Bangladesh and avoid the plateau, resulting in less frequent and lighter rain around the plateau.
• Observed behaviours of precipitable water vapour and precipitation intensity in response to upper air profiles estimated from surface air temperature

  Mikiko Fujita, Tomonori Sato

  SCIENTIFIC REPORTS 7 2045-2322 2017/07 [Refereed][Not invited]
   

  Extremely heavy precipitation affects human society and the natural environment, and its behaviour under a warming climate needs to be elucidated. Recent studies have demonstrated that observed extreme precipitation increases with surface air temperature (SAT) at approximately the Clausius-Clapeyron (CC) rate, suggesting that atmospheric water vapour content can explain the relationship between extreme precipitation and SAT. However, the relationship between atmospheric water vapour content and SAT is poorly understood due to the lack of reliable observations with sufficient spatial and temporal coverage for statistical analyses. Here, we analyse the relationship between atmospheric water vapour content and SAT using precipitable water vapour (PWV) derived from global positioning system satellites. A super-CC rate appears in hourly PWV when the SAT is below 16 degrees C, whereas the rate decreases at high SAT, which is different from the precipitation-SAT relationship. The effects of upper air temperature and water vapour can consistently explain the super-CC rate of PWV relative to SAT. The difference between moist and dry adiabatic lapse rates increases with SAT, in consequence of more ability to hold water vapour in the free atmosphere under higher SAT conditions; therefore, attainable PWV increases more rapidly than the CC rate as SAT increases.
• Prediction of climatic suitability for wine grape production under the climatic change in Hokkaido

  Manabu Nemoto, Tomoyoshi Hirota, Tomonori Sato

  JOURNAL OF AGRICULTURAL METEOROLOGY 72 (3-4) 167 - 172 0021-8588 2016/09 [Refereed][Not invited]
   

  This paper investigates the shifts in climatic suitability for cultivating grapes (Vitis vinifera) in Hokkaido, Japan, throughout the 20th and 21st century. To assess area suitability over time, we used two climate model datasets and three climatic criteria (summer temperature, summer precipitation, and winter temperature). The optimum area for growth gradually enlarged from the 1990s to present (2010s), and this area will cover almost all of the Hokkaido region by the 2050s. Even when considering model uncertainties, almost all low elevation areas in Hokkaido are projected to be suitable for V. vinifera cultivation in the future.
• Response of the Baiu Rainband to Northwest Pacific SST Anomalies and Its Impact on Atmospheric Circulation

  Shinji Matsumura, Takeshi Horinouchi, Shiori Sugimoto, Tomonori Sato

  JOURNAL OF CLIMATE 29 (8) 3075 - 3093 0894-8755 2016/04 [Refereed][Not invited]
   

  The Pacific Japan (PJ) teleconnection pattern leads to a meridional precipitation dipole between the subtropics and East Asia in the summer of El Nino decaying years. However, observational analysis and model experiments indicate that increased sea surface temperature (SST) in the Kuroshio Oyashio Extension (KOE) region, where a strong northward-decreasing SST gradient occurs, induces a northward shift of baiu rainfall with the subtropical jet, forming a tripolar precipitation anomaly pattern over the northwest Pacific. In July, the leading empirical orthogonal function (EOF) mode for precipitation represents the meridional dipole between subtropical and baiu rainfalls, while EOF-2 features the northward-shifted baiu rainband. The PJ atmospheric forcing increases KOE SST, which enhances northward shifts in the subtropical jet and baiu rainband, resulting in oceanic forcing over the KOE. In experiments using a regional climate model the subtropical jet response to KOE SST forcing explains about 20% of the anomalies in the control experiment. The northward-shifted baiu condensational heating also enhances the northward shift of the subtropical jet with a northeastward extension. In August when the baiu rainband disappears, the northward shift of the subtropical jet is enhanced mainly by KOE SST variability. During the summer, as a result of increased KOE SST and the northward-shifted baiu heating, cyclonic anomalies intensify over the Sea of Okhotsk and anticyclonic anomalies intensify over the northwest Pacific, affecting the western Pacific subtropical high. The results suggest that air sea interaction over the KOE must be considered to better understand the summer northwest Pacific climate.
• Recent increase in heat wave frequency around Mongolia: role of atmospheric forcing and possible influence of soil moisture deficit

  Enkhbat Erdenebat, Tomonori Sato

  ATMOSPHERIC SCIENCE LETTERS 17 (2) 135 - 140 1530-261X 2016/02 [Refereed][Not invited]
   

  A 30-year meteorological station and reanalysis datasets revealed that the frequency and intensity of hot extremes have increased dramatically around Mongolia since the late 1990s. Many recent heat waves (HWs) were triggered by atmospheric forcing with a mid-tropospheric ridge pattern which appears frequently around Mongolia in 2000s. An observational data analysis for each HW event indicates that the rate of temperature increase at the beginning stage of HW is sensitive to the soil moisture condition. Therefore, it is suggested that the recent drier soil conditions played a role in enhancing the frequency and intensity of HWs and localization around Mongolia.
• An Oceanic Impact of the Kuroshio on Surface Air Temperature on the Pacific Coast of Japan in Summer: Regional H2O Greenhouse Gas Effect

  Hiroshi G. Takahashi, Sachiho A. Adachi, Tomonori Sato, Masayuki Hara, Xieyao Ma, Fujio Kimura

  JOURNAL OF CLIMATE 28 (18) 7128 - 7144 0894-8755 2015/09 [Refereed][Not invited]
   

  This study used a 4-km resolution regional climate model to examine the sensitivity of surface air temperature on the Pacific coast of Japan to sea surface temperature (SST) south of the Pacific coast of Japan during summer. The authors performed a control simulation (CTL) driven by reanalysis and observational SST datasets. A series of sensitivity experiments using climatological values from the CTL SST datasets over a 31-yr period was conducted. The interannual variation in surface air temperature over the Pacific coast was well simulated in CTL. The interannual variation in SST over the Kuroshio region amplified the interannual variation in surface air temperature over the Pacific coast. It was found that 30% of the total variance of interannual variation in surface air temperature can be controlled by interannual variation in SST. The calculated surface air temperature on the Pacific coast increased by 0.4 K per 1-K SST warming in the Kuroshio region. Note that this sensitivity was considerably greater during nighttime than during daytime. Concurrent with the warming in surface air temperature, downward longwave radiation at the surface was also increased. In summer, the increase in latent heat flux was considerably larger than that in sensible heat flux over the ocean because of SST warming, according to the temperature dependence of the Bowen ratio. This implies that the primary factor for the increase in surface air temperature in summer is increased moisture in the lower troposphere, indicating that the regional warming was caused by an increase in H2O greenhouse gas.
• Multi-GCM by multi-RAM experiments for dynamical downscaling on summertime climate change in Hokkaido

  Masaru Inatsu, Tomonori Sato, Tomohito J. Yamada, Ryusuke Kuno, Shiori Sugimoto, Murad A. Farukh, Yadu N. Pokhrel, Shuichi Kure

  ATMOSPHERIC SCIENCE LETTERS 16 (3) 297 - 304 1530-261X 2015/07 [Refereed][Not invited]
   

  The experiments with three general circulation models (GCMs) by three regional atmospheric models (RAMs) for the dynamical downscaling (DDS) have been performed to evaluate the uncertainty in the global warming response during summertime in Hokkaido, Japan. The results of a 10-year RAM integration nested into GCM under present or future climate conditions were synthesized after applying bias correction. For the target decades during which the global-mean temperature increases by 2 K in each GCM, the DDS results indicate that surface air temperature and precipitation mostly depend on the GCM imposed as the lateral boundary condition.
• Seasonal and diurnal variability in historical warming due to the urbanization of Hokkaido, Japan

  Shiori Sugimoto, Tomonori Sato, Tomonori Sasaki

  JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 120 (11) 5437 - 5445 2169-897X 2015/06 [Refereed][Not invited]
   

  The influence of historical urbanization on warming trends observed on Hokkaido Island (Japan) is discussed with an emphasis on seasonally and diurnally differential responses of air temperature to urban effects. Two numerical experiments using past and current land use scenarios successfully simulated the observed temperature trends, showing a greater rate of warming in winter than in summer and a greater increase in daily minimum than daily maximum temperatures. The results suggest that seasonal and diurnal variations in the thermal structure of the planetary boundary layer play a leading role in determining the warming rate of surface air. Under strongly stable stratification, anomalous heating within the urban canopy dissipates into a near-surface shallow layer, resulting in increased daily minimum temperatures during winter. In summer, however, anomalous urban heating due to increased Bowen ratios is attenuated by vertical mixing in the convective daytime boundary layer, suppressing the impact of urban heating on surface warming.
• Recent Intensification of the Western Pacific Subtropical High Associated with the East Asian Summer Monsoon

  Shinji Matsumura, Shiori Sugimoto, Tomonori Sato

  JOURNAL OF CLIMATE 28 (7) 2873 - 2883 0894-8755 2015/04 [Refereed][Not invited]
   

  The summer western Pacific subtropical high (WPSH) has intensified during the past three decades. However, the underlying mechanism is not yet well understood. Here, it is shown that baiu rainband activity in midsummer, which is part of the East Asian summer monsoon, plays an important role in recent intensification in the WPSH along the baiu rainband. In contrast with the WPSH, the summer Okhotsk high, which is located to the north of the baiu rainband, has weakened during the past three decades. The north-south contrasting changes between the two highs reflect a response to northward-moved and enhanced baiu heating, which intensifies the upper-tropospheric ridge, resulting in the baroclinic intensification of the WPSH. Regional climate model experiments also support the observational analysis. Therefore, baiu convective activity in midsummer can act as a major driver for the WPSH intensification. The results here suggest that the mechanism intensifying the summer North Pacific subtropical high clearly differs between the western and eastern Pacific.
• 地域気候変動の不確実性を考慮した北海道におけるてん菜糖量の将来変化

  友貞俊成, 佐藤友徳

  北海道の農業気象 67 13 - 21 2015 [Refereed][Not invited]
  
• The Distribution of Cool Spots as Microrefugia in a Mountainous Area.

  Ayuma Shimokawabe, Yuichi Yamaura, Takumi Akasaka, Tomonori Sato, Yuichiro Shida, Satoshi Yamanaka, Futoshi Nakamura

  PloS one 10 (8) e0135732  2015 [Refereed][Not invited]
   

  It has recently been proposed that microrefugia played an important role in species survival during past climate change events. However, the current distributions of microrefugia remain largely unknown. Wind-hole sites are areas affected by preferential flows of cool air generated in interstitial spaces created by rock fragments or colluvia. Alpine plant species occurring in lowland wind-hole sites isolated from alpine zones may be relicts of the last glacial period. Hokkaido, northern Japan, is known to contain many wind-hole sites in which alpine plant species can occur. Here we surveyed 55 wind-hole sites in the Kitami region, eastern Hokkaido, and observed two alpine plant species (lingonberry, Vaccinium vitis-idaea, and Labrador tea, Rhododendron groenlandicum ssp. diversipilosum var. diversipilosum) in 14 wind-hole sites. Statistical modeling showed that wind-hole sites are likely to occur in areas with high maximum slope angles and volcanic rock cover, and concave surfaces. Our predictions of wind-hole site distributions suggest that such topographic conditions are common in our study area, and that many undiscovered wind-hole sites exist. Ignoring microhabitats may greatly underestimate species distributions in topographically complex regions, and dispersed cool spots may also function as stepping stones and temporal habitats for cold-adapted species. Because these localized unique habitats usually occur in economically unproductive sites, identifying and protecting potential microrefugia (cool spots) would be a robust and cost-effective mitigation of climate change impacts.
• Role of Siberian Land-Atmosphere Coupling in the Development of the August Okhotsk High in 2008

  Shinji Matsumura, Koji Yamazaki, Tomonori Sato

  JOURNAL OF THE METEOROLOGICAL SOCIETY OF JAPAN 93 (2) 229 - 244 0026-1165 2015 [Refereed][Not invited]
   

  We investigate the formation mechanism of the summer Okhotsk High (OH) in terms of the land-atmosphere coupling in Siberia. A reanalysis data indicates that the formation mechanism of the OH clearly differs between early and late summer because it changes from a nearly barotropic to a baroclinic structure with seasonal changes. Then, we assess the influence of springtime snow cover on the formation of the late summer OH with the baroclinicity using a regional climate model. The model performs well in reproducing the land-atmosphere coupling in eastern Siberia and the OH in August 2008, when abnormal weather prevails in Japan, in conjunction with the intensively developed OH. The August OH develops with a distinct baroclinic structure owing to increased surface heating, which is related to land-atmosphere coupling in response to reduced spring snow cover in eastern Siberia. The land-atmosphere coupling can help to reinforce and maintain the baroclinic structure through surface heating, forming strong surface anticyclone to the southeast over the Sea of Okhotsk. Our results suggest that the late summer OH is a regional climate system that involves coupling among the atmosphere, the cool ocean, and the warm land surface.
• Impact of Land-Use Change on Winter Precipitation in Hokkaido, Japan

  Shiori Sugimoto, Tomonori Sato, Tomonori Sasaki

  SOLA 11 95 - 99 1349-6476 2015 [Refereed][Not invited]
   

  The effect of historical land-use change on winter precipitation in Hokkaido, Japan is evaluated by sensitivity experiments using a regional climate model and past and current land-use maps. The regional climate model successfully simulates winter precipitation characteristics, such as heavy precipitation in central mountain areas and around the Japan Sea coast, and a gradual decrease in precipitation from west to east. A comparison of model simulations using 1850 and 1985 land-use maps shows that precipitation has decreased approximately 1.7 mm mon(-1), especially over deforested areas. This decrease is mainly a result of reduced evapotranspiration (approximately 2.4 mm mon(-1)) from lower net radiation associated with increased snow cover and higher surface albedo. Meanwhile, precipitation has increased in mountainous areas and on leeward slopes as a result of intensified upward air motion, which is attributed to a decrease in surface roughness caused by deforestation and the strengthening of horizontal wind speeds.
• Evaluating the Role of Snow Cover in Urban Canopy Layer on the Urban Heat Island in Sapporo, Japan with a Regional Climate Model

  Keisuke Mori, Tomonori Sato

  JOURNAL OF THE METEOROLOGICAL SOCIETY OF JAPAN 93 (5) 581 - 592 0026-1165 2015 [Refereed][Not invited]
   

  Climate monitoring in urban areas is important because climate change in densely populated areas has a strong influence on society. The rate of long-term temperature increase in high-latitude snowy urban areas is relatively large due to global warming and urban heat islands. However, the influence of snow cover on urban heat islands is unclear. The purpose of this study is to assess the effect of snow cover in urban canopy layer on winter heat islands using a mesoscale atmospheric model coupled with an urban canopy model. Numerical experiments indicate that snow cover in urban areas serves to decrease surface air temperature, with a stronger decrease in daily maximum temperatures (0.4-0.6 degrees C) than daily minimum temperatures (0.1-0.3 degrees C). The increase in surface albedo is primarily responsible for the decrease in net shortwave radiation and sensible heat flux. In addition, increased evaporation causes a weakened sensible heat flux. The estimated snow cover effect during the day is comparable with the typical magnitude of anthropogenic heat release. In urban canopy layer, snow cover on roofs plays a significant role in reducing surface air temperature. Snow clearing on roads tends to increase nocturnal surface air temperature, especially in suburban areas because decreased snow depth increases ground heat transfer. These results indicate that snow cover in urban canopy layer reduces surface air temperature, resulting in weakened urban heat islands.
• Extreme precipitation intensity in future climates associated with the Clausius-Clapeyron-like relationship

  Yamada, T. J, M. A. Farukh, T. Fukushima, M. Inatsu, T. Sato, Y. N. Pokhrel, T. Oki

  Hydro. Res. Lett 8 108 - 113 2014 [Refereed][Not invited]
  
• Spatio-Temporal Variation of High-Temperature Events in Hokkaido, North Japan

  Keisuke Mori, Tomonori Sato

  JOURNAL OF THE METEOROLOGICAL SOCIETY OF JAPAN 92 (4) 327 - 346 0026-1165 2014 [Refereed][Not invited]
   

  This study investigated the spatiotemporal characteristics of high-temperature events in Hokkaido, Japan, using observational data of 26 years. Statistical analyses revealed that the annual mean frequency of these events was lower (higher) at stations on the western (eastern) side of Hokkaido. The frequency of these events showed clear seasonal variation with two distinct peaks occurring in January and May. In addition, the local time of the high-temperature onset was strongly dependent on the season; the onset occurred more frequently from 1600 to 0400 Japan Standard Time (JST) in January and from 0700 to 1300 JST in May. The seasonal dependence mechanism of the high-temperature onset was investigated in eastern Hokkaido, where the frequencies of both January and May high-temperature events were the highest. In January, an extratropical cyclone passage caused intensified warm advection and increased precipitable water vapor, leading to weakened radiative cooling during the night. In May, the high-temperature events were triggered by two different mechanisms related to solar insolation. The first mechanism is explained by dynamic foehn, which forms the subsidence of the high potential temperature layer on the lee of mountains. However, the nocturnal inversion layer prevented vertical mixing of the foehn-induced warm air aloft and cold air near the ground. The surface air temperature dramatically increased after sunrise when the nocturnal inversion layer disappeared. The second mechanism is explained by the combination of airflow diabatically heated by surface sensible heat flux and dynamic foehn. Therefore, solar insolation is the key factor that controlled the diurnal variation in high-temperature events in May.
• Sensitivity of cool summer-induced sterility of rice to increased growing-season temperatures: A case study in Hokkaido, Japan

  Akemi Tanaka, Tomonori Sato, Manabu Nemoto, Yasuhiro Yamanaka

  JOURNAL OF AGRICULTURAL METEOROLOGY 70 (1) 25 - 40 0021-8588 2014 [Refereed][Not invited]
   

  In Hokkaido, in northern Japan, rice yields are frequently affected by cool summers in the present climate. Recently, several studies have noted the possibility that cool summer damage may not be reduced even with global warming due to earlier rice phenology. We examined the changes in the range of rice sterility associated with rising temperatures focusing on inter-annual variation in temperature. By raising daily mean and daily maximum temperatures uniformly, we calculated the sterility rate of the Kirara397 variety locally planted in Hokkaido. Generally, long-term mean rice sterility decreases with rising temperatures. However, in each year and with each transplanting date, rice sterility remains identical to the present or even worsens in some cases. We called those cases "accelerated cool summer damage'' (ACSD). In the cases of rising temperature, the growth rate is accelerated, and the period of vulnerability to low temperatures become earlier. When the temperature during the earlier period of vulnerability is equal to or less than that during the original period of vulnerability in the present, ACSD occurs. Future rice sterility that induces cool summer damage may remain even if the temperatures rise associated with global warming, since the increase in temperature during the period of vulnerability is smaller than the range of inter-annual variation in temperature. We also found that there is a possibility that extremely high rice sterility is increased in a warmer climate if the range of inter-annual variation in temperature expands. This finding suggests that rice sterility may be increased by the inter-annual variation in temperature, even if the long-term mean sterility decreases as the temperature rises.
• スキー場で生じた笹の倒伏によるクラック及び全層雪崩 -笹の倒伏をもたらす積雪初期の気象条件-

  中村一樹, 佐藤友徳

  寒地技術シンポジウム論文集 29 10 - 15 2013/11 [Refereed][Not invited]
  
• Validating a regional climate model's downscaling ability for East Asian summer monsoonal interannual variability

  Tomonori Sato, Yongkang Xue

  Climate Dynamics 41 (9-10) 2411 - 2426 0930-7575 2013/11 [Refereed][Not invited]
   

  Performance of a regional climate model (RCM), WRF, for downscaling East Asian summer season climate is investigated based on 11-summer integrations associated with different climate conditions with reanalysis data as the lateral boundary conditions. It is found that while the RCM is essentially unable to improve large-scale circulation patterns in the upper troposphere for most years, it is able to simulate better lower-level meridional moisture transport in the East Asian summer monsoon. For precipitation downscaling, the RCM produces more realistic magnitude of the interannual variation in most areas of East Asia than that in the reanalysis. Furthermore, the RCM significantly improves the spatial pattern of summer rainfall over dry inland areas and mountainous areas, such as Mongolia and the Tibetan Plateau. Meanwhile, it reduces the wet bias over southeast China. Over Mongolia, however, the performance of precipitation downscaling strongly depends on the year: the WRF is skillful for normal and wet years, but not for dry years, which suggests that land surface processes play an important role in downscaling ability. Over the dry area of North China, the WRF shows the worst performance. Additional sensitivity experiments testing land effects in downscaling suggest the initial soil moisture condition and representation of land surface processes with different schemes are sources of uncertainty for precipitation downscaling. Correction of initial soil moisture using the climatology dataset from GSWP-2 is a useful approach to robustly reducing wet bias in inland areas as well as to improve spatial distribution of precipitation. Despite the improvement on RCM downscaling, regional analyses reveal that accurate simulation of precipitation over East China, where the precipitation pattern is strongly influenced by the activity of the Meiyu/Baiu rainfall band, is difficult. Since the location of the rainfall band is closely associated with both lower-level meridional moisture transport and upper-level circulation structures, it is necessary to have realistic upper-air circulation patterns in the RCM as well as lower-level moisture transport in order to improve the circulation-associated convective rainfall band in East Asia. © 2012 Springer-Verlag Berlin Heidelberg.
• A numerical experiment on the influence of the interannual variation of sea surface temperature on terrestrial precipitation in northern Japan during the cold season

  Tomonori Sato, Shiori Sugimoto

  WATER RESOURCES RESEARCH 49 (11) 7763 - 7777 0043-1397 2013/11 [Refereed][Not invited]
   

  The role of sea surface temperature (SST) anomaly in modulating the terrestrial precipitation in winter around Japan was investigated using a regional atmospheric model. Large amount of snowfall occurs as the westerly winter monsoon carries abundant moisture from the Japan Sea. An experiment with realistic SST gives improved representation of terrestrial precipitation distribution compared to the reanalysis. The standard deviation of interannual variation of precipitation in the experiment was approximately 20% larger over the Kuroshio extension than that in the experiment with climatology SST, suggesting that the SST variability enhances the oceanic precipitation variability. For the role of Japan Sea, the terrestrial precipitation over the Japan Sea side (JSS) region in northern Japan was sensitive to the offshore SST anomaly through affecting moisture flux toward Japan. Since the offshore SST was clearly warmer in the 2000s relative to the 1980s, the effect of the long-term SST variation on the terrestrial precipitation trend was examined. The experiment with realistic SST simulated the observed trend in terrestrial precipitation in the JSS region. In contrast, the precipitation trend was significantly reduced in the experiment with climatology SST. Therefore, the long-term SST trend is an important factor for the precipitation trend in the region of Japan and the adjacent oceans where SST has significant trends. Precipitation in southern Japan facing the Pacific Ocean indicated increasing trend even without the SST trend. This suggests that the long-term variations in extratropical cyclones are also an important factor for precipitation trends around the Kuroshio extension.
• Mechanism of orographic precipitation around the meghalaya plateau associated with intraseasonal oscillation and the diurnal cycle

  Tomonori Sato

  Monthly Weather Review 141 (7) 2451 - 2466 0027-0644 2013 [Refereed][Not invited]
   

  Mesoscale processes that cause tremendous amounts of precipitation around the Meghalaya Plateau, northeast India, were investigated using a regional atmospheric model, with a particular focus on the possible role of an intraseasonal oscillation (ISO) and the diurnal cycle. A numerical experiment was conducted using the Weather Research and Forecasting Model (WRF) to simulate a prominent submonthly-scale ISO event observed during June-July 2004. A WRF experiment successfully simulated the timing and magnitude of precipitation during the first active period and subsequent inactive period of the ISO, despite large biases in the second active period. The WRF experiment revealed that the magnitude of prevailing southwesterly winds in the lower troposphere differs significantly between active and inactive periods strong southwesterly flow transports abundant moisture to the southern slope of the Meghalaya Plateau during the active period, which triggers forced lifting and brings orographic precipitation. However, low-level wind during the inactive period is too weak to overcome the vertical stratification barrier hence, it is unable to reach the condensation level. The WRF experiment suggested that the diurnal cycle of precipitation is enhanced during the active period, exhibiting an evening to early morning maximum, as observed by the Tropical Rainfall Measuring Mission (TRMM). The experiment also indicated a prominent nocturnal low-level jet (LLJ) appearing at 900 hPa. The direction of the LLJ varies clockwise with time, which accelerates the preexisting southwesterly flow during 1800-0600 LT. The diurnal variation of the LLJ is responsible for the evening to early morning maximum of precipitation, thus contributing to the precipitation variability in the ISO. © 2013 American Meteorological Society.
• Effects of synoptic-scale control on long-term declining trends of summer fog frequency over the pacific side of Hokkaido Island

  Shiori Sugimoto, Tomonori Sato, Kazuki Nakamura

  Journal of Applied Meteorology and Climatology 52 (10) 2226 - 2242 1558-8424 2013 [Refereed][Not invited]
   

  In this study, long-term visibility data for the Pacific Ocean side of Hokkaido Island, northeast Japan, are investigated to clarify the relationship between interannual variation in summer fog frequency (FF) and largescale circulation patterns. At Kushiro, a significant FF decrease is found during 1931-2010 even without the influence of the observatory's relocation after 2000. In particular, since the late 1970s, a linear declining trend has accelerated, as evidenced by an increased number of years with very low FF in July and August. To clarify the climatological factor causing the summer FF declining trend at Kushiro, atmospheric vertical conditions in the planetary boundary layer and large-scale circulation are examined during 1989-2009 and 1958-2002, respectively, using available datasets. Composite analyses that are based on radiosonde observations reveal that the shallow fog layer is covered with a strong inversion layer during fog days whereas the inversion layer is absent during nonfog days. Composite circulation anomalies for the low-FF years at Kushiro show an intensified Okhotsk high (OH) pressure feature and southward shrinking of the North Pacific high (NPH) in July, in addition to the eastward displacement or shrinking of the NPH in August. These anomalous synoptic circulation patterns cause weakening in the southerly-southeasterly wind, which reduces sea-fog advection toward Kushiro and prevents the formation of stable stratification over the sea-fog layer. The authors suggest that the interannual variation in summer FF with the recent accelerated decline at Kushiro is primarily controlled by changes in the synoptic circulation associated with the OH and NPH development. © 2013 American Meteorological Society.
• 潜在作物生産性モデルGAEZの北海道での適用可能性の検討と改良

  田中朱美, 高橋潔, SHIN Yonghee, 増冨祐司, 山中康裕, 佐藤友徳

  地球環境研究論文集 20 I.237-I.248  2012/09/13 [Not refereed][Not invited]
  
• Potential impact of spatial patterns of future atmospheric warming on Asian dust emission

  Nobumitsu Tsunematsu, Hiroaki Kuze, Tomonori Sato, Masamitsu Hayasaki, Feifei Cui, Akihiko Kondoh

  ATMOSPHERIC ENVIRONMENT 45 (37) 6682 - 6695 1352-2310 2011/12 [Refereed][Not invited]
   

  Spatial patterns of future atmospheric warming presented by climate model projections indicate that the temperatures of the lower troposphere will increase markedly at high latitudes in the Northern Hemisphere and also the upper troposphere at low-middle latitudes. In this study, potential impacts of the spatial patterns of future atmospheric warming on Asian dust emission were investigated by performing numerical experiments using a dynamical downscaling method. After three significant Asian dust outbreak events were reproduced as control runs, initial and boundary conditions of the control runs were updated by adding differences in atmospheric variables between the future climate (2091-2100) and the recent climate (1991-2000) to execute pseudo global warming runs. The results showed that the dust emission fluxes in the main Asian dust sources (MADSs), i.e., the Taklimakan and Gobi deserts, decrease markedly in the future climate condition. The future decreases in the dust emission fluxes are likely to be caused by a combination of the relatively large increases in sea level pressures (SLPs) in MADSs and the small SLP changes to the north of MADSs, which reduces the meridional SLP gradients between the two areas and consequently weakens cold air outbreaks. The large SLP increases in MADSs may be due to a northward shift of storm tracks and increased atmospheric stabilities caused by the large upper-tropospheric warming at low-middle latitudes. The small SLP changes to the north of MADSs corresponded to the large increases in surface air temperatures, which would be influenced by the large lower-tropospheric warming at high latitudes. (C) 2011 Elsevier Ltd. All rights reserved.
• 気候変動に伴う北海道の雪質変化推定手法の開発

  中村一樹, 佐藤友徳, 山中康裕, 西村浩一

  寒地技術シンポジウム論文集 27 80 - 85 2011 [Not refereed][Not invited]
  
• Performance of Dynamic Downscaling for Extreme Weather Event in Eastern Mongolia: Case Study of Severe Windstorm on 26 May 2008

  Altangerel Batbold, Tomonori Sato, Mamoru Ishikawa, Jamba Tsogt

  SOLA 7 117 - 120 1349-6476 2011 [Refereed][Not invited]
   

  Global weather forecasts do not have sufficient performance to predict the local severe weather events that are accompanied with cyclones and cold fronts due to their coarse horizontal resolution. This study investigated the performance of dynamical downscaling (DD) using mesoscale model to simulate the severe windstorm in eastern Mongolia which occurred on 26-27 May 2008. Our results revealed that the DD experiments were successful in capturing the general features of the windstorm in terms of wind and temperature patterns. The timing and amplitude of drastic changes in the simulated temperature and wind speed were very similar to that observed than that obtained from the global atmospheric data, suggesting that DD is capable of predicting extreme wind storm events in Mongolia. Analyses on the nested domains indicate that the DD has crucial impact on the performance for simulating severe storm even with a moderate resolution (27 km), and further nesting (9 and 3 km) plays a role to improve it. Furthermore, the maximum wind speed approaches the observed value more closely as the horizontal resolution increases, although it still underestimates the observed wind speed even in the 3 km mesh domain. On the other hand, the abrupt temperature change is captured well even in the low-resolution domain, suggesting a difference in necessary horizontal resolution for temperature change and maximum wind speed.
• Verification of Downscaling Framework for Interannual Variation of Tropical Cyclone in Western North Pacific

  Tomonori Sato, Akira Juri, Kei Masuyama, Eiji Imakita, Masahide Kimoto

  SOLA 7 169 - 172 1349-6476 2011 [Refereed][Not invited]
   

  The downscaling framework, which is originally proposed by Emanuel et al. (2008), is modified to improve the interannual variation of the tropical cyclone features in Western North Pacific (WNP). The original framework, which utilizes axisymmetric model driven using monthly mean atmosphere and ocean variables, well reproduced interannual variation of tropical cyclone indices over North Atlantic while there is room for further improvement over WNP. The modified treatment of relative vorticity plays an essential role for improving interannual variation of genesis counts and power dissipation index in WNP. In this update, we introduced probability of cyclogenesis special to WNP which is a priori calculated using monthly mean 850-hPa level relative vorticity and best track. The result suggests that the monthly mean relative vorticity represents a potential of characteristic initiating disturbance in WNP such as monsoon trough and intraseasonal variation. Another experiment shows increased influence of vertical wind shear in middle troposphere improves the distribution of tropical cyclogenesis in WNP while it slightly deteriorates the interannual variation of genesis count.
• Snow/Ice and Cloud Responses to Future Climate Change around Hokkaido

  Shinji Matsumura, Tomonori Sato

  SOLA 7 205 - 208 1349-6476 2011 [Refereed][Not invited]
   

  Wintertime climate around Hokkaido is highly sensitive to fluctuations in snow and sea-ice. We examined future climate change in heavy snowfall region around Hokkaido, using the Pseudo-Global-Warming method (PGW) by a regional climate model. The boundary conditions of the PGW run were obtained by adding the difference between the future (2090s) and past (1990s) climates simulated by coupled general circulation models, into the 6-hourly reanalysis and daily sea surface temperature data. The PGW experiments show that snow depth decreases significantly over mountainous areas. However, snow cover decreases mainly over plain areas, which accelerates surface warming due to the decreased snow albedo. Despite the snow reductions, precipitation increases over the mountainous areas because of enhanced water vapor content. However, precipitation decreases over the Japan Sea and neighboring the coastal areas, suggesting a weakening of the convergent cloud band which is formed by convergence between cold northwesterly from the Eurasian continent and anticyclonic circulation over the Okhotsk Sea. Our results indicate the contrasting cloud responses to future climate change over the Japan and Okhotsk Seas in terms of meso-scale climate system.
• Diurnal Cycle of Precipitation in the Tropics Simulated in a Global Cloud-Resolving Model

  Sato, Tomonori, Miura, Hiroaki, Satoh, Masaki, Takayabu, Yukari N., Wang, Yuqing

  JOURNAL OF CLIMATE 22 (18) 4809 - 4826 0894-8755 2009/09 [Refereed][Not invited]
   

  This study analyzes the diurnal cycle of precipitation simulated in a global cloud-resolving model (GCRM) named the Nonhydrostatic Icosahedral Atmospheric Model (NICAM). A 30-day integration of NICAM successfully simulates the precipitation diurnal cycle associated with the land-sea breeze and the thermally induced topographic circulations as well as the horizontal propagation of diurnal cycle signals. The first harmonic of the diurnal cycle of precipitation in the 7-km run agrees well with that from satellite observations in its geographical distributions although its amplitude is slightly overestimated. The NICAM simulation revealed that the precipitation diurnal cycle over the Maritime Continent is strongly coupled with the land-sea breeze that controls the convergence/divergence pattern in the lower troposphere around the islands. The analysis also suggests that the cold pool often forms over the open ocean where the precipitation intensity is high, and the propagation of the cold pool events is related to the precipitation diurnal cycle as well as the land-sea breeze.Sensitivity experiments suggest a prominent horizontal resolution dependence of the simulated precipitation diurnal cycle. Over continental areas the 14-km run induces the diurnal peak about three hours later than the 7-km run. The 3.5-km run produces the peak time and amplitude that are very similar to those in Tropical Rainfall Measuring Mission (TRMM) precipitation radar (PR) observations. Meanwhile, the resolution dependence in phase and amplitude is negligibly small over the open oceans. This contrast sensitivity to the horizontal resolution is attributed to the differences in structure and life cycle of convective systems over land and ocean.Diurnal peaks of precipitable water vapor, precipitation, and outgoing long wave radiation (OLR) are compared over land areas using the NICAM 7-km run. The daily precipitable water vapor maximum appears around 1500 local time (LT), which is followed by the precipitation peak around 1630 LT. The diurnal cycle of high clouds tends to peak around 1930 LT, three hours later than the precipitation peak. These results from NICAM simulations can explain the cause of the phase differences among precipitation products based on several satellite observations. The authors demonstrate that the GCRM is a promising tool for realistically simulating the precipitation diurnal cycle and could be quite useful for studying the role of the diurnal cycle in the climate systems in a global context.
• Influences of subtropical jet and Tibetan Plateau on precipitation pattern in Asia: Insights from regional climate modeling

  Tomonori Sato

  QUATERNARY INTERNATIONAL 194 148 - 158 1040-6182 2009/02 [Refereed][Not invited]
   

  Large topographic features, like the Tibetan Plateau (TP) and the Rocky Mountains, have significant impacts on Earth's climate. Numerical experiments were carried out using a regional climate model in order to study the sensitivity of rainfall distribution to the TP's thermal/dynamic effects and meridional position of the subtropical westerly jet. The sensitivity experiments under the present winter conditions, characterized by weaker solar radiation and westerly jet located to the south of the TP, reveal that broad and climate characterizes Northeast Asia, covering North China and Mongolia. The results are consistent with previous studies, indicating that TP dynamic forcing is dominant in winter. In sensitivity experiments under present summer conditions, characterized by stronger solar radiation and the westerly jet located to the north of TP, a prominent subsidence occurred over North China, where the Taklimakan and Gobi deserts are located. In summer, dynamic forcing of TP is very weak, whereas the thermal forcing of TP mainly induces subsidence. Relatively smaller mountain ranges, such as the TianShan Mountains, also modify the atmospheric circulation even during the summer season. The active convection zone along the Baiu front, which produces an elongate rain belt that extends from East China to Korea and Japan, is near the boundary of two moisture sources, transported by the westerly wind over the Eurasian continent and by the Asian summer monsoon flow. The millennial-scale variation in the location of the boundary reflects corresponding changes in East Asian climate, including monsoon intensity, storm activity, and the subtropical jet. (C) 2008 Elsevier Ltd and INQUA. All rights reserved.
• Resolution Dependency of the Diurnal Cycle of Convective Clouds over the Tibetan Plateau in a Mesoscale Model

  Tomonori Sato, Takao Yoshikane, Masaki Satoh, Hiroaki Miltra, Hatsuki Fujinami

  JOURNAL OF THE METEOROLOGICAL SOCIETY OF JAPAN 86A 17 - 31 0026-1165 2008/11 [Refereed][Not invited]
   

  Sensitivity of precipitation diurnal cycle to the horizontal grid spacing was investigated using a mesoscale model without cumulus parameterization. Four numerical experiments with changing horizontal resolution are performed over one month with NCEP reanalysis boundary forcing. The studied range of grid spacing is from 3.5 km to 28 km which has been known as the intermediate scale to simulate mesoscale systems with/without cumulus parameterization. The target area is the Tibetan Plateau where pronounced diurnal cycle of convective systems is observed during the spring season. Lower resolution runs (14 and 28 km grid) show delayed formation and delayed mature stage of the cumulus convection in comparison to satellite observations. On the other hand, higher resolution runs (3.5 and 7 km grid) reproduce the proper development of the clouds after local noon which is consistent with observations. The total hydrometeor content and rainfall rate increase with grid size. Such systematic relationship of resolution dependencies are confirmed even in the monthly mean diurnal cycle, although most of previous studies examined only short periods. These results suggest that finer resolution at less than 7 kilometer is necessary to simulate realistic phase of the precipitation diurnal cycle over the Tibetan Plateau. The mechanism that is responsible for the resolution dependency is discussed. We suggest that the daytime convection which initially occurs due to unstable stratification over the Tibetan Plateau in spring tends to have a horizontal scale smaller than that is resolvable by the coarse resolution runs. ne delayed cloud formation induces larger downward shortwave radiation, which increases surface fluxes and results in too strong rainfall in the coarser resolution runs.
• Diurnal variation of convective activity and precipitable water around Ulaanbaator, Mongolia, and the impact of soil moisture on convective activity during nighttime

  Hiroyuki Iwasaki, Tomonori Sato, Tomoki Nii, Fujio Kimura, Kiyotaka Nakagawa, Ichirow Kaihotsu, Toshio Koike

  MONTHLY WEATHER REVIEW 136 (4) 1401 - 1415 0027-0644 2008/04 [Refereed][Not invited]
   

  The diurnal variations of convective activity and precipitable water were investigated using a C-band airport radar and GPS receivers around Ulaanbaator (UB), Mongolia; this location was considered as an example of an and region. The convective activity exhibited a pronounced diurnal cycle; it increased rapidly at 1100 local solar time (LST; 0300 UTC), reached the maximum at 1400 LST, and almost disappeared after 1900 LST. On the other hand, no diurnal variation of precipitable water could be observed, which implied that there was no considerable evapotranspiration, and the diurnal variation of the convective activity was irrelevant to the variation of water vapor. The reason why the deep convection could not develop at night is discussed using numerical modeling from the viewpoint of soil moisture. In the moist soil conditions assumed for humid simulations, an increase in the water vapor in the boundary layer due to evapotranspiration led to a potentially unstable condition that was sustained until night. Deep convection was formed at the southern foot of mountains where topographical convergence was expected. On the other hand, in the dry soil conditions assumed for the and simulations, deep convection did not occur during nighttime even though topographical convergence was expected over the southern foot of the mountains. These features of dry soil conditions were consistent with the results from radar observations around UB. In other words, since the soil around UB is too dry in practice to sustain an unstable condition until night, the deep convection had to decay by night and could not be initiated at night.
• A composite analysis of diurnal cycle of GPS precipitable water vapor in central Japan during Calm Summer Days

  G. Li, F. Kimura, T. Sato, D. Huang

  THEORETICAL AND APPLIED CLIMATOLOGY 92 (1-2) 15 - 29 0177-798X 2008/03 [Refereed][Not invited]
   

  The diurnal variations of water vapor in central Japan were investigated with GPS-derived precipitable water (PWV) and surface meteorological data as classified to three kinds of locations. Twenty-five clear days in central Japan in August 2000 were investigated to clarify the role of water vapor in the nocturnal maximum in the diurnal cycle of convective rainfall. The diurnal variations of PWV and some meteorological factors were composite during the selected days at 6 stations. The PWV shows a clear diurnal cycle with the amplitude of 3.4mm to 8.8mm and changes little during the period from the morning to noon. The daily amplitude of PWV is the largest in basin and smallest in plain although mean of PWV keeps high value in plain. A typical feature of the diurnal variation in central Japan is a maximum appearing in the evening. The time of maximum is from 1800 LST to 2000 LST, and minima appears at noon nearly in mountainous area and basin, while in early morning in plain. The diurnal maximum of PWV appears earlier in mountainous region than in plain. A diurnal cycle of specific humidity can be observed in all locations, and the amplitude in mountainous region is especially large compared with that in basin and plain. It is important to notice that there are remarkable differences in specific humidity among the six stations. The results suggest that the diurnal variation of PWV seems to be strongly affected by the local thermal circulations generated by the topography around these stations. The moisture transport causes the differences in phase of the diurnal cycle of PWV between different locations as well as the phase difference in precipitation. A very clear diurnal variation in surface air temperature is similar to that of solar radiation, with a minimum in the morning and a maximum in early afternoon. Maximum of surface wind speed are corresponded to peak of precipitation very well. It can be concluded that the amplitude of solar radiation increases with altitude as opposed to the situation of PWV generally. The precipitation observed frequently in the evening also shows a similar diurnal variation to that of the PWV, indicating the peak of precipitation appearing in late afternoon or in the evening over central Japan. Meanwhile the PWV reaches its nocturnal maximum. There is a good relationship between the diurnal cycle of observed precipitation and that of the PWV.
• Holocene moisture evolution in arid central Asia and its out-of-phase relationship with Asian monsoon history

  Fahu Chen, Zicheng Yu, Meilin Yang, Emi Ito, Sumin Wang, David B. Madsen, Xiaozhong Huang, Yan Zhao, Tomonori Sato, H. John B. Birks, Ian Boomer, Jianhui Chen, Chengbang An, Bernd Wuennemann

  QUATERNARY SCIENCE REVIEWS 27 (3-4) 351 - 364 0277-3791 2008/02 [Refereed][Not invited]
   

  We synthesize palaeoclimate records from the mid-latitude arid Asian region dominated today by the Westerlies ("arid central Asia" (ACA)) to evaluate spatial and temporal patterns of moisture changes during the Holocene. Sediment records from I I takes with reliable chronologies and robust proxies were selected to reconstruct moisture histories based on a five-class ordinal wetness index with assigned scores from the driest to wettest periods at individual sites for 200-year time slices. The proxies used in these records include pollen and diatom assemblages, sediment lithology, lake levels, and geochemistry (mainly isotope) data. The results of our synthesis show that ACA as a whole experienced synchronous and coherent moisture changes during the Holocene, namely a dry early Holocene, a wetter (less dry) early to mid-Holocene, and a moderately wet late Holocene. During the early Holocene most of the lakes experienced very low water levels and even dried out before ca 8 ka (1 ka = 1000cal a BP). Hence the effective-moisture history in ACA is out-of-phase with that in monsoonal Asia as documented by numerous palaeoclimate records. In monsoonal Asia, a strong summer monsoon and humid climate characterized the early Holocene, and a weakened summer monsoon and drier climate prevailed during the late Holocene, which were mainly controlled by changes in low-latitude summer insolation. In contrast, we propose that the pattern of Holocene effective-moisture evolution in the westerly dominated ACA was mainly determined by North Atlantic sea-surface temperatures (SSTs) and high-latitude air temperatures that affect the availability, amount and transport of water vapor. Also, topography of the Tibetan Plateau and adjacent Asian highlands could have contributed to the intensification of dry climate in ACA during the early Holocene, as a result of strengthening the subsidence of dry air masses, associated with stronger uplift motion on the plateau by intense heating under a stronger summer insolation. Summer insolation might have played a key role in directly controlling moisture conditions in ACA but only after the northern hemisphere ice-sheets had disappeared in the mid- and late Holocene. (C) 2007 Elsevier Ltd. All rights reserved.
• Impact of extensive irrigation on the formation of cumulus clouds

  Hiroaki Kawase, Takao Yoshikane, Masayuki Hara, Fujio Kimura, Tomonori Sato, Shingo Ohsawa

  GEOPHYSICAL RESEARCH LETTERS 35 (1) 6  0094-8276 2008/01 [Refereed][Not invited]
   

  Irrigated farmland in an arid region creates a prominent heat contrast along its boundary. A statistical analysis of satellite images indicated that the frequency distribution of clouds has a clear contrast between the Hetao Irrigation District in China and the surrounding dry area in the summer. In this paper, we use a mesoscale model to clarify the impact of the extensive irrigation on the cloud formation. The numerical experiment assuming simplified irrigation indicates that the colder surface of the irrigated area induces a surface wind toward the dry area, where the surface temperature is higher. This wind is a part of a land-use-induced circulation. The circulation matures in the early afternoon and generates clouds near the border of the dry area and irrigated area.
• Vegetation and topographic control of cloud activity over arid/semiarid Asia

  Tomonori Sato, Fujio Kimura, Akira S. Hasegawa

  JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 112 (D24) 2169-897X 2007/12 [Refereed][Not invited]
   

  [1] Cloud patterns over arid/semi-arid area in the Northeast Asia are investigated by statistical analysis of the satellite observations in relation to the roles of topography and vegetation contrasts. In the morning, cloud frequencies are high over the mountainous areas in the northern Mongolia. In the afternoon and early evening, the frequencies increase in the entire analyzed domain. The frequencies are prominently enhanced over the slopes and mountains. The upslope wind prevails during the daytime where vegetation contrasts are not sharp or the slope is steep, even though vegetation covers the mountain which tends to cool the mountain slope. The land- cover- induced cloud formations are distinctly observed where the slope is gentle and vegetation contrast is sharp enough to form a prominent surface temperature contrast. Around the Yellow River, the cloud frequency rapidly increases in the afternoon due to the vegetation contrast, whereas it remains very low over the river. We hypothesized that the smaller sensible heat flux from the vegetated surface suppresses the development of the daytime mixed layer. Thus the cumulus clouds near top of the mixed layer are difficult to form. It is inferred from the statistical analysis that the afforestation of the desertified lands may cause the decrease of cloud frequency above it.
• Water sources in semiarid northeast Asia as revealed by field observations and isotope transport model

  Tomonori Sato, Maki Tsujimura, Tsutomu Yamanaka, Hiroyuki Iwasaki, Atsuko Sugimoto, Michiaki Sugita, Fujio Kimura, Gombo Davaa, Dambaravjaa Oyunbaatar

  Journal of Geophysical Research Atmospheres 112 (17) D17112?D17112-13  0148-0227 2007/09/16 [Refereed][Not invited]
   

  Origin of water vapor, which falls as precipitation over arid/semiarid area in northeast Asia, is investigated by modeling and observational approaches. The regional climate model evaluates the spatiotemporal variations of precipitation and water vapor budget, which are used to drive the single-layer isotope circulation model. Intraseasonal variations of δ< sup> 18< /sup> O in precipitation are well simulated during June-July-August of 2003. The δ< sup> 18< /sup> O in water vapor experiences rapid decreases according to the passage of synoptic-scale disturbances. The rapid decreases of δ< sup> 18< /sup> O are attributed to two processes. (1) The δ< sup> 18< /sup> O in air mass locally decreases over the western mountains associated with the mountain precipitation the light vapor is advected to eastern Mongolia by the prevailing westerly wind. (2) Convective systems pass by in the vicinity of the observation site, which persistently keep the lower δ< sup> 18< /sup> O in the air mass. Origin of the water vapor during June-July-August in 2003 is evaluated by the colored moisture analysis in which the tracers are assigned depending on the region where the water vapor finally evaporated. Seasonal mean result indicates that the regions contributing to precipitation in Mongolia are not low-latitude regions but central Asia and western Siberia located to the northwest of Mongolia. Observed multilevel isotopic composition supports the model estimation. The moisture transport along the southwesterly wind of the Asian summer monsoon has difficulty reaching Mongolia as a monthly/seasonal mean perspective. However, eastern Mongolia and northeast China are situated on the border area between westerly wind moisture transport (by midlatitude synoptic cyclones) and southerly wind moisture transport (by Asian summer monsoon). Copyright 2007 by the American Geophysical Union.
• Spring diurnal cycle of clouds over Tibetan Plateau: Global cloud-resolving simulations and satellite observations

  Sato, Tomonori, Miura, Hiroaki, Satoh, Masaki

  GEOPHYSICAL RESEARCH LETTERS 34 (18) 6  0094-8276 2007/09 [Refereed][Not invited]
   

  Thermal forcing of the Tibetan Plateau (TP) has large impacts on the Asian summer monsoon. In this study, we statistically analyzed the outputs from the global cloud- resolving model, NICAM (Nonhydrostatic ICosahedral Atmospheric Model). In order to investigate the convective activities, two brightness temperature datasets were compared, one derived from the satellite observation and another derived from the model. The model well simulated the spatio- temporal variations of convective clouds in April 2004. The diurnal cycle of clouds was better represented in NICAM, which shows only few- hour phase difference, than that in the reanalysis data. Three experiments changing horizontal resolution revealed that the higher resolution run conducts better representation of the diurnal cycle, especially on the nighttime disappearance of the high clouds. These results indicate that the global cloud- resolving model will improve the seasonal prediction of the Asian summer monsoon through better description on the thermal forcing of the Tibetan Plateau.
• Water sources in semiarid northeast Asia as revealed by field observations and isotope transport model

  Tomonori Sato, Maki Tsujimura, Tsutomu Yamanaka, Hiroyuki Iwasaki, Atsuko Sugimoto, Michiaki Sugita, Fujio Kimura, Gombo Davaa, Dambaravjaa Oyunbaatar

  JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 112 (D17) 2169-897X 2007/09 [Refereed][Not invited]
   

  Origin of water vapor, which falls as precipitation over arid/ semiarid area in northeast Asia, is investigated by modeling and observational approaches. The regional climate model evaluates the spatiotemporal variations of precipitation and water vapor budget, which are used to drive the single- layer isotope circulation model. Intraseasonal variations of delta(18) O in precipitation are well simulated during June- July- August of 2003. The delta(18) O in water vapor experiences rapid decreases according to the passage of synoptic- scale disturbances. The rapid decreases of delta(18) O are attributed to two processes. ( 1) The delta(18) O in air mass locally decreases over the western mountains associated with the mountain precipitation; the light vapor is advected to eastern Mongolia by the prevailing westerly wind. ( 2) Convective systems pass by in the vicinity of the observation site, which persistently keep the lower delta(18) O in the air mass. Origin of the water vapor during June-July- August in 2003 is evaluated by the colored moisture analysis in which the tracers are assigned depending on the region where the water vapor finally evaporated. Seasonal mean result indicates that the regions contributing to precipitation in Mongolia are not low- latitude regions but central Asia and western Siberia located to the northwest of Mongolia. Observed multilevel isotopic composition supports the model estimation. The moisture transport along the southwesterly wind of the Asian summer monsoon has difficulty reaching Mongolia as a monthly/ seasonal mean perspective. However, eastern Mongolia and northeast China are situated on the border area between westerly wind moisture transport ( by midlatitude synoptic cyclones) and southerly wind moisture transport ( by Asian summer monsoon).
• How does the Tibetan Plateau affect the transition of Indian monsoon rainfall?

  Tomonori Sato, Fujio Kimura

  MONTHLY WEATHER REVIEW 135 (5) 2006 - 2015 0027-0644 2007/05 [Refereed][Not invited]
   

  The roles of the Tibetan Plateau (TP) upon the transition of precipitation in the south Asian summer monsoon are investigated using a simplified regional climate model. Before the onset of the south Asian monsoon, descending flow in the midtroposphere, which can be considered as a suppressor against precipitation, prevails over northern India as revealed by the NCEP-NCAR reanalysis data. The descending motion gradually weakens and retreats from this region before July, consistent with the northwestward migration of the monsoon rainfall. To examine a hypothesis that the dynamical and thermal effects of TP cause the midtropospheric subsidence and its seasonal variation, a series of numerical experiments are conducted using a simplified regional climate model. The mechanical effect of the TP generates robust descending flow over northern India during winter and spring when the zonal westerly flow is relatively strong, but the effect becomes weaker after April as the westerly flow tends to be weaker. The thermal effect of the TP, contrastingly, enhances the descending flow over north India in the premonsoonal season. The descending flow enhanced by the thermal effect of the TP has a seasonal cycle because the global-scale upper-level westerly changes the energy propagation of the thermal forcing response. The subsidence formed by the mechanical and thermal effects of the TP disappears over northern India after the subtropical westerly shifts north of the plateau, the seasonal change of which is in good agreement with that in the reanalysis data. The retreat of the descending flow can be regarded as the withdrawal of the premonsoon season and the commencement of the south Asian monsoon. After that, the deep convection, indicating the onset of the Indian summer monsoon, is able to develop over north India in relation to the ocean atmosphere and land-atmosphere interaction processes. Northwest India is known to be the latest region of summer monsoon onset in south Asia. Thus, the thermal and mechanical forcing of the TP has great impact on the transition of the Indian monsoon rainfall by changing the midtropospheric circulation.
• Projection of global warming onto regional precipitation over Mongolia using a regional climate model

  Tomonori Sato, Fujio Kimura, Akio Kitoh

  JOURNAL OF HYDROLOGY 333 (1) 144 - 154 0022-1694 2007/01 [Refereed][Not invited]
   

  Climate change due to global warming is of concern to the public and may cause significant changes in the hydrological regimes in arid/semi-arid areas including Mongolia, which locates at a boundary between and and humid regions. However, general circulation models (GCMs) are not sufficient to evaluate climate change on a regional-scale. In this study, two kinds of dynamical downscaling (DDS), referred to as method-G and method-R, using a regional climate model (RCM) are applied to investigate the rainfall change over Mongolia in July due to the global warming. Method-G is a traditional DDS method in which an RCM is directly nested within a GCM, while method-R is newly suggested in this study and aims to improve the reproductivity of a regional climate. For current climate simulation, method-R uses reanalysis data as a boundary forcing of the RCM while a specialty created boundary condition, in which projected changes of meteorological variables in a GCM simulation are added on reanalysis data, is used for global warming simulation. Compared with in situ observations, the rainfall amount for July is very well reproduced by the RCM, even in a smatter area of four subregions in Mongolia. Rainfall intensity by method-R is very close to actual observations; on the other hand, method-G fails to simulate heavy rainfall events stronger than 16 mm day(-1). The two DDS methods show similar results with respect to the changes of precipitation in July due to the global warming, which are that precipitation decreases over northern and increases over southern Mongolia. In method-R, a decrease of precipitation of middle to heavy rainfall intensity, stronger than 4 mm day', contributes largely to the decreased July precipitation in northern Mongolia. Soil moisture over Mongolia also tends to decrease in July because of the combined effect caused by the decrease of precipitation and the increase of potential evaporation due to rising air temperature. This situation indicates that severe droughts may occur more frequently from the effects of global warming. (c) 2006 Elsevier B.V. All rights reserved.
• Precipitable Water Vapor around Orographically Induced Convergence Line

  Hiroaki Kawase, Yoshitaka Takeuchi, Tomonori Sato, Fujio Kimura

  SOLA 2 25 - 28 1349-6476 2006 [Not refereed][Not invited]
   

  During the winter monsoon, a convergence line called the Boso Front often appears in the area between the Kanto Plain and the Izu Islands, Japan. Two typical cases of high-level Precipitable Water Vapor (PWV) are observed along the convergence line in the lee of Chubu Mountains by the aid of latest techniques of Global Positioning System (GPS). Statistic analysis of GPS derived Precipitable Water Vapor (GPS-PWV) indicates that the prevailing wind direction controls the position of the high-level PWV in the lee of Chubu Mountains. A numerical model simulates the behavior of water vapor, namely, the temporal variation of simulated PWV and surface wind, which suggest the reasons for the high PWV near the convergence line. The convergence of surface wind gathers moisture, and trapped moisture by reduced wind velocity may also contribute the high-level PWV.
• 東京都市域における夏季の降水システムの強化

  佐藤友徳, 寺島司, 井上忠雄, 木村富士男

  天気 53 479 - 484 2006 [Not refereed][Not invited]
  
• Extensive dust outbreaks following the morning inversion breakup in the Taklimakan Desert

  N Tsunematsu, T Sato, F Kimura, K Kai, Y Kurosaki, T Nagai, HF Zhou, M Mikami

  JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 110 (D21) 12  2169-897X 2005/11 [Refereed][Not invited]
   

  [1] Extensive dust outbreaks occurred on the late morning of 26 March 2004 in the Taklimakan Desert. An image by the satellite AQUA shows the dust outbreaks as an enormous dust storm extending as far as 1000 km in the direction of east and west across the desert. A ground-based lidar was successful in observing the dust storm. Values of the backscattering ratio from near the ground surface to an altitude of 6 km above sea level rapidly increased as soon as the dust storm covered the lidar observation site. Numerical experiments including a diffusion experiment revealed that strong westerly winds appeared at the surface level following the morning inversion breakup and then induced the dust outbreaks. The nocturnal inversion layer prevented the strong westerly winds from spreading to the surface level until the breakup. Notable nocturnal inversion is considered to be easily formed in the Taklimakan Desert because of its deep basin topography which can accumulate cold air masses. These results show the stability of the planetary boundary layer to be an extremely important factor in dust outbreaks especially in basin deserts, in addition to the intensity of surface winds. This implies that the occurrence frequency of dust storms in the desert has a diurnal cycle.
• Diurnal cycle of convective instability around the central mountains in Japan during the warm season

  T Sato, F Kimura

  JOURNAL OF THE ATMOSPHERIC SCIENCES 62 (5) 1626 - 1636 0022-4928 2005/05 [Refereed][Not invited]
   

  Convective rainfall often shows a clear diurnal cycle. The nighttime peak of convective activity prevails in various regions near the world's mountains. The influence of the water vapor and convective instability upon nocturnal precipitation is investigated using a numerical model and observed data. Recent developments in GPS meteorology allow the estimation of precipitable water vapor (PWV) with a high temporal resolution. A dense network has been established in Japan. The GPS analysis in August 2000 provides the following results: In the early evening, a high-GPS-PWV region forms over mountainous areas because of the convergence of low-level moisture, which gradually propagates toward the adjacent plain before midnight. A region of convection propagates simultaneously eastward into the plain. The precipitating frequency correlates fairly well with the GPS-PWV and attains a maximum value at night over the plain. The model also provides similar characteristics in the diurnal cycles of rainfall and high PWV. Abundant moisture accumulates over the mountainous areas in the afternoon and then advects continuously toward the plain by the ambient wind. The specific humidity greatly increases at about the 800-hPa level over the plain at night, and the PWV reaches its nocturnal maximum. The increase in the specific humidity causes an increase of equivalent potential temperature at about the 800-hPa level: as a result. the convective instability index becomes more unstable over the plain at night. These findings are consistent with the diurnal cycle of the observed precipitating frequency.
• Dust storms generated by mesoscale cold fronts in the Tarim Basin, Northwest China

  Aoki, I, Y Kurosaki, R Osada, T Sato, F Kimura

  GEOPHYSICAL RESEARCH LETTERS 32 (6) 4  0094-8276 2005/03 [Refereed][Not invited]
   

  By the numerical experiments, we clarify the regional wind systems that generate dust storms in the Tarim basin, Northwest China. In the basin, dust storms are generated by a mesoscale cold wind system induced by a synoptic-scale cold air mass behind a cold front. The intruding course of the mesoscale cold wind into the basin can be classified into three patterns. The first pattern is characterized by the easterly mesoscale cold wind, which is separated from the synoptic- scale cold westerly and turns westward after going around the eastern side of the TianShan Mountains. The mesoscale cold wind categorized in the second pattern directly crosses over the TianShan Mountains, which often gives a very strong wind in the basin with the largest dust storms in the three patterns. The third pattern indicates that the cold wind crosses over Pamir plateau, although the magnitude of the dust storm is usually small.
• Impact of diabatic heating over the Tibetan Plateau on subsidence over northeast Asian arid region

  T Sato

  GEOPHYSICAL RESEARCH LETTERS 32 (5) L05809.1-L05809.5  0094-8276 2005/03 [Refereed][Not invited]
   

  [1] The formation mechanism of the arid climate over northeast Asia is investigated by a series of regional climate model experiments. Precipitation there is suppressed by a prominent regional-scale subsidence during summertime. An experiment without diabatic heating shows very gentle vertical motion there, whereas the subsidence is prominent when diabatic heating by solar radiation is included in the model. Additionally, the other experiments indicate that an artificial heating over the Tibetan Plateau enhances the subsidence over the arid area which is similar to the observed distribution. These results suggest that the thermal effects of the plateau induce the prominent subsidence. The mechanical effects of the topography, such as stationary mountain waves, are not a principal reason for the subsidence nor the arid climate. The stationary Rossby wave driven by the diabatic heating over the plateau tends to propagate northward during boreal summer, since subtropical westerly jet locates north of the plateau.
• Dust storms generated by mesoscale cold fronts in the Tarim Basin, Northwest China

  Aoki, I, Y Kurosaki, R Osada, T Sato, F Kimura

  GEOPHYSICAL RESEARCH LETTERS 32 (6) 4  0094-8276 2005/03 [Refereed][Not invited]
   

  By the numerical experiments, we clarify the regional wind systems that generate dust storms in the Tarim basin, Northwest China. In the basin, dust storms are generated by a mesoscale cold wind system induced by a synoptic-scale cold air mass behind a cold front. The intruding course of the mesoscale cold wind into the basin can be classified into three patterns. The first pattern is characterized by the easterly mesoscale cold wind, which is separated from the synoptic- scale cold westerly and turns westward after going around the eastern side of the TianShan Mountains. The mesoscale cold wind categorized in the second pattern directly crosses over the TianShan Mountains, which often gives a very strong wind in the basin with the largest dust storms in the three patterns. The third pattern indicates that the cold wind crosses over Pamir plateau, although the magnitude of the dust storm is usually small.
• The TianShan Rain-shadow Influence on the Arid Climate Formation in Northwestern China

  Tomonori Sato

  SOLA 1 13 - 16 1349-6476 2005 [Not refereed][Not invited]
   

  The role of mountain ranges upon the arid climate formation in northwestern China is investigated using regional climate model. Two kinds of numerical experiments are carried out with real topography and with modified topography which does not contain the TianShan Mountains. Simulated rainfall distribution with real topography shows maximum precipitation in upwind slope of the mountain and minimum precipitation in downwind side of it, which coincides with the features of rain-shadow in other regions of the world. However, numerical experiment without the TianShan Mountains also simulates the area of distinct minimum precipitation in the same location. The arid climate, therefore, is formed even though the rain shadow effect is absent. The difference in rainfall amount between these two experiments is very small around downwind arid region. On the other hand, more intense and frequent rainfall events tend to occur in upwind of the mountain range due to forced lifting of environmental flow, which just emphasizes the precipitation contrast between upwind and downwind side of the mountain. The precipitation accompanied with the synoptic scale disturbances is suppressed over the arid region whether the TianShan Mountains exist or not.
• Characteristics of Cloud Streets in the Pacific Ocean along Japan Islands under the Winter Monsoon Condition

  Kawase Hiroaki, Sato Tomonori, Kimura Fujio

  GEOPHYSICAL RESEARCH LETTERS 32 (3) 147 - 159 2005 [Refereed][Not invited]
  
• A funnel cloud and downburst over Mongolia on 2 July 2003

  SATO Tomonori

  Tenki 社団法人日本気象学会 51 (3) 161 - 162 0546-0921 2004/03/31 [Not refereed][Not invited]
  
• A two-dimensional numerical study on diurnal cycle of mountain lee precipitation

  T Sato, F Kimura

  JOURNAL OF THE ATMOSPHERIC SCIENCES 60 (16) 1992 - 2003 0022-4928 2003/08 [Refereed][Not invited]
   

  Simple numerical experiments using a two-dimensional model were conducted to investigate the diurnal variation of water vapor in the lee of a mountain range, which strongly affects nighttime precipitation. In the daytime, moisture increases around the convergence zone in the lee of the mountain were formed by thermally induced local circulations in moderate ambient wind. Then, a region of enhanced precipitable water vapor (PWV) was formed. The region of enhanced PWV was transported to the lee side of the mountain by the ambient wind and finally reached the plain during the night. The convective instability in the lower troposphere and the possibility of deep convection were controlled by the advection of water vapor in the lee of the mountain, especially by the position of the enhanced PWV region. As a result, the diurnal cycle of the convective instability showed a phase difference between the mountainous region and the plain. The profile of equivalent potential temperature tended to be unstable in the lee of the mountain at night and contributed to the production of nighttime precipitation. The propagation speed of the enhanced PWV region was roughly determined by the ambient wind speed. Some sensitivity experiments using bulk microphysics have suggested that the propagation speed of the enhanced PWV region is insensitive to the occurrence of a deep convection. The enhanced PWV region generated over a wider mountain range tends to travel farther, retaining its magnitude even until night. The water vapor transport process presented in this study agrees well with the actual diurnal variations of rainfall observed in many regions over land.

Books etc

• ロシア文化事典

  沼野充義, 望月哲男, 池田嘉郎編集, 佐藤友徳他 (Joint work気候・気象)
  丸善出版 2019
• 日本気候百科

  佐藤 友徳 (Contributor北海道の気候)
  丸善出版 2018/01
• Global cloud/cloud-resolving models and the Madden-Julian Oscillation

  Miyakawa, T, T. Sato 
  World Scientific Publishing 2016 385 173-184
• 北半球寒冷圏陸域の気候・環境変動

  飯島慈裕, 佐藤友徳 (Editor)
  2014/10
• 高緯度における大気−陸面相互作用

  佐藤友徳 
  2014 178-195
• Cloud-cluster-resolving global atmospheric modeling -A Challenge for the new age of tropical meteorology

  Matsuno, T, M. Satoh, H. Tomita, T. Nasuno, S.-I. Iga, A. T. Noda, K. Oouchi, T. Sato, W. Yanase, H. Miura, H. Fudeyasu 
  World Scientific Publishing Co. 2011 455-473

Conference Activities & Talks

• ユーラシア大陸における夏季気温偏差場の予測可能性に対する陸面の寄与  [Not invited]

  佐藤友徳, 中村哲

  日本気象学会2018年春季大会  2018/05
• Investigating a possible contribution of land surface processes on extreme hot event in Northeast Eurasia in recent summer  [Not invited]

  Sato, T, E. Erdenebat, T. Nakamura

  8th GEWEX Open Science Conference  2018/05
• アンサンブル気候予測データを用いた日本周辺における月降水量極端事象の将来変化  [Not invited]

  初塚大輔, 佐藤友徳

  日本気象学会2017年秋季大会  2017/10
• 北東ユーラシアにおける大気-陸面相互作用−特に暖候期の水循環に関連して−  [Not invited]

  佐藤友徳

  日本気象学会2017年秋季大会(統合的陸域圏研究連絡会)  2017/10
• アンサンブル気候予測データを用いた日本周辺における台風通過頻度の将来変化に関する要因解析  [Not invited]

  松下侑未, 佐藤友徳

  日本気象学会2017年秋季大会  2017/10
• 北海道西岸沖で発生する小低気圧に対する海氷および山岳の効果  [Not invited]

  佐藤友徳, 田村健太

  雪氷研究大会2017  2017/09
• How strongly is polar low genesis around North Japan influenced by Earth surface forcings?  [Not invited]

  Sato T, K. Tamura

  2016 AGU Fall meeting  2016/12
• 過去の地域気候変化に対する下部境界条件の寄与  [Invited]

  佐藤友徳, 田村健太, 中村誠吾, 杉本志織

  メソ気象研究会  2016/10
• Diurnal variation of precipitation around the Meghalaya Plateau during the break phase of sub-monthly intraseasonal oscillation  [Not invited]

  Sato, T, and T, Ichigi

  International workshop on land surface multi-spheres processes of Tibetan Plateau  2016/08
• Role of snow cover on urban heat island intensity investigated by urban canopy model with snow effects  [Not invited]

  Tomonori Sato, Keisuke Mori

  AGU Fall meeting 2015  2015/12
• Seasonally and diurnally different response of surface air temperature to historical urbanization in Sapporo, North Japan  [Not invited]

  Sato, T, S. Sugimoto, T. Sasaki

  AGU fall meeting 2014  2015/12
• 東京に降雪をもたらす低気圧の経路と黒潮流路変動の関係についての統計解析  [Not invited]

  天澤俊行, 佐藤友徳

  日本気象学会2015年春季大会  2015/05
• マルチGCM×マルチRAMの気候データを用いたてん菜糖量の将来変化予測  [Not invited]

  友貞俊成, 佐藤友徳

  日本農業気象学会全国大会  2015/03
• Coherent variability between diurnal cycle and intraseasonal oscillation in orographic precipitation around the Meghalaya Plateau  [Not invited]

  Sato, T

  7th International Scientific Conference on the Global Water and Energy Cycle (GEWEX）  2014
• A modeling study on the role of local SST warming on the precipitation trends observed in north Japan during winter monsoon  [Not invited]

  Sato, T, S. Sugimoto

  AGU Fall meeting 2013  2013/12
• 日本海海面水温の上昇と冬季降水量の長期変化傾向について  [Not invited]

  佐藤友徳, 杉本志織

  日本気象学会2013年秋季大会  2013/11
• Possible impact of sea surface warming on the spatial variation of winter precipitation trends in north Japan  [Not invited]

  Sato, T, S. Sugimoto

  Davos Atmosphere and Cryosphere Assembly DACA-13  2013/07
• 季節内振動によるメガラヤの降水極大と日変化  [Not invited]

  佐藤友徳

  日本気象学会2013年春季大会  2013/05
• 地域スケールの気候予測情報とその活用  [Not invited]

  佐藤友徳

  日本気象学会2012年秋季大会一般公開シンポジウム「気象学が地域の未来にいかに貢献できるか？これからの北海道の地域づくりと気象学の研究」  2012/10
• Assessment of dynamical downscale ability to simulate intra-seasonal and interannual variation in East Asia  [Not invited]

  Sato, T, Y. Xue

  AMS 2011annual meeting  2011
• Assessment of dynamical downscale ability to simulate intra-seasonal variation in China and Mongolia  [Not invited]

  Sato, T, Y. Xue

  10th International Regional Spectral Model Workshop  2010/08
• 熱帯低気圧の気候変動に伴う変化 -低解像度環境場からの推定-  [Not invited]

  重里 昌, 増山 啓, 佐藤 友徳, 三浦 裕亮, 末吉 哲雄, 木本 昌秀

  日本気象学会2010年秋季大会  2010
• 中国東部およびモンゴルにおける地域気候モデルの降水再現性の検証  [Not invited]

  佐藤友徳, Y. Xue

  日本気象学会2010年秋季大会  2010
• Influences of global warming and local processes on warm season climate in Mongolia  [Not invited]

  Sato, T, F. Kimura

  MOCA-09 (IAMAS/IAPSO/IACS Joint Assembly)  2009/07
• Role of cold pool formation on the diurnal cycle of precipitation over the maritime continent  [Not invited]

  Sato, T, H. Miura, M. Satoh, Y. N. Takayabu

  International MAHASRI/HyARC workshop on Asian monsoon and Water cycle  2009/03
• 北東アジアにおける夏季の降水起源の年々変動について  [Not invited]

  佐藤友徳

  日本気象学会2009年秋季大会  2009
• 地球温暖化による黄砂発生ポテンシャル変化の検証  [Not invited]

  佐藤友徳, 木本昌秀

  日本気象学会2008年春季大会  2008
• 全球雲解像モデルNICAMによる熱帯域の降水日変化と解像度依存性  [Not invited]

  佐藤友徳, 三浦裕亮, 佐藤正樹, 高藪縁

  日本気象学会2008年春季大会  2008
• Diurnal convective activity over Tibetan plateau in the global cloud-resolving model, NICAM  [Not invited]

  Sato, T, H. Miura, M. Satoh

  XXIV IUGG General Assembly  2007
• 関東地方南部における降水系の強化と都市の関係  [Not invited]

  佐藤友徳, 寺島司, 井上忠雄, 木村富士男

  日本気象学会2006年春季大会  2006
• Numerical study on the arid climate formation in middle latitude Asia  [Invited]

  Sato, T

  RACHAD 2006 workshop  2006
• Role of mountains on the formation of the arid climate in northwestern China  [Not invited]

  Sato, T, F. Kimura

  IAMAS 2005 scientific assembly  2005
• Diurnal cycle of precipitable water vapor and convective instability around the central mountains in Japan during August 2000  [Not invited]

  Sato, T, F. Kimura

  IAMAS 2005 scientific assembly  2005
• 領域気候モデルを用いたモンゴル東部における大気水収支解析  [Not invited]

  佐藤友徳, 辻村真貴, 木村富士男, 佐々木リサ, 杉本敦子, 山中勤

  地球惑星科学関連学会2004年合同大会  2004
• 一般風と山谷風による水蒸気輸送の２次元数値シミュレーション  [Not invited]

  佐藤友徳, 木村富士男

  2001年日本気象学会春季大会  2001

MISC

• 第48回メソ気象研究会・気象災害委員会研究会の報告

  佐藤友徳, 山田朋人, 金田幸恵, 横井覚, 筆保弘徳, 時岡真治  天気  65-  591  -595  2018  [Refereed][Not invited]
  
• 別寒辺牛湿原泥炭コアのミズゴケセルロース酸素同位体比を用いた過去2000年間の古気候復元

  櫻井弘道, 山本正伸, 関宰, 大森貴之, 佐藤友徳  日本地球惑星科学連合大会予稿集(Web)  2018-  ROMBUNNO.MIS01‐P06 (WEB ONLY)  2018  [Not refereed][Not invited]
  
• Meteorological measurements in winter at mountain area in Hokkaido

  下山宏, 佐藤友徳, 山口悟, 渡辺力  雪氷研究大会講演要旨集(Web)  2018-  193(J‐STAGE)  2018  [Not refereed][Not invited]
  
• Implementation of North-eastern Eurasia PMM Terrestrial UNited validation Experiment (NEPTUNE)

  GOMBOLUUDEV Purevjav, OYUNBAATAR Dambaravjaa, IIJIMA Yoshihiro, AIDA Kentaro, ASANUMA Jun, ISHIKAWA Mamoru, IWASAKI Hiroyuki, OHTA Takeshi, KOTANI Ayumi, SATO Tomonori, SHINODA Masato, SUGIURA Konosuke, PARK Hotaek, HIYAMA Tetsuya, HIRASAWA Naohiko, KANEKO Yuki, HORI Masahiro  三重大学大学院生物資源学研究科紀要  (43)  15  -25  2017/09  [Not refereed][Not invited]
   

  A core observatory satellite of the Global Precipitation Measurement (GPM) has been launched by the Japan Aerospace Exploration Agency (JAXA) in February 2014. The satellite can newly observe both liquid and solid precipitation in the high latitude region. Verification of this data is indispensable for improving observation accuracy toward utilization for hydrological cycle and water resource researches in the land area of cold region. This research project "NEPTUNE" aims for comprehensive validation of summer precipitation (rain), winter precipitation (snow fall) and their spatial distribution based on ground truth data obtained by our observation network which we will improve in Northeast Eurasia (Hokkaido, Mongolia and East Siberia), and combining other satellite data analyses. In addition, the project extends to clarify possibilities of GPM data for future applied research using modelling techniques of land surface processes, distributed river runoff, and regional climate.宇宙航空研究開発機構によって2014 年2 月に打ち上げられた全球降水観測計画（GPM: Global Precipitation Measurement）の主衛星は高緯度地域の降水量が新規に得られる。このデータの検証は，今後の寒冷圏陸域の水循環・水資源研究等への利用促進に向けた観測精度の向上を図るうえで必要不可欠である。本研究プロジェクトでは，観測研究を実施してきた国内外の機関が協働して，北東ユーラシア（主としてモンゴル・東シベリア）で既設の観測システムを改良し，他の衛星データ解析と合わせて，夏季降水（降雨），冬季降水（降積雪）およびそれらの空間分布に関する地上検証を行う。また，今後の応用研究に向けて，陸面モデル・分布型河川流出モデル，メソ気象モデルを利用した，地域規模のGPM 観測データの利用可能性を検討する。
• 第46回メソ気象研究会の報告―擬似温暖化実験のメソ気象研究に対する可能性―

  金田幸恵, 木村富士男, 吉野純, 高薮出, 佐藤友徳  天気  64-  119  -125  2017  [Refereed][Not invited]
  
• 気象庁の視程観測データを用いた冬季視程の統計解析

  呉廸, 佐藤友徳  北海道の雪氷  36-  133  -136  2017  [Not refereed][Not invited]
   

  2017年度北海道雪氷賞「北の風花賞」受賞
• アンサンブル気候予測データを用いた日本周辺の月降水量極端事象の将来変化

  初塚大輔, 佐藤友徳  細氷  63-  80  -81  2017  [Not refereed][Not invited]
  
• 北海道周辺における台風通過頻度の将来変化に関する要因解析

  松下侑未, 初塚大輔, 佐藤友徳, 吉田康平, 石井正好, 水田亮  細氷  63-  96  -97  2017  [Not refereed][Not invited]
  
• 最近20年間の寒冷圏陸域研究の進捗 (北半球寒冷圏陸域の気候・環境変動)

  飯島 慈裕, 佐藤 友徳  気象研究ノート  (230)  1  -11  2014/10  [Not refereed][Not invited]
  
• 寒冷圏陸域研究の将来像 (北半球寒冷圏陸域の気候・環境変動)

  飯島 慈裕, 佐藤 友徳  気象研究ノート  (230)  212  -219  2014/10  [Not refereed][Not invited]
  
• 北海道における夏季気候変動に関するマルチGCM×マルチRAM実験による力学的ダウンスケーリング

  INATSU MASARU, SATO TOMONORI, YAMADA TOMOHITO, KUNO RYUSUKE, SUGIMOTO SHIORI, FARUKH M.A, POKHREL YADU N, KURE SHUICHI  日本気象学会大会講演予稿集  (106)  125  2014/09/30  [Not refereed][Not invited]
  
• マルチGCM‐マルチRAMダウンスケーリング実験による北海道の冬季気候予測の不確実性評価

  SATO TOMONORI, INATSU MASARU, YAMADA TOMOHITO, KUNO RYUSUKE, SUGIMOTO SHIORI, FARUKH M.A, POKHREL Y.N, KURE SHUICHI  日本気象学会大会講演予稿集  (106)  477  2014/09/30  [Not refereed][Not invited]
  
• 北海道を対象とした地域気候予測研究について

  SATO TOMONORI, YAMADA TOMOHITO, INATSU MASARU, NAKAMURA KAZUKI, SUGIMOTO SHIORI, MIYAZAKI MAKOTO, KUNO RYUSUKE  日本農業気象学会全国大会講演要旨  2014-  88  2014  [Not refereed][Not invited]
  
• トマム地域における水溶性の乾性・湿性沈着エアロゾルの組成分布に関する初期的結果

  飯塚芳徳, 中村一樹, 佐藤友徳, 山中康裕  北海道の雪氷  33-  129  -132  2014  [Not refereed][Not invited]
  
• 2012年度秋季大会シンポジウム「気象学が地域の未来にいかに貢献できるか？ これからの北海道の地域づくりと気象学の研究」の報告

  佐藤友徳, 中村一樹, 柴田誠司  天気  61-  633  -634  2014  [Refereed][Not invited]
  
• 地域スケールの気候予測情報とその活用

  佐藤友徳  天気  61-  644  -648  2014  [Refereed][Not invited]
  
• 2012-2013年冬季初めの低気圧に伴う降雪に起因するトマム山の全層雪崩

  中村一樹, 佐藤友徳, 下山宏, 石川嵩  北海道の雪氷  32-  18  -21  2013  [Not refereed][Not invited]
  
• 北海道を対象とする総合的ダウンスケーリングの開発と適応

  稲津將, 山田朋人, 佐藤友徳, 中村一樹, 杉本志織, 宮崎真, 久野龍介  細氷  59-  (59)  2013  [Not refereed][Not invited]
  
• 北海道を対象とした地域気候研究の動向

  佐藤友徳, 山田朋人, 稲津將, 中村一樹, 杉本志織, 宮崎真, 久野龍介  北海道の農業気象  65-  12  -22  2013  [Not refereed][Not invited]
  
• 降雪系弱層形成時の気象の特徴

  中村一樹, 佐藤友徳, 秋田谷英次  北海道の雪氷  32-  14  -17  2013  [Not refereed][Not invited]
  
• 降雪結晶が原因となる表層雪崩弱層形成のモデル化

  中村一樹, 藤吉康志, 佐藤友徳, 平島寛行, 山口悟, 西村浩一, 山中康裕  日本気象学会大会講演予稿集  (102)  497  2012/09/30  [Not refereed][Not invited]
  
• 釧路の霧/下層雲に対する陸面過程の影響

  杉本志織, 佐藤友徳  日本気象学会大会講演予稿集  (102)  208  2012/09/30  [Not refereed][Not invited]
  
• 降雪結晶形が原因となる弱層形成のモデル化

  中村一樹, 藤吉康志, 佐藤友徳, 平島寛行, 山口悟, 西村浩一, 山中康裕  雪氷研究大会講演要旨集  2012-  183  2012/09/10  [Not refereed][Not invited]
  
• モンゴルにおける大気‐陸面相互作用の数値実験

  佐藤友徳, XUE Yongkang, BATBOLD Altangerel, 石川守  天気  59-  (5)  387-388  2012/05/31  [Not refereed][Not invited]
  
• 「ユーラシア・アジアモンスーン地域の気候-陸域相互作用研究会」の報告(研究会報告)

  安成哲三, 熊谷朝臣, 栗田進, 立入郁, 小野朗子, 上野健一, 徐健青, 浅沼順, 佐藤友徳, 市井和仁, 羽島知洋, 馬淵和雄  天気  59-  (5)  381  -391  2012/05  [Not refereed][Not invited]
  
• 夏季の釧路における霧日数の長期変化傾向に関する気候学的解析

  杉本志織, 佐藤友徳, 中村一樹  日本気象学会大会講演予稿集  (101)  347  2012/04/30  [Not refereed][Not invited]
  
• 気候変動に伴う台風の変化と損害保険

  今北詠士, 重里昌, 佐藤友徳, 三浦裕亮, 森正人, 加藤雅也, 木本昌秀, 坪木和久  日本気象学会大会講演予稿集  (101)  411  2012/04/30  [Not refereed][Not invited]
  
• メソ気象モデル

  Wakazuki, Y, F. Kimura, T. Sato, S. Adachi, C. Suzuki  筑波大学陸域環境研究センター報告  13-  59  -66  2012  [Not refereed][Not invited]
  
• 確率台風モデルを用いた近未来の台風変化予測

  重里昌, 増山啓, 今北詠士, 佐藤友徳, 三浦裕亮, 森正人, 木本昌秀  日本気象学会大会講演予稿集  (100)  384  2011/10/31  [Not refereed][Not invited]
  
• A365 雪氷変化による北海道の将来気候への影響(気象システムIII,,一般口頭発表)

  佐藤 友徳, 松村 伸治  大会講演予講集  100-  (0)  2011/10/31  [Not refereed][Not invited]
  
• P101 トマムにおける雲海発生メカニズムの研究と観光・教育への応用(ポスター・セッション)

  中村 一樹, 佐藤 友徳, 藤吉 康志, 佐藤 祐介, 吉村 暢彦, 山中 康裕  大会講演予講集  100-  (0)  2011/10/31  [Not refereed][Not invited]
  
• P114 北海道における昇温事例の時空間的特徴についての統計解析(ポスター・セッション)

  森 佳祐, 佐藤 友徳  大会講演予講集  100-  (0)  2011/10/31  [Not refereed][Not invited]
  
• P135 確率台風モデルを用いた近未来の台風変化予測(ポスター・セッション)

  重里 昌, 増山 啓, 今北 詠士, 佐藤 友徳, 三浦 裕亮, 森 正人, 木本 昌秀  大会講演予講集  100-  (0)  2011/10/31  [Not refereed][Not invited]
  
• トマムにおける雲海発生メカニズムの研究と観光・教育への応用

  中村一樹, 佐藤友徳, 藤吉康志, 佐藤祐介, 吉村暢彦, 山中康裕  日本気象学会大会講演予稿集  (100)  350  2011/10/31  [Not refereed][Not invited]
  
• 雪氷変化による北海道の将来気候への影響

  佐藤友徳, 松村伸治  日本気象学会大会講演予稿集  (100)  108  2011/10/31  [Not refereed][Not invited]
  
• 北海道における昇温事例の時空間的特徴についての統計解析

  森佳祐, 佐藤友徳  日本気象学会大会講演予稿集  (100)  363  2011/10/31  [Not refereed][Not invited]
  
• オホーツク海高気圧における大気‐陸面結合の役割

  松村伸治, 山崎孝治, 佐藤友徳  日本気象学会大会講演予稿集  (99)  185  2011/04/30  [Not refereed][Not invited]
  
• 北海道における土地被覆変化と地域気候影響の理想化実験

  佐藤友徳, 佐々木智規, 山崎孝治, 松村伸治  日本気象学会大会講演予稿集  (99)  184  2011/04/30  [Not refereed][Not invited]
  
• 台風の気候変動に伴う変化—各気象要素についての感度実験—

  重里昌, 増山啓, 佐藤友徳, 三浦裕亮, 末吉哲雄, 木本昌秀  日本気象学会大会講演予稿集  (99)  373  2011/04/30  [Not refereed][Not invited]
  
• C206 北海道における土地被覆変化と地域気候影響の理想化実験(気候システムII,一般口頭発表)

  佐藤 友徳, 佐々木 智規, 山崎 孝治, 松村 伸治  大会講演予講集  99-  (0)  2011/04/30  [Not refereed][Not invited]
  
• C207 オホーツク海高気圧における大気-陸面結合の役割(気候システムII,一般口頭発表)

  松村 伸治, 山崎 孝治, 佐藤 友徳  大会講演予講集  99-  (0)  2011/04/30  [Not refereed][Not invited]
  
• P318 台風の気候変動に伴う変化 : 各気象要素についての感度実験(ポスター・セッション)

  重里 昌, 増山 啓, 佐藤 友徳, 三浦 裕亮, 末吉 哲雄, 木本 昌秀  大会講演予講集  99-  (0)  2011/04/30  [Not refereed][Not invited]
  
• 第11回RSM に関する国際ワークショップ開催・参加報告

  佐藤友徳, 石崎紀子, 石崎安洋, 稲津將, 岡田直資, 仲江川敏之, 高藪出, 芳村圭, 金光正郎  天気  58-  (1)  41  -45  2011/01/31  [Refereed][Not invited]
  
• 大気物質循環モデルを利用した温暖化と黄砂発生量の研究/係留船舶の陸上に対する影響評価

  TSUNEMATSU Nobumitsu, HAYASAKI Masamitsu, SATO Tomonori, KUZE Hiroaki, SAI Hihi, KONDO Akihiko, SAKAMOTO Kohei, OSA Kohei, MIYABE Jiro, MIYABE Jiro  地球温暖化寄附研究部門報告書 平成23年  25  -28  2011  [Not refereed][Not invited]
  
• 第10回RSM に関する国際ワークショップ開催・参加報告

  佐藤友徳, 石崎紀子, 石崎安洋, 稲津將, 岡田直資, 仲江川敏之, 高藪出, 芳村圭, 金光正郎  天気  58-  41  -45  2011  [Refereed][Not invited]
  
• 北海道の開拓に伴う地域機構の変化

  佐藤友徳  気象講座「新しい気象」テキスト  29th-  17-23  2011  [Not refereed][Not invited]
  
• Estimation of snow structure with climate change in Hokkaido by SNOWPACK model

  Kazuki Nakamura, Tomonori Sato, Yasuhiro Yamanaka, Kouichi Nishimura  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research  2011-  50  2011  [Not refereed][Not invited]
  
• Influence of snow and sea-ice changes on future climate in Hokkaido: — Projection by the Pseudo-Global-Warming method —

  Shinji Matsumura, Tomonori Sato  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research  2011-  51  2011  [Not refereed][Not invited]
  
• Formation of weak layers by non-rimed new snow crystals at the mountain site in Hokkaido

  Kazuki Nakamura, Tomonori Sato, Yasushi Fujiyoshi, Kouichi Nishimura  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research  2011-  37  2011  [Not refereed][Not invited]
  
• 雪質変質モデルSNOWPACKを用いた地球温暖化による雪質変化推定の試み. −地球温暖化適応策検討の基礎データとして−

  中村一樹, 佐藤友徳, 山中康裕, 西村浩一  北海道の雪氷  30-  123  -126  2011  [Not refereed][Not invited]
  
• Development of method for estimation of changes in snow structure with climate change in Hokkaido

  印刷中  2011  [Not refereed][Not invited]
  
• 温暖化の空間パターンが黄砂発生の将来変化に及ぼす影響

  常松展充, 早崎将光, 佐藤友徳, 眞子直弘, 崔斐斐, 宮澤周司, 近藤昭彦, 久世宏明  日本気象学会大会講演予稿集  (98)  68  2010/09/30  [Not refereed][Not invited]
  
• 熱帯低気圧の気候変動に伴う変化‐低解像度環境場からの推定‐

  重里昌, 増山啓, 佐藤友徳, 三浦裕亮, 末吉哲雄, 木本昌秀  日本気象学会大会講演予稿集  (98)  389  2010/09/30  [Not refereed][Not invited]
  
• 中国東部およびモンゴルにおける地域気候モデルの降水再現性の検証

  佐藤友徳, XUE Yongkang  日本気象学会大会講演予稿集  (98)  72  2010/09/30  [Not refereed][Not invited]
  
• A202 中国東部およびモンゴルにおける地域気候モデルの降水再現性の検証(スペシャル・セッション「温暖化予測のための力学的および統計的ダウンスケーリング研究の現状と問題点」,口頭発表)

  佐藤 友徳, Xue YongKang  大会講演予講集  98-  (0)  2010/09/30  [Not refereed][Not invited]
  
• A164 温暖化の空間パターンが黄砂発生の将来変化に及ぼす影響(スペシャル・セッション「黄砂とバイオエアロゾル:発生-輸送-分布-沈着-影響評価へのモデル化-」,口頭発表)

  常松 展充, 早崎 将光, 佐藤 友徳, 眞子 直弘, 崔 斐斐, 宮澤 周司, 近藤 昭彦, 久世 宏明  大会講演予講集  98-  (0)  2010/09/30  [Not refereed][Not invited]
  
• P152 熱帯低気圧の気候変動に伴う変化 : 低解像度環境場からの推定(ポスター・セッション)

  重里 昌, 増山 啓, 佐藤 友徳, 三浦 裕亮, 末吉 哲雄, 木本 昌秀  大会講演予講集  98-  (0)  2010/09/30  [Not refereed][Not invited]
  
• 大気の温度傾度の将来変化が黄砂現象に及ぼす影響のシミュレーション

  常松展充, 早崎将光, 佐藤友徳, 眞子直弘, 崔斐斐, 宮澤周司, 近藤昭彦, 久世宏明  日本気象学会大会講演予稿集  (97)  195  2010/04/30  [Not refereed][Not invited]
  
• 低解像度平均場データから推定した温暖化後の台風強度

  重里昌, 増山啓, 佐藤友徳, 三浦裕亮, 末吉哲雄, 木本昌秀  日本気象学会大会講演予稿集  (97)  276  2010/04/30  [Not refereed][Not invited]
  
• 『水循環環境科学』における分野横断的な議論のための入門解説 1.大は小を兼ねるのか:ダウンスケーリング

  稲津將, 佐藤友徳  天気  57-  (4)  195-199  2010/04/30  [Not refereed][Not invited]
  
• 1. Downscaling : The Bigger the Better?(Introduction to Cross-Cutting Discussion on "Water Cycle Environmental Science")

  INATSU Masaru, SATO Tomonori  Tenki  57-  (4)  195  -199  2010/04/30  [Not refereed][Not invited]
  
• D209 大気の温度傾度の将来変化が黄砂現象に及ぼす影響のシミュレーション(物質循環I,一般口頭発表)

  常松 展充, 早崎 将光, 佐藤 友徳, 眞子 直弘, 崔 斐斐, 宮澤 周司, 近藤 昭彦, 久世 宏明  大会講演予講集  97-  (0)  2010/04/30  [Not refereed][Not invited]
  
• P226 低解像度平均場データから推定した温暖化後の台風強度(ポスターセッション)

  重里 昌, 増山 啓, 佐藤 友徳, 三浦 裕亮, 末吉 哲雄, 木本 昌秀  大会講演予講集  97-  (0)  2010/04/30  [Not refereed][Not invited]
  
• 黄砂の発生および輸送と逆転層との関係について

  常松展充, 岩井宏徳, 佐藤友徳, 酒井哲, 石井昌憲, 永井智広, 甲斐憲次, 木村富士男  日本地理学会発表要旨集  (77)  86  2010/03/10  [Not refereed][Not invited]
  
• 擬似温暖化実験

  佐藤友徳  天気  57-  (2)  111-112  2010/02/28  [Not refereed][Not invited]
  
• Pseudo global warming experiment

  佐藤 友徳  Tenki  57-  (2)  111  -112  2010/02/28  [Not refereed][Not invited]
  
• Estimating snow crystal shape distribution using the meteorological model

  Kazuki Nakamura, Tomonori Sato, Eiji Akitaya  Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research  2010-  132  2010  [Not refereed][Not invited]
  
• Influence of Spatial Patterns of Future Atmospheric Warming on Asian Dust Emission

  TSUNEMATSU Nobumitsu, HAYASAKI Masamitsu, SATO Tomonori, CUI Feifei, KONDOH Akihiko, KUZE Hiroaki, SAKAMOTO Kohei  Proc CEReS Int Symp Remote Sens  16th-  107-110  2010  [Not refereed][Not invited]
  
• 地球温暖化に伴う大気安定度の変化が黄砂の発生と輸送に及ぼす影響のシミュレーションの試行

  常松展充, 近藤昭彦, 久世宏明, 早崎将光, 崔斐斐, 宮澤周司, 佐藤友徳  日本気象学会大会講演予稿集  (96)  213  2009/10/31  [Not refereed][Not invited]
  
• 北東アジアにおける夏季の降水起源の年々変動について

  佐藤友徳  日本気象学会大会講演予稿集  (96)  130  2009/10/31  [Not refereed][Not invited]
  
• 低解像度平均場を用いた台風強度・頻度の推定方法の開発

  重里昌, 増山啓, 佐藤友徳, 末吉哲雄, 木本昌秀  日本気象学会大会講演予稿集  (96)  403  2009/10/31  [Not refereed][Not invited]
  
• B201 北東アジアにおける夏季の降水起源の年々変動について(気候システムII)

  佐藤 友徳  大会講演予講集  96-  (0)  2009/10/31  [Not refereed][Not invited]
  
• C207 地球温暖化に伴う大気安定度の変化が黄砂の発生と輸送に及ぼす影響のシミュレーションの試行(物質循環・放射)

  常松 展充, 近藤 昭彦, 久世 宏明, 早崎 将光, 崔 斐斐, 宮澤 周司, 佐藤 友徳  大会講演予講集  96-  (0)  2009/10/31  [Not refereed][Not invited]
  
• P171 低解像度平均場を用いた台風強度・頻度の推定方法の開発

  重里 昌, 増山 啓, 佐藤 友徳, 末吉 哲雄, 木本 昌秀  大会講演予講集  96-  (0)  2009/10/31  [Not refereed][Not invited]
  
• 環境場データを用いた台風の発生・経路の推定について

  増山啓, 重里昌, 佐藤友徳, 末吉哲雄, 木本昌秀  日本気象学会大会講演予稿集  (95)  358  2009/04/30  [Not refereed][Not invited]
  
• P337 環境場データを用いた台風の発生・経路の推定について

  増山 啓, 重里 昌, 佐藤 友徳, 末吉 哲雄, 木本 昌秀  大会講演予講集  95-  (0)  2009/04/30  [Not refereed][Not invited]
  
• 土地被覆改変と気候

  佐藤友徳  細氷  55-  2  -7  2009  [Not refereed][Not invited]
  
• 低解像度の気象場から台風の発生・経路を確率的に推定する試み

  佐藤友徳, 木本昌秀, 増山啓, 末吉哲雄, 重里昌  日本気象学会大会講演予稿集  (94)  455  2008/10/31  [Not refereed][Not invited]
  
• P310 低解像度の気象場から台風の発生・経路を確率的に推定する試み

  佐藤 友徳, 木本 昌秀, 増山 啓, 末吉 哲雄, 重里 昌  大会講演予講集  94-  (0)  2008/10/31  [Not refereed][Not invited]
  
• 全球雲解像モデルNICAMによる熱帯域の降水日変化と解像度依存性

  佐藤友徳, 三浦裕亮, 三浦裕亮, 佐藤正樹, 佐藤正樹, 高薮縁, 高薮縁  日本気象学会大会講演予稿集  (93)  238  2008/04/30  [Not refereed][Not invited]
  
• 地球温暖化による黄砂発生ポテンシャル変化の検証

  佐藤友徳, 木本昌秀  日本気象学会大会講演予稿集  (93)  454  2008/04/30  [Not refereed][Not invited]
  
• C406 全球雲解像モデルNICAMによる熱帯域の降水日変化と解像度依存性(熱帯大気)

  佐藤 友徳, 三浦 裕亮, 佐藤 正樹, 高藪 縁  大会講演予講集  93-  (0)  2008/04/30  [Not refereed][Not invited]
  
• P343 地球温暖化による黄砂発生ポテンシャル変化の検証

  佐藤 友徳, 木本 昌秀  大会講演予講集  93-  (0)  2008/04/30  [Not refereed][Not invited]
  
• 対流活動の日変化位相にみられる非静力モデルの水平解像度依存性

  佐藤友徳, 佐藤友徳, 吉兼隆生, 佐藤正樹, 佐藤正樹, 三浦裕亮, 藤波初木  日本気象学会大会講演予稿集  (92)  395  2007/09/30  [Not refereed][Not invited]
  
• P143 対流活動の日変化位相にみられる非静力モデルの水平解像度依存性

  佐藤 友徳, 吉兼 隆生, 佐藤 正樹, 三浦 裕亮, 藤波 初木  大会講演予講集  92-  (0)  2007/09/30  [Not refereed][Not invited]
  
• 浅く広くか, 深く狭くか?

  佐藤 友徳  水文・水資源学会誌 = JOURNAL OF JAPAN SOCIETY OF HYDROLOGY & WATER RESOURCES  20-  (5)  472  2007/09  [Not refereed][Not invited]
  
• 全球雲解像モデルNICAMによるチベット高原上の対流活動の日変化

  佐藤友徳, 佐藤友徳, 三浦裕亮, 佐藤正樹, 佐藤正樹  日本気象学会大会講演予稿集  (91)  184  2007/04/30  [Not refereed][Not invited]
  
• D102 全球雲解像モデルNICAMによるチベット高原上の対流活動の日変化(チベット高原気象学の進展,専門分科会)

  佐藤 友徳, 三浦 裕亮, 佐藤 正樹  大会講演予講集  91-  (0)  2007/04/30  [Not refereed][Not invited]
  
• 「浅く広くか，深く狭くか？」

  佐藤友徳  水文水資源学会誌  20-  472  2007  [Not refereed][Not invited]
  
• モンゴルの土地被覆改変による気候応答の研究

  佐藤友徳  筑波大学陸域環境研究センター報告  7-  (別冊No.2)  39  -42  2007  [Not refereed][Not invited]
  
• A report on the ESF-JSPS Frontier Science Conference Series for Young Researchers 2006 : Climate Change

  AKIYAMA Hiroko, ARIMOTO Masahiro, UEMURA Ryu, O'ISHI Ryouta, ZAIKI Masumi, SATO Tomonori, DAIRAKU Koji, TAGUCHI Masakazu, TOZUKA Tomoki, TOYODA Takahiro, NAGASHIMA Kana, NAGANO Takanori, NISHIZAWA Seiya, NISHIDA Satoshi, HORI Masatake, MIYOSHI Takemasa, YASUNAKA Sayaka, YAMAGUCHI Kosei, YAMADA Kazuyoshi, YOSHIKAWA Chisato, WATANABE Eiji  天気  53-  (12)  913  -918  2006/12/31  [Refereed][Not invited]
  
• A report on the ESF-JSPS Frontier Science Conference Series for Young Researchers 2006 : Climate Change

  AKIYAMA Hiroko, ARIMOTO Masahiro, UEMURA Ryu, O'ISHI Ryouta, ZAIKI Masumi, SATO Tomonori, DAIRAKU Koji, TAGUCHI Masakazu, TOZUKA Tomoki, TOYODA Takahiro, NAGASHIMA Kana, NAGANO Takanori, NISHIZAWA Seiya, NISHIDA Satoshi, HORI Masatake, MIYOSHI Takemasa, YASUNAKA Sayaka, YAMAGUCHI Kosei, YAMADA Kazuyoshi, YOSHIKAWA Chisato, WATANABE Eiji  Tenki  53-  (12)  913  -918  2006/12/31  [Not refereed][Not invited]
  
• Regional Climate Simulations to Diagnose Environmental Changes in Mongolia

  SATO Tomonori, KIMURA Fujio  筑波大学陸域環境研究センター報告  0-  (7)  59-69  -69  2006/11  [Not refereed][Not invited]
  
• ウランバートル周辺の対流活動の日変化の特徴‐なぜ,夜間に積乱雲活動が活発にならないのか?‐

  岩崎博之, 佐藤友徳, 新居知巳, 木村富士男, 中川清隆, 開發一郎, 小池俊雄  日本気象学会大会講演予稿集  (90)  180  2006/09/30  [Not refereed][Not invited]
  
• モンゴルにおける降水中酸素安定同位体比の季節内変動の要因について

  佐藤友徳, 佐藤友徳, 辻村真貴, 山中勤, 木村富士男, 岩崎博之, 杉田倫明  日本気象学会大会講演予稿集  (90)  261  2006/09/30  [Not refereed][Not invited]
  
• C207 ウランバートル周辺の対流活動の日変化の特徴 : なぜ, 夜間に積乱雲活動が活発にならないのか?(降水システムII)

  岩崎 博之, 佐藤 友徳, 新居 知巳, 木村 富士男, 中川 清隆, 開發 一郎, 小池 俊雄  大会講演予講集  90-  (0)  2006/09/30  [Not refereed][Not invited]
  
• P103 モンゴルにおける降水中酸素安定同位体比の季節内変動の要因について

  佐藤 友徳, 辻村 真貴, 山中 勤, 木村 富士男, 岩崎 博之, 杉田 倫明  大会講演予講集  90-  (0)  2006/09/30  [Not refereed][Not invited]
  
• CEOP/Himalayaリファレンスサイト踏査報告

  上野健一, 佐藤友徳, 佐藤友徳, 豊津和宏  水文・水資源学会誌  19-  (4)  302-306  2006/07/05  [Not refereed][Not invited]
  
• CEOP/Himalaya リファレンスサイト踏査報告

  上野 健一, 佐藤 友徳, 豊津 和宏  水文・水資源学会誌 = JOURNAL OF JAPAN SOCIETY OF HYDROLOGY & WATER RESOURCES  19-  (4)  302  -306  2006/07/05  [Not refereed][Not invited]
  
• Intensification of Convective Precipitation Systems over Tokyo Urban Area in Summer Season

  SATO Tomonori, TERASHIMA Tsukasa, INOUE Tadao, KIMURA Fujio  Tenki  53-  (6)  479  -484  2006/06/30  [Not refereed][Not invited]
   

  Modifications of precipitation systems by the metropolitan area in and around Tokyo (MAT) are investigated using radar data for twelve years period. Lag composite analysis of precipitation frequency is carried out for 71 summer days when strong precipitation echo was detected over mountainous area of Okuchichibu without synoptic scale disturbances near Kanto area. Most of precipitation systems generated in the mountainous area move eastward and arrive at the MAT in 2.5 to 3.5 hours after the initiation. Precipitation frequency in the MAT is remarkably high compared with that in surrounding ...
• 関東地方南部における降水系の強化と都市の関係

  佐藤友徳, 佐藤友徳, 寺島司, 井上忠雄, 木村富士男  日本気象学会大会講演予稿集  (89)  173  2006/04/30  [Not refereed][Not invited]
  
• チベット高原上の顕潜熱加熱とインドモンスーン降水との関連

  佐藤友徳, 佐藤友徳, 木村富士男  日本気象学会大会講演予稿集  (89)  407  2006/04/30  [Not refereed][Not invited]
  
• C205 関東地方南部における降水系の強化と都市の関係(降水システムII)

  佐藤 友徳, 寺島 司, 井上 忠雄, 木村 富士男  大会講演予講集  89-  (0)  2006/04/30  [Not refereed][Not invited]
  
• P340 チベット高原上の顕潜熱加熱とインドモンスーン降水との関連

  佐藤 友徳, 木村 富士男  大会講演予講集  89-  (0)  2006/04/30  [Not refereed][Not invited]
  
• 水の循環系モデリングと利用システム 北東アジア植生変遷域の水循環と生物・大気圏の相互作用の解明 土地利用変化と地球温暖化が北東アジアの気候に及ぼす影響予測

  佐藤友徳, 佐藤友徳, 木村富士男  研究領域「水の循環系モデリングと利用システム」第3回領域シンポジウム(平成15年度採択研究課題中間シンポジウム、平成13年度採択研究課題終了シンポジウム)講演要旨集 平成18年  144-145  2006  [Not refereed][Not invited]
  
• CEOP/Himalaya リファレンスサイト踏査報告

  上野健一, 佐藤友徳, 豊津和宏  水文・水資源学会誌  19-  302  -306  2006  [Not refereed][Not invited]
  
• Origin of water vapor in arid Asia simulated by regional climate model with simplified isotope process

  Sato, T, M. Tsujimura, T. Yamanaka, F. Kimura, H. Iwasaki, M. Sugita  Proceedings of the 2006 International Workshop on Terrestrial Change in Mongolia  27  -30  2006  [Not refereed][Not invited]
  
• 夏季のモンゴルに降水をもたらす擾乱

  川瀬宏明, 木村富士男, 佐藤友徳  日本気象学会大会講演予稿集  (88)  371  2005/10/31  [Not refereed][Not invited]
  
• モンゴルにおける積乱雲活動と可降水量の日変化の関係について

  岩崎博之, 佐藤友徳, 新居知巳, 李勝功, 開発一郎, 小池俊雄  日本気象学会大会講演予稿集  (88)  370  2005/10/31  [Not refereed][Not invited]
  
• P173 モンゴルにおける積乱雲活動と可降水量の日変化の関係について

  岩崎 博之, 佐藤 友徳, 新居 知巳, 李 勝功, 開發 一郎, 小池 俊雄  大会講演予講集  88-  (0)  2005/10/31  [Not refereed][Not invited]
  
• P174 夏季のモンゴルに降水をもたらす擾乱

  川瀬 宏明, 木村 富士男, 佐藤 友徳  大会講演予講集  88-  (0)  2005/10/31  [Not refereed][Not invited]
  
• モンゴル東部における雲の出現パターンと地形起伏の関係

  佐藤友徳, 長谷川明, 木村富士男  日本気象学会大会講演予稿集  (87)  319  2005/04/30  [Not refereed][Not invited]
  
• タクラマカン砂漠における接地逆転層の崩壊に伴った同時多発的なダスト発生—ライダーと数値モデルを用いた研究—

  常松展充, 甲斐憲次, 木村富士男, 佐藤友徳, 黒崎泰典, 永井智広, 松村貴嗣, 阿保真, 周宏飛  日本気象学会大会講演予稿集  (87)  117  2005/04/30  [Not refereed][Not invited]
  
• B207 タクラマカン砂漠における接地逆転層の崩壊に伴った同時多発的なダスト発生 : ライダーと数値モデルを用いた研究(物質循環II)

  常松 展充, 甲斐 憲次, 木村 富士男, 佐藤 友徳, 黒崎 泰典, 永井 智広, 松村 貴嗣, 阿保 真, 周 宏飛  大会講演予講集  87-  (0)  2005/04/30  [Not refereed][Not invited]
  
• P165 モンゴル東部における雲の出現パターンと地形起伏の関係

  佐藤 友徳, 長谷川 明, 木村 富士男  大会講演予講集  87-  (0)  2005/04/30  [Not refereed][Not invited]
  
• 現地観測と数値実験によるタクラマカン砂漠の砂麈嵐に関する研究

  常松展充, 甲斐憲次, 木村富士男, 佐藤友徳  食生活科学・文化及び地球環境科学に関する研究助成(CD−ROM)  2005-  ROMBUNNO.22  2005  [Not refereed][Not invited]
  
• Modeling approach to the atmosphere-hydrosphere-biosphere interactions in Mongolia

  Sato, T, G. Lee, M. Lu, P. Lee, Y. Chen, H. Kamimera, F. Kimura, T. Oikawa, M. Sugita  Bull. of the TERC, Univ. of Tsukuba  5 Suppl.-  60  -61  2005  [Not refereed][Not invited]
  
• Cloud frequency in eastern Mongolia and its relation to the orography

  Sato, T, F. Kimura, A. S. Hasegawa  Bull. of the TERC, Univ. of Tsukuba  5 Suppl.-  107  -109  2005  [Not refereed][Not invited]
  
• Downscaling of precipitation over Mongolia using regional climate model

  Kimura, F, T. Sato  Bull. of the TERC, Univ. of Tsukuba  5 Suppl.-  110  -111  2005  [Not refereed][Not invited]
  
• 北東アジアの乾燥域形成に及ぼすチベット高原の顕潜熱加熱

  佐藤友徳, 木村富士男  日本気象学会大会講演予稿集  (86)  96  2004/10  [Not refereed][Not invited]
  
• A355 北東アジアの乾燥域形成に及ぼすチベット高原の顕潜熱加熱(領域気候・水循環モデリング,スペシャルセッション「GAMEでアジアモンスーンはどこまでわかったか?」II)

  佐藤 友徳, 木村 富士男  大会講演予講集  86-  (0)  2004/10  [Not refereed][Not invited]
  
• 北東アジアにおける乾燥気候の形成に対するチベット高原の役割

  佐藤友徳, 木村富士男  日本気象学会大会講演予稿集  (85)  64  2004/05/16  [Not refereed][Not invited]
  
• B106 北東アジアにおける乾燥気候の形成に対するチベット高原の役割(気候システムI)

  佐藤 友徳, 木村 富士男  大会講演予講集  85-  (0)  2004/05  [Not refereed][Not invited]
  
• 2003年7月2日モンゴルで発生した漏斗雲とダウンバースト

  佐藤友徳  天気  51-  161  -162  2004  [Refereed][Not invited]
  
• モンゴルにおける地上風系の日変化について

  佐藤友徳  筑波大学陸域環境研究センター報告  4-  125  -128  2003  [Not refereed][Not invited]
  
• モンゴル国における地上風系の日変化について

  佐藤 友徳  筑波大学陸域環境研究センター報告  0-  (4)  125  -128  2003  [Not refereed][Not invited]
  
• 北東アジアにおける乾燥気候の形成と山岳による影響(数値実験)

  佐藤 友徳, 木村 富士男  大会講演予講集  82-  (0)  2002/10/09  [Not refereed][Not invited]
  
• 北東アジアにおける乾燥気候の形成と山岳による影響(数値実験)

  佐藤友徳, 木村富士男  日本気象学会大会講演予稿集  (82)  381  2002/10  [Not refereed][Not invited]
  
• 谷川岳周辺における二つの極大を持つ可降水量と対流活動の日変化

  岩崎博之, 木村富士男, 中川清隆, 佐々木太一, 佐藤友徳, 岡村修  日本気象学会大会講演予稿集  (81)  480  2002/05  [Not refereed][Not invited]
  
• 谷川岳周辺における二つの極大を持つ可降水量と対流活動の日変化

  岩崎 博之, 木村 富士男, 中川 清隆, 佐々木 太一, 佐藤 友徳, 岡村 修  大会講演予講集  81-  (0)  2002/05  [Not refereed][Not invited]
  
• 関東地方における夏季静穏日の数値シミュレーション

  佐藤 友徳, 木村 富士男, 岩崎 博之, 中川 清隆  大会講演予講集  80-  (0)  2001/10/10  [Not refereed][Not invited]
  
• 一般風と山谷風による水蒸気輸送の2次元数値シミュレーション(その2) : GPS可降水量と高層データによる検証

  佐藤 友徳, 木村 富士男  大会講演予講集  80-  (0)  2001/10/10  [Not refereed][Not invited]
  
• 一般風と山谷風による水蒸気輸送の2次元数値シミュレーション (その2) GPS可降水量と高層データによる検証

  佐藤友徳, 木村富士男  日本気象学会大会講演予稿集  (80)  391  2001/10  [Not refereed][Not invited]
  
• 関東地方における夏季静穏日の数値シミュレーション

  佐藤友徳, 木村富士男, 岩崎博之, 中川清隆  日本気象学会大会講演予稿集  (80)  247  2001/10  [Not refereed][Not invited]
  
• 一般風と山谷風による水蒸気輸送の2次元数値シミュレーション

  佐藤 友徳, 木村 富士男  大会講演予講集  79-  (0)  2001/05/08  [Not refereed][Not invited]
  
• 一般風と山谷風による水蒸気輸送の2次元数値シミュレーション

  佐藤友徳, 木村富士男  日本気象学会大会講演予稿集  (79)  182  2001/05  [Not refereed][Not invited]
  

Research Grants & Projects

• 気象気候の遠隔影響と予測可能性: 陸域プロセスを介した気象・気候変動の理解」

  Ministry of Education、Culture、Sports、Science and Technology：Arctic Challenge for Sustainability Ⅱ

  Date (from‐to) : 2020/06 -2025/03
• 急速に温暖化する日本周辺海域での大気海洋相互作用と極端気象

  日本学術振興会：科学研究費助成事業 新学術領域研究(研究領域提案型)

  Date (from‐to) : 2019/06 -2024/03 

  Author : 飯塚 聡, 万田 敦昌, 佐藤 友徳, 川瀬 宏明, 安永 数明, 美山 透
• Effects of land conversion from tropical peat swamp forest to oil palm plantations on ecosystem functions and the atmospheric environment

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (S)

  Date (from‐to) : 2019/06 -2024/03 

  Author : 平野 高司, 谷 晃, 伊藤 雅之, 林 真智, 平田 竜一, 佐藤 友徳, 小嵐 淳
• Pan-Arctic Water-Carbon Cycles

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (S)

  Date (from‐to) : 2019/06 -2024/03 

  Author : 檜山 哲哉, 立花 義裕, 佐藤 友徳, 朴 昊澤, 市井 和仁, 石川 守, 植山 雅仁, 伊藤 昭彦, 飯島 慈裕, 小谷 亜由美, 鈴木 和良, 水落 裕樹
• A study on precipitation variability over the Himalayas induced by the complex topography and large-scale moist flows

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))

  Date (from‐to) : 2018/10 -2022/03 

  Author : 藤波 初木, 佐藤 友徳, 平田 英隆, 高橋 暢宏, 藤田 耕史

   

  本課題は10月上旬より研究活動を開始した.12月3日～4日に名古屋大学にて研究分担者と研究協力者等(全14名）が参加してキックオフワークショップを開催し,本課題の具体的な研究目標や課題を共有した.2019年の暖候期から開始する降水量観測の準備として,測器(雨量計や温度計等)の選定と購入等を行った.3月5日～17日かけて, 研究代表者と研究協力者(全2名)がネパールに滞在し,ヒマラヤ山脈ロールワリン地方に新設する雨量計の設置場所6地点の選定と現地調査を行った.また,研究協力者が所属するカトマンズ大学と,今後共同研究を開始予定の国際総合山岳研究センター及びネパール水文気象局を訪問した.訪問した際に,本研究課題の趣旨と課題を教員,ポスドク研究員及び学生等に紹介して研究交流を行い,現地観測やデータ共有を含む共同研究体制を確認した. 研究に関しては,分担者が先行研究で実施したロールワリン地方の氷河質量収支の観測, 自動気象観測装置(AWS)の降水量データ及び流域水収支を用いて,ヒマラヤ高標高域の降水の推定を行った.ヒマラヤ域における衛星搭載降水データによる高解像度降水情報を用意し,長期平均値の地理的分布の状況や複雑地形に関連する推定誤差を吟味し,衛星データ利用価値や課題に関する理解を深めた.また,GPM二周波降水レーダのデータを整備し,ヒマラヤ山岳域の降水特性の初期解析を行った.AWSで観測された2016～2017年暖候期の1時間間隔の降水量データの初期解析を行い,ヒマラヤ高標高域の降水量変動とベンガル湾で発生するモンスーン低気圧との関係を確認した.また,モンスーン低気圧の自動追跡や流跡線解析を行うためのプログラム群の作成及び準備を行った.ヒマラヤにおける降水システムの高解像度雲解像シミュレーションのテスト実験を実施し,水平解像度約3kmの設定で実行可能であることを確認した.
• 領域テーマC 統合的気候変動予測

  Ministry of Education、Culture、Sports、Science and Technology：Integrated Research Program for Advancing Climate Models

  Date (from‐to) : 2020/04 -2022/03
• 北極水循環変化：環境の持続可能性と自然資源へのインパクト

  Japan Science and Technology Agency：Strategic International Collaborative Research Program, 北極観測および北極域における自然利用とエネルギー資源開発のための科学技術

  Date (from‐to) : 2019/04 -2022/03
• North eastern Eurasia PMM Terrestrial UNited validation Experiment (NEPTUNE)

  Japan Aerospace Exploration Agency：PMM: Precipitation Measuring Mission

  Date (from‐to) : 2016/04 -2019/03
• ①信頼度の高い近未来予測技術開発, ②超高解像度ダウンスケーリグ技術の開発

  Ministry of Education, Culture, Sports, Science and Technology：気候変動適応技術社会実装プログラム（ＳＩ－ＣＡＴ）

  Date (from‐to) : 2015 -2019 

  Author : 木村 富士男, 石川 洋一
• 北極域環境における多圏相互作用の実態解明と気候予測への応用

  Ministry of Education, Culture, Sports, Science and Technology：北極域研究推進プロジェクト【環境技術等開発事業費補助金】 ArCS

  Date (from‐to) : 2015 -2019 

  Author : 深澤 理郎
• 日本およびアジア地域における過去の地域気候変動のアトリビューション

  日本学術振興会：科学研究費補助金 （若手研究A）

  Date (from‐to) : 2015 -2018 

  Author : Tomonori Sato
• 超高解像度観測と数値モデルによる大雪や突風をもたらす降雪雲の動態に関する研究

  日本学術振興会：科学研究費補助金 （基盤研究A）

  Date (from‐to) : 2014 -2016 

  Author : 山田 芳則
• 北極気候変動分野「急変する北極気候システム及びその全球的な影響の総合的解明」北極温暖化のメカニズムと全球気候への影響：大気プロセスの包括的研究

  Ministry of Education, Culture, Sports, Science and Technology：グリーン・ネットワーク・オブ・エクセレンス（GRENE）事業

  Date (from‐to) : 2013 -2015 

  Author : 浮田 甚郎
• 確率モデリングによる境界永久凍土分布図の作成

  日本学術振興会：科学研究費補助金（基盤研究C）

  Date (from‐to) : 2013 -2015 

  Author : 石川 守
• 気候系のhot spot: 熱帯と寒帯が近接するモンスーンアジアの大気海洋結合変動, 大気・海洋・海氷相互作用系の変動による北日本の冬季降水への影響

  日本学術振興会：科学研究費補助金 新学術領域 公募研究

  Date (from‐to) : 2013 -2014 

  Author : 中村 尚
• 気候変動適応研究推進プログラム, 北海道を対象とする総合的ダウンスケール手法の開発と適用

  Ministry of Education, Culture, Sports, Science and Technology：気候変動適応研究推進プログラム

  Date (from‐to) : 2010 -2014 

  Author : 三村 信男
• S-8 温暖化影響評価・適応政策に関する総合的研究, S-8-1(2)温暖化ダウンスケーラの開発とその実用化, S-8-1(2)③影響評価研究者および政策担当者との連携とダウンスケーラの有用性の評価

  環境省：環境研究総合推進費

  Date (from‐to) : 2010 -2014 

  Author : 三村 信男
• ヒマラヤ・アッサム・バングラデシュ地域に豪雨をもたらす準2週間周期変動の解明

  Ministry of Education, Culture, Sports, Science and Technology：科学研究費補助金（基盤研究B）

  Date (from‐to) : 2010 -2012 

  Author : 安成 哲三
• 全球雲解像大気モデルの熱帯気象予測への実利用化に関する研究

  Japan Science and Technology Agency：戦略的創造研究推進事業(CREST)

  Date (from‐to) : 2005/10 -2011/03
• 土地利用変化と地球温暖化による北東アジアの気候変動予測の数値実験

  日本学術振興会：優秀若手研究者海外派遣制度

  Date (from‐to) : 2010/03 -2010/06 

  Author : Tomonori Sato
• Diurnal cycle of precipitation simulated in global cloud resolving model

  Ministry of Education, Culture, Sports, Science and Technology：Grants-in-Aid for Scientific Research(若手研究スタートアップ)

  Date (from‐to) : 2008 -2009 

  Author : Tomonori SATO
• チベット高原がアジアの気候形成に及ぼす影響

  日本学術振興会：科学研究費補助金（特別研究員奨励費）

  Date (from‐to) : 2006/04 -2007/11 

  Author : 佐藤 友徳
• 北東アジア植生変遷域の水循環と生物・大気圏の相互作用の解明

  Japan Science and Technology Agency：戦略的創造研究推進事業(CREST)

  Date (from‐to) : 2001 -2006
• Impact of Initialized Land Temperature and Snowpack on Sub-seasonal to Seasonal Prediction (LS4P)

  GEWEX/GASS：