Abstracts for the 5th International GAME Conf.
3-5 October 2001
Aichi Trade Center
Nagoya Japan
A comparative study of surface conditions and surface heat flux with seasonal march in Eurasian Continent
Hironori Yabuki (10), Yuji Kodama (11), Takeshi Ohta (12), Tetsuzo Yasunari (13), Shin Miyazaki (1), Michiaki Sugita (2), Rikie Suzuki (3), Osamu Tsukamoto (4), Ichiro Kaihotsu (5), Kenji Tanaka (6), Motomu Toda (7), Kenji Tanaka (8), Hirohiko Ishikawa (6)
(10) Frontier Observational Research System for Global Change
(11) Institute of Low Temperature Science Hokkaido Univ.
(12) Nagoya University
(13) ) Institute of Geoscience, University of Tsukuba
(1) Terrestrial Environment Research Center, University of Tsukuba
(2) Institute of Geoscience, University of Tsukuba
(3) IGCR-Tsukuba, Frontier Research System for Global Change
(4) Faculty of Sciences, Okayama University
(5) Faculty of Integral Arts and Science, Hiroshima University
(6) DPRI, Kyoto University
(7) Japan Science and Technology Corporation (JST) Domestic Research Fellow
(8) Kumamoto University
The long-term monitoring of surface fluxes and surface conditions are very important for unraveling the physical process of climate change. In this study we aimed to the comparison of seasonal variation of surface heat flux, soil moisture and vegetation in monsoon Asia to remedy the interaction between land-surface and atmosphere. Observation sites used for this abstracts are Arvaikheer, glass-land in Mongolia, Shouxian, paddy field in China, and Tak, mixed lands in Thailand. The characteristics of seasonal march of surface heat balance and surface conditions at each site are as follows. At Arvaikheer the soil moisture was high only in July and August. The climatological value of NDVI (Normalize Difference Vegetation Index) reached peak with the value of 0.3 in August but it was about 0.1 from November to April. The evaporative fraction (EF) was higher than 0.4 in July and August, which may be related to the seasonal variation of soil moisture and vegetation. At Shouxian the soil moisture was always high, which was about 30% to 40% in winter and about 70% to 80% in summer. NDVI showed double peaks in April and August, where is the place of semiannual cropland. EF was high all the year round, which may imply that the evaporation was very high due to the very wet surface. At Tak the soil moisture attained more than 30% in rainy season but less than 10% in dry season. NDVI was higher than 0.4 from June to December and it showed minimum in March. The seasonal variation of EF was same as NDVI.
Submittal Information
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Terrestrial Environment Research Center, University of Tsukuba | |
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Terrestrial Environment Research Center, University of Tsukuba 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577 | |
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shin@erc2.suiri.tsukuba.ac.jp | |