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The Microclimatic Characteristics in the Tanggula Pass on the Tibetan Plateau

YAO Ji-min,ZHAO Lin,GU Liang-lei,QIAO Yong-ping,XIAO Yao(Cryosphere Research Station on Qinghai-Xizang Plateau,State Key Laboratory of Cryospheric Sciences,CAREERI,CAS,Lanzhou Gansu 730000,China)  
The microclimatic characteristics in the Tanggula Pass were revealed through analyzing the full meteorology data collected by the Cryosphere Research Station on Qinghai-Xizang Plateau,Chinese Academy of Sciences in 2005.It was found that the most radiations had great seasonal characteristics,and the albedo was higher in winter and spring but lower in summer.The annual average albedo was 0.31.The air temperature,specific humidity,air pressure and soil temperature had the similar variation trends which were higher in summer but lower in spring and winter.However,the wind speed was higher in spring and winter,but lower in summer.Whether in dry season(the active layer was frozen) or in wet season(the active layer was thawed),there was a cold center over the ground because of the long wave radiation at night,and then the inverse air temperature phenomenon was come into being,when the atmosphere was stable,the turbulence activity was restrained,the wind speed was low,and then the vapor transportation was weak,resulting in a high specific humidity.During daytime,there was a warm center in the ground,and the ground temperature was high,when the turbulence activity was strong,and the wind speed was high,and then the vapor transportation became strong also,resulting in a low specific humidity.
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