2005年青藏高原唐古拉地区地表能量收支状况分析  

Surface Energy Budget in the Tanggula Region on the Tibetan Plateau,2005

作　　者：姚济敏[1] 赵林[1] 丁永建[1] 谷良雷[1] 乔永平[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所青藏高原冰冻圈观测试验研究站/冰冻圈科学国家重点实验室,甘肃兰州730000

出　　处：《冰川冻土》2008年第1期119-124,共6页Journal of Glaciology and Geocryology

基　　金：国家自然科学基金项目(40471026);中国科学院知识创新工程重要方向项目(KZCX3-SW-345);国家重点基础研究发展计划(973计划)项目(2005CB422003);中国科学院资源环境领域野外台站研究基金项目"青藏高原多年冻土活动层动态变化过程监测研究"资助

摘　　要：利用青藏高原唐古拉地区2005年涡动系统和10m气象塔数据资料，计算分析了该地区地表能量收支状况．结果表明：感热与潜热均有明显的季节变化特征，感热春季较大，夏季有下降趋势；潜热夏秋季节较大，冬春季节较小；净辐射在冬春季节主要转化为感热，夏秋季节转化为潜热，这些主要受季风、活动层冻、融过程及净辐射变化的影响．Bowen比夏秋季节平均为0．7，冬春季节平均为3．4，变化范围为-1．0～17．9．另外，研究显示降雨对感热、潜热通量影响较大．The sensible and latent heat fluxes in the Tanggula region in 2005 were calculated using the turbulent flux data observed from an eddy covariance system and. a meteorology gradient tower, 10 meter in height. The results show that the sensible heat flux was higher in spring and had a heat sink in summer due to the heat consumed in the thawing of the active layer. The latent heat flux was much higher in summer owing to the higher soil moisture content, resulting from the thawing of the active layer and more precipitation during the summer monsoon season. In winter and spring, the net radiation transformed mainly into the sensible heat flux, while in summer and autumn, the net radiation transformed mainly into the latent heat flux. Such phenomena had good relationship with the summer monsoon, the thawing and freezing processes of the active layer, and the variation of net radiation. In addition, Bowen ratio was 0.7 on average in summer and autumn, and 3.4 on average in winter and spring. The ratio ranged from -1.0 to 17.9, and exhibited that the Plateau seems a unique geographical unit. In addition, it was found that rainfall has great influence on the sensible and latent heat fluxes.

关 键 词：多年冻土 涡动相关 气象梯度法 唐古拉山 

分 类 号：P422.4[天文地球—大气科学及气象学]