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中文摘要：
利用2007年青藏高原冰冻圈观测研究站在唐古拉和西大滩综合观测场的实测资料,计算了藏北高原多年冻土区2种不同植被下垫面的能量收支各分量,并对其季节变化特征和主要影响因素进行了分析.结果表明,该区域地表净辐射季节变化十分显著,主要受到太阳高度角和下垫面状况的影响;地表热通量季节变化同净辐射相似;感热通量春季达到最大,在夏季有所下降,冬季最小,其变化与降水过程,土壤冻融过程,下垫面状况及净辐射变化密切相关;而潜热通量夏季最大,冬季最小,其变化主要受降水和土壤含水量的制约.藏北高原多年冻土区冬春两季地气能量交换以感热传输为主,夏秋两季则是潜热输送占主导地位.
英文摘要：
Based on the observed data in 2007 from Xidatan and Tanggula monitoring Sites（laid by Cryosphere Research Station on Qinghai-Xizang Plateau,CAS）,surface energy budget components of the two sites with different vegetation types were calculated.Their seasonal variation characteristics and the mean factors affecting them were analyzed.The results indicate that seasonal variation of net radiation is significant in this region,with the maximum in summer and the minimum in winter,and the solar elevation angle and underlying surface condition are the main influencing factors.Similar trend can be seen in soil heat flux.The sensible heat flux reaches the maximum in spring,followed by that in summer,and in winter it reaches the minimum,tightly depending on monsoon,thawing and freezing processes,underlying surface conditions and the variation of net radiation.However,latent heat flux,mainly constrained by precipitation and surface soil moisture,has the maximum in summer and the minimum in winter.In addition,energy between land and atmosphere is exchanged mainly in the form of sensible heat transfer during winter and spring,whereas latent heat flux turns to be dominant in summer and autumn.
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