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中文摘要：
利用青藏高原北部唐古拉综合观测场2006-2008年辐射平衡及活动层温度观测资料,分析了高原北部地表能量变化对活动层融化过程的影响.结果显示：该地地表能量具有明显的季节变化特征,总辐射、净辐射、土壤热通量及地面热源强度6-7月最大,11-12月最小;研究时段土壤热通量年平均值0.12MJ.m-2.d-1,活动层土壤以吸热为主;冻融循环期间,活动层温度垂直变化过程与地表能量的变化过程相似.活动层的融化厚度与地表能量过程密切相关,融化期间,随地表接收的太阳能的增大,融化厚度逐渐增大,当地表能量积累为0.0MJ.m-2时活动层的融化厚度最小;随着地表能量的积累,活动层融化厚度随之增大,可用乘幂关系描述二者之间的变化过程.
英文摘要：
Based on the data of radiation balance and active layer temperatures observed at Tanggula Integrated Observation site from 2006 to 2008,the impact of surface energy on the thawing process within the active layer in the northern Tibetan Plateau are analyzed.It is found that surface energy in this area has significant seasonal variation.The maximums of global radiation,soil heat flux and surface heat source take place in June or July,and the minimums of them take place in November or December.The annual mean soil heat flux during the study period is 0.12 MJ·m-2·d-1,and the active layer is endothermic mainly.During the freeze-thaw cycle period,the vertical variation process of temperature within the active layer is similar to that of surface energy.The surface thawing depth closely relates to the surface energy process.During the thawing period,the thawing depth increases gradually with the increase of solar energy received by ground surface.When the surface energy accumulation is 0.0 MJ·m-2,the thawing depth reaches the minimum,and then increases with the accumulation of surface energy.This process can be depicted by a power equation.
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