The impact of surface energy exchange on the thawing process of active layer over the northern Qinghai–Xizang Plateau, China

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• 作者：Ren Li ; Lin Zhao ; Tonghua Wu ; Yongjian Ding ; Yao Xiao…
• 关键词：Energy exchange ; Thawing processes ; Active layer ; Qinghai–Xizang Plateau
• 刊名：Environmental Earth Sciences
• 出版年：2014
• 出版时间：September 2014
• 年：2014
• 卷：72
• 期：6
• 页码：2091-2099
• 全文大小：694 KB
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• 作者单位：Ren Li (1)
  Lin Zhao (1)
  Tonghua Wu (1)
  Yongjian Ding (1)
  Yao Xiao (1)
  Guojie Hu (1)
  Defu Zou (1)
  Wangping Li (1)
  Wenjun Yu (1)
  Yongliang Jiao (1)
  Yanhui Qin (1)
  
  1. Cryosphere Research Station on the Qinghai–Tibet Plateau, State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, 730000, China
  
• ISSN：1866-6299

文摘

In this study, we collected radiation and active layer temperature data observed in the northern Qinghai–Xizang Plateau during the period 2006-008 in order to analyze the impact of surface energy balance?on the thawing process of the active layer. Results show that surface energy exhibits an obvious seasonal variation. The largest values of energy variables including global radiation, net radiation, soil heat flux and surface heat source intensity occur during June and July, while the smallest values occur in November and December. The active layer is generally dominated by an endothermic process. During the freeze–thaw period, the variation process of the active layer temperature is similar to that of surface energy. The seasonal thawing depth is closely related to the process of surface energy exchange. During the thawing period, seasonal thawing depth gradually increases as more solar energy enters the surface. When the surface energy accumulation is 0.0?MJ?m??d?, the seasonal thawing depth is the smallest. The seasonal thawing depth gradually increases with further accumulation of surface energy. Thus, the variation processes between the surface energy and seasonal thawing depth can be expressed by a power relation. The values of seasonal thawing depth calculated with the empirical relationship provided in this study agree well with the observed values. The relative error between calculated and observed values is less than 12?%. These results show that this empirical relationship can be successfully used to describe the behavior of active layers.