Modeling permafrost properties in the Qinghai-Xizang (Tibet) Plateau

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• 作者：GuoJie Hu ; Lin Zhao ; XiaoDong Wu ; Ren Li ; TongHua Wu…
• 关键词：permafrost ; COUPMODEL ; hydrothermal processes ; phase change ; soil temperature ; soil moisture
• 刊名：Science China Earth Sciences
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：58
• 期：12
• 页码：2309-2326
• 全文大小：2,992 KB
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  Li R, Zhao L, Ding Y
• 作者单位：GuoJie Hu (1)
  Lin Zhao (1)
  XiaoDong Wu (1)
  Ren Li (1)
  TongHua Wu (1)
  ChangWei Xie (1)
  QiangQiang Pang (1)
  Yao Xiao (1)
  WangPing Li (1)
  YongPing Qiao (1)
  JianZong Shi (1)
  
  1. Cryosphere Research Station on Qinghai-Xizang Plateau, State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, 730000, China
  
• 刊物主题：Earth Sciences, general;
• 出版者：Springer Berlin Heidelberg
• ISSN：1869-1897

文摘

Water and heat dynamics in the active layer at a monitoring site in the Tanggula Mountains, located in the permafrost region of the Qinghai-Xizang (Tibet) Plateau (QXP), were studied using the physical-process-based COUPMODEL model, including the interaction between soil temperature and moisture under freeze-thaw cycles. Meteorological, ground temperature and moisture data from different depths within the active layer were used to calibrate and validate the model. The results indicate that the calibrated model satisfactorily simulates the soil temperatures from the top to the bottom of the soil layers as well as the moisture content of the active layer in permafrost regions. The simulated soil heat flux at depths of 0 to 20 cm was consistent with the monitoring data, and the simulations of the radiation balance components were reasonable. Energy consumed for phase change was estimated from the simulated ice content during the freeze/thaw processes from 2007 to 2008. Using this model, the active layer thickness and the energy consumed for phase change were predicted for future climate warming scenarios. The model predicts an increase of the active layer thickness from the current 330 cm to approximately 350-90 cm as a result of a 1-°C warming. However, the effect active layer thickness of more precipitation is limited when the precipitation is increased by 20%-0%. The COUPMODEL provides a useful tool for predicting and understanding the fate of permafrost in the QXP under a warming climate. Keywords permafrost COUPMODEL hydrothermal processes phase change soil temperature soil moisture