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《Journal of Glaciology and Geocryology》 2018-02
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Simulation of the impact of vegetation and soil characteristics on permafrost over the Tibetan Plateau based on the Noah land surface model

WU Xiaobo;NAN Zhuotong;WANG Weizhen;ZHAO Lin;Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences;University of Chinese Academy of Sciences;School of Geography Science,Nanjing Normal University;  
The sparse vegetation and coarse soils are widely distributed on the Tibetan Plateau. In this study,the impacts of vegetation and soil characteristics on permafrost distribution were simulated,as well as the key characteristics including active layer thickness and mean annual ground temperature on the entire plateau,based on the Noah land surface model(LSM). The simulation results were assessed by comparing with field survey data. The results showed that the Noah LSM,taking the sparse vegetation and coarse soil into account,is capable of modelling permafrost over the plateau. The permafrost area was reduced from 1. 216 × 106 km~2 to 1. 113 × 10~6 km~2 after considering the impacts of sparse vegetation and coarse soils. The simulated spatial differences mainly appeared in the transitional areas between permafrost and seasonally frozen soil and the patchy permafrost areas in the southern part of the plateau. The simulated active layer thickness averaged over the plateau and mean annual ground temperature were increased from 2. 55 m to 2. 92 m and from -2. 17 ℃ to-1. 65 ℃,respectively.These results indicate that the sparse vegetation and coarse soils have great impact on permafrost over the plateau.
【Fund】: 国家重点研发计划项目(2017YFA0603603);; 国家自然科学基金项目(41671373;41671055)资助
【CateGory Index】: P642.14
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