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《Plateau Meteorology》 2008-02
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Analysis on Simulation of Characteristic of Land Surface in Western Qinghai-Xizang Plateau during Frozen and Thawing

WANG Cheng-hai,SHI Rui,ZUO Hong-chao (Key Laboratory of West Environment Under Education Ministry of China,College of Atmosphere Sciences,Lanzhou University,Lanzhou 730000,China)  
Using CAMP/Tibet CEOP-EOP3 observational data at Gaize station in the western Qinghai-Xizang Plateau from October 2002 to September 2003,the land surface characteristics in the western Qinghai-Xizang Plateau were simulated by an improved land surface model CoLM(Common Land Model).The model reproduced surface thermal and moisture features.The simulated result indicated that,in western Qinghai-Xizang Plateau,the sensible heat flux dominates the surface heat energy balance,the latent heat flux is less,especially,in frozen season(arid),the latent heat flux is almost equal to zero.But during the thawing season(wet) in western Qinghai-Xizang Plateau,the latent heat flux can′t be ignored.When thawing occur,it is also transition time from arid season to rain/wet season(that is late of May),the changes of surface layer soil water phase frequently happen as result of thawing,these processes contribute to the latent heat flux.At same time,the Bowen ratio is decreased.The change of surface heat fluxes(sensible and latent heat) are associated with the precipitation and land surface frequent frozen-thaw.
【Fund】: 国家重点研究发展计划项目(2005CB422003);; 国家自然科学基金项目(40575037 40575032);; 中国气象局成都高原气象研究所开放基金项目;; NSFC创新群体项目(40421101)共同资助
【CateGory Index】: P46
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