青藏高原西部冻融期陆面过程的模拟分析  

Analysis on Simulation of Characteristic of Land Surface in Western Qinghai-Xizang Plateau during Frozen and Thawing

作　　者：王澄海[1] 师锐[1] 左洪超[1] 

机构地区：[1]兰州大学大气科学学院甘肃省干旱减灾实验室,甘肃兰州730000

出　　处：《高原气象》2008年第2期239-248,共10页Plateau Meteorology

基　　金：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

摘　　要：利用CAMP/Tibet中CEOP-EOP3改则站2002年10月—2003年9月的观测资料作为强迫场,运用陆面过程模式CoLM(Common Land Model),对青藏高原西部陆面特征的模拟研究表明,在高原西部地表能量平衡过程中,冬半年,感热通量占主要地位,潜热通量较小;尤其在冻结期,潜热通量几乎等于零。但在高原西部的融冻期,潜热通量有显著变化。在干季向湿季转化时段的5月中下旬,表层土壤由于融冻而引起的频繁水分相变,使得潜热通量随之变化并开始增加,Bowen比由大变小。地表有效通量的变化与降水及土壤表层频繁的冻结—消融相联系。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.

关 键 词：青藏高原西部 陆面特征 CoLM模式 土壤冻融 有效辐射 

分 类 号：P404[天文地球—大气科学及气象学]