藏北高原地区干、雨季大气边界层结构的不同特征  

Structural Difference of Atmospheric Boundary Layer between Dry and Rainy Seasons over the Central Tibetan Plateau

作　　者：李茂善[1] 马耀明[1,2] 马伟强[1] Ishikawa Hirohiko 孙方林[1] Ogino Shin-Ya 

机构地区：[1]中国科学院寒区旱区环境与工程研究所,甘肃兰州730000 [2]中国科学院青藏高原研究所,北京100085 [3]日本京都大学防灾研究所,日本京都611-0011 [4]日本神户大学,日本神户库兵657-8501

出　　处：《冰川冻土》2011年第1期72-79,共8页Journal of Glaciology and Geocryology

基　　金：国家重点基础研究发展计划(973计划)项目(2005CB422003);全球变化研究国家重大科学研究计划项目(2010CB951700)资助

摘　　要：利用2004年4月预试验期(PIOP)和8月加强期(IOP)的无线电探空仪观测资料,分析了藏北高原地区干、雨季大气边界层结构的不同特征.结果显示:藏北高原地区边界层虚位温、比湿等日变化大,对流混合层高度较高,高度干季在2 211～4 430m之间,雨季在1 006～2 212m之间,干季的对流混合层高度明显高于雨季时的对流混合层高度.干季的比湿明显小于湿季比湿,在干季和雨季都存在逆湿现象;干季时水平风风向基本以偏西风为主,雨季低层2 500m以下基本以偏东风为主,上层以偏西风为主;干季近地层水平风速都较小,随高度增加风速迅速增大,雨季边界层内风速都较小.In this paper,based on the in-situ observation data of CAMP-Tibet,the structure of atmospheric boundary layer（ABL） were preliminarily studied during dry and wet seasons.The main results show： （a） The diurnal variation of the ABL is obvious over the central Tibetan Plateau.The height of ABL is different by season.It is range from 2 211 m to 4 430 m during pre-monsoon period,but is range from 1 006 m to 2 212 m during the monsoon period.The height of ABL is higher during the dry period than that during the wet period.（b）The humidity during the dry period is smaller than that during the rainy period,and there are reverse humidity both in the dry period and in the rainy period.（c）Horizontal wind direction is mostly slanting west during dry period.It blows slanting east wind under 2 500 m a.s.l.during rainy period,while wind direction is similar to that during dry period above 2 500 m a.s.l.The wind speed is small during rainy period and dry period in the lower layer.However,the wind speed is larger during dry period within upper ABL than that during rainy period.

关 键 词：藏北高原 大气边界层结构 干、雨季 

分 类 号：P433[天文地球—大气科学及气象学]