西藏积雪的空间分布特征及时间演变规律  

Spatial Distribution Characteristic and Time Evolution Rule of Snow in Tibet

作　　者：周晓莉[1] 假拉 肖天贵[1] ZHOU Xiao-li JIA La XIAO Tian-gui(College of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225, China Meteorological Observatory of Tibet Autonomous Region, Lhasa 850000, China)

机构地区：[1]成都信息工程大学大气科学学院,四川成都610225 [2]西藏自治区气象台,西藏拉萨850000

出　　处：《成都信息工程大学学报》2016年第5期508-518,共11页Journal of Chengdu University of Information Technology

基　　金：公益性行业(气象)科研专项资助项目(GYHY201406015);国家自然科学基金重点基金资助项目(91337215);国家重点基础研究发展计划资助项目(2013CB733206;2012CB417202)

摘　　要：为了解西藏积雪的时间变化规律和空间分布特征,采用统计分析和EOF分解方法,对西藏34个站点1979~2013年的日积雪深度和积雪日数资料进行系统分析,得出主要结论：（1）西藏地区积雪深度在2月最大,7月最小;积雪日数在1月最大,7、8月最小。（2）西藏地区年及春、夏、秋、冬季累积积雪深度和累积积雪日数都呈减小的趋势。（3）西藏地区年累积积雪日数和积雪深度主要有3个大值中心：喜马拉雅山脉中段地区;喜马拉雅山脉东段区;那曲地区中、东部。In order to understand spatial distribution characteristic and time evolution rule of snow in Tibet, this paper systematically analyzed the daily snow depth and snow cover days data at 34 meteorological stations in Tibet during 1979 -2013, by using the methods of statistical analysis and EOF. Main conclusions are as follows ： （ 1 ） snow depth reaches the maximum value in February and reaches the minimum value in July; snow coverage days reaches the maximum value in January and reaches the minimum value in July and August. （2） The accumulated snow depth and snow cover- age days shows a decreasing tendency in Tibetan year, spring, summer, autumn and winter. （3） There were 3 high-fre- quency center areas ofaccumulated snow depth and snow coverage days in one year ： the middle Himalayas area, the eastern Himalayas area and the middle and eastern Naqu area.

关 键 词：气象学 高原气象学 西藏 积雪 EOF 时间变化 空间分布 

分 类 号：P468.025[天文地球—大气科学及气象学]