西北地区冬季地面风速特征及其与春夏季地表感热的关系  

Study on Wind Speed in Winter and Its Relation with Surface Sensible Heat in Spring and Summer over Northwest China

作　　者：陈娟[1] 李栋梁[1,2] 王慧[1] 陈练[1] 

机构地区：[1]南京信息工程大学气象灾害省部共建教育部重点实验室,江苏南京210044 [2]中国气象局兰州干旱气象研究所,甘肃兰州730020

出　　处：《干旱区研究》2011年第4期677-687,共11页Arid Zone Research

基　　金：国家自然科学基金项目(40875059);干旱气象科学研究基金项目(IAM200801)共同资助

摘　　要：利用EOF、气候突变检测及相关统计方法,分析我国西北地区近37年(1970-2006)冬季地面风速的时空异常,并对近25年(1982-2006)西北干旱区春、夏季地表感热的时空异常变化及其与前期冬季风速的关系进行相应的研究。结果表明:近25年西北地区冬季风速下降趋势显著,20世纪70年代冬季地面风速普遍较大,80年代风速减小,90年代风速普遍较小,2000-2006年风速有缓慢上升的趋势。冬季风速的年代际变化趋势及突变年与春、夏季地表感热的变化基本一致,冬季风速变化与春、夏季地表感热变化有较好的正相关关系,相关显著的区域在天山、且末、哈顺戈壁至库姆塔格沙漠和内蒙古西部地区。In this paper,the spatial distribution and time evolution of wind speed over northwest China in winter in recent 37 years from 1970 to 2006 were analyzed base on EOF analysis,sharp climate change test and correlation analysis.The spatial distribution pattern and temporal variation trend of surface sensible heat in spring and summer as well as the correlation between wind speed in winter and surface sensible heat in next spring and summer in the arid regions of northwest China during the period of 1982-2006 were investigated and examined.Results show that the average wind speed over northwest China in winter in recent 25 years was significantly decreased,and wind speed was universally high in the 1970s,decreased in the 1980s,universally low in the 1990s,and increased slowly during the period from 2000 to 2006.The interdecadal variation and sharp change of wind speed accorded basically with the change of surface sensible heat in next spring and summer.There was a good positive correlation between wind speed in winter and surface sensible heat in next spring and summer,and the significant correlation occurred in the Tianshan Mountains,Qiemo,Hashun Gobi Desert,Kumtag Desert and west Inner Mongolia.

关 键 词：地面风速 地表感热 EOF分析 相关统计分析 气候突变 西北地区 

分 类 号：P425.4[天文地球—大气科学及气象学]