北冰洋纬向温度梯度对中国东北地区夏季降水影响的分析  

The Impact of Zonal Temperature Gradient in the Arctic Ocean on the Summer Precipitation over Northeast China

作　　者：时晓曚[1] 孙雅文[1] 孙即霖[1] 

机构地区：[1]中国海洋大学物理海洋实验室海洋-大气相互作用与气候实验室,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2014年第2期11-16,共6页Periodical of Ocean University of China

基　　金：国家自然科学基金重点项目(40930844);国家自然科学基金面上项目(41276012);中国海洋大学创新研究基金项目(201261009)资助

摘　　要：利用1979—2011年NCEP提供的2m气温场、位势高度场、风场、GPCP降水以及HadISST资料,对北冰洋纬向温度梯度对中国东北地区夏季降水影响进行了分析。分析得出:纬向温度梯度高年东北地区呈现降水负异常,7、8月份最为显著,几乎涵盖整个东北区域。其原因是北冰洋纬向温度梯度与500hPa位势高度梯度之间存在正相关,巴伦支海和东西伯利亚海上空位势高度差变大,贝加尔湖区域地面上东部和南部较易出现异常反气旋。1月份海面风异常通过Ekman输送影响北冰洋纬向温度梯度,进而影响中国东部地区降水。The impact of zonal temperature gradient in the Arctic Ocean on the summer precipitation over Northeast China is investigated in this paper with the Hadley SST data, National Center for Environmental Prediction （NCEP） reanalysis data for air temperature, geopotential height, wind, Global Precipitation Climatology Project （GPCP） precipitation and Optimum Interpolation Sea Surface Temperature （OISST）. The results show that higher zonal temperature gradient coincides with negative summer precipitation anomalies in Northeast China. Specially, in the most significant months ,July and August, the temperature gradient influences almost the entire Northeast China region. It is reasonable that there is a positive correlation between the Arctic Ocean zonal temperature gradient and the 500 hPa geopotential height gradient. Higher zonal temperature gradient leads to larger 500 hPa geopotential height gradient between the Barents Sea and East Siberian Sea, coinciding with anomalous anticyclone on the ground of the Lake Baikal region. The January sea surface wind anomalies can influence the Arctic Ocean zonal temperature gradient through Ekman transport, thereby affecting the precipitation over eastern China.

关 键 词：温度梯度 东北降水 相关分析 合成分析 

分 类 号：P732.6[天文地球—海洋科学]