盛夏副高脊线异常变化对我国气温影响及海气背景分析  

Abnormal Variation of the Ridge Line of Subtropical High in Midsummer Affecting Atmospheric Temperature in Our Country And the Background Analysis of Sea and Atmosphere

作　　者：任广成[1] 吴小林[1] 李旺[1] 

机构地区：[1]中国人民解放军二炮气象中心,北京102208

出　　处：《气象与环境科学》2009年第3期1-5,共5页Meteorological and Environmental Sciences

基　　金：军队科研项目资助

摘　　要：利用1951-2006年全国160站盛夏(7-8月)气温资料、北半球500 hPa高度场和北太平洋海温场资料,分析了盛夏西太平洋副高脊线位置异常变化对我国气温的影响及其与500 hPa大气环流和北太平洋海温的关系,结果发现:盛夏副高脊线异常偏北年主要集中出现在上世纪60年代和90年代,副高脊线异常偏南年则主要集中出现在上世纪80年代;盛夏副高脊线位置与长江流域及其以北至黄河中下游以南的我国中东部广大地区气温存在着很好的正相关关系;盛夏副高脊线位置异常变化与东亚中纬度500 hPa上空西风环流强弱变化密切相关,前期3月白令海至阿拉斯加地区500 hPa高度场异常变化对盛夏副高脊线位置变动有着较好的指示性,前期北太平洋海温距平分布型,尤其是前期3月北亚热带海区关键区海温、加利福尼亚海区关键区海温和关键区综合海温指数对盛夏副高脊线位置异常变化具有很好的指示意义。Utilizing atmospheric temperature data in midsummer（ from July to August） of 160 stations in whole country and the height field of 500 hPa in the northern hemisphere and sea temperature data in northern Pacific from 1951 to 2006, the paper analyzes the influence on atmospheric temperature in our country of the abnormal variation of site of the western Pacific subtropical high ridge line in midsummer, and the relation to the atmospheric circulation at 500 hPa and northern Pacific sea temperature. It finds in midsummer that the abnormal years of the western Pacific subtropical high ridge line locating more north mainly focus on 1960s and 1990s, and the abnormal years of the western Pacific subtropical high ridge line locating more south mainly focus on 1980s, and the site of the western Pacific subtropical high ridge line is positively connected with the atmospheric temperature in middle and eastern parts in our country from Yangtze River to the middle and lower reaches of Yellow River, and the abnormal variety of site of the western Pacific subtropical high ridge line is closely connected with intensity variety of west wind cir- culation at 500 hPa. And it also indicates a very good denoting signification to the abnormal of site of the western Pacific subtropical high ridge line as a result of sea temperature departure distributing field in north Pacific, especially the sea temperature in crucial region of north semitropical sea area and California sea area and sea temperature composite index in crucial region in March.

关 键 词：盛夏 副高脊线指数 西风环流指数 气温 综合海温指数 

分 类 号：P456.3[天文地球—大气科学及气象学]