高原涡东移与东亚夏季风的关系分析

本文对1979～2017年6月1～5日有无高原涡东移年份从东亚夏季风的高低空环流系统进行对比分析表明:同一较短时间段，有长生命尺度东移高原涡与无高原涡东移的年份，东亚季风区的高低空环流系统有较明显差异，且不同路径东移高原涡高低空环流系统也有异同。(1)高度场:有高原涡东移年份，西风急流大值区较无高原涡东移年份明显偏东，南亚高压中心纬度大致相同，东北移、东南移路径南亚高压中心分别偏北、偏南。有高原涡东移年份东亚大槽较无高原涡东移年份偏东。东北移、东移、东南移的西太平洋副热带高压西伸脊点依次偏南，偏东。(2)水汽条件:有高原涡东移年份均伴随有贝加尔湖东南部输送至我国东北的宽的水汽带，不同东移路径与纬向风分量关系密切。(3)海平面气压场:有高原涡东移年份海陆气压差较大，且海平面气压随着高原涡东移出现一个向东逐渐减小的过程。 

Analysis on the Relationship between the Eastward Shift of the Plateau Vortex and the East Asian Summer Monsoon

In this paper,June 1~5 , 1979 to 2017,presence of plateau vortex eastward from the east Asian summer monsoon year of air circulation system comparison analysis shows that the same short period of time,have a long life scale east plateau vortex with no plateau vortex eastward movement of the year,the east Asian monsoon region of high and low air circulation system has the obvious difference,and different path east plateau vortex also have similarities and differences between high and low air circulation system.(1)Height field:There is a year when the plateau vortex shifted eastward,the large value area of the westerly jet was significantly easterly than in a year when no plateau vortex shifted eastwards.The south Asian high center has roughly the same latitude,and the south Asian high center was northerly and southerly in the path of the northeast and southeast migration.The east Asian trough in years with east shift of plateau vortex is east than that without east shift of plateau vortex.The west-extension ridge points of the subtropical high in the western Pacific moved by the northeast,east and southeast were in turn southerly and easterly.(2)Moisture transport field:plateau vortex eastward years are associated with the southeast of Lake Baikal to northeast China wide water vapor belt,different eastward path and zonal wind component(3)Sea level pressure field:plateau vortex eastward years pressure difference is bigger,the land and sea and east sea level pressure,as the plateau vortex eastward emergence of a gradually decreasing process.