Abstract:
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.