2003年夏季中高纬度环流与淮河流域降水

研究了 2 0 0 3年夏季中高纬环流特征以及乌拉尔山、鄂霍茨克海和贝加尔湖三个地区阻高指数逐候的变化情况。 6月下旬至 7月上旬东亚中高纬出现“双阻”形势 ,造成淮河流域持续一个多月的集中强降水 ,但是在 7月底 ,鄂霍次克海阻高再度建立并持续 ,致使盛夏西太平洋副热带高压较常年偏南 ,所以雨带的位置也未能北移。因此 2 0 0 3年夏季主要雨带维持在淮河流域

Middle-high Latitude Circulation and Rainfall of Huaihe River Basin in the Summer of 2003

The characteristics of the middle-high latitude circulation and the blocking high are analyzed. There were two blocking high in the middle-high latitude region of East Asia from the last ten days of June to the first ten days of July. This made the rainfall sustain in the Huaihe River Basin. In the last ten days of July, the blocking high in the Okhotsk Sea founded again and sustained in this place. So the subtropical high in western north Pacific region was in the south on an average, so the rain-belt did not advance northward and sustained mainly in the Huaihe River Basin.