夏季江淮暴雨过程对大尺度湿度场的敏感性试验

SENSITIVITY OF SUMMER RAINSTORM IN YANGTZE AND HUAIHE RIVER VALLEY TO LARGE SCALE HUMIDITY FIELDS

用全球谱模式Ｔ４２Ｌ１ｌ对１９９１年６月底至７月初江淮暴雨的中期过程作敏感性试验，结果表明，在初始场中，当印度洋～孟加拉湾高湿中心附近（１００°Ｅ以西）的水汽减弱后，江淮雨量减少４５％，且东亚夏季风环流减弱。若南海～西太平洋高湿中心附近（１００°Ｅ以东）的水汽减弱时，则东亚夏季风环流反而加强，雨带移向华北。

Using a global spectral model T42L11 the sensitivity experiments to a rainstormprocess during period of June 26～July 1, 1991 are performed,The results show that ifthe vapour sources from Indian Ocean to Bay of Bengal(to the west of 100°E)werestrong cut down, East Asia monsoon circulation would be weakened ,and Meiyuprecipitation be reduced;on the contrary,when the moisture sources from West Pacificto the South China Sea(to the east of 100°E)were decreased, East Asia monsooncirculation would be strengthened, and the rainfall belt would move over to NorthChina.