季风汇合带与淮河流域的大暴雨

1980年8月23—24日,淮河流域连续两天出现大范围大暴雨。本文指出,由于从孟加拉湾—南海—西太平洋出现大尺度热带季风西南—南—东南气流汇合带,在交汇点下游的北方有西南涡生成,并强烈发展,具有7—8条螺旋状云带。低空西南急流的加强和推进,一方面在江淮之间形成能量锋区,一方面引导西南涡东移。在低涡中心南侧的淮河流域产生了暖区大暴雨。

Relationship between monsoon confluent zone and very heavy rain over Huaihe River

An extensive very heavy rain fell over the Huaihe River on August 23 and 24, 1980. It is pointed in this paper that due to the large-scale tropical SW-S-SE monsoon current confluent zone from the Bay of Bengal-South China Sea-NW Pacific, to its north, at the downstream of the confluent point, a South China vortex was introduecd and developed with 7-8 spiral cloud belts. The SW jet stream on lower level intensified and propagated eastward. It not only induced an energy frontal zone between Yangtze and Huaihe Rivers, but also steered the South China vortex moving eastward. At last, a very heavy rain occurred in the warm sector to the southside of the vortex, just over the Huaihe River.