华南前汛期暖区暴雨流场结构的特征

THE TYPICAL STRUCTURE OF THE FLOW FIELD IN WARM-SECTION HEAVY RAIN OCCURRING IN SOUTHERN CHINA

关键词:  副热带急流  暖区暴雨  中尺度和天气尺度铅直运动

Key words:  Subtropical jet  Warm-section heavy rain  Meso-and synoptic-scale vertical motion

摘要:

用合成方法对三次典型的华南暖区暴雨进行了分析,综合给出了华南暖区暴雨的流场结构图,分析发现,这类暴雨具有波状结构,波长为300公里,暴雨区联系着其中一个最强的波。

Abstract:

A mesoscale analysis using composite method for three cases of warm section heavy precipition occurring in the Southern China region is presented in this paper. It was noted that a mesoscale convergent line was closely associated with heavy rain and induced the circulation on it's upper air. The distributions of 3-D meteorological element field in the warm-section heavy rain was examined. A series of wave was shown with wave-length about 300km and the heavy rain area just corresponded to the strongest one. Finally a typical structure of flow field about warm-section heavy rain was suggested.