2002年6月21～24日梅雨锋暴雨过程中的水汽羽特征
THE CHARACTERISTICS OF WATER VAPOR PLUME IN THE HEAVY RAIN EVENTS DURING 21—24 JUNE 2002
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摘要: 利用GMS-5水汽图像和NCAR/NCEP再分析资料,分析了2002年6月21～24日长江中下游梅雨锋暴雨过程中水汽图像上水汽羽的特征。结果表明:日平均水汽图像上显示了这次暴雨过程中对流层中上部的主要水汽型,是一条热带水汽羽从孟加拉湾经过青藏高原东部向偏东方向伸展至江淮地区,并与中纬度水汽羽相互作用,暴雨云团在热带水汽羽中连续生成。这条热带水汽羽是一条深厚暖湿输送带,反映了中高层水汽从孟加拉湾向长江下游的输送,以及通过大尺度上升运动造成的水汽自下而上的垂直输送,并且水汽羽与对流层上层的负涡度和正散度区域有很好的对应关系。水汽羽的北部边界附近的暗带与一条强涡度梯度和高空急流轴相关,具有明显的斜压性。Abstract: GMS-5 water vapor imagery and NCAR/NCEP reanalysis data are used to analysis the characteristics of water vapor plume (WVP) during 21—24 June 2002 heavy rain events in the Meiyu front. A tropical WVP is the remarkable feature on the series of daily-mean water vapor imagery. It stretches northeastward from the Bay of Bengal along the east of Tibet an Plateau to the Yangtze River and Huaihe River Basins, and interacts with the mid-latitude WVP. Therefore the mesoscale convective systems occur in succession within the tropical WVP no matter how the water vapor pattern changed.
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