| 1998年长江流域梅雨期暴雨过程的水汽输送特征 |
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| 引用本文： | 姚文清,徐祥德,张雪金.1998年长江流域梅雨期暴雨过程的水汽输送特征[J].南京气象学院学报,2003,26(4):496-503. |
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| 作者姓名： | 姚文清 徐祥德 张雪金 |
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| 作者单位： | 1. 中国气象科学研究院,北京,100081
2. 北卡罗来纳州立大学,美国 |
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| 基金项目： | 基础研究重大项目前期研究专项 (NO2 0 0 1 CCB0 0 40 0 ) |
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| 摘 要： | 通过对1998年第二次青藏高原大气科学试验期间的加密观测资料、NCEP／NCAR资料、1998年6—7月暴雨2个关键强降水时段水汽通量特征的诊断分析及其区域边界水汽输入问题的数值模拟研究表明：1998年长江流域特大暴雨过程是在有利的持续异常且稳定的大尺度环境场及中尺度风场的配合下发生的；6月与7月水汽输送特征存在差异；高原中部区域西边界与中国区域南边界的水汽输送对此次梅雨期特大暴雨的形成均有重要作用，即水汽源及其侧边界水汽通道特征的显著变化对梅雨期不同阶段长江流域特大暴雨的形成、发生和发展作用明显；水汽的时空分布特征为长江流域持续性特大暴雨的预报提供了着眼点。
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| 关 键 词： | 长江流域 梅雨锋系 水汽输送 暴雨 侧边界 水汽输送特征 梅雨期 |
| 文章编号： | 1000-2022(2003)04-0496-08 |
| 修稿时间： | 2002年6月27日 |
Water Vapor Features in the Heavy Monsoon Precipitation Processes of 1998 over the Yangtze Basin |
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| YAO Wen-qing ,XU Xiang-de ,ZHANG Xue-jin.Water Vapor Features in the Heavy Monsoon Precipitation Processes of 1998 over the Yangtze Basin[J].Journal of Nanjing Institute of Meteorology,2003,26(4):496-503. |
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| Authors: | YAO Wen-qing XU Xiang-de ZHANG Xue-jin |
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| Institution: | YAO Wen-qing 1,XU Xiang-de 1,ZHANG Xue-jin 2 |
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| Abstract: | By means of the intensive observation data of the second TIPMEX(Tibetan Plateau Meteorological Science Experiment) in 1998 and the NCEP/NCAR reanalysis data,the diagnostic analyses on water vapor fluxs during the key period(June to July) of heavy rainfall processes in 1998 are performed,and the water vapor inflow on the lateral boundaries is numerically inrestigeted in this paper.The results show that the exceptional torrential rainfall processes of 1998 in the Yangtze Basin occurred under favorable conditions of sustained anomalous and steady synoptic scale environment and meso-scale wind fields;the water vapor transport feature in June was different from that in July;the water vapor transport on both the west and south boundaries of the region played an important role in the torrential rainfall processes,i.e. The noticeable change in the water vapor source and its corridor was important to the formation,and development of torrential rain at different stage of the meiyu period in the Yangtze Basin;the spatially and temporally distribution characteristics of water vapor gave some important clues for the prediction of sustained exceptional torrential rain over Yangtze River basin. |
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| Keywords: | heavy rainfall water vapor meiyu period lateral boundary |
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