| 2003年淮河暴雨期大气水汽输送特征及成因分析 |
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| 引用本文： | 江虹.2003年淮河暴雨期大气水汽输送特征及成因分析[J].湖北气象,2007,26(2):118-124. |
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| 作者姓名： | 江虹 |
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| 作者单位： | 吉林省通化市气象局 通化134001 |
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| 摘 要： | 利用NCEP/NCAR再分析资料,分析了2003年淮河流域发生持续性暴雨期间的水汽输送情况,发现暴雨区的异常水汽并不是来自通常输送量最大的水汽输送通道2(来自印度洋孟加拉湾的西南气流经中南半岛到我国东部地区)和水汽通道3(来自孟加拉湾的水汽经中南半岛到达南海与南海的偏南气流汇合再向北输送),而主要来自位置异常西移的水汽输送通道4(来自副高南侧的偏东气流沿着副高边缘转向向东输送到我国东部雨区)。暴雨区内有大量的异常纬向水汽通量距平,但并没有对异常降水辐合产生贡献,而相对小量的经向水汽通量距平在暴雨区产生强烈的辐合,为持续性暴雨提供绝大部分水源。输送至暴雨区的大量经向异常水汽通量距平主要来源于暴雨区南侧紧邻的中国南部沿海地区,而不是主要的水汽源区——南海。造成大气中水汽输送及辐合异常状况的最主要原因是西北太平洋副热带高压的异常西伸,强度偏强,且长期稳定少动。此外,欧亚两槽一脊的环流形势和副高北侧异常加强的低层西风急流及其稳定性也是形成此次淮河流域持续性暴雨必不可少的条件。
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| 关 键 词： | 淮河流域 暴雨 水汽输送 |
| 文章编号： | 1004-9045（2007）02-0118-07 |
| 收稿时间： | 2006-11-12 |
| 修稿时间： | 2007-02-05 |
The Characteristics and the Cause Analyses of Vapor Transportation in the 2003 Huaihe River Heavy Rainfall Period |
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| JIANG Hong.The Characteristics and the Cause Analyses of Vapor Transportation in the 2003 Huaihe River Heavy Rainfall Period[J].Meteorology Journal of Hubei,2007,26(2):118-124. |
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| Authors: | JIANG Hong |
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| Institution: | Tonghua Meteorological Bureau of Jilin Province, Tonghua 134001 |
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| Abstract: | The vapor transportation instance is analyzed when the persisting heavy rainfall happened in Huaihe River basin in 2003,using NCEP/NCAR reanalysis data.The results show that the abnormal vapor over the rainfall area does not come from the generally maximal vapor transporting passage 2(the southwest current comes from Bengal Bay via India-China peninsula to the East of China) and the vapor transporting passage 3(the vapor flux from the Bay of Bengal arrives South China Sea and converges with the south current of South China Sea then flows to the north),but mainly comes from the extraordinarily westward moved transporting passage 4(the SW stream on the south side of the sub-tropical high is transported to the east rainfall area and turned east along the sub-tropical high's border).The rainstorm area has large amount of anomaly zonal vapor flux passing through,however this does not contribute to the abnormal precipitation convergence.But the relatively small amount of the anomaly radial direction vapor flux produces intense convergence in the downpour area,supplying the most water sources to the long-time-lasting heavy rain.The great deal of the anomaly vapor flux mainly comes from the southern part of the rainfall area which is close to the China southern coastal areas,but not the usually main vapor source area,South China Sea.The main reason for the vapor abnormal convergence and transportation over the studied areas is the sub-tropical high over the Northwest Pacific Ocean extends extremely west,becomes strong and stable.In addition,the Eurasian two ridges two troughs circulation pattern and the East Asian Subtropical westerly jet's extraordinary strength and stability are the indispensable qualification for this Huaihe River basin long-enduring heavy rain. |
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| Keywords: | Huaihe River basin Rainstorm Vapor transportation |
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