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气象:2014,40(2):133-145
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2012年7月21日北京特大暴雨过程的水汽输送特征
(1.中国地质大学(武汉)环境学院,武汉 430074;2.中国气象局武汉暴雨研究所,武汉 430074;3.南京信息工程大学滨江学院,南京 210044)
Analysis on Water Vapor Transport and Budget of the Severe Torrential Rain over Beijing Region on 21 July 2012
(1.School of Environmental Studies, China University of Geosciences, Wuhan 430074;2.Institute of Heavy Rain, CMA, Wuhan 430074;3.Bingjiang College, Nanjing University of Information Science and Technology, Nanjing 210044)
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投稿时间:2013-07-01    修订日期:2013-09-11
中文摘要: 利用NCEP再分析资料,根据水汽收支方程计算2012年7月21日北京特大暴雨时期华北东北部暴雨区域的水汽收支情况并分析水汽输送特征。得到以下结论:经向水汽输送在此次暴雨过程中起主要作用,暴雨区内水汽主要来源于中、低层(500 hPa以下)的南边界。暴雨区内水汽的辐合与暴雨发生的时间和空间具有较好一致性,在低层水汽的辐合起主要作用,中高层水汽垂直输送作用更为显著。HYSPLIT后向轨迹模拟得到的结果显示根据水汽源地划分影响此次暴雨过程水汽输送路径主要有:从孟加拉湾、南海地区处于中低层直接北上的西南路径,以及中层以下从我国东部海域(黄海、东海为主)进入内陆之后北折向东北偏北方向运动的L形高湿路径;同时高层沿着西风带西北路径的干空气输送也对此次强降水有重要影响。三者中从东部海域到达暴雨区的水汽贡献率最大,而孟加拉湾、南海的水汽输送对于此次强降水起到了明显的增强作用。
Abstract:By using the NCEP reanalysis data, the vapor budget of the area covered by the severe torrential rain over the northeast of North China on 21 July, 2012 is calculated according to the vapor budget equation. The results show that meridional water vapor transportation is dominant while the extremely heavy rain hits Beijing Region, where most moist vapor comes from the southern boundary below 500 hPa. The low level regional moisture convergence is consistent with the time and space when the torrential rain breaks out and develops. Above the middle level the vertical vapor transport is more prominent. Then the variation features of the vapor transport corridors and their moisture contributions are got through the HYSPLIT mode. The backward trajectory analyses illustrate two major vapor transport corridors. The moistest vapor derived from Yellow Sea and East China Sea along the low level make the main moisture contribution during the heavy precipitation. Moisture from the South China Sea and the Bay of Bengal strengthens the water vapor in the region when the heavy rain starts and develops. Also the drier vapor corridor along the high level from the northwest of China plays an important role in this case.
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基金项目:国家自然科学基金项目(40930951,41375057)共同资助
引用文本:
王婧羽,崔春光,王晓芳,崔文君,2014.2012年7月21日北京特大暴雨过程的水汽输送特征[J].气象,40(2):133-145.
WANG Jingyu,CUI Chunguang,WANG Xiaofang,CUI Wenjun,2014.Analysis on Water Vapor Transport and Budget of the Severe Torrential Rain over Beijing Region on 21 July 2012[J].Meteor Mon,40(2):133-145.