气象Issue(2)：133-145,13.DOI:10.7519/j.issn.1000-0526.2014.02.001
2012年7月21日北京特大暴雨过程的水汽输送特征
Analysis on Water Vapor Transport and Budget of the Severe Torrential Rain over Beijing Region on 21 July 2012
摘要
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 equa-tion.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.关键词
721暴雨/水汽收支/水汽输送通道/水汽贡献Key words
extremely heavy rain on 21 July 2012/water vapor budget/water vapor transport corridors and contribution to water vapor分类
天文与地球科学引用本文复制引用
王婧羽,崔春光,王晓芳,崔文君..2012年7月21日北京特大暴雨过程的水汽输送特征[J].气象,2014,(2):133-145,13.基金项目
国家自然科学基金项目（40930951，41375057）共同资助 （）
