气象学报Issue(3)：447-464,18.DOI:10.11676/qxxb2014.039
中国东部夏季暴雨日数的分布特征及其与大气环流和海温的关系
摘要
Abstract
By using the NCEP/NCAR reanalysis datasets,the NOAA SST datasets and Chinese 387-station daily precipitation data over eastern China for the period of 1961-2010,the spatiotemporal characteristics of rainstorm days during summer and their relationships with the atmospheric circulation and SST are studied.It is found that the summer rainstorm days over east-ern China experience three interdecadal variation processes in the recent 50 years.According to the EOF and cluster analysis, the summer rainstorm days over eastern China are divided into six distribution patterns,namely the Bohai Sea pattern,north pattern,Huaihe River pattern,Yangtze River pattern,south pattern,and both branches pattern.The relationships between the six distribution patterns and the atmospheric circulation show that the summer rainstorm days are closely related to the East Asian summer monsoon.The Bohai Sea pattern and the north pattern correspond to the monsoon with its position by north, while the Huaihe River pattern and Yangtze River pattern correspond to the monsoon with its position by south,and the south pattern corresponds to a weak monsoon with its pisition even souther.When the both branches pattern occurs,the monsoon is strong,and affects most parts of eastern China.The relationships of the different distribution patterns with water vapor trans-port characteristics show that moisture transport is closely related to an anticyclonic circulation anomaly in the western Pacific with more available moisture.The relationships of the different distribution patterns with SST show that the Bohai Sea pattern and the north pattern occur more likely in the La Ni~na development or maintenance period,the Huaihe River pattern and Yan-gtze River pattern occur more likely in the El Ni~no maintenance or decay period,the south pattern occurs in the El Ni~no devel-opment period.While the both branches pattern occurs,the Pacific and most of the northern Indian Ocean show a cold state and a significant land-sea thermal difference.关键词
暴雨日数/分布特征/环流背景场/海温Key words
Rainstorm days over eastern China/Spatiotemporal characteristics/Atmospheric circulation/SST分类
天文与地球科学引用本文复制引用
周放,孙照渤,许小峰,施健..中国东部夏季暴雨日数的分布特征及其与大气环流和海温的关系[J].气象学报,2014,(3):447-464,18.基金项目
资助课题国家自然科学基金项目（41105059）、江苏省高校自然科学研究项目（11KJB170006）。 （）
