中国海洋大学学报（自然科学版）2024，Vol.54Issue(5)：23-32,10.DOI:10.16441/j.cnki.hdxb.20220463
江南5月降水与热带印-太海温及对流的联系
Relationship Between May Precipitation in Jiangnan and Tropical Indo-Pacific Sea Surface Temperature and Convection
摘要
Abstract
Taking the May precipitation in Jiangnan from 1980 to 2021 as the research object,this pa-per uses the data of CPC precipitation,NCEP atmospheric circulation and sea surface temperature in Hadley Centre to analyze the interannual variation characteristics of precipitation in May in Jiangnan,and its possible relationships with sea surface temperature anomaly(SSTA)and convective anomaly on the tropical Indian Ocean and Pacific Ocean.The results show that the pluvial years are usually accom-panied by the tropical Indian Ocean warm SSTA that has developed since the autumn of the previous year,and the easterly wind anomaly in 850hPa on the tropical eastern Indian Ocean to the South China Sea in the same time of May,while the convective activity over the tropical Indian Ocean is strong,which enhances the sinking air flow in the northwest Pacific Ocean through the Hadley circulation,which jointly leads to the enhanced westward extension of the WNPAC and promotes the transport of water vapor to the Jiangnan region.Since the winter before the dry years,the cold SSTA in the central and eastern parts of the tropical Indian Ocean has been developing continuously,showing significant convective suppression over the tropical Indian Ocean corresponding to the cold SSTA in the same period of precipitation.The abnormal Hadley circulation opposite to the dry years has promoted the develop-ment of abnormal cyclones in the Northwest Pacific and Indochina Peninsula,which is not conducive to the transport of water vapor to the Jiangnan region.In addition to the tropical Indian Ocean,the SSTA in the tropical Pacific Ocean and the Maritime Continent,and the convection anomaly over sea surface is also related to the anomalous anticyclone in the northwest Pacific Ocean and the precipitation anomaly in May in Jiangnan in some years,but it is more complex than the tropical Indian Ocean.关键词
江南5月降水/西北太平洋异常反气旋/热带印度洋/海表面温度异常/异常对流Key words
May precipitation in Jiangnan/Northwest Pacific anomaly anticyclone/tropical Indian Ocean/sea surface temperature anomaly/anomalous convection分类
天文与地球科学引用本文复制引用
郭浩康,李春,石剑..江南5月降水与热带印-太海温及对流的联系[J].中国海洋大学学报（自然科学版）,2024,54(5):23-32,10.基金项目
国家重点研究发展计划项目(2019YFA0607002)资助 Supported by the National Key Research and Development Program of China(2019YFA0607002) （2019YFA0607002）
