大气科学2017，Vol.41Issue(4)：702-712,11.DOI:10.3878/j.issn.1006-9895.1611.16122
索马里越赤道气流对西南雨季开始早晚的影响
Influences of the Somalia Cross-Equatorial Flow on the Beginning Date of Rainy Season in Southwest China
摘要
Abstract
Based on the national monitoring standard of rainy season in Southwest China (SWC) issued by the China Meteorological Administration (CMA),and daily precipitation amount at 2513 meteorological stations in China and the NCEP/NCAR reanalysis project,climate features of the beginning date of the rainy season and its relationship with general circulations are analyzed in this paper.Results indicate that the mean beginning date is the fourth pentad in May.During the research period (1981-2014),the beginning date showed an advancing trend since 2000.Compared to the cross-equatorial flows (CEFs) over the South China Sea,the western Pacific and the Papua New Guinea,statistical results reveal a more significant relationship between the beginning date and the CEFs over Somalia (SCEF) and over the Bay of Bengal,especially the former.Stronger (weaker) SCEF is related to earlier (later) rainy season and more (less) precipitation in SWC.Both lagged correlation and composition analysis reveal a 10-day leading influence from the meridional wind along the SCEF channel.Since ten days before the beginning of the rainy season,the SCEF starts to strengthen continuously.Affected by the SCEF,both the westerly winds over the tropical Indian Ocean and the southwest monsoon transport enhance and bring more moisture to Southwest China,triggering the onset of rainy season in the region.关键词
索马里越赤道气流/孟加拉湾越赤道气流/西南雨季/夏季风Key words
Somalia cross-equatorial flow/Bay of Bengal cross-equatorial flow/Rainy season in Southwest China/Summer monsoon分类
天文与地球科学引用本文复制引用
白慧,高辉..索马里越赤道气流对西南雨季开始早晚的影响[J].大气科学,2017,41(4):702-712,11.基金项目
国家重点基础研究发展计划(973计划)项目2013CB430203,贵州省气象局气象科技开放研究基金项目黔气科合KF[2016]06号,公益性行业(气象)科研专项GYHY201306033 National Basic Research Program of China (973 Program) (Grant 2013CB430203),Meteorological Science and Technology Research Fund of Guizhou Meteorological Bureau (Grant KF[2016]06),Special Scientific Research Fund of Meteorological Public Welfare Profession of China (Grant GYHY201306033) （973计划）
