热带气象学报2018，Vol.34Issue(1)：12-22,11.DOI:10.16032/j.issn.1004-4965.2018.01.002
云南雨季的时空特征及与大气环流变化的关系
STUDIES ON SPATIAL-TEMPORAL CHARACTERISTICS OF YUNNAN RAINY SEASON AND ITS RELATIONSHIP WITH ATMOSPHERIC CIRCULATION
摘要
Abstract
Based on the station standard of southwest rainfall season,the temporal and spatial features of Yunnan rainy seasons were investigated using 116 meteorological observation stations data from 1951-2015.At the same time,the influence of atmospheric circulation on Yunnan rainy seasons were further studied.The results are shown as follows:(1) For the 30-year (1981-2010) climatic mean,the beginning and ending date of Yunnan averaged rainy seasons are respectively on May 22 and October 15.The spatial differences of Yunnan rainy season variation are obvious in different region.The rainy season begins gradually from the southeast to the northwest and ends gradually from the northwest and southeast to the southwest,causing the length and total precipitation of the rainy season to decrease gradually from the south to the north;(2) For the beginning and ending date of annual rainy seasonsin Yunnan for 1961-2015,the earliest beginning date is May 8th and the latest date is June 8th.The endingdate is as early as September 30th and the latest November 2nd;(3) The changes of Yunnan rainy seasons are influenced jointly by the southwest monsoon and mid-latitude cold air.The early (late) establishment of southwest monsoon and frequent influence of cold air coming from the mid-latitude region may result in an early (late) rainy season.Different from the start of the rainy season,the end of a Yunnan rainy season is mainly affected by the tropical monsoon circulation.With early (late) shift of seasonal circulation from summer monsoon to winter monsoon,the Yunnan rainy season ends early (late).关键词
低纬高原/西南雨季标准/雨季开始和结束/西南季风/中高纬度冷空气活动Key words
low-latitude plateau/criterion of Yunnan rainy season/beginning and ending of rainy season/southwest monsoon/cold air activitiesin mid-high latitudes分类
天文与地球科学引用本文复制引用
晏红明,李清泉,王东阡..云南雨季的时空特征及与大气环流变化的关系[J].热带气象学报,2018,34(1):12-22,11.基金项目
国家自然科学基金面上项目(4157050542) （4157050542）
西南区域重点项目(2014-4) （2014-4）
云南省重点基金项目(2016FA041)共同资助 （2016FA041）
