气象2017，Vol.43Issue(6)：705-715,11.DOI:10.7519/j.issn.1000-0526.2017.06.007
2015年汛期我国南方季节内东西反相旱涝型及环流特征
The West-East Reverse Pattern of Intraseasonal Rainfall and Corresponding Circulations in the 2015 Flood Season
摘要
Abstract
Based on the observation and reanalysis data,the spatial mode and corresponding circulation characteristics of precipitation anomaly under pentad scale in Southern China during the 2015 flood season (from April to September)are analyzed by using the methods of empirical orthogonal function (EOF), composite analysis and significance test.The results show that the west-east reverse pattern of precipitati-on anomaly is the major mode in the developing phases of strong El Ni?o years and the pentad pattern in 2015 shows similar features.But the pentad scale of precipitation anomaly patterns can be divided into twotypes of west-east reverse patterns by using the first and third EOF mode,and they have obvious differ-ences in upper,middle,lower levels of the troposphere.The precipitation anomaly pattern of more in east and less in west (A1 )with the first EOF mode is dominated by the anticyclone activities around Philippines at the low level,but the pattern of more in east and less in west (A2)with the third EOF mode is domina-ted by tropical cyclone activities.The pattern of less in east and more in west (B1 )with the first EOF mode is obviously affected by the moving southward of the cold air activities,but the pattern of less in east and more in west (B2 )with the third EOF mode is dominated by abnormal position of the anticyclone ac-tivities around Philippines at the low level.The precipitation anomaly features of west-east reverse pattern in Southern China during the 2015 flood season are closely related to the positions of anticyclones around Philippines,tropical cyclone activities and the moving path of the cold air activities.关键词
汛期/南方/东西反相型/时空变化Key words
flood season/southern China/west-east reverse pattern/spatio-temporal variation分类
天文与地球科学引用本文复制引用
史霖,陈丽娟,李维京,范广洲..2015年汛期我国南方季节内东西反相旱涝型及环流特征[J].气象,2017,43(6):705-715,11.基金项目
国家重点基础研究发展计划(973计划)(2013CB430203和2015CB453203)、国家自然科学基金项目(41275073)、成都信息工程大学中青年学术带头人科研基金(J201516 和J201518)共同资助 （973计划）
