摘要
为更好分析近几十年来亚州-太平洋涛动(Asian-Pacific oscillation,APO)的时空变化特征及其对降水的影响。基于1961-2020年CN05.1逐月降水量资料和NCEP/NCAR月平均再分析资料,采用经验正交函数分解、合成分析以及回归分析等方法分析汛期(5-9月)APO的气候特征及其对中国同期降水的影响。结果表明:汛期亚州-太平洋地区对流层中上层扰动温度存在“跷跷板”式的反向分布特征,即亚洲对流层中上层扰动温度偏高(低)时,太平洋上空对流层中高层扰动温度偏低(高)。汛期亚州-太平洋涛动指数(APO index,APOI)与中国同期降水的相关关系由南至北呈“正—负—正”的空间分布,与长江流域汛期降水呈显著负相关关系、华北汛期降水呈显著正相关关系。对大气环流的分析表明,APO可通过改变亚洲夏季风环流影响中国汛期降水,APO与东亚和南亚夏季风均为正相关关系,即当APOI偏高时,亚洲夏季风整体偏强。
To better analyze the spatiotemporal characteristics of the Asian-Pacific Oscillation(APO)and its impact on precipitation in recent years.This study used CN05.1 monthly precipitation data from 1961-2020 and NCEP/NCAR monthly average reanalysis data with the empirical orthogonal function(EOF),composite analysis and regression analy-sis,the climatic characteristics of APO and the impact of it on flood season(May September)precipitation in China was researched.The results show that the“seesaw”reverse characteristics in the middle and upper troposphere temperature disturbance between the Asia and Pacific in summer remain in the flood season.When the middle and upper troposphere temperature disturbance above Asia is high(low),the middle and upper troposphere disturbance temperature above the Pacific Ocean is low(high).The correlation between the Asia-Pacific Oscillation Index(APOI)during the flood season and precipitation in China during the same period demonstrates a“positive—negative—positive”spatial distribution pat-tern from south to north.It shows a significant negative correlation with the flood season precipitation in the Yangtze Riv-er Basin and a significant positive correlation with the flood season precipitation in North China.Additionally,the Asian monsoon circulation is influenced by APO,which contributes to abnormal precipitation during the flood season in China.There is a positive correlation between APO and East Asian and South Asian summer monsoons,and when APOI is high,the Asian summer monsoon is generally strong.
作者
刘美希
华维
LIU Meixi;HUA Wei(College of Atmospheric Sciences,Chengdu University of Information Technology,Chengdu 610225,China;Plateau Atmosphere and Environment Key Laboratory of Sichuan Province,Chengdu 610225,China;Meteorological Disaster Prediction and Warning Engineering La-boratory of Sichuan Province,Chengdu 610225,China)
出处
《成都信息工程大学学报》
2024年第4期452-457,共6页
Journal of Chengdu University of Information Technology
基金
国家自然科学基金资助项目(42275022)
第二次青藏高原综合科学考察研究资助项目(2019QZKK010203)。
关键词
亚州-太平洋涛动
汛期降水
大气环流
Asia-Pacific oscillation
flood season precipitation
atmospheric circulation
