气象2017，Vol.43Issue(9)：1064-1072,9.DOI:10.7519/j.issn.1000-0526.2017.09.004
贵州省秋季雨日时空变化及其与大气环流的关系
Spatio-Temporal Variation of Autumn Rainy Days over Guizhou Province and Its Correlation with Atmospheric Circulation
摘要
Abstract
Based on autumn (September to November) rainy days of 81 stations in Guizhou from 1964 to 2013 and National Center for Environmental Prediction/Atmospheric Research Center (NCEP/NCAR) reanalysis data,the spatio-temporal variation of autumn rainy days in Guizhou and its relation with atmospheric circulation were analyzed with Morlet wavelet and synthetic analysis,and other ways.The results show that the autumn rainy days in Guizhou are increased gradually from southeast to northwest between 30.0 d and 52.3 d.Mean autumn rainy days in Guizhou are about 40.5 d.There is the decreasing trend of autumn rainy days in the past 50 years,and its regression coefficient is-1.9 d/10 a.There is an abrupt change around 1987 for the autumn rainy days,which are more than normal in 1964-1987 but less than normal in 1988-2013.Since 1997,the decreasing trend is the most obvious.The autumn rainy days in the past 50 years have obviously quasi 5-year and 2-3 year oscillation periods over Guizhou,of which the 5-year oscillation is the most obvious,2-3 year periodic oscillation is the second.At the same time,when the autumn rainy days are more over Guizhou,the South China Sea water vapor flux converges,the cold air activity is more active in the high latitudes,the East Asian trough is strong and the trough and ridge over the low latitudes deepen slightly,Guizhou lies in front of the India-Burma trough and,the strong southern airflow is in favor of the intersection of warm and cold airs,thus creating the frequent rainy weather;and vice versa.关键词
秋季雨日/时空变化/大气环流Key words
autumn rainy days/spatio-temporal variation/atmospheric circulation分类
天文与地球科学引用本文复制引用
严小冬,宋燕,夏阳,龙园,杨春艳..贵州省秋季雨日时空变化及其与大气环流的关系[J].气象,2017,43(9):1064-1072,9.基金项目
国家自然科学基金面上项目(41575091)、中国清洁发展机制基金赠款项目(2013031)、黔科合院士站(20144010)和中国气象局气候变化专项(CCSF201708)共同资助 （41575091）
