气象科学2024，Vol.44Issue(2)：246-253,8.DOI:10.12306/2023jms.0060
江南春雨雨日的变化及其与欧亚大陆积雪的联系
The variation of spring persistent rainfall days over the southern China and its relationship with snow cover over Eurasia
摘要
Abstract
Based on the observed daily precipitation data over the southern China from 1960 to 2019,the Spring Persistent Rainfall(SPR)duration,variation of SPR days and its relationship with snow cover in Eurasia were investigated.Results show that the SPR was mainly long-duration rainfalll with more than 5 days.The SPR days had a significant decreasing trend,which may result in the decrease of long-duration rainfall.By using Singular Value Decomposition(SVD),it is found that there is a significant positive correlation between snow cover in Eurasia and SPR days during March to May.The regional averaged snow cover rate over(48°-59°N,90°-110°E)was defined as snow cover index.The regression analysis of the snow cover index and the atmospheric circulation show that,when there was less snow cover,the geopotential height anomaly at 500 hPa was positive,the wind and water vapor flux southwest anomalies at 850 hPa were negative over the southern China,leading to the decrease of the SPR days.By composition,it was further proved that less snow cover will cause northeast wind to suppress water vapor transportation to the southern China.关键词
江南/春季连阴雨/雨日/欧亚大陆积雪Key words
southern China/SPR/rainfall days/Eurasian snow cover分类
天文与地球科学引用本文复制引用
柴佳明,朱坚..江南春雨雨日的变化及其与欧亚大陆积雪的联系[J].气象科学,2024,44(2):246-253,8.基金项目
国家重点研发计划资助项目(2022YFC3202801) （2022YFC3202801）
