北京大学学报（自然科学版）2025，Vol.61Issue(3)：478-486,9.DOI:10.13209/j.0479-8023.2025.015
山西省2023年4月降水异常特征及成因分析
Characteristics and Possible Causes of Precipitation Anomalies over Shanxi Province in April 2023
摘要
Abstract
Based on the precipitation data of April over Shanxi Province from 1981 to 2023,NCEP/NCAR reanaly-sis atmospheric circulation and sea surface temperature data,the characteristics and causes of precipitation anomaly over Shanxi Province in April 2023 were summarized and discussed by using empirical orthogonal function decom-position,regression analysis,composite analysis and correlation analysis.The results show that the precipitation over Shanxi Province in April 2023 is 204.4%more than that in the same period of normal years,which is the highest amout in the same period since 1961.The precipitation anomaly is closely related to the atmospheric circulation ano-maly caused by the external forcing factor of sea surface temperature.The"-+-"abnormal distribution of the North Atlantic sea surface temperature from north to south in the late winter(January-February)is conducive to the streng-thening and maintenance of the"-+-+"abnormal wave train of the 500 hPa geopotential height field from the North Atlantic to East Asia in April,and the convergence of water vapor at 850 hPa to Shanxi.This favorable high-low circulation configuration is the main reason for the abnormal precipitation over Shanxi Province in April 2023.关键词
降水异常/大气环流/海表温度/山西省Key words
precipitation anomalies/atmospheric circulation/sea surface temperature/Shanxi Province引用本文复制引用
王大勇,王晓琼,柯宗建,张冬峰,陈颖,闫加海..山西省2023年4月降水异常特征及成因分析[J].北京大学学报（自然科学版）,2025,61(3):478-486,9.基金项目
中国气象局复盘总结专项(FPZJ2025-019,FPZJ2023-020)、中国气象局预报员专项(CMAYBY2020-018)和山西省基础研究计划(202303021222389)资助 （FPZJ2025-019,FPZJ2023-020）
