2017年我国秋季降水异常的特征分析  

Analysis on the Characteristics of Autumn Precipitation Anomaly in China in 2017

作　　者：覃国威 孟庆怡 Qin Guo-wei(Laibin Meteorological Bureau of Guangxi Zhuang Autonomous Region,Laibin,Guangxi 546100)

机构地区：[1]广西壮族自治区来宾市气象局,广西来宾546100 [2]贵州省黔西南州气象局,贵州兴义562400

出　　处：《农业灾害研究》2023年第1期109-111,共3页Journal of Agricultural Catastrophology

摘　　要：利用我国586个台站1962—2017年降水资料和NCEP/NCAR提供的2017年逐日再分析资料,分析了我国秋季降水的时空变化特征和2017年我国江淮地区秋季降水的特点和大尺度环流特征,分析了产生降水的系统、水汽和动力条件。结果表明:(1)我国秋季降水具有全国一致变化和以长江为界的南北反相变化2种主要模态;(2)2017年秋季我国江淮地区降水异常偏多,主要是由9月中旬的副高异常偏强,同时贝加尔湖西北部的槽与常年同期相比异常深厚造成。Based on the precipitation data of 586 stations in China from 1962 to 2017and the daily reanalysis data of 2017 provided by NCEP/NCAR, this paper analyzes the temporal and spatial characteristics of autumn precipitation in China, the characteristics of autumn precipitation in the Yangtze and Huaihe River regions in 2017 and the characteristics of large-scale circulation, and analyzes the system, water vapor and dynamic conditions that generate precipitation. The results show that:(1) there were two main modes of autumn precipitation in China: the national consistent change and the northsouth inverse change with the Yangtze River as the boundary;(2) In the autumn of 2017,the abnormal precipitation in Jianghuai region in China was mainly caused by the abnormally strong subtropical high in mid September and the unusually deep trough in the northwest of Baikal Lake compared with the same period of the year.

关 键 词：秋季降水 异常 环流特征 副热带高压 

分 类 号：P426.6[天文地球—大气科学及气象学]