气象与环境学报2025，Vol.41Issue(4)：28-38,11.DOI:10.3969/j.issn.1673-503X.2025.04.004
2017-2021年冷涡背景下辽宁短时强降水时空分布及环境参数特征
The spatiotemporal distribution and environmental parameter characteristics of short-duration heavy rain in Liaoning under the background of Cold Vortex from 2017 to 2021
摘要
Abstract
Based on hourly precipitation data from automatic weather stations in Liaoning Province and ERA5 rean-alysis data from 2017 to 2021,the short-duration heavy rain(CV_SDHR)with hourly rainfall no less than 20 mm under the background of the Cold Vortex(CV)was selected and divided into different quadrants based on the rel-ative position of the automatic weather stations and the 500 hPa potential height center of the CV.The highest oc-currence frequency of CV centers lies between the eastern Inner Mongolia(110°～124°E)and the northern Hei-longjiang(48°N),up to 58°N when CV_SDHR occurs.The spatiotemporal distribution and environmental parame-ter characteristics of SDHR in different quadrants were compared.The results show that CV_SDHR accounts for 35.7%of the total SDHR.The proportion of CV_SDHR in different quadrants decreases in the following order:southeast(SE_SDHR),southwest(SW_SDHR),northeast,and northwest quadrants.CV_SDHR with large hourly rainfall and wide impact range is mainly concentrated in the southeast and southwest quadrants of CV.The central and northern parts of Liaoning is a high-risk area for CV_SDHR.The stations dominated by SE_SDHR cover the Liaohe River Basin and coastal areas,while the stations dominated by SW_SDHR are concentrated in northern part of Liaoning.CV_SDHR exhibits monthly and daily variation characteristics with unimodal distribution.It mainly appears in the afternoon to evening from July to August,but with variations in different quadrants regarding the peak proportion,occurrence time,and duration.The similarity of CV_SDHR in different quadrants is that the tem-perature and humidity profiles are closer,the CAPE is narrower,and the wind field is conducive to the formation of vertical wind shear.The difference is that SE_SDHR often occurs in warmer and wetter environments,and has stronger and vertical wind shear,which is more conducive to the occurrence of stronger and larger range of CV_SDHR.The SW_SDHR appears in environments with dry water vapor,strong static instability,and lower relative humidity near the ground,making it more conducive to the simultaneous occurrence of multiple severe convective weathers.关键词
冷涡/短时强降水/强对流物理量Key words
Cold Vortex/Short-duration heavy rain/Strong convective parameters分类
天文与地球科学引用本文复制引用
CAO Shiteng,YANG Lei,SUN Li,LU Juan,CHEN Yu,YANG Xue,JIANG Chao,LENG Yuxuan..2017-2021年冷涡背景下辽宁短时强降水时空分布及环境参数特征[J].气象与环境学报,2025,41(4):28-38,11.基金项目
中国气象局创新发展专项(CXFZ2022J059,CXFZ2023J013,CXFZ2024J021)、中国气象局沈阳大气环境研究所联合开放基金课题(2024SYIAEKFZD02、2025SYIAEKFMS11)、中国气象局云降水物理与人工影响天气重点开放实验室创新基金项目(2023CPML-B04)、北京市自然科学基金资助(8242043)、辽宁省气象局人才计划项目(RC202501)和中国气象局青年创新团队(CMA20240N05)项目共同资助. （CXFZ2022J059,CXFZ2023J013,CXFZ2024J021）
