气象科学2025，Vol.45Issue(3)：367-377,11.DOI:10.12306/2023jms.0027
浙江梅汛期极端短时强降水特征分析
Analysis on the characteristics of short-duration extreme rainfall in Meiyu period in Zhejiang
摘要
Abstract
By using the routine observation data,Doppler weather radars and ERA5 hourly reanalysis data(0.25°×0.25°)in Zhejiang province from 2015 to 2021,a comparative analysis was conducted on the similarities and differences in circulation,physical quantities,propagation,movement and organizational characteristics of five short-duration extreme rainfall events(cold shear type,warm shear type,upper low trough type,subtropical high edge type,subtropical high control type)during Meiyu period in Zhejiang.Results show that the annual frequency of short-duration extreme rainfall in Meiyu period shows a linear increasing trend,and the period from afternoon to evening is frequent,the high frequency precipitation area is mostly located on the east side of the mountain range.The precipitation of cold shear type and upper low trough type processes is concentrated near the energy front,the middle and low level jet are obvious,and the average CAPE of cold shear type process is the smallest,PW is mostly more than 69 mm with more mixed precipitation and the lowest height of convective,which mainly caused by the formation,merging and strengthening of short-lived multi-monomers.The average CAPE and T850-500 of upper low trough type process are the largest with more convective precipitation,which mainly caused by short-livedmobile multi-monomers and the train effect is significant sometimes.The precipitation of warm shear type,subtropical high edge type and subtropical high control type processes is concentrated at the top of the wet tongue,the proportion of mixed precipitation and convective precipitation of warm shear type is equivalent,with mainly convective precipitation of subtropical high edge type and subtropical high control type,the boundary layer of first two types are accompanied by ultra-low level jet.0-6 km Shear is the smallest of warm shear type which is not conducive to convective organization,and mainly caused by long-lived mobile multi-monomers.0-3 km and 0-6 km Shear of subtropical high edge type is relatively concentrated,the proportion of monomer and multi-monomer is the same,and the number of long-lived monomer is slightly more than short-lived monomer.The average CIN is the largest and the average 0-3 km Shear is the smallest of subtropical high control type with long-livedmobile monomers mainly.关键词
极端短时强降水/极端短时强降水过程/对流参数Key words
short-duration extreme rainfall/short-duration extreme rainfall process/convective parameters分类
天文与地球科学引用本文复制引用
沈晓玲,李锋,黄海迅,冯博..浙江梅汛期极端短时强降水特征分析[J].气象科学,2025,45(3):367-377,11.基金项目
浙江省气象局科技项目(2022ZD02) （2022ZD02）
