Comparative Analysis of Energy Characteristics of Two Southwest Vortices in Sichuan Under Similar Circulation Backgrounds

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外文摘要：Based on ERA5 reanalysis data,the present study analyzed the thermal energy development mechanism and kinetic energy conversion characteristics of two extreme rainstorm processes in relation to the shallow southwest vortex in the warm-sector during a"rain-generated vortex"process and the deep southwest vortex in a"vortex-generated rain"process.The findings were as follows:(1)During the extreme rainstorm on August 11,2020(hereinafter referred to as the"8·11"process),intense surface heating and a high-energy unstable environment were observed.The mesoscale con-vergence system triggered convection to produce heavy rainfall,and the release of latent condensation heat generated by the rainfall promoted the formation of a southwest vortex.The significant increase(decrease)in atmospheric diabatic heating and kinetic energy preceded the increase(decrease)in vorticity.By contrast,the extreme rainstorm on August 16,2020(hereinafter referred to as the"8·16"process)involved the generation of southwest vortex in a low-energy and high-humidity environment.The dynamic uplift of the southwest vortex triggered rainfall,and the release of condensation latent heat from rainfall further strengthened the development of the southwest vortex.The significant increase(decrease)in atmospheric diabatic heating and kinetic energy exhibited a delayed progression compared to the increase(decrease)in vorticity.(2)The heating effect around the southwest vortex region was non-uniform,and the heating intensity varied in different stages.In the"8·11"process,the heating effect was the strongest in the initial stage,but weakened during the vortex's development.On the contrary,the heating effect was initially weak in the"8·16"process,and intensified during the development stage.(3)The available potential energy of the"8·11"process significantly increased in kinetic energy converted from rotational and divergent winds through baroclinic action,and the divergent wind energy continued to convert into rotational wind energy.By contrast,the"8·16"process involved the conversion of rotational wind energy into divergent wind energy,which in turn converted kinetic energy back into available potential energy,thereby impeding the further development and maintenance of the southwest vortex.

外文关键词：

southwest vortexsimilar circulation backgrounddiabatic heatingkinetic energyspatial non-uniform heating effect

作者：

周春花、张驹、肖红茹

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作者单位：

Sichuan Meteorological Disaster Prevention Technology Center,Chengdu 610072 China

Chengdu Meteorological Bureau,Chengdu 610072 China

Sichuan Meteorological Observatory,Chengdu 610072 China

基金：

Key Project of Joint Meteorological Fund of the National Natural Science Foundation of ChinaKey Project of the National Natural Science Foundation of ChinaInnovative Development Special Project of China Meteorological AdministrationInnovation Team Fund of Sichuan Provincial Meteorological Service

项目编号：

U224220242030611CXFZ2023J016SCQXCX7D-202201

出版年：

2024

DOI：

10.3724/j.1006-8775.2024.015

热带气象学报(英文版)

中国气象局广州热带海洋气象研究所

热带气象学报(英文版)

影响因子：0.169

ISSN：1006-8775

年,卷(期)：2024.30(2)