基于FY-4卫星遥感的一次西南涡暴雨过程分析

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Analysis of SouthwestVortex Rainstorm ProcessBased on FY-4 Satellite Remote Sensing

WANG Xueqin GAO Hengzhou HU Chao （Meishan Meteorological Bureau，Meishan 62OO1O， China）

Abstract：[Purposes] This study aims to analyze the weather characteristics of southwest vortex rainstorms using FY-4 meteorological satellite remote sensing data，so as to provide references for improving the accuracy of short-term nowcasting of heavy rainfall.[Methods] Taking the southwest vortex rainstorm process in Meishan，Sichuan Province from September 14 to 15，2024 as an example，FY-4 satellite infrared and water vapor cloud images，along with Fengyun Earth satellite products， were used to diagnose and analyze strong convective cloud clusters.[Findings] ① Cloud clusters induced by highaltitude weather systems （low vortex and shear） tend to merge and develop. The detection of growing cloud clusters near high-altitude weather systems via infrared cloud imagery suggests that convection is likelyto develop，warranting heightened attention; ② Water vapor cloud imagery clearly revealsatmosphericregions of ascending and descending motion.Within rainstorm cloud clusters，there is intense large-scale vertical ascent，accompanied by sufficient moisture throughout the atmospheric column， providing favorable hydrological and dynamic conditions for heavy rainfall; ③ Fengyun Earth satellite products are efective in assessing the atmospheric environmental field and interpreting the physical properties of strong convective cloud clusters.[Conclusions] The use ofFY-4 meteorological satelite remote

sensing data can help predict the development of convection， which is of great significance for improving the accuracy of short-term nowcasting of rainstorms.

Keywords：FY-4;satellite cloud imagery;southwest vortex

0 引言

西南涡是我国青藏高原东部特殊地形与大气环流共同作用的结果。（剩余3970字）