沙漠与绿洲气象2025，Vol.19Issue(1)：68-76,9.DOI:10.12057/j.issn.1002-0799.2311.01001
热带气旋"弗雷迪"特征及强降水成因初步分析
Characteristics of Tropical Cyclone"Freddy"and the Causes of Heavy Rainfall
摘要
Abstract
Using multi-source global station and grid monitoring data,FY-2H satellite data,and ERA5 reanalysis data,this study analyzes the lifecycle and precipitation characteristics of tropical cyclone"Freddy",as well as the causes of heavy rainfall in southern Mozambique.The results show that"Freddy"had a lifespan of 36 days,making it the longest-lived tropical cyclone in the world and the tropical cyclone with the widest latitude span in the Southern Hemisphere.The cyclone made three landfalls,bringing sustained heavy rainfall and severe flooding to countries in Southeastern Africa.In particular,the southern part of Mozambique experienced rainfall with characteristics such as long duration,concentrated areas,and large accumulated amounts.After making landfall in Mozambique,"Freddy"was located in a saddle region,which led to weakened steering winds.Combined with upper-level divergence and the sustained transport of warm,moist airflow by a low-level jet,the large-scale circulation systems provided favorable conditions for the cyclone's slow movement and persistence.The development of convergence and vorticity bands in the lower troposphere,along with strong and sustained water vapor transport,contributed to the prolonged heavy rainfall in Mozambique.Additionally,the intrusion of cold air induced the formation of a high-gradient zone of pseudo-equivalent potential temperature in southern Mozambique.The cold air in the middle layer enhanced atmospheric instability,which facilitated the development of convection.The southern part of Mozambique was continuously affected by multiple mesoscale convective systems,which not only increased precipitation efficiency but also prolonged the duration of the rainfall.关键词
"弗雷迪"/莫桑比克/强降水/冷空气/MCSKey words
Freddy/Mozambique/heavy precipitation/cold air/MCS分类
天文与地球科学引用本文复制引用
杨舒楠,孟庆涛,王皘,姚燕,田林..热带气旋"弗雷迪"特征及强降水成因初步分析[J].沙漠与绿洲气象,2025,19(1):68-76,9.基金项目
国家重点研发计划揭榜挂帅项目(2022YFC3090602) （2022YFC3090602）
亚洲合作资金项目:澜湄流域灾害性天气监测预报及其对洪旱、生态农业影响技术应用 （）
