浙江沿海两个台风暴雨环流过程的对比分析  

Comparison of Synoptic Circulations of Rainstorm Associated with Two Typhoons over Zhejiang Coast

作　　者：包家玲 王郭琪 何欢然 黄伟 于梦颖 陶烨明 BAO Jialing;WANG Guoqi;HE Huanran;HUANG Wei;YU Mengying;TAO Yeming(Meteorological Observatory of Daishan County,Daishan Zhejiang 316200)

机构地区：[1]岱山县气象台,浙江岱山316200

出　　处：《现代农业科技》2024年第6期107-112,共6页Modern Agricultural Science and Technology

摘　　要：“烟花”和“梅花”是两个均在浙江舟山登陆,并在浙江沿海产生强降水的热带气旋。本文利用常规气象站观测资料和ERA5再分析资料,对两个台风影响浙江沿海并造成台风暴雨的成因进行对比分析。结果表明:①“烟花”受多系统、缺少明确引导气流环境的影响,移动缓慢,降水时间长;“梅花”受冷空气南下渗透影响,台风变性,多集中性暴雨发生。②“烟花”有两条水汽输送带和两个明显的水汽辐合区,为长时间暴雨提供充足水汽;“梅花”只有一条水汽输送通道,但有一个相较“烟花”更加强烈的水汽辐合区,使暴雨落区更加集中,雨强更大。③“烟花”受长时间低层暖湿气流和垂直风切变维持的影响,降水时间长,但强度较弱;“梅花”影响期间,上升运动强烈,降水效率高,降水多由短时暴雨形成。In-Fa and Muifa were two tropical cyclones(TC)that both made landfall in Zhoushan of Zhejiang and produced rainstorm along the Zhejiang coast.Using the conventional weather station observation data and the ERA5 reanalysis data,this paper compared and analyzed the causes of two typhoons affecting Zhejiang coast and causing typhoon rainstorm.The results showed that,①Affected by multi-system and lack of clear guiding air flow environment,In-Fa moved slowly and had a long precipitation time.Affected by southward infiltration of cold air,Muifa became degeneration,which led to the occurrence of concentrated rainstorms.②In-Fa had two water-vapor conveyor belts and two distinct water-vapor convergence zones,which provided sufficient moisture for long periods of rainstorm.Muifa had only one water-vapor channel,but there was a more intense water-vapor convergence zone than In-Fa,which made the rainstorm fall area more concentrated and the rain more intense.③In-Fa was affected by the long-term low-level warm and wet air current and the vertical wind shear maintenance,the precipitation time was long,but the precipitation intensity was weak.During the period of Muifa influence,the upward movement was strong and the precipitation efficiency was high,and the precipitation was mostly formed by short-term rainstorm.

关 键 词：台风 暴雨落区 环流形势 物理量场 浙江沿海 

分 类 号：P448[天文地球—大气科学及气象学]