两次西风槽影响下北上台风导致的强降水对比分析-海洋预报

两次西风槽影响下北上台风导致的强降水对比分析

单位：天津市气象台, 天津 300074

分类号：P444

出版年·卷·期（页码）：2023·40·第四期（83-96）

摘要：

利用台风最佳路径数据、逐时自动站资料、美国国家环境预报中心/美国国家大气研究中心（NCEP/NCAR）1°×1°再分析资料、FY-4A卫星的云顶亮温和常规观测资料，对比分析了2106号台风“烟花”和1810号台风“安比”在北上过程中受到西风带高空槽影响导致天津地区强降水落区产生差异的原因。结果表明：两次台风在北上过程中，均受到高空槽和冷空气的影响，但是由于台风结构不同，西风槽和北上台风结合后引发的暴雨位置和强度有所区别。台风“安比”维持正压结构，降水持续时间短、降水强度大，大暴雨主要集中在天津西部；而台风“烟花”存在斜压性，降水持续时间长、效率低，大暴雨主要位于天津东部。在台风“安比”期间，副热带高压东撤，槽后冷空气渗透与偏东南暖湿低空急流交汇共同导致大气层结向不稳定状态发展，中尺度云团发展，正涡度强度明显增大，高层高位涡气流到达对流层低层，位涡下传引起低层位涡增大，强降水与对流层低层螺旋度中心、锋区以及偏东水汽输送关系密切；而台风“烟花”与西风槽合并后中尺度云团不明显，暴雨区西侧和北侧的θ_se密集带发生倾斜，斜压性增强，强降水站点主要位于锋生函数和假相当位温的梯度区，偏南水汽输送为持续降水提供水汽来源，降水的雨强较小，以稳定性降水为主。

Based on typhoon best track data, hourly automatic weather station data, National Centers for Environmental Prediction/ National Center for Atmospheric Research (NCEP/NCAR) 1°×1° reanalysis data, cloud top brightness temperature data from FY-4A satellite and conventional observation data, a comparative analysis of heavy precipitation in Tianjin during Typhoon “In-Fa” (2106) and Typhoon “Ampil” (1810) is conducted in this study, specifically both these two northward-moving typhoons were affected by high-altitude trough in the westerly belt. The results show that the two typhoons were both affected by high-altitude troughs and cold air during their northward movement. However, due to the different typhoon structure, location and intensity of the rainstorm are different after the two typhoons encounter the westerly trough. Typhoon "Ampil" maintained a barotropic structure, thus the associated precipitation had a short duration and high intensity, and the heavy rainstorm mainly located in the western Tianjin. However, Typhoon "In-Fa" had a baroclinic property, and the associated precipitation had a long duration and low intensity, and the heavy rainstorm mainly located in the eastern Tianjin. During the northward movement of Typhoon "Ampil", the subtropical high moved eastward, which was conducive to convergence of the cold air behind the trough and the warm-humid low-level jet from the southeast, leading to the development of atmospheric stratification instability and mesoscale cloud clusters. The high-level high potential vortex air flow reached the lower troposphere, and the downward propagation of the potential vortex caused the increases of the low-level potential vortex. Heavy rainfall is closely related to the helicity center, frontal zone and easterly water vapor transport in the lower troposphere. Typhoon "In-Fa" merged with the westerly trough and evolved into a high-altitude trough, but the mesoscale cloud clusters were not obvious, and the dense belts of θ_se on the west and north sides of the heavy rain area inclined. Heavy rainfall mainly located in the gradient area of frontogenesis function and pseudo-equivalent potential temperature. The southerly water vapor transport provided the source for continuous precipitation. The associated precipitation was characterized by low intensity and high stability.

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