韶关地区台风强降雨的成因分析
Analysis of the Causes of Typhoon-Induced Heavy Rainfall in the Shaoguan Region

利用NCEP再分析资料、地面观测资料和中国气象局热带气旋最佳路径数据集，统计了2000~2021年间登陆华南地区台风的气候特征，分析了相似路径下造成韶关强降雨的成因，结果表明：1) 近20年间平均每年有5.59个台风登陆华南，登陆时以热带风暴级别居多。2) 给韶关带来降雨的台风路径主要有三类，分别为在福建登陆后西行路径、在广东登陆后北上路径以及在珠江口附近登陆后稳定西北行路径。3) 台风移速较慢影响时间较长、配合强烈的低层辐合和高层辐散且低层有持续的水汽输送时，将给韶关带来强降雨。4) 在台风影响期间，若叠加弱冷空气的渗透作用及低层假相当位温的平流输送，将加强本地的降雨强度。
Using NCEP reanalysis data, surface observation data, and the China Meteorological Administration Tropical Cyclone Best Track Dataset, this study conducted statistical analysis on the climatic characteristics of typhoons making landfall in South China between 2000 and 2021, with particular focus on the mechanisms underlying heavy rainfall in Shaoguan under similar typhoon tracks. The results indicate: 1) An average of 5.59 typhoons annually made landfall in South China over the past two decades, predominantly at tropical storm intensity. 2) Three primary typhoon track types contribute to rainfall in Shaoguan: westward tracks after Fujian landfall, northward tracks post-Guangdong landfall, and stable northwestward tracks following landfall near the Pearl River Estuary. 3) Slow-moving typhoons with prolonged influence, combined with strong low-level convergence, upper-level divergence, and sustained low-level moisture transport, tend to generate heavy rainfall in Shaoguan. 4) The superimposition of weak cold air infiltration and low-level equivalent potential temperature advection during typhoon impacts can further enhance local precipitation intensity.