摘要
本文利用CMA-STI最佳路径资料、气象站降水资料、ERA5再分析资料等研究首登台湾地区二登福建台风对台州降水影响。根据台风对台州降水影响程度,将首登台湾地区二登福建台风分为强降水类、中等强度降水类、弱降水类,三类台风给台州带来的降水分布形态较一致,但量级上差异明显。对比三类台风自身登陆特征,发现强降水类台风登台湾岛时平均强度最强,过台湾岛平均强度耗损最大,二登福建时平均强度最强。台风环流影响下,沿海有较强暖平流,台州地区持续时间超过48 h以上、最强可达25 m/s以上的东风或东南风急流配合底层到200 hPa为高湿区的深厚水汽条件、低层辐合中层或高层辐散条件、中层有较强垂直上升运动条件、低层有强水汽通量辐合中心将产生较强雨强,带来强降水。另外,地形对降水有增幅作用,强降水类台风台州山区降水是平原地区的1.5~3.0倍。
By using the CMA-STI best track data,precipitation data from medium-scale automatic meteorological stations in Taizhou and the ERA5 reanalysis data,the precipitation in Taizhou of the first landing in Taiwan region and the second landing in Fujian typhoons was analyzed.According to the precipitation in Taizhou,the typhoons were divided into three categories:heavy precipitation type,moderate precipitation type,and weak precipitation type.The distribution patterns of precipitation of different types were relatively consistent,but the magnitudes were significantly different.Comparing the characteristics of the three types,found that the heavy precipitation typhoons were first,that the average intensity of landing on Taiwan region was the strongest,the average intensity loss across Taiwan Island was the largest,and the average intensity of the second landing on Fujian was the strongest.Under the influence of typhoon circulation,there was strong warm advection along the coast,the east or southeast wind jet lasting more than 48 hours and larger than 25 m/s in Taizhou with the deep water vapor conditions from bottom layer to 200 hPa,the low-level convergence and the middle or high level dispersion conditions,the strong vertical upward movement conditions in the middle layer,and the strong water vapor flux convergence center in the lower layer,that would produce strong precipitation.In addition,the topography had an increasing effect on precipitation,and the precipitation in the mountainous areas of Taizhou under the heavy precipitation type was 1.5-3.0 times that of the plain area.
作者
倪钟萍
魏雪
王斌
裘杭培
Ni Zhongping;Wei Xue;Wang Bin;Qiu Hangpei(Taizhou Meteorological Bureau,Taizhou 318001,Zhejiang,China)
出处
《科技通报》
2023年第12期5-15,共11页
Bulletin of Science and Technology
基金
浙江省气象局青年项目(2020QN39)。
关键词
二次登陆
福建
强度耗损
台州
降水
second landfall
Fujian
strength loss
Taizhou
precipitation
作者简介
倪钟萍(1987-),女,浙江桐乡人,硕士,高级工程师,主要从事天气预报和研究工作。E-mail:violet0044@163.com。
