基于卫星微波散射计风场的台风中心定位方法比较研究  

Comparative study on typhoon center locating based on satellite microwave scatterometer wind field

作　　者：王晓霞 刘建强[1] 张毅[1,2] 徐雅梦 WANG Xiao-xia;LIU Jian-qiang;ZHANG Yi;XU Ya-meng(National Satellite Ocean Application Service,Beijing 100081 China;Southern Marine Science and Engineering Guangdong Laboratory,Guangzhou 511458 China;China University of Mining and Technology,College of Geoscience and Surveying Engineering,Beijing 100083 China)

机构地区：[1]国家卫星海洋应用中心,北京100081 [2]南方海洋科学与工程广东省实验室(广州),广东广州511458 [3]中国矿业大学地球科学与测绘工程学院,北京100083

出　　处：《海洋预报》2020年第5期24-33,共10页Marine Forecasts

基　　金：“全球变化与海气相互作用”专项(GASI-02-PAC-YGST2-02);南方海洋科学与工程广东省实验室(广州)人才团队引进重大专项(GML2019ZD0302)。

摘　　要：基于HY-2A/B、Metop-A卫星微波散射计风场产品,开展了两种定位台风中心方法的比较研究。以2019年台风"娜基莉"为例,分析了在台风形成期与成熟期不同发展阶段的定位结果。结合台风风场涡旋特性与风速特征,考虑相对垂直涡度和水平散度两个影响因子,探究了高风速阈值涡度场定位法和高风速阈值复合场定位法的定位效果,并与中国气象局热带气旋资料中心的最佳路径数据集比较。结果表明:台风成熟期定位精度较形成期更优,高风速阈值复合场定位法精度更佳,平均偏差为0.1°~0.2°,均方根误差小于0.25°。This paper conducts a comparative study of two methods of typhoon center locating based on HY-2A/2B and Metop-A satellite microwave scatterometer wind field products.Taking the typhoon“Nakri”in 2019 as an example,we analyze the locating results of typhoon center in the typhoon formation and mature stage.By considering the characteristics of wind field vortex and the wind speed and two influence factors of vertical vortex and horizontal divergence,we discuss the performance of two locating methods based on the vorticity field and composite field of the high wind speed threshold.The performance is compared with the best track dataset of the China Meteorological Administration Tropical Cyclone Database.The results show that the locating accuracy of the typhoon center is higher in the development stage compared to the mature stage,and locating method based on the composite field of the high wind speed threshold reveals higher accuracy with the average deviation of 0.1°~0.2°and root mean square error of less than 0.25°.

关 键 词：台风中心定位 高风速阈值 涡度场 复合场 

分 类 号：P714.2[天文地球—海洋科学]