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基于组网多普勒雷达径向速度场的福建近海台风中心定位研究
苏源, 倪悦, 曾凡辉, 张深寿
龙岩市气象局,福建龙岩364000
摘要:
本文探讨了一种基于组网多普勒雷达径向速度零速度线(区)对福建近海台风中心定位的方法,该方法利用了台风中心位于雷达径向速度产品中零速度线(区)上的特征,理论上可以将两部(或以上)多普勒雷达零速度线(区)的重合点(或区域)认定为台风中心,并利用空间密度聚类法和线性回归分析对台风零速度线(区)弯曲、不连续以及重合点不唯一等情况做进一步中心定位判定。研究发现,该方法时空分辨率高、定位精准,可以对发展形态不规则、速度模糊、临近登陆或登陆后的台风实现定位,对台风实时业务定位和路径预报等具有一定的参考价值,同时具有简单易行、适用范围广的优势。
关键词:  台风中心定位  多普勒雷达  组网  径向速度  零速度线
DOI:10.16032/j.issn.1004-4965.2024.018
分类号:
基金项目:
Offshore Tropical Cyclone Locating Method for Fujian Based on Network Doppler Radial Velocity Field
SU Yuan, NI Yue, ZENG Fanhui, ZHANG Shenshou
Longyan Meteorological Bureau ,Longyan ,Fujian 364000 ,China
Abstract:
This paper discussed a novel method for locating the center of offshore tropical cyclones in Fujian using the zero velocity line (or zone )in the radial velocity field of networked Doppler radars .This method was based on the fact that the typhoon center is invariably located on the zero velocity line (or zone),as depicted in the radar ’s radial velocity diagram .The intersection (or the vicinity of the intersection )of the zero velocity line of two or more Doppler radars was identified as the typhoon center . The results showed that this method has high spatial and temporal resolution ,and the locations identified are basically consistent with the results from the China Meteorological Administration ,thus providing valuable insights for real-time typhoon positioning and forecasting .This method provides a feasible way to navigate the challenges posed by the irregularity of typhoon reflectivity echo shape and velocity ambiguity , enabling quick and accurate positioning of the typhoon ’s center as it approaches or makes landfall .
Key words:  typhoon positioning ,Doppler radar ,networking ,radial velocity ,zero velocity line
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