HY-2卫星微波散射计在西北太平洋台风监测中的应用研究

Application study of the HY-2 scatterometer on monitoring typhoon events in the northwest Pacific Ocean

本文在简述海洋二号(HY-2)卫星微波散射计工作机制及海面风场反演原理的基础上,针对HY-2卫星微波散射计在轨运行的数据,利用该散射计数据开展海面台风中心定位、结构、台风路径、风速等值线、大风半径等台风参数的定量化应用分析研究。同时将HY-2卫星观测到的海面风场与风云二号(FY-2E)卫星云图进行融合展示,并将HY-2海面风场与ASCAT反演的海面风场和浮标提供的观测数据进行对比验证,多方面的定量分析显示出HY-2卫星海面风场观测的有效性和在台风监测中的优势。最后,对HY-2卫星微波散射计的优缺点进行分析,展望了其可能的改进方向。

HY-2 scatterometer is a spaceborne pencil-beam radar measuring the backscattering coefficient of ocean surface. Firstly,based on the description of the working mechanism and the principle of ocean surface wind retrieval from scatterometer data,quantitative analyses of some of the typhoons captured by HY-2 scatterometer in 2012 were carried out in this paper, which include location of the typhoon center,typhoon structure,path and the radius of maxi-mum wind speed. Secondly,ocean surface wind field was overplayed on the meteorological cloud image acquired by FY-2E satellite to reveal the consistency of spatial structure of these two sources of data. Furthermore,ocean surface wind field from ASCAT was also used to make a contrast to the ocean surface wind field of HY-2 scatterometer. Multi-angle analysis has revealed the validity of ocean surface wind field observation and the advantages of typhoon monitoring by HY-2 scatterometer. Finally,the pros and cons of the HY-2 satellite microwave scatterometer were summarized,and the possible improvements of the HY-2 scatterometer were proposed in this paper.