基于双频段雷达高度计数据的海面阵风反演研究  

Research of sea surface gust inversion by dual band radar altimeter data

作　　者：林静 张有广[2] Lin Jing;Zhang Youguang(National Marine Environmental Forecasting Center,Beijing 100081,China;National Satellite Ocean Application Service,Beijing 100081,China)

机构地区：[1]国家海洋环境预报中心,北京100081 [2]国家卫星海洋应用中心,北京100081

出　　处：《海洋学报》2024年第4期133-142,共10页

基　　金：国家重点研发计划新型海洋观测资料同化技术支撑项目(2021YFC3101502)。

摘　　要：海面阵风是海洋资源开发、海洋防灾减灾和海洋科研等领域所需的重要海洋动力环境信息。但迄今为止,海面阵风观测数据严重缺失,阻碍了阵风预报、应用研究等方面的发展。本文利用双频的HY-2B卫星高度计C、Ku波段的后向散射系数,对现有海面风速(U_(10))进行修正,建立了阵风风速(U_(g))反演算法。反演结果与美国国家浮标数据中心(NDBC)2018-2022年的浮标数据进行真实性检验,相关系数(R)为0.91,均方根误差(RMSE)为1.82 m/s;国外同类卫星Jason-3基于本方法的反演结果与2018-2022年NDBC站点数据进行检验,RMSE优于常规2 m/s精度要求;反演结果与处于不同纬度的近海远洋站点进行个例验证,RMSE均优于2 m/s。因此,本文在现有的HY-2B卫星高度计海面风速观测数据的基础上,利用不同波段信息实现了海面阵风的观测,具有较高的观测精度。同时,该方法也适用于相同观测体制的国外卫星高度计。Sea surface gusts are important marine dynamic environmental information required for the development of marine resources,marine disaster prevention and reduction,and marine scientific research.However,so far,there has been a serious lack of observational data on sea surface gusts,which has hindered the development of gust forecasting,application research,and other aspects.This article uses the backscatter coefficients in the C and Ku bands of the dual frequency HY-2B satellite altimeter to correct the existing sea surface wind speed(U_(10)) and gust wind speed(U_(g)) inversion algorithm.The inversion results were verified for authenticity with the buoy data from the National Buoy Data Center(NDBC) of the United States from 2018 to 2022.The correlation coefficient(R) was 0.91,and the root mean square error(RMSE) was 1.82 m/s;based on the inversion results of this method and the NDBC station data from 2018 to 2022,the RMSE of similar foreign satellites Jason-3 is superior to the conventional 2 m/s accuracy requirement;the inversion results were verified with individual cases of offshore and oceanic stations at different latitudes,and the RMSE was better than 2 m/s.Therefore,based on the existing HY-2B satellite altimeter sea surface wind speed observation data,this article uses different band information to achieve observation of sea surface gusts,which has high observation accuracy.Meanwhile,this method is also applicable to foreign satellite altimeters with the same observation system.

关 键 词：雷达高度计 反演算法 海面阵风 HY-2B卫星 后向散射系数 

分 类 号：P714.2[天文地球—海洋科学]