中法海洋卫星微波散射计风场产品精度评价  

Evaluation of accuracy of CSCAT wind vector data

作　　者：穆博[1,2] 郎姝燕 卫然[1,2] 孙从容 杨晟 MU Bo;LANG Shuyan;WEI Ran;SUN Congrong;YANG Sheng(National Satellite Ocean Application Service,Beijing 100081,China;Key Laboratory of Space Ocean Remote Sensing and Applications,Ministry of Natural Resources,Beijing 100081,China)

机构地区：[1]国家卫星海洋应用中心,北京100081 [2]自然资源部空间海洋遥感与应用重点实验室,北京100081

出　　处：《海洋气象学报》2024年第4期22-29,共8页Journal of Marine Meteorology

基　　金：国家重点研发计划项目(2021YFC3101502)。

摘　　要：中法海洋卫星(China-France Oceanography SATellite,CFOSAT)搭载的微波散射计(SCATterometer,简记为“CSCAT”)首次采用扇形波束旋转扫描观测体制,相比笔形波束旋转扫描体制,可以实现海表同一面元的多入射角观测,具备更高精度海面风场的观测能力。CSCAT的原始空间分辨率可达10.0 km×12.5 km,生产了两种空间分辨率产品:25.0 km标准产品和12.5 km近岸产品。文中给出了CSCAT两种空间分辨率产品业务化真实性检验评估结果,研究表明采用美国国家数据浮标中心(National Data Buoy Center,NDBC)浮标得到CSCAT风速均方根误差小于1 m·s^(-1),风向均方根误差小于17°。采用ERA5再分析资料对CSCAT两种空间分辨率的风场产品在不同风速、交轨方向不同位置条件下的精度特征进行了分析,同时也对CSCAT数据处理中风向去模糊解的能力进行了分析。结果显示,标准产品的精度要高于近岸产品,对于产品精度需求更高的用户,建议使用25.0 km标准产品。因此,业务化真实性检验评估对CSCAT在轨运行期间的性能监测具有非常重要的价值,也有助于用户更全面地了解CSCAT风场产品的精度特性,促进CSCAT海面风场产品的定量化应用。The China-France Oceanography SATellite(CFOSAT)SCATterometer,namely CSCAT,firstly adopts a new observing scheme of Ku-band fan-beam rotary scanning system,measures the same wind vector cell from more incidence angles,and thus improves the accuracy of sea surface wind observations in contrast with the pencil-beam rotary scanning system.Based on the raw spatial resolution of 10.0 km×12.5 km,the standard product of 25.0 km and coast product of 12.5 km are processed.Referencing the validation technology system,this paper presents the validation results of the two CSCAT products.The validation results show that compared with the data of NDBC(National Data Buoy Center)buoys,the root mean square error of CSCAT wind speed and wind direction is less than 1 m·s^(-1) and 17°,respectively.ERA5 reanalysis data is used to analyze the accuracy characteristics of the two different resolution products with different wind speeds and cross-track locations of the wind vector cells.At the same time,the ambiguity removal ability of CSCAT wind field products is analyzed.The comparison of accuracy characteristics shows that the accuracy of the standard product is better than that of the coast product.If users are more concerned about product accuracy,the standard product is recommended.So,the evaluations by the validation technology system are important for the performance monitoring of CSCAT during on-orbit operation,help users to fully understand the accuracy characteristics of CSCAT wind products,and promote the quantitative application of CSCAT wind products.

关 键 词：中法海洋卫星(CFOSAT) 微波散射计 中法散射计(CSCAT) 海面风场 真实性检验 

分 类 号：V474[航空宇航科学与技术—飞行器设计] P732.1[天文地球—海洋科学]