CYGNSS卫星风速产品的精度检验

针对 CYGNSS卫星风速产品的适用性问题,以美国国家数据浮标中心(NDBC)的实测风速与美国国家飓风中心(NHC)的最佳路径风速为参照,选取美国西南部海域为研究区,通过数据匹配和对比分析,评估了CYGNSS不同模型估算风速产品的精度。结果表明,CYGNSS FDS模型估算的中、低风速产品与NDBC浮标实测风速具有较好的一致性,CYGNSS风速与浮标风速的差异在春夏季稍高、秋冬季略低;CYGNSS YSLF模型估算的高风速产品与NHC最大风速存在较大差异,CYGNSS风速低于NHC最大风速;对于CYGNSS两种模型估算的风速产品,利用遥感观测量NBRCS反演出的风速都比LES反演出的风速具有更好的精度。总体而言,本研究验证了CYGNSS风速产品的真实有效性,对提高海洋数值预报能力具有一定的意义。

Accuracy validation on wind speed products of CYGNSS satellite

In view of the applicability of CYGNSS satellite wind speed products,taking the measured wind speed of the National Data Buoy Center (NDBC) and the best track wind speed of the National Hurricane Center (NHC) as a reference,the southwest of the United States was selected as the study area.The accuracy of CYGNSS wind speed products estimated by different models were evaluated through data matching and comparative analysis.The results indicate that the middle and low wind speed estimated by CYGNSS FDS model are in good agreement with the measured wind speed of NDBC.The seasonal accuracy of CYGNSS wind speed products is slightly higher in spring and summer,but lower in autumn and winter.The high wind speed estimated by CYGNSS YSLF model are quite different from the maximum wind speed of NHC.The wind speed of CYGNSS is lower than the maximum wind speed of NHC;For the CYGNSS wind speed products estimated by two models,the wind speed inversed by NBRCS observed by remote sensing has better accuracy than that inversed by LES.Overall,this study verifies the authenticity and effectiveness of CYGNSS wind speed products,which is of great significance to improve the ability of marine numerical prediction.