Improved CYGNSS Wind Speed Retrieval Using Significant Wave Height Correction
Improved CYGNSS Wind Speed Retrieval Using Significant Wave Height Correction
复制标题
使用显着波高修正改进 CYGNSS 风速反演
DOI：
10.3390/rs13214313
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
C. Ruf
中科院分区：
文献类型：
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作者：
D. Pascual;M. Clarizia;C. Ruf
本文介绍了利用有效波高（SWH）信息作为外部参考数据，对气旋全球导航卫星系统（CYGNSS）卫星星座测量的海面风速进行改进估计的方法。该方法由校正二维查找表（LUT）组成，输入：(1)地球物理模型函数（GMF）给出的CYGNSS风速；(2)由欧洲中期天气预报中心（ECMWF）组织的风所推动的WW3模式所提供的参考SWH。分析的CYGNSS风速为gmf3.0获得的完全发达海（FDS），强迫风为ECMWF预报风。结果表明，对大风速的敏感性增加，并且相对于ECMWF风速的均方根差（RMSD）从2.05 m/s减少到1.74 m/s。通过考虑以下相关性，分析了ECMWF风对修正风（由于在WW3模式中使用）的可能影响：(1)ECMWF风与另一个参考资料的风之间的差异；(2)校正后的CYGNSS风向与同一参考点的风向之差。使用ASCAT、WindSat、Jason和AltiKa作为参考，结果显示没有显著影响。
This article presents the methodology for an improved estimation of the sea surface wind speed measured by the cyclone global navigation satellite system (CYGNSS) constellation of satellites using significant wave height (SWH) information as external reference data. The methodology consists of a correcting 2D look-up table (LUT) with inputs: (1) the CYGNSS wind speed given by the geophysical model function (GMF); and (2) the collocated reference SWH given by the WW3 model, which is forced by winds from the European Centre for Medium-Range Weather Forecasts (ECMWF) organization. In particular, the analyzed CYGNSS wind speeds are the fully developed seas (FDS) obtained with the GMF 3.0, and the forcing winds are the ECMWF forecast winds. Results show an increase in sensitivity to large winds speeds and an overall reduction in the root mean square difference (RMSD) with respect to the ECMWF winds from 2.05 m/s to 1.74 m/s. The possible influence of the ECWMF winds on the corrected winds (due to their use in the WW3 model) is analyzed by considering the correlation between: (1) the difference between the ECMWF winds and those from another reference; and (2) the difference between the corrected CYGNSS winds and those from the same reference. Results using ASCAT, WindSat, Jason, and AltiKa as references show no significant influence.