Wind Speed Retrieval Using Global Precipitation Measurement Dual-Frequency Precipitation Radar Ka-Band Data at Low Incidence Angles
Wind Speed Retrieval Using Global Precipitation Measurement Dual-Frequency Precipitation Radar Ka-Band Data at Low Incidence Angles
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DOI：
10.3390/rs14061454
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发表时间：
2022-03
期刊：
影响因子：
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通讯作者：
Chong Jiang;L. Ren;Jingsong Yang;Qing Xu;J. Dai
中科院分区：
文献类型：
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作者：
Chong Jiang;L. Ren;Jingsong Yang;Qing Xu;J. Dai
在这项研究中，使用全球降水测量（GPM）双频降水雷达（DPR）Ka波段数据反演海面风速。为了建立Ka波段低入射角模式，首先分析了DPR Ka波段归一化雷达散射截面（NRCS）与风速、入射角、海面温度（SST）、有效波高（SWH）和海面流速（CSPD）的关系。我们证实了归一化雷达散射截面取决于风速，入射角，和SST。其次，建立了小攻角下的经验模型。该模型将Ka波段NRCS与入射角、风速和SST联系起来。此外，风速检索模型，并通过GPM微波成像仪（GMI）风产品进行验证。验证得到的均方根误差（RMSE）为1.45 m/s，RMSE在较低的入射角和较高的SST下更好。该模式可以扩大GPMDPR资料的应用范围，丰富海面风速资料。这对今后Ka波段星载雷达在低入射角下的风速测量也有一定的借鉴意义。
In this study, sea surface wind speed was retrieved using the Global Precipitation Measurement (GPM) dual-frequency precipitation radar (DPR) Ka-band data. In order to establish the Ka-band model at low incidence angles, the dependence of the DPR Ka-band normalized radar cross section (NRCS) on the wind speed, incidence angle, sea surface temperature (SST), significant wave height (SWH), and sea surface current speed (CSPD) was analyzed first. We confirmed that the normalized radar cross section depends on the wind speed, incidence angle, and SST. Second, an empirical model at low incidence angles was established. This model links the Ka-band NRCS to the incidence angle, wind speed, and SST. Additionally, the wind speed was retrieved by the model and was validated via the GPM Microwave Imager (GMI) wind product. The validation yielded a root mean square error (RMSE) of 1.45 m/s and the RMSE was better at a lower incidence angle and a higher SST. This model may expand the use of GPM DPR data in enriching the sea surface wind speed data set. It is also helpful for other Ka-band spaceborne radars at low incidence angles to measure wind speed in the future.