Validation of Sea Surface Winds From the Space-Borne Radiometer COWVR

IF 4.7 2区地球科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing Pub Date : 2025-04-28 DOI:10.1109/JSTARS.2025.3564966

Luo Zhou;Zhixiong Wang;Naiqiang Zhang;Jianhua Qu

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Abstract

This study aims to validate sea surface wind data derived from the compact ocean wind vector radiometer (COWVR) onboard the International Space Station. The COWVR, a fully polarimetric and two-look microwave radiometer, provides wind direction and speed retrievals in rain-free conditions. Validation was performed by comparing COWVR data with traditional radiometer (AMSR-2, GMI), scatterometer (MetOp/ASCAT, HY-2/SCAT), numerical weather prediction (ERA5), and buoy data. The results show that COWVR wind speed retrievals are comparable to those of AMSR-2 and GMI, with an overall wind speed bias close to zero and a standard deviation of 1.18 m/s when compared to ERA5. The COWVR also demonstrates good accuracy in wind direction retrievals for wind speeds above 8 m/s, with root mean square errors of 12.5° and 15.1° for ERA5 and buoy comparisons, respectively. These findings suggest that COWVR can provide good sea surface wind products. However, the inconsistencies of radiometer and scatteromers sea surface wind speeds are still significant, especially for winds above 15 m/s.

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星载辐射计对海面风的验证

本研究旨在验证由国际空间站上的紧凑型海洋风矢量辐射计（COWVR）获得的海面风数据。COWVR是一种完全极化和双面微波辐射计，可在无雨条件下提供风向和风速检索。通过将COWVR数据与传统辐射计（AMSR-2、GMI）、散射计（MetOp/ASCAT、HY-2/SCAT）、数值天气预报（ERA5）和浮标数据进行对比验证。结果表明，COWVR的风速反演结果与AMSR-2和GMI相当，总体风速偏差接近于零，与ERA5的标准差为1.18 m/s。在风速大于8 m/s的情况下，COWVR在风向反演方面也表现出良好的精度，ERA5和浮标对比的均方根误差分别为12.5°和15.1°。这些结果表明，COWVR可以提供良好的海面风产品。然而，辐射计和散射体海面风速的不一致性仍然显著，特别是风速大于15 m/s。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing 地学-成像科学与照相技术

CiteScore

9.30

自引率

10.90%

发文量

563

审稿时长

4.7 months

期刊介绍： The IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing addresses the growing field of applications in Earth observations and remote sensing, and also provides a venue for the rapidly expanding special issues that are being sponsored by the IEEE Geosciences and Remote Sensing Society. The journal draws upon the experience of the highly successful “IEEE Transactions on Geoscience and Remote Sensing” and provide a complementary medium for the wide range of topics in applied earth observations. The ‘Applications’ areas encompasses the societal benefit areas of the Global Earth Observations Systems of Systems (GEOSS) program. Through deliberations over two years, ministers from 50 countries agreed to identify nine areas where Earth observation could positively impact the quality of life and health of their respective countries. Some of these are areas not traditionally addressed in the IEEE context. These include biodiversity, health and climate. Yet it is the skill sets of IEEE members, in areas such as observations, communications, computers, signal processing, standards and ocean engineering, that form the technical underpinnings of GEOSS. Thus, the Journal attracts a broad range of interests that serves both present members in new ways and expands the IEEE visibility into new areas.