Comparison of CYGNSS and Jason-3 Wind Speed Measurements via Gaussian Processes
Comparison of CYGNSS and Jason-3 Wind Speed Measurements via Gaussian Processes
复制标题
通过高斯过程进行 CYGNSS 和 Jason-3 风速测量的比较
DOI:
10.1080/26941899.2023.2194349
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发表时间:
2023
期刊:
影响因子:
--
通讯作者:
Guinness, Joseph
中科院分区:
文献类型:
--
作者:
Bekerman, William;Guinness, Joseph
Wind is a critical component of the Earth system and has unmistakable impacts on everyday life. The CYGNSS satellite mission improves observational coverage of ocean windsviaa fleet of eight micro-satellites that use reflected GNSS signals to infer surface wind speed. We present analyses characterizing variability in wind speed measurements among the eight CYGNSS satellites and between antennas, using a Gaussian process model that leverages comparisons between CYGNSS and Jason-3 during a one-year period from September 2019 to September 2020. The CYGNSS sensors exhibit a range of biases, mostly between −1.0 m/s and +0.2 m/s with respect to Jason-3, indicating that some CYGNSS sensors are biased with respect to one another and with respect to Jason-3. The biases between the starboard and port antennas within a CYGNSS satellite are smaller. Our results are consistent with, yet sharper than, a more traditional paired comparison analysis. We also explore the possibility that the bias depends on wind speed, finding some evidence that CYGNSS satellites have positive biases with respect to Jason-3 at low wind speeds. However, we argue that there are subtle issues associated with estimating wind speed-dependent biases, so additional careful statistical modeling and analysis is warranted.
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