Abstract
Sentinel-1A/B satellites operating in wave mode provide ocean winds dataset on a continuous and global basis. In this study, wind speeds derived from Sentinel-1A/B wave mode imagery from November 2018 to October 2020 are evaluated against HSCAT scatterometer aboard Chinese satellite HY-2B. Here, due to the close equatorial crossing times between Sentinel-1 and HY-2B, the spatio-temporal criteria of 50 km and 30 min yield large amount match-ups. Comparison results show a good agreement between wind speeds derived from the two types of radars: synthetic aperture radar and scatterometer. Impact of the presence of pure swell on the evaluation results is also discussed.
Highlights
Observations of ocean winds are important for various scientific and engineering areas
The match-up dataset was built by col-locating the Sentinel-1A/B and HY-2B HSCAT within the spatio-temporal criteria of 25 km and 30 min, respectively
We investigate the influence of synthetic aperture radar (SAR) radar incidence angle on the validation results
Summary
Observations of ocean winds are important for various scientific and engineering areas. It is evident that ocean swell is a factor impacting wind speed retrieval from C-band SARs. The main mechanism for this is that the large-scale waves (e.g., the long-period swells) impacts the small-scale roughness deduced by winds, changes the radar backscattering over the ocean [4][5]. The main mechanism for this is that the large-scale waves (e.g., the long-period swells) impacts the small-scale roughness deduced by winds, changes the radar backscattering over the ocean [4][5] In this context, some efforts have been devoted for the performance assessment of winds derived from Sentinel-1 SAR imagery (e.g., [6][7]), the SAR winds quality assessment under complex non-wind background, for instance swells, is still needed detailed studies.
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