X-band COSMO-SkyMed wind field retrieval, with application to coastal circulation modeling

摘要

In this paper, X-band COSMO-SkyMed© synthetic\udaperture radar (SAR) wind field retrieval is investigated,\udand the obtained data are used to force a coastal ocean\udcirculation model. The SAR data set consists of 60 X-band\udLevel 1B Multi-Look Ground Detected ScanSAR Huge Region\udCOSMO-SkyMed© SAR data, gathered in the southern\udTyrrhenian Sea during the summer and winter seasons\udof 2010. The SAR-based wind vector field estimation is accomplished\udby resolving both the SAR-based wind speed and\udwind direction retrieval problems independently. The sea surface\udwind speed is retrieved by means of a SAR wind speed\udalgorithm based on the azimuth cut-off procedure, while the\udsea surface wind direction is provided by means of a SAR\udwind direction algorithm based on the discrete wavelet transform\udmulti-resolution analysis. The obtained wind fields are\udcompared with ground truth data provided by both ASCAT\udscatterometer and ECMWF model wind fields. SAR-derived\udwind vector fields and ECMWF model wind data are used to\udconstruct a blended wind product regularly sampled in both\udspace and time, which is then used to force a coastal circulation\udmodel of a southern Tyrrhenian coastal area to simulate\udwind-driven circulation processes. The modeling results\udshow that X-band COSMO-SkyMed© SAR data can be valuable\udin providing effective wind fields for coastal circulation\udmodeling.