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Comparison of the application of co- and cross-polarized sentinel-1 synthetic aperture radar data to tropical cyclone evaluation

2021; Taylor & Francis; Volume: 12; Issue: 3 Linguagem: Inglês

10.1080/2150704x.2020.1843734

2150-7058

Lin Zhu, Xupu Geng, Ting Xie, Liping Hu, Xiao-Hai Yan,

Coastal and Marine Dynamics

Spaceborne synthetic aperture radar (SAR) is considered one of the most powerful sensors for tropical cyclone assessment. In this study, 14 tropical cyclone (TC) events captured by the Sentinel-1A/B satellite are collected to compare the similarities, differences and quantitative relationships between co- and cross-polarization SAR applications for tropical cyclone evaluation. This study uses multiple co-polarized C-band geophysical model functions (GMFs) and cross-polarized ocean backscatter models, including a C-band Cross-Polarized Ocean Backscatter (C-2PO) model and a C-band Cross-Polarization Coupled-Parameters Ocean (C-3PO) model to estimate the sea surface tropical cyclone wind field. The results reveal that the structure values of the wind circle radius by co-polarization SAR wind inversion are similar to those of cross-polarization. The combination of the two polarization modes can get a more accurate estimation on tropical cyclone rating of the intensity level and hazard of the potential tropical cyclone damages. In addition, a corresponding formula with a correlation coefficient of 0.677 between co- and cross-polarization at 10-km resolution is obtained.