Estimating Tropical Cyclone Wind Structure and Intensity From Spaceborne Radiometer and Synthetic Aperture Radar

We present a relatively simple method to estimate tropical cyclone (TC) surface wind structure (34-, 50-, and 64-kt radii) intensity [maximum speed (MWS)] from fields acquired the L-band SMAP radiometer C-band Sentinel-1A/B RADARSAT-2 synthetic aperture radar (SAR) between 2015 2020. The SAR-derived radii MWS are systematically compared with best-track estimates. root-mean-square errors (RMSEs) of R34, R50, R64 31.2, 21.8, 17.0 nmi (1 = 1.852 km) for radiometer, 21.7, 16.5, 16.3 SAR, respectively. These error values smaller than averaged uncertainty estimates three radii. Compared reports, bias RMSE -0.2 m/s 5.8 4.4 9.1 results speeds in range 17-80 m/s. For two typical TCs (Lionrock Noru) Northwest Pacific Ocean, our show that combination SAR data within very short time interval has potential simultaneously obtain reasonable measurements parameters. Moreover, TC long lifecycle, such as Typhoon Noru, we demonstrate high-resolution multitemporal synergistic observations valuable studying fine-scale features field characteristics asymmetry associated change, well evolution intensity.