FN Archimer Export Format
PT J
TI Extensive high-resolution Synthetic Aperture Radar (SAR) data analysis of Tropical Cyclones: comparisons with SFMR flights and Best-Track
BT 
AF Combot, Clement
   Mouche, Alexis
   Knaff, John
   Zhao, Yili
   Zhao, Yuan
   Vinour, Leo
   Quilfen, Yves
   Chapron, Bertrand
AS 1:1;2:1;3:2;4:1;5:1;6:1;7:1;8:1;
FF 1:;2:PDG-ODE-LOPS-SIAM;3:;4:;5:;6:PDG-ODE-LOPS-SIAM;7:PDG-ODE-LOPS-SIAM;8:PDG-ODE-LOPS-SIAM;
C1 Laboratoire d’Océanographie Physique et Spatiale, Institut Français de Recherche pour l’Exploitation de la Mer, Plouzané, France
   NOAA/NESDIS Regional and Mesoscale Meteorological Branch, Fort Collins, Colorado, USA
C2 IFREMER, FRANCE
   NOAA, USA
SI BREST
SE PDG-ODE-LOPS-SIAM
UM LOPS
IN WOS Ifremer UMR
   copubli-france
   copubli-int-hors-europe
IF 3.735
TC 43
UR https://archimer.ifremer.fr/doc/00654/76589/77738.pdf
LA English
DT Article
DE ;Hurricanes;typhoons;Tropical cyclones;Wind;Algorithms;Remote sensing;Satellite observations
AB To produce more precise descriptions of air-sea exchanges under Tropical Cyclones (TCs), spaceborne Synthetic Aperture Radar (SAR) instruments provide unique capabilities to probe the ocean surface conditions, at very high spatial resolution, and on synoptic scales. Using highly-resolved (3 km) wind fields, an extensive database is constructed from Radarsat-2 and Sentinel-1 SAR acquisitions. Spanning 161 tropical cyclones, the database covers all TC intensity categories that have occurred in five different TC basins, and include 29 cases coincident with SFMR measurements. After locating the TC center, a specific methodology is applied to filter out areas contaminated by heavy precipitations to help extract, for each acquisition, the maximum wind speed (Vmax), its associated radius (Rmax), and corresponding outer wind radii (R34/50/64-kt). These parameters are then systematically compared with Best-Track (BTK), and when available, SFMR airborne measurements. For co-located SFMR and SAR observations, comparisons yield root-mean-squares of 3.86 m s−1 and 3 km, for ocean surface wind speeds and TC Rmax, respectively. High correlations remain for category 5 cases, with Vmax exceeding 60 m s−1. The largest discrepancies are found between BTK and SAR Rmax estimates, with Rmax fluctuations poorly captured by BTK, especially for rapidly evolving category 3,4 and 5 TCs. In heavy precipitation (>35 mm h−1), the SAR C-band measurements may be impacted, with local ambiguities associated to rain features, as revealed by external rain measurements. Still, this large dataset demonstrates that SAR measurements have unique high-resolution capabilities, capturing the inner- and outer-core radial structure of the TC vortex, and provide independent and complementary measurements than those used for BTK estimates. 
PY 2020
PD NOV
SO Monthly Weather Review
SN 0027-0644
PU American Meteorological Society
VL 148
IS 11
UT 000696539600001
BP 4545
EP 4563
DI 10.1175/MWR-D-20-0005.1
ID 76589
ER

EF