High Quality Wind Retrievals for Hurricanes Isabel and Fabian ...
High Quality Wind Retrievals for Hurricanes Using the SeaWinds Scatterometer W. Linwood Jones and Ian Adams Central Florida Remote Sensing Lab Univ. of Central FL Presentation Outline Hurricane Wind Vector Retrieval Issues CFRSL Hurricane Retrieval Algorithm QRad Rain Rate Algorithm Isabel and Fabian Results
Conclusion Issues with L2B Wind Vector Retrieval for Extreme Wind Events Wind retrievals not tuned for high wind speeds Geophysical Model Function developed for wind speeds < 20 m/s
CFRSL Approach Tropical Cyclone GMF tuned for retrieving high wind speeds Blended UMASS aircraft scat measurements and NSCAT GMF
Issues with L2B Wind Vector Retrieval for Extreme Wind Events Egg spatial resolution @ 25 km sampling is too coarse CFRSL Approach Uses
gridded slice sigma-o @ 12.5 Km sampling Latitude 25 km 50 km
25 km resolution using eggs Longitude Range gated slices from egg 30 km 25 km 6 km
12.5 km Issues with L2B Wind Vector Retrieval for Extreme Wind Events Rain has negative effects on wind measurements Rain attenuation lowers retrieved wind speeds Volume scattering increases retrieved wind
speeds and alters directional signatures Rain splash increases retrieved wind speeds and changes anisotropic ocean surface features MUDDH performance in hurricanes is poor Issues with L2B Wind Vector Retrieval for Extreme Wind Events Rain has negative effects on wind measurements
CFRSL Approach Simultaneous rain measurement using QRad Rain attenuation and volume backscatter correction provided Rain splash effect included in GMF Rain Quality Flags Provided
CFRSL Hurricane Retrieval Algorithm Slice sigma-0s for improved spatial resolution - 12.5 km Sigma-0 minimum eye location Wind speed retrieved from individual sigma-0 (assumed spiral wind directions) Rain inferred using QRad rain rate algorithm Sigma-0 corrections from atmospheric transmissivity and rain volume backscatter Flag pixels that correspond to high rain attenuation
QRad Algorithm Block Diagram QScat L1B sig-0 L2A Tbs Bin Slice Sig-0 Locate Center Atmos. Atten
QuikSCAT vs. H* Wind Analysis SeaWinds vs. HRD Model CFRSL Algorithm Composite Wind Speeds Conclusion Ready to test current algorithm in operational environment
Acceptable estimates of high rain rates inside storm conditions Reasonable wind speed retrievals up to 40 - 45 m/s Work must be done to improve model function and rain backscatter and attenuation estimates Will
utilize UMass IWRAP and SFMR data set Have simultaneous AMSR and SRad for the 2003 hurricane season
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