1. Extreme Winds from Ku-Band and C-Band Wind Scatterometers
- Author
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China Meteorological Administration, Agencia Estatal de Investigación (España), Xu, Xueqing, Stoffelen, Ad, Ni, Weicheng, Portabella, Marcos, Rabaneda, Albert S., China Meteorological Administration, Agencia Estatal de Investigación (España), Xu, Xueqing, Stoffelen, Ad, Ni, Weicheng, Portabella, Marcos, and Rabaneda, Albert S.
- Abstract
C-band scatterometer winds have been adjusted for extreme conditions and in this research extension to Ku-band scatterometers is investigated. With rain rates from the Global Precipitation Measurement mission collocated to the Ku-band scatterometer observations to identify and exclude rain contamination of winds, calibration of the Ku-band observations can be done. Using high-wind cases extracted from collocated C- and Ku-band observations, we develop a calibration model and extend the Ku-band winds to 35 m/s. Validation is obtained from the set not included in the model derivation, indicating a speed error less than 10% for wind speed larger than 30m/s. The modified speed is consistent with the Step Frequency Microwave Radiometer measurements, when collocated with another Ku-band scatterometer. A comparison for the Tropical Cyclone Manyi in 2018 shows the adjustedd wind fits better with the best-track information provided by the Chinese Meteorological Administration, while more details are revealed. Results can be improved after obtaining more collocations with the dual-frequency scatterometer "WindRad" onboard the FY-3E satellite. A method for wind direction enhancement in extreme conditions is also discussed
- Published
- 2023