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Remote Sens. 2016, 8(9), 721; doi:10.3390/rs8090721

Hurricane Wind Speed Estimation Using WindSat 6 and 10 GHz Brightness Temperatures

1
Institute of Meteorology and Oceanography, PLA University of Science and Technology, Nanjing 211101, China
2
Key Laboratory of Microwave Remote Sensing, Chinese Academy of Sciences, Beijing 100190, China
3
National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China
4
Beijing Piesat Information Technology Co., Ltd., Beijing 100190, China
*
Author to whom correspondence should be addressed.
Academic Editors: Xiaofeng Li and Prasad S. Thenkabail
Received: 4 August 2016 / Revised: 4 August 2016 / Accepted: 23 August 2016 / Published: 31 August 2016
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Abstract

The realistic and accurate estimation of hurricane intensity is highly desired in many scientific and operational applications. With the advance of passive microwave polarimetry, an alternative opportunity for retrieving wind speed in hurricanes has become available. A wind speed retrieval algorithm for wind speeds above 20 m/s in hurricanes has been developed by using the 6.8 and 10.7 GHz vertically and horizontally polarized brightness temperatures of WindSat. The WindSat measurements for 15 category 4 and category 5 hurricanes from 2003 to 2010 and the corresponding H*wind analysis data are used to develop and validate the retrieval model. In addition, the retrieved wind speeds are also compared to the Remote Sensing Systems (RSS) global all-weather product and stepped-frequency microwave radiometer (SFMR) measurements. The statistical results show that the mean bias and the overall root-mean-square (RMS) difference of the retrieved wind speeds with respect to the H*wind analysis data are 0.04 and 2.75 m/s, respectively, which provides an encouraging result for retrieving hurricane wind speeds over the ocean surface. The retrieved wind speeds show good agreement with the SFMR measurements. Two case studies demonstrate that the mean bias and RMS difference are 0.79 m/s and 1.79 m/s for hurricane Rita-1 and 0.63 m/s and 2.38 m/s for hurricane Rita-2, respectively. In general, the wind speed retrieval accuracy of the new model in hurricanes ranges from 2.0 m/s in light rain to 3.9 m/s in heavy rain. View Full-Text
Keywords: polarimetric microwave radiometer; sea surface wind retrieval; WindSat; H*wind analysis data polarimetric microwave radiometer; sea surface wind retrieval; WindSat; H*wind analysis data
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Zhang, L.; Yin, X.-B.; Shi, H.-Q.; Wang, Z.-Z. Hurricane Wind Speed Estimation Using WindSat 6 and 10 GHz Brightness Temperatures. Remote Sens. 2016, 8, 721.

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