Correction to “NSCAT high‐resolution surface wind measurements in Typhoon Violet” by W. Linwood Jones, Vincent J. Cardone, Willard J. Pierson, Josko Zec, Larry P. Rice, Andrew Cox, and Winfield B. Sylvester

Because of their high wind gradient structures, tropical cyclones (TC's) present a major challenge to space-borne scatterometer measurements of ocean surface wind vectors. Frequently spiral bands of strong rains accompany the high winds, and this precipitation attenuates the ocean backscatter due to wind. Also scattering by the rain volume increases the backscatter measured by the scatterometer. Furthermore, traditional geophysical model functions (GMF), which relate wind speed and direction with radar backscatter (sigma-0), have not been tuned for the high wind conditions of TC's. The SeaWinds scatterometer has the ability to measure simultaneously the ocean backscatter and brightness temperature.By using this combined active/passive approach, simultaneous wind and rain estimates are made in TC's. Rain rate, determined passively, is used to model both the attenuative and scattering effects of rain. These parameters are used to correct the measured ocean sigma-0 at 12.5 km resolution. Wind Speed retrievals are performed using a special TC-GMF developed using airborne scatterometer measurements in hurricanes. SeaWinds wind speed results for several hurricanes occurring between 1999 and 2002 compare well with high-resolution surface wind fields available from NOAA's Hurricane Research Division aircraft flights.

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Improved hurricane wind speed algorithm for the seawinds satellite scatterometer

Adams

Jones

Park

et al.

Oceans '02 MTS/IEEE

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Abszracl-Satellite microwave scatterometer wind retrievals, given in the standard product (e.g., QuikSCAT LZB), badly underestimate the peak wind speed in tropical cyclones. One important reason is that the effects of precipitation on the normalized radar cross section sigma-0 are neglected in the processing algorithms. This paper presents results of a first attempt to provide sigma-0 corrections, which account for the atmospheric attenuation of the rain. Atmospheric transmissivity is derived from the QuikSCAT Radiometer ( Q W ) excess brightness temperatures taken simultaneously with sigma-0 measurements. When applied, retrieved wind speeds show improved agreement with numerical hurricane models (PSUINCAR MMS) where there is moderate to high rainfall.

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Correction to “NSCAT high‐resolution surface wind measurements in Typhoon Violet” by W. Linwood Jones, Vincent J. Cardone, Willard J. Pierson, Josko Zec, Larry P. Rice, Andrew Cox, and Winfield B. Sylvester

Cited by 3 publications

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Scatterometer-retrieved hurricane wind direction ambiguity removal using spiral dealias

Scatterometer-retrieved hurricane wind direction ambiguity removal using spiral dealias

Combined active/passive hurricane wind retrieval algorithm for the Seawinds scatterometer

Improved hurricane wind speed algorithm for the seawinds satellite scatterometer

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