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On the Characteristics of Ascat Wind Direction Ambiguities : Volume 5, Issue 6 (18/12/2012)

By Lin, W.

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Book Id: WPLBN0003989513
Format Type: PDF Article :
File Size: Pages 19
Reproduction Date: 2015

Title: On the Characteristics of Ascat Wind Direction Ambiguities : Volume 5, Issue 6 (18/12/2012)  
Author: Lin, W.
Volume: Vol. 5, Issue 6
Language: English
Subject: Science, Atmospheric, Measurement
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Verhoef, A., Stoffelen, A., Portabella, M., & Lin, W. (2012). On the Characteristics of Ascat Wind Direction Ambiguities : Volume 5, Issue 6 (18/12/2012). Retrieved from

Description: Institut de Ciències del Mar (ICM) – CSIC, Barcelona, Spain. The inversion of the Advanced Scatterometer (ASCAT) backscatter measurement triplets generally leads to two wind ambiguities with similar wind speed values and opposite wind directions. However, for up-, down- and cross-wind (with respect to the mid beam azimuth direction) cases, the inversion often leads to three or four wind solutions. In most of such cases, the inversion residual or maximum likelihood estimator (MLE) of the 3rd and 4th solutions (i.e. high-rank solutions) are substantially higher than those of the first two (low rank) ambiguities, indicating a low probability of the former and thus essentially dual ambiguity. This paper investigates the characteristics of ASCAT high-rank wind solutions under different conditions with the objective to develop a method for rejecting the spurious high-rank solutions. The implementation of this rejection procedure improves the effectiveness of the ASCAT wind quality control (QC) and ambiguity removal procedures.

On the characteristics of ASCAT wind direction ambiguities

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