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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
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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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 http://www.ebooklibrary.org/


Description
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.

Summary
On the characteristics of ASCAT wind direction ambiguities

Excerpt
Cornford, D., Csató, L., Evans, D. J., and Opper, M.: Baysian analysis of the scatterometer wind retrieval inverse problems: some new approaches, J. Roy. Stat. Soc. B, 66, 609–626, 2004.; Figa-Saldana, J., Wilson, J. J. W., Attema, E., Gelsthorpe, R., Drinkwater, M. R., and Stoffelen, A.: The advanced scatterometer (ASCAT) on Metop: A follow-on for European scatterometers, Can. J. Remote Sens., 28, 404–412, 2002.; Hersbach, H., Stoffelen, A., and De Haan, S.: The improved C-band ocean geophysical model function: CMOD-5, J. Geophys. Res., 112, C03006, doi:10.1029/2006JC003743, 2007.; Pierson, W. J.: Probabilities and statistics for backscatter estimates obtained by a scatterometer, J. Geophys. Res., 94, 9743–9759, 1989.; Portabella, M. and Stoffelen, A.: Rain detection and quality control of SeaWinds, J. Atmos. Ocean Tech., 18, 1171–1183, 2001.; Portabella, M., Stoffelen, Verhoef, A., and Verspeek, J.: A new method for improving scatterometer wind quality control, IEEE T. Geosci. Remote Sens., 9, 579–583, 2012a.; Portabella, M., Stoffelen, A., Lin, W., Turiel, A., Verhoef, A., Verspeek, J., and Ballabrera, J.: Rain effects on ASCAT wind retrieval: Towards an improved quality control, IEEE T. Geosci. Remote Sens., 50, 2495–2506, 2012b.; Stiles, B. W., Pollard, B. D., and Dunbar, R. S.: Direction interval retrieval with thresholded nudging: A method for improving the accuracy of QuikSCAT winds, IEEE T. Geosci. Remote Sens., 40, 79–89, 2002.; Stoffelen, A. and Anderson, D.: Scatterometer data interpretation: measurement space and inversion, J. Atmos. Ocean. Tech., 14, 1298–1313, 1997.; Stoffelen, A. and Portabella, M.: On Bayesian scatterometer wind inversion, IEEE T. Geosci. Remote Sens., 44, 1523–1533, 2006.; Verhoef, A., Portabella, M., Stoffelen, A., and Hersbach, H.: CMOD5.n- the CMOD5 GMF for neutral winds, Ocean and Sea Ice SAF Technical Note, SAF/OSI/CDOP/KNMI/TEC/TN/ 165 v.1, May 2008.; Vogelzang, J., Stoffelen, A., Verhoef, A., De Vries, J., and Bonekamp, H.: Validation of two-dimensional variational ambiguity removal on SeaWinds scatterometer data, J. Atmos. Ocean. Tech., 26, 1229–1245, 2009.

 

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