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| Titel |
On the characteristics of ASCAT wind direction ambiguities |
| VerfasserIn |
W. Lin, M. Portabella, A. Stoffelen, A. Verhoef |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 6, no. 4 ; Nr. 6, no. 4 (2013-04-22), S.1053-1060 |
| Datensatznummer |
250017878
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| Publikation (Nr.) |
 copernicus.org/amt-6-1053-2013.pdf |
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| Zusammenfassung |
| 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 crosswind
(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
residuals or maximum likelihood estimators (MLEs) of the third and
fourth solutions (i.e. high-rank solutions) are substantially higher than
those of the first two (low-rank) ambiguities. This indicates a low
probability for the high-rank solutions and thus essentially dual ambiguity.
This paper investigates the characteristics of ASCAT high-rank wind
solutions under different conditions with the objective of developing 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. |
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