Bergen Open Research Archive

Toward an optimal inversion method for synthetic aperture radar wind retrieval

Bergen Open Research Archive

Show simple item record Portabella, M. Stoffelen, A. Johannessen, Johnny A. 2005-10-04T07:43:48Z 2005-10-04T07:43:48Z 2002-08-01
dc.identifier.citation Journal of Geophysical Research: Oceans 107(C8): 3086 en
dc.identifier.issn 0148-0227
dc.description.abstract In recent years, particular efforts have been made to derive wind fields over the oceans from synthetic aperture radar (SAR) images. In contrast with the scatterometer, the SAR has a higher spatial resolution and therefore has the potential to provide higher resolution wind information. Since there are at least two geophysical parameters (wind speed and wind direction) modulating the single SAR backscatter measurements, the inversion of wind fields from SAR observations has an inherent problem of underdetermination. Moreover, this modulation is highly nonlinear, further complicating the inversion. Lorenc [1986] presented a general statistical approach to solve inversion problems (including underdetermined problems) in meteorological analysis. We propose a SAR wind retrieval method based on this general approach. This simplified method combines the SAR information with some background information coming from high-resolution limited area model to retrieve the most probable wind vector, assuming that all sources of information contain errors and that these are well characterized. We then evaluate two different SAR wind retrieval methods. The first one is commonly used by the SAR community and is based on a combination of a wind streak detection algorithm (wind direction retrieval) and a C band model inversion (wind speed retrieval). The second one is the new method we propose, based on the general statistical approach. We show the potential problems and limitations of using any of these methods and show how the second method can potentially contribute to a significant improvement in SAR wind retrieval. The new method prepares the ground for the assimilation of SAR data in high-resolution numerical weather prediction models. en
dc.format.extent 564022 bytes
dc.format.mimetype application/pdf
dc.language.iso eng
dc.publisher American Geophysical Union en
dc.rights Copyright 2002 by the American Geophysical Union.
dc.subject Mathematical Geophysics en
dc.subject Meteorology en
dc.subject Remote sensing en
dc.title Toward an optimal inversion method for synthetic aperture radar wind retrieval en
dc.type Journal article eng
dc.type.version publishedVersion eng
bora.peerreviewed Peer reviewed eng
bora.journalTitle Journal of Geophysical Research: Oceans
bibo.volume 107
bibo.issue C8

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