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SAR wave mode data - A new source for Ocean and Sea Ice Related Climate Research

Lehner, Susanne and König, Thomas and Schulz-Stellenfleth, Johannes and Niedermeier, Andreas (2004) SAR wave mode data - A new source for Ocean and Sea Ice Related Climate Research. In: Remote Sensing of the Ocean and Sea Ice 2003, 5233, pp. 126-133. SPIE Remote Sensing Symposium, Barcelona, Spain, 8-12 September, 2003. ISBN 0-8194-5116-9.

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From raw ERS wavemode data, complex SAR images of size 5 km x 10 km - so called imagettes - are computed using DLR's BSAR processor. Being collected over oceans every 200 km along the orbit, imagettes provide a patchy daily global coverage of the world's oceans. This paper presents DLR's processing chain and results for a three week testing period covering the detection of ocean slicks and sea ice, the use of cross spectra to derive wave spectra over open ocean, the detection of one or several ocean wave systems together with its wave length and its propagation direction, and the estimation of single wave heights. In sea ice covered areas, statistical parameters derived from the SAR are well correlated to physical measures such as the ice deformation energy and ridge frequency. Over ice free areas, comparisons between the SAR results and the ECMWF analysis as well as model results show good agreement in most cases. Observed deviations between SAR measurements and model results are discussed. As a new application of wave mode data statistics are presented on the occurence of extreme waves. As soon as ESA will make available the daily global raw wavemode data for the whole lifetime of ERS-1 and ERS-2, it will be possible to DLR to derive unique statistics on sea ice and wave parameters for a period of at least 10 years, which may be even extended by the use of ENVISAT data in future. Together with near surface wind fields which are also derivable from the imagettes, this work will be of extreme use for climate research applications.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=2004,
Title:SAR wave mode data - A new source for Ocean and Sea Ice Related Climate Research
AuthorsInstitution or Email of Authors
Lehner, SusanneUNSPECIFIED
Schulz-Stellenfleth, JohannesUNSPECIFIED
Niedermeier, AndreasUNSPECIFIED
Journal or Publication Title:Remote Sensing of the Ocean and Sea Ice 2003
Page Range:pp. 126-133
Series Name:Proceedings of the SPIE
Event Title:SPIE Remote Sensing Symposium, Barcelona, Spain, 8-12 September, 2003
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):UNSPECIFIED
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute
Deposited By: Bärbel Bolowski
Deposited On:07 Feb 2006
Last Modified:06 Jan 2010 22:24

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