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On the Divergence and Vorticity of SAR Derived Wind Fields

Schulz-Stellenfleth, Johannes and Lehner, Susanne and Reppucci, Antonio and Brusch, Stephan and König, Thomas (2007) On the Divergence and Vorticity of SAR Derived Wind Fields. In: ENVISAT SYMPOSIUM 2007, SP-636 on CD-ROM (2F2), pp. 1-6. ENVISAT SYMPOSIUM 2007, 2007-04-23 - 2007-04-27, Montreux, Switzerland. ISBN 92-9291-200-1. ISSN 1609-042X

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Abstract

The presented study was carried out in the framework of the AO project COTAR (ID 3183). A new approach is described to extend the point by point approach taken in most previous studies about SAR wind retrieval. The idea is to analyse the spatial dynamics of the SAR derived two dimensional (2-D) wind fields by estimating quantities like the 2-D divergence or vorticity, which are well known key parameters in the description of atmosphere dynamics. These quantities have a clear physical interpretation as they are key elements in the numerical modeling of the atmosphere. The presented analysis tool is based on a new SAR wind retrieval technique, which ensures a certain smoothness of the resulting 2-D wind field. Different examples of atmospheric features imaged by the ENVISAT ASAR and ERS-2 SAR are discussed including stable conditions, atmospheric fronts and hurricanes. For some of the case studies a combination of ERS-2 and ENVISAT scenes taken with 30 minutes time gap are used. These pairs allow a better separation of atmospheric and oceanic features and also provide some additional information of the wind field evolution in time. They can e.g. be used to test the Taylor hypothesis, which is often used in studies onmesoscale atmospheric dynamics. The presentation summarizes the consequences of the investigation for SAR wind field retrieval approaches. In particular a proposal is made to use a priori knowledge on parameters like convergence as a regularisation condition in SAR wind measurement schemes.

Document Type:Conference or Workshop Item (Speech)
Title:On the Divergence and Vorticity of SAR Derived Wind Fields
Authors:
AuthorsInstitution or Email of Authors
Schulz-Stellenfleth, JohannesUNSPECIFIED
Lehner, SusanneUNSPECIFIED
Reppucci, AntonioUNSPECIFIED
Brusch, StephanUNSPECIFIED
König, ThomasUNSPECIFIED
Date:27 April 2007
Journal or Publication Title:ENVISAT SYMPOSIUM 2007
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Volume:SP-636 on CD-ROM
Page Range:pp. 1-6
Editors:
EditorsEmail
ESA, UNSPECIFIED
ISSN:1609-042X
ISBN:92-9291-200-1
Status:Published
Keywords:SAR; wind; divergence; convergence
Event Title:ENVISAT SYMPOSIUM 2007
Event Location:Montreux, Switzerland
Event Type:international Conference
Event Dates:2007-04-23 - 2007-04-27
Organizer:ESA
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):W - Vorhaben Entwicklung und Erprobung von Verfahren zur Gewässerfernerkundung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Marine Remote Sensing
Deposited By: Bärbel Bolowski
Deposited On:22 Aug 2007
Last Modified:15 Jan 2010 00:38

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