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Remote Sensing Of North Atlantic Storms: Synergetic Use Of Active Microwave And Optical Data

Brusch, Stephan and Lehner, Susanne and Schulz-Stellenfleth, Johannes (2007) Remote Sensing Of North Atlantic Storms: Synergetic Use Of Active Microwave And Optical Data. In: ENVISAT Symposium 2007, SP-636 on CD-ROM (2P1), pp. 1-5. ENVISAT SYMPOSIUM 2007, 2007-04-23 - 2007-04-27, Montreux, Switzerland. ISBN 92-9291-200-1. ISSN 1609-042X

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The aim is to use Synthetic Aperture Radar (SAR) in synergy with optical data to analyse severe weather systems, e.g., Tropical Cyclones, North Atlantic Storms and Polar Lows. Radar reflectivity over the ocean depends on the roughness of the sea surface and thus mainly on the wind field. Additionally the backscatter of the radar signal is influenced by the size of hydrometeors, e.g. rain drops or snow in the atmosphere and their precipitation rate. The Medium Resolution Imaging Spectrometer (MERIS) instrument that is flying on board the ENVISAT satellite or the Moderate Resolution Imaging Spectroradiometer (MODIS) that is flying on the AUQA/TERRA satellites provide an image over a specific region every three respectively every two days. These measurements are useful to estimate cloud parameters. Synthetic Aperture Radars (SARs) are capable of imaging synoptic wind fields near the sea surface with a coverage of up to 500 km x 500 km and a resolution on a subkilometer scale. For retrieving wind speeds from SAR data a model function (CMOD 4 and 5) [1] relating the Normalized Radar Cross Section (NRCS) of the ocean surface to the local nearsurface wind speed, wind direction versus antenna look direction and incidence angle is used. As examples severe storm system are investigated. By synergetic use of ENVISAT ASAR, MERIS and MODIS data the relationship between cloud patterns with different cloud parameters, e.g. cloud top pressure, cloud optical thickness and NRCS is investigated. A high correlation between convective clouds and NRCS was detected. Downburst produced by a convective downdraft over a region of less than 1 to 10 km horizontal extension and their interactions with the sea surface are observed in SAR images. The variation of the backscattering coefficient due to rain is considered, too.

Document Type:Conference or Workshop Item (Speech)
Title:Remote Sensing Of North Atlantic Storms: Synergetic Use Of Active Microwave And Optical Data
AuthorsInstitution or Email of Authors
Brusch, StephanUNSPECIFIED
Lehner, SusanneUNSPECIFIED
Schulz-Stellenfleth, JohannesUNSPECIFIED
Date:27 April 2007
Journal or Publication Title:ENVISAT Symposium 2007
Refereed publication:No
In ISI Web of Science:No
Volume:SP-636 on CD-ROM
Page Range:pp. 1-5
Keywords:SAR, RS
Event Location:Montreux, Switzerland
Event Type:international Conference
Event Dates:2007-04-23 - 2007-04-27
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: Berlin-Adlershof , Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Marine Remote Sensing
Deposited By: Bärbel Bolowski
Deposited On:20 Aug 2007
Last Modified:14 Jan 2010 23:22

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