Surface velocity measurement in the Baltic Sea with TanDEM-X: results from the HGF-EDA study
The ocean surface boundary layer constitutes the interface between the atmosphere and the deep ocean. Correct estimation of the fluxes between ocean and atmosphere is strongly influenced by surface currents and waves. It is therefore important to consider these effects in ocean circulation or couple...
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ftdlr:oai:elib.dlr.de:107008 2024-05-19T07:48:24+00:00 Surface velocity measurement in the Baltic Sea with TanDEM-X: results from the HGF-EDA study Suchandt, Steffen Lehmann, Andreas Herrford, Josefine Romeiser, Roland Pleskachevsky, Andrey Runge, Hartmut DLR, Microwaves and Radar Institute 2016 application/pdf https://elib.dlr.de/107008/ https://elib.dlr.de/107008/1/Suchandt_etal_ATI_OCEAN_Science_Meeting_2016_Abstract.pdf http://sss.terrasar-x.dlr.de/papers_sci_meet_2016/2.2_ocean-1/3_suchandt.pdf de ger https://elib.dlr.de/107008/1/Suchandt_etal_ATI_OCEAN_Science_Meeting_2016_Abstract.pdf Suchandt, Steffen und Lehmann, Andreas und Herrford, Josefine und Romeiser, Roland und Pleskachevsky, Andrey und Runge, Hartmut (2016) Surface velocity measurement in the Baltic Sea with TanDEM-X: results from the HGF-EDA study. In: TerraSAR-X / TanDEM-X Science Team Meeting 2016, TerraSAR-X Science Service (online). TerraSAR-X / TanDEM-X Science Team Meeting 2016, 2016-10-17 - 2016-10-20, Oberpfaffenhofen, Deutschland. SAR-Signalverarbeitung Konferenzbeitrag NonPeerReviewed 2016 ftdlr 2024-04-25T00:38:58Z The ocean surface boundary layer constitutes the interface between the atmosphere and the deep ocean. Correct estimation of the fluxes between ocean and atmosphere is strongly influenced by surface currents and waves. It is therefore important to consider these effects in ocean circulation or coupled atmosphere-ocean models which are also used for climate studies. It has been demonstrated that sea surface velocities can be mapped for large areas and with high sensitivity by space borne SAR Along-track interferometry (ATI), e.g. in [Romeiser et al. 2014, Suchandt et al. 2015]. In this study, we utilize TanDEM-X to extract information on ocean surface processes. The satellite formation provides a unique testbed for oceanography with SAR-ATI. Within several campaigns, we have acquired bi-static interferometric data in the Baltic Sea. It serves as a pilot study area, where different kinds of reference data are available. A surface current extraction processor has been developed that derives surface velocity maps from TanDEM-X CoSSC datasets. We cross-compare these velocities to data from a numerical circulation model of the Baltic Sea as well as to in-situ measurements with the aim of geophysical interpretation. Comparison of the TanDEM-X derived velocity maps to surface currents from the Baltic Sea Ice Ocean Model (BSIOM) shows good qualitative agreement. Remaining differences are due to the influence of wave motion. To distinguish between different contributions to the observed Doppler velocities, this influence must be quantified and compensated through suitable wind field information. We demonstrate how high-resolution wind data can be extracted from the normalized radar cross section (NRCS) of the same TanDEM-X data that are used for surface velocity measurement [Pleskachevsky et al. 2016]. This way, the often high spatial variability of the wind/wave influence on Doppler velocities can be estimated and accounted for. By this approach, different information layers of the CoSSC data are beneficially combined. It ... Conference Object Sea ice German Aerospace Center: elib - DLR electronic library |
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Open Polar |
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German Aerospace Center: elib - DLR electronic library |
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ftdlr |
language |
German |
topic |
SAR-Signalverarbeitung |
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SAR-Signalverarbeitung Suchandt, Steffen Lehmann, Andreas Herrford, Josefine Romeiser, Roland Pleskachevsky, Andrey Runge, Hartmut Surface velocity measurement in the Baltic Sea with TanDEM-X: results from the HGF-EDA study |
topic_facet |
SAR-Signalverarbeitung |
description |
The ocean surface boundary layer constitutes the interface between the atmosphere and the deep ocean. Correct estimation of the fluxes between ocean and atmosphere is strongly influenced by surface currents and waves. It is therefore important to consider these effects in ocean circulation or coupled atmosphere-ocean models which are also used for climate studies. It has been demonstrated that sea surface velocities can be mapped for large areas and with high sensitivity by space borne SAR Along-track interferometry (ATI), e.g. in [Romeiser et al. 2014, Suchandt et al. 2015]. In this study, we utilize TanDEM-X to extract information on ocean surface processes. The satellite formation provides a unique testbed for oceanography with SAR-ATI. Within several campaigns, we have acquired bi-static interferometric data in the Baltic Sea. It serves as a pilot study area, where different kinds of reference data are available. A surface current extraction processor has been developed that derives surface velocity maps from TanDEM-X CoSSC datasets. We cross-compare these velocities to data from a numerical circulation model of the Baltic Sea as well as to in-situ measurements with the aim of geophysical interpretation. Comparison of the TanDEM-X derived velocity maps to surface currents from the Baltic Sea Ice Ocean Model (BSIOM) shows good qualitative agreement. Remaining differences are due to the influence of wave motion. To distinguish between different contributions to the observed Doppler velocities, this influence must be quantified and compensated through suitable wind field information. We demonstrate how high-resolution wind data can be extracted from the normalized radar cross section (NRCS) of the same TanDEM-X data that are used for surface velocity measurement [Pleskachevsky et al. 2016]. This way, the often high spatial variability of the wind/wave influence on Doppler velocities can be estimated and accounted for. By this approach, different information layers of the CoSSC data are beneficially combined. It ... |
author2 |
DLR, Microwaves and Radar Institute |
format |
Conference Object |
author |
Suchandt, Steffen Lehmann, Andreas Herrford, Josefine Romeiser, Roland Pleskachevsky, Andrey Runge, Hartmut |
author_facet |
Suchandt, Steffen Lehmann, Andreas Herrford, Josefine Romeiser, Roland Pleskachevsky, Andrey Runge, Hartmut |
author_sort |
Suchandt, Steffen |
title |
Surface velocity measurement in the Baltic Sea with TanDEM-X: results from the HGF-EDA study |
title_short |
Surface velocity measurement in the Baltic Sea with TanDEM-X: results from the HGF-EDA study |
title_full |
Surface velocity measurement in the Baltic Sea with TanDEM-X: results from the HGF-EDA study |
title_fullStr |
Surface velocity measurement in the Baltic Sea with TanDEM-X: results from the HGF-EDA study |
title_full_unstemmed |
Surface velocity measurement in the Baltic Sea with TanDEM-X: results from the HGF-EDA study |
title_sort |
surface velocity measurement in the baltic sea with tandem-x: results from the hgf-eda study |
publishDate |
2016 |
url |
https://elib.dlr.de/107008/ https://elib.dlr.de/107008/1/Suchandt_etal_ATI_OCEAN_Science_Meeting_2016_Abstract.pdf http://sss.terrasar-x.dlr.de/papers_sci_meet_2016/2.2_ocean-1/3_suchandt.pdf |
genre |
Sea ice |
genre_facet |
Sea ice |
op_relation |
https://elib.dlr.de/107008/1/Suchandt_etal_ATI_OCEAN_Science_Meeting_2016_Abstract.pdf Suchandt, Steffen und Lehmann, Andreas und Herrford, Josefine und Romeiser, Roland und Pleskachevsky, Andrey und Runge, Hartmut (2016) Surface velocity measurement in the Baltic Sea with TanDEM-X: results from the HGF-EDA study. In: TerraSAR-X / TanDEM-X Science Team Meeting 2016, TerraSAR-X Science Service (online). TerraSAR-X / TanDEM-X Science Team Meeting 2016, 2016-10-17 - 2016-10-20, Oberpfaffenhofen, Deutschland. |
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1799466637401784320 |