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Surface velocity measurement in the Baltic Sea with TanDEM-X: results from the HGF-EDA study

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, 17.-20. Okt. 2016, Oberpfaffenhofen, Deutschland.

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Offizielle URL: http://sss.terrasar-x.dlr.de/papers_sci_meet_2016/2.2_ocean-1/3_suchandt.pdf

Kurzfassung

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 shows how new SAR oceanographic data products can evolve from TanDEM-X and also from follow-on missions like TanDEM-L. References: R. Romeiser, H. Runge, S. Suchandt, R. Kahle, C. Rossi and C.S. Bell, “Quality Assessment of Surface Current Fields From TerraSAR-X and TanDEM-X Along-Track Interferometry and Doppler Centroid Analysis”, IEEE Trans. Geosci. Remote Sens., vol. 52, no. 5, pp. 2759-2772, 2014. S. Suchandt and H. Runge: „Ocean Surface Observations Using the TanDEM-X Satellite Formation”, IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, vol. 8, issue 11, pp. 5096-5105, 2015. A.L. Pleskachevsky, W. Rosenthal and S. Lehner, “Meteo-marine parameters for highly variable environment in coastal regions from satellite radar images”, ISPRS Journal of Photogrammetry and Remote Sensing, in press, March 2016.

elib-URL des Eintrags:https://elib.dlr.de/107008/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Surface velocity measurement in the Baltic Sea with TanDEM-X: results from the HGF-EDA study
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Suchandt, SteffenDLRNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Lehmann, AndreasGEOMAR Helmholtz Centre for Ocean ResearchNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Herrford, JosefineGEOMAR Helmholtz Centre for Ocean ResearchNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Romeiser, RolandUniversity of MiamiNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Pleskachevsky, AndreyAndrey.Pleskachevsky (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Runge, HartmutDLR IMFNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:2016
Erschienen in:TerraSAR-X / TanDEM-X Science Team Meeting 2016, TerraSAR-X Science Service (online)
Referierte Publikation:Nein
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Herausgeber:
HerausgeberInstitution und/oder E-Mail-Adresse der HerausgeberHerausgeber-ORCID-iDORCID Put Code
DLR, Microwaves and Radar InstituteNICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Status:veröffentlicht
Stichwörter:Surface velocity, Baltic Sea, TanDEM-X, HGF-EDA
Veranstaltungstitel:TerraSAR-X / TanDEM-X Science Team Meeting 2016
Veranstaltungsort:Oberpfaffenhofen, Deutschland
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:17.-20. Okt. 2016
Veranstalter :DLR
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erdbeobachtung
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):R - Vorhaben Tandem-L Vorstudien (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Methodik der Fernerkundung > SAR-Signalverarbeitung
Hinterlegt von: Suchandt, Steffen
Hinterlegt am:28 Okt 2016 10:12
Letzte Änderung:31 Jul 2019 20:04

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