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Retrieval of Wind and Total Surface Current Vectors Using Experimental Bidirectional Along-Track Interferometric TanDEM-X Data

Caldarella, Nina and Lopez-Dekker, Paco and Prats-Iraola, Pau and Nouguier, Frédéric and Chapron, Betrand and Zonno, Mariantonietta and Rodriguez-Cassola, Marc (2022) Retrieval of Wind and Total Surface Current Vectors Using Experimental Bidirectional Along-Track Interferometric TanDEM-X Data. IEEE Transactions on Geoscience and Remote Sensing, 60, pp. 1-12. IEEE - Institute of Electrical and Electronics Engineers. doi: 10.1109/TGRS.2022.3147490. ISSN 0196-2892.

[img] PDF - Postprint version (accepted manuscript)

Official URL: https://ieeexplore.ieee.org/document/9696336


Observations of wind and ocean surface velocity vectors by along-track interferometry (ATI) with the synthetic aperture radar (SAR) are not only important for direct applications but also to increase understandings of ocean upper layer mixing, air–ocean interactions, and mapping submesoscale (1–10 km) structures. An experimental bidirectional (BiDi) ATI acquisition mode of TanDEM-X observes with two squinted beams separated by an angle of approximately 13.2º in azimuth on the ground. The baseline is very short, and the along-track interferometric phase (ATI phase) of the ocean surface in the line-of-sight direction of the beams can be interpreted as a total Doppler velocity. The 2-D Doppler velocity field will thus include wind-wave detected motions. In this article, Doppler velocity fields acquired from this experimental acquisition mode are presented. The sequential retrieval of wind vector and total surface current vectors (TSCV) is demonstrated on the BiDi TanDEM-X data. The retrieval algorithm builds on existing geophysical model functions (GMFs) of normalized radar cross section (NRCS) and Doppler velocity. XMOD2 and a GMF based on the Elfouhaily ocean wave spectrum coupled with a Kirchhoff approximation (EOWS&KA) are used. The retrieved wind fields are generally consistent with the European Centre for Medium-Range Weather Forecasts (ECMWF) ERA-5. While the ATI phase errors are small, the retrieved TSCV field looks promising. Acquisitions were located at sea over the tip of the Novaya Zemlya in Russia and over an area near Tromsø, Norway.

Item URL in elib:https://elib.dlr.de/190514/
Document Type:Article
Additional Information:©2022 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE
Title:Retrieval of Wind and Total Surface Current Vectors Using Experimental Bidirectional Along-Track Interferometric TanDEM-X Data
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Caldarella, NinaUNSPECIFIEDhttps://orcid.org/0000-0002-8202-1088UNSPECIFIED
Lopez-Dekker, PacoUNSPECIFIEDhttps://orcid.org/0000-0002-0221-4403UNSPECIFIED
Prats-Iraola, PauUNSPECIFIEDhttps://orcid.org/0000-0002-7583-2309UNSPECIFIED
Nouguier, FrédéricUNSPECIFIEDhttps://orcid.org/0000-0002-7551-0158UNSPECIFIED
Zonno, MariantoniettaUNSPECIFIEDhttps://orcid.org/0000-0001-9537-1899UNSPECIFIED
Date:28 January 2022
Journal or Publication Title:IEEE Transactions on Geoscience and Remote Sensing
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 1-12
Publisher:IEEE - Institute of Electrical and Electronics Engineers
Keywords:Along-track interferometry (ATI), bidirectional (BiDi) synthetic aperture radar (SAR), ocean surface current vectors, TanDEM-X, wind vectors
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:other
DLR - Research area:Raumfahrt
DLR - Program:R - no assignment
DLR - Research theme (Project):R - no assignment
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute
Microwaves and Radar Institute > SAR Technology
Microwaves and Radar Institute > Radar Concepts
Deposited By: Prats, Dr. Pau
Deposited On:23 Nov 2022 06:10
Last Modified:19 Sep 2023 13:19

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