Preprints
https://doi.org/10.5194/essd-2021-444
https://doi.org/10.5194/essd-2021-444
 
28 Feb 2022
28 Feb 2022
Status: this preprint is currently under review for the journal ESSD.

The COSMUS Expedition: Seafloor Images and acoustic bathymetric data from the PS124 expedition to the southern Weddell Sea, Antarctica

Autun Purser1, Laura Hehemann1, Lilian Boehringer1, Ellen Werner2, Santiago E. A. Pineda-Metz1, Lucie Vignes3, Axel Nordhausen4, Moritz Holtappels1, and Frank Wenzhoefer1,4 Autun Purser et al.
  • 1Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, 27570 Bremerhaven, Germany
  • 2HafenCity University Hamburg, Henning-Voscherau-Platz 1, 20457 Hamburg, Germany
  • 3Sorbonne Université, CNRS/IRD/MNHN, LOCEAN, IPSL, France, Paris, France
  • 4Max Planck Institute of Marine Microbiology, Celsiusstraße 1, 28359 Bremen, Germany

Abstract. Between 3rd February and 30th March 2021 the research icebreaker RV Polarstern conducted an extensive multidisciplinary research expedition across the southern Weddell Sea, Antarctica. During the Continental Shelf Multidisciplinary Flux Study (COSMUS) expedition (designated research expedition PS124) the Ocean Floor Observation and Bathymetry System (OFOBS) was deployed 20 times to collect high resolution seafloor image and acoustic data with a 26-megapixel resolution camera, HD (high definition) video camera, forward facing acoustic camera and multibeam side-scan system from heights of between 1.5 and 4.5 m above seafloor. To localise the collected data the OFOBS was equipped with a Posidonia transponder for ultra- short baseline position triangulation, an Inertial Navigation System (INS) and a seafloor tracking Dynamic Velocity Logger (DVL). The 20 deployments were made across contrasting areas of the Weddell Sea, Filchner Trough, Filchner Sill and Filchner Shelf. Here, we present the full image data set collected from across the various deployments, as well as raw side-scan data, and derived high resolution bathymetric maps produced from this acoustic data after the cruise.

All images are available from: https://doi.pangaea.de/10.1594/PANGAEA.936205 (Purser et al., 2021b) and https://doi.pangaea.de/10.1594/PANGAEA.932827 (Purser et al., 2021c). Acoustic data for all deployments is also available from PANGAEA, with the raw side scan data available at: https://doi.pangaea.de/10.1594/PANGAEA.939322 (Hehemann et al., 2021b), forward facing acoustic camera data at: https://doi.pangaea.de/10.1594/PANGAEA.939341 (Purser et al., 2021a). Seafloor topographic maps derived from the side scan data are available at: https://doi.pangaea.de/10.1594/PANGAEA.939087 (Hehemann et al., 2021a).

Autun Purser et al.

Status: open (extended)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on essd-2021-444', Robert Larter, 09 May 2022 reply
    • AC1: 'Reply on RC1', Autun Purser, 09 May 2022 reply

Autun Purser et al.

Data sets

Forward facing acoustic camera seafloor sonar data from the southern Weddell Sea, collected during POLARSTERN expedition PS124 Laura Hehemann, Autun Purser, Lilian Boehringer, Ellen Werner, Frank Wenzhoefer https://www.pangaea.de/tok/39a664137ce46ba21251c62544da71a9ec292c91

Seafloor bathymetric maps derived from side scan data collected during POLARSTERN expedition PS124 to the southern Weddell Sea Laura Hehemann, Autun Purser, Lilian Boehringer, Ellen Werner, Frank Wenzhoefer https://www.pangaea.de/tok/f99a01bd38d3b0118d24892b47f4a6bda6b52a90

Side scan sonar and swath bathymetry collected along OFOBS profiles during POLARSTERN cruise PS124 Laura Hehemann, Autun Purser, Lilian Boehringer, Ellen Werner, Frank Wenzhoefer https://www.pangaea.de/tok/b1a2cdbf21430be4ac46adb1accfdd64fec2a726

Ocean Floor Observation and Bathymetry System (OFOBS) images of Neopagetopsis ionah ice fish nest arrays in the Filchner Trough, Antarctica collected during the PS124 Polarstern Autun Purser, Lilian Boehringer, Laura Hehemann, Frank Wenzhoefer https://www.pangaea.de/tok/3513844550fc71df3716af21181f14df9b9a9224

Ocean Floor Observation and Bathymetry System (OFOBS) seafloor images of the Weddell Sea, Antarctica collected during the PS124 Polarstern expedition. Autun Purser, Lilian Boehringer, Laura Hehemann, Frank Wenzhoefer https://www.pangaea.de/tok/12346f0b84749a6b54b204b4ae02596c39d711bc

Autun Purser et al.

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Short summary
Within this paper we present the seafloor images, maps and acoustic camera data collected by a towed underwater research platform deployed in 20 locations across the eastern Weddell Sea, Antarctica during the PS124 COSMUS expedition with the research icebreaker, RV Polarstern. The 20 deployments highlight the great variability in seafloor structure and faunal communities present. Of key interest was the discovery of the largest fish nesting colony discovered globally to date.