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

Purser, Autun; Hehemann, Laura; Boehringer, Lilian; Werner, Ellen; Pineda-Metz, Santiago E. A.; Vignes, Lucie; Nordhausen, Axel; Holtappels, Moritz; Wenzhoefer, Frank

doi:https://doi.org/10.5194/essd-2021-444

Preprints

https://doi.org/10.5194/essd-2021-444

Preprints

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 Wenzhoefer^1,4 Autun Purser et al.

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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

Received: 12 Dec 2021 – Discussion started: 28 Feb 2022

Abstract. Between 3^rd February and 30^th 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 (until 29 May 2022)

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RC1:
'Comment on essd-2021-444', Robert Larter, 09 May 2022 reply

I commend the authors for making these large and valuable datasets available through PANGAEA. However, when checking some of the links I found that I was not able to access some of the datasets due to a moratorium being in place until 26th March next year. This is understandable, but there is no mention of the existence of the moratorium in the manuscript. I suggest adding a short sentence to the Data Availability secton to say that some of the datasets will be released for public access after 26th March 2023.

Most of the Data Availability section is duplicated in the Abstract, and I see no reason for this. The last paragraph of the Abstract could be replaced by a single short sentence stating that these datasets are available from PANGAEA and that links are included in the Data Availability section .

The example images in the figures are fascinating and useful. However, I struggled to see the red points within each image representing reflections from the sizing lasers. Perhaps one or more of the images could be annotated to make these clearer?

Aside from the above points I have indicated some minor corrections and comments on an annotated version of the manuscript, which I will upload with this review.

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Citation: https://doi.org/10.5194/essd-2021-444-RC1
- AC1: 'Reply on RC1', Autun Purser, 09 May 2022 reply
  
  Dear Robert Larter,
  Thank you for your comments on the paper!
  I would like to make a couple of quick comments on the points raised:
  1) Access to the data for reviewers. There are single use keys for data access which can be made available to the reviewers direct from the journal editorial team...or from me via an email (autun.purser@awi.de). Please let me know if you would like one of these?
  2) The repeat of the data availability info in the abstract. This is a feature of the ESSD journal submission at the moment, and was directly requested by the journal.
  3) As to the lazer points, I will add some indicative arrows to an image in the revised version of the manuscript.
  
  Thank you again for your rapid response!
  
  Autun Purser, on behalf of all authors
  
  Reply
  
  Citation: https://doi.org/10.5194/essd-2021-444-AC1

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.


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