Preprints
https://doi.org/10.5194/egusphere-2024-246
https://doi.org/10.5194/egusphere-2024-246
01 Feb 2024
 | 01 Feb 2024

Ice-proximal sea-ice reconstruction in Powell Basin, Antarctica since the Last Interglacial

Wee Wei Khoo, Juliane Müller, Oliver Esper, Wenshen Xiao, Christian Stepanek, Paul Gierz, Gerrit Lohmann, Walter Geibert, Jens Hefter, and Gesine Mollenhauer

Abstract. In Antarctica, the presence of sea ice in front of ice shelves promotes their stability and prevents the risk of catastrophic collapse as witnessed in recent events along the Antarctic Peninsula. Investigating past ice-proximal sea-ice conditions, especially across glacial-interglacial cycles, can provide crucial information pertaining to sea-ice variability and deepen our understanding of ocean-ice-atmosphere dynamics and feedbacks. In this study, we apply a multiproxy approach, analyzing the novel sea ice biomarker IPSO25 (a di-unsaturated highly branched isoprenoid (HBI)), open-water biomarkers (tri-unsaturated HBIs; z-/e-trienes), and the diatom assemblage and primary productivity indicators in a marine sediment core retrieved from Powell Basin, NW Weddell Sea. These biomarkers have been established as reliable proxies for reconstructing near-coastal sea ice conditions in the Southern Ocean, where the typical use of sea ice-related diatoms can be impacted by silica dissolution. Our data shed new light on the variability of sea ice since the penultimate deglaciation, ca. 145 ka before present, and reveal a highly dynamic glacial-interglacial sea-ice setting characterized by significant shifts from perennial ice cover to seasonal sea-ice cover and open marine environment.

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Journal article(s) based on this preprint

31 Jan 2025
Ice-proximal sea ice reconstruction in the Powell Basin, Antarctica, since the Last Interglacial
Wee Wei Khoo, Juliane Müller, Oliver Esper, Wenshen Xiao, Christian Stepanek, Paul Gierz, Gerrit Lohmann, Walter Geibert, Jens Hefter, and Gesine Mollenhauer
Clim. Past, 21, 299–326, https://doi.org/10.5194/cp-21-299-2025,https://doi.org/10.5194/cp-21-299-2025, 2025
Short summary
Wee Wei Khoo, Juliane Müller, Oliver Esper, Wenshen Xiao, Christian Stepanek, Paul Gierz, Gerrit Lohmann, Walter Geibert, Jens Hefter, and Gesine Mollenhauer

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-246', Xavier Crosta, 11 Mar 2024
    • AC2: 'Reply on RC1', Wee Wei Khoo, 17 May 2024
  • RC2: 'Comment on egusphere-2024-246', Anonymous Referee #2, 13 Mar 2024
    • AC1: 'Reply on RC2', Wee Wei Khoo, 17 May 2024

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-246', Xavier Crosta, 11 Mar 2024
    • AC2: 'Reply on RC1', Wee Wei Khoo, 17 May 2024
  • RC2: 'Comment on egusphere-2024-246', Anonymous Referee #2, 13 Mar 2024
    • AC1: 'Reply on RC2', Wee Wei Khoo, 17 May 2024

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
ED: Reconsider after major revisions (03 Jun 2024) by Alberto Reyes
AR by Wee Wei Khoo on behalf of the Authors (01 Jul 2024)  Author's response   Author's tracked changes   Manuscript 
ED: Referee Nomination & Report Request started (22 Jul 2024) by Alberto Reyes
RR by Xavier Crosta (26 Jul 2024)
ED: Publish subject to minor revisions (review by editor) (11 Sep 2024) by Alberto Reyes
AR by Wee Wei Khoo on behalf of the Authors (18 Oct 2024)  Author's response   Author's tracked changes   Manuscript 
ED: Publish as is (07 Nov 2024) by Alberto Reyes
AR by Wee Wei Khoo on behalf of the Authors (11 Nov 2024)  Manuscript 

Journal article(s) based on this preprint

31 Jan 2025
Ice-proximal sea ice reconstruction in the Powell Basin, Antarctica, since the Last Interglacial
Wee Wei Khoo, Juliane Müller, Oliver Esper, Wenshen Xiao, Christian Stepanek, Paul Gierz, Gerrit Lohmann, Walter Geibert, Jens Hefter, and Gesine Mollenhauer
Clim. Past, 21, 299–326, https://doi.org/10.5194/cp-21-299-2025,https://doi.org/10.5194/cp-21-299-2025, 2025
Short summary
Wee Wei Khoo, Juliane Müller, Oliver Esper, Wenshen Xiao, Christian Stepanek, Paul Gierz, Gerrit Lohmann, Walter Geibert, Jens Hefter, and Gesine Mollenhauer
Wee Wei Khoo, Juliane Müller, Oliver Esper, Wenshen Xiao, Christian Stepanek, Paul Gierz, Gerrit Lohmann, Walter Geibert, Jens Hefter, and Gesine Mollenhauer

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Short summary
Using a multiproxy approach, we analyzed biomarkers and diatom assemblages from a marine sediment core from the Powell Basin, Weddell Sea. The results reveal the first continuous coastal Antarctic sea ice record since the Last Penultimate Glacial. Our findings contribute valuable insights into past glacial-interglacial sea ice response to a changing climate and enhance our understanding of the ocean-sea ice-ice shelf interactions and dynamics.