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.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
Wee Wei Khoo, Juliane Müller, Oliver Esper, Wenshen Xiao, Christian Stepanek, Paul Gierz, Gerrit Lohmann, Walter Geibert, Jens Hefter, and Gesine Mollenhauer

Status: final response (author comments only)

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
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

Viewed

Total article views: 445 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
314 102 29 445 48 18 19
  • HTML: 314
  • PDF: 102
  • XML: 29
  • Total: 445
  • Supplement: 48
  • BibTeX: 18
  • EndNote: 19
Views and downloads (calculated since 01 Feb 2024)
Cumulative views and downloads (calculated since 01 Feb 2024)

Viewed (geographical distribution)

Total article views: 448 (including HTML, PDF, and XML) Thereof 448 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 24 Jul 2024
Download
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.