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

• DOI: 10.5194/egusphere-2024-246
• Publication Date: 2024-02-01T14:01:52Z
• Authors: Wee Wei Khoo; Juliane Müller; Oliver Esper; Wenshen Xiao; Christian Stepanek; Paul Gierz; Gerrit Lohmann; Walter Geibert; Jens Hefter; Gesine Mollenhauer
• Keywords: Environmental sciences; TD172-193.5; TD169-171.8; GE1-350; Environmental protection; Environmental pollution

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