Sea-ice distribution and ocean temperature variation in the Powell Basin and Scotia Sea, inferred from marine sediment cores PS118_63-1 and PS67/219-1


Presently, there is a scarcity of coastal (paleo) sea-ice reconstructions for periods prior to the Last Glacial Maximum. In this study, we investigated sea ice and ocean temperature proxies from marine sediment core PS118_63-1 from the Powell Basin, NW Weddell Sea. Past sea-ice characteristics inferred from the sea-ice biomarker IPSO25, alongside phytoplankton biomarkers, TOC, biogenic opal estimates and diatom assemblages provide a continuous record of past sea-ice conditions and ocean temperature variability, back to the Penultimate Glacial (ca. 145 ka BP). Our results reveal a highly dynamic sea-ice environment, characterized by significant shifts from perennial (sea) ice cover to more seasonal sea-ice cover to open ocean conditions, with no significant glacial-interglacial ocean temperature variability in the Powell Basin. Furthermore, latitudinal tracking of sea-ice distribution and sea surface temperature differences is enabled when comparing diatom-inferred data from the marine sediment core PS67/219-1.

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Metadata Access
Creator Khoo, Wee Wei ORCID logo; Esper, Oliver ORCID logo; Xiao, Wenshen; Hefter, Jens ORCID logo; Müller, Juliane ORCID logo
Publisher PANGAEA
Publication Year 2024
Rights Creative Commons Attribution 4.0 International; Data access is restricted (moratorium, sensitive data, license constraints);
OpenAccess false
Resource Type Bundled Publication of Datasets; Collection
Format application/zip
Size 3 datasets
Discipline Earth System Research
Spatial Coverage (-47.734W, -61.124S, -42.467E, -57.220N)
Temporal Coverage Begin 2005-05-10T12:28:00Z
Temporal Coverage End 2019-03-28T21:11:00Z