Variety and Distribution of Diatom-Based Sea Ice Proxies in Antarctic Marine Sediments of the Past 2000 Years

Type Article
Date 2022-08
Language English
Author(s) Allen Claire S.ORCID1, Weich Zelna C.1, 2
Affiliation(s) 1 : British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, UK
2 : School of Earth and Environmental Sciences, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, UK
Source Geosciences (2076-3263) (MDPI AG), 2022-08 , Vol. 12 , N. 8 , P. 282 (34p.)
DOI 10.3390/geosciences12080282
WOS© Times Cited 1
Keyword(s) sea ice, Antarctica, late Holocene, marine sediments, diatoms, Southern Ocean

Antarctic sea ice is an essential component of the global climate system. Reconstructions of Antarctic sea ice from marine sediment cores are a vital resource to improve the representation of Antarctic sea ice in climate models and to better understand natural variability in sea ice over centennial and sub-centennial timescales. The Thomas et al. (2019) review of Antarctic sea ice reconstructions from ice and marine cores highlighted the prominence of diatom-based proxies in this research. Here, focusing solely on the diatom-based proxy records in marine sediments, we review the composition of proxies, their advantages and limitations, as well as the spatial and temporal cover of the records over the past 2 ka in order to assess the scope for future assimilation and standardization. The archive comprises 112 records from 68 marine cores, with proxies based on more than 30 different combinations of diatom taxa as well as the relatively new, highly branched isoprenoid (HBI) biomarkers.

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