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Source identification and distribution reveals the potential of the geochemical Antarctic sea ice proxy IPSO25

Belt, S.T.; Smik, L.; Brown, T.A.; Kim, J.-H.; Rowland, S.J.; Allen, C.S.; Gal, J.-K.; Shin, K.-H.; Lee, J.I.; Taylor, K.W.R.. 2016 Source identification and distribution reveals the potential of the geochemical Antarctic sea ice proxy IPSO25. Nature Communications, 7, 12655. 10.1038/ncomms12655

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Abstract/Summary

The presence of a di-unsaturated highly branched isoprenoid (HBI) lipid biomarker (diene II) in Southern Ocean sediments has previously been proposed as a proxy measure of palaeo Antarctic sea ice. Here we show that a source of diene II is the sympagic diatom Berkeleya adeliensis Medlin. Furthermore, the propensity for B. adeliensis to flourish in platelet ice is reflected by an offshore downward gradient in diene II concentration in >100 surface sediments from Antarctic coastal and near-coastal environments. Since platelet ice formation is strongly associated with super-cooled freshwater inflow, we further hypothesize that sedimentary diene II provides a potentially sensitive proxy indicator of landfast sea ice influenced by meltwater discharge from nearby glaciers and ice shelves, and re-examination of some previous diene II downcore records supports this hypothesis. The term IPSO25—Ice Proxy for the Southern Ocean with 25 carbon atoms—is proposed as a proxy name for diene II.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1038/ncomms12655
Programmes: BAS Programmes > BAS Programmes 2015 > Palaeo-Environments, Ice Sheets and Climate Change
ISSN: 20411723
Additional Keywords: cryospheric science, geochemistry, palaeoceanography
Date made live: 31 Oct 2016 09:02 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/513424

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