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

Author

Listed:
  • S. T. Belt

    (School of Geography, Earth and Environmental Sciences, University of Plymouth)

  • L. Smik

    (School of Geography, Earth and Environmental Sciences, University of Plymouth)

  • T. A. Brown

    (School of Geography, Earth and Environmental Sciences, University of Plymouth)

  • J.-H. Kim

    (Hanyang University ERICA Campus)

  • S. J. Rowland

    (School of Geography, Earth and Environmental Sciences, University of Plymouth)

  • C. S. Allen

    (British Antarctic Survey)

  • J.-K. Gal

    (Hanyang University ERICA Campus)

  • K.-H. Shin

    (Hanyang University ERICA Campus)

  • J. I. Lee

    (Korea Polar Research Institute)

  • K. W. R. Taylor

    (Isoprime Limited, Isoprime House)

Abstract

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.

Suggested Citation

  • S. T. Belt & L. Smik & T. A. Brown & J.-H. Kim & S. J. Rowland & C. S. Allen & J.-K. Gal & K.-H. Shin & J. I. Lee & K. W. R. Taylor, 2016. "Source identification and distribution reveals the potential of the geochemical Antarctic sea ice proxy IPSO25," Nature Communications, Nature, vol. 7(1), pages 1-10, November.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms12655
    DOI: 10.1038/ncomms12655
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    Cited by:

    1. Michael E. Weber & Ian Bailey & Sidney R. Hemming & Yasmina M. Martos & Brendan T. Reilly & Thomas A. Ronge & Stefanie Brachfeld & Trevor Williams & Maureen Raymo & Simon T. Belt & Lukas Smik & Hendri, 2022. "Antiphased dust deposition and productivity in the Antarctic Zone over 1.5 million years," Nature Communications, Nature, vol. 13(1), pages 1-18, December.

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