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

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

doi:10.1038/ncomms12655

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

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

^*Corresponding author for this work

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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.

Original language	English
Pages (from-to)	0-0
Number of pages	0
Journal	Nature Communications
Volume	7
Issue number	0
DOIs	https://doi.org/10.1038/ncomms12655
Publication status	Published - 30 Aug 2016

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title = "Source identification and distribution reveals the potential of the geochemical Antarctic sea ice proxy IPSO25",

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.",

author = "Belt, {S. T.} and L. Smik and Brown, {T. A.} and Kim, {J. H.} and Rowland, {S. J.} and Allen, {C. S.} and Gal, {J. K.} and Shin, {K. H.} and Lee, {J. I.} and Taylor, {K. W.R.}",

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T1 - Source identification and distribution reveals the potential of the geochemical Antarctic sea ice proxy IPSO25

AU - Belt, S. T.

AU - Smik, L.

AU - Brown, T. A.

AU - Kim, J. H.

AU - Rowland, S. J.

AU - Allen, C. S.

AU - Gal, J. K.

AU - Shin, K. H.

AU - Lee, J. I.

AU - Taylor, K. W.R.

PY - 2016/8/30

Y1 - 2016/8/30

N2 - 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.

AB - 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.

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DO - 10.1038/ncomms12655

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SN - 2041-1723

VL - 7

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EP - 0

JO - Nature Communications

JF - Nature Communications

IS - 0

ER -

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

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