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.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Belt ST,Smik L,Brown TA,Kim JH,Rowland SJ,Allen CS,Gal JK,Shin KH,Lee JI,Taylor KWdoi
10.1038/ncomms12655subject
Has Abstractpub_date
2016-08-30 00:00:00pages
12655issn
2041-1723pii
ncomms12655journal_volume
7pub_type
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