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

Title
Source identification and distribution reveals the potential of the geochemical Antarctic sea ice proxy IPSO25
Author
신경훈
Keywords
HIGHLY BRANCHED ISOPRENOIDS; LAND-FAST ICE; SOUTHERN-OCEAN; MCMURDO SOUND; PLATELET ICE; WEDDELL SEA; DIATOM ASSEMBLAGES; SURFACE SEDIMENTS; EAST ANTARCTICA; ORGANIC-MATTER
Issue Date
2016-08
Publisher
NATURE PUBLISHING GROUP
Citation
NATURE COMMUNICATIONS, v. 7, Article no. 12655
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.
URI
https://www.nature.com/articles/ncomms12655http://hdl.handle.net/20.500.11754/68021
ISSN
2041-1723
DOI
10.1038/ncomms12655
Appears in Collections:
COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY[E](과학기술융합대학) > MARINE SCIENCE AND CONVERGENCE ENGINEERING(해양융합공학과) > Articles
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