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Stable isotopic compositions of the Antarctic bivalve in Maxwell Bay, King George Island, Antarctica: Implications for meltwater input changes

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Title
Stable isotopic compositions of the Antarctic bivalve in Maxwell Bay, King George Island, Antarctica: Implications for meltwater input changes
Other Titles
남극 킹조지섬 맥스웰만의 남극 이매패류의 안정동위원소 조성
Authors
Ahn, In-Young
Ji, Hyosun
Yoon, Ho Il
Lee, Jae Il
김진경
우경식
Keywords
Antarctic; Laternula elliptica; bivalve; meltwater; proxy
Issue Date
2009
Citation
Ahn, In-Young, et al. 2009. Stable isotopic compositions of the Antarctic bivalve in Maxwell Bay, King George Island, Antarctica: Implications for meltwater input changes. European Geosciences Union. European Geosciences Union. 2009.08.19~.
Abstract
An Antarctic clam (Laternula elliptica) which was living in shallow marine environment at the wate depth of about 25m, was collected in situ in July, 2002. Oxygen isotopic compositions clearly show six seasonal variations from 1997 to 2002. Oxygen isotopic contents show enriched values of about 3.7 (PDB) during winte and depleted values up to about 0.8. Considering the temperature range of 2 to 3 between summer and winter, this isotopic difference between summer and winter cannot be explained by temperature variations. This suggests that oxygen isotopic variations should reflect the salinity changes that were influenced by the changes of meltwater input. Especially from late 2001 to 2003, several abrupt events of low salinity can be detected from depleted oxygen isotopic values up to -2 which coincides with instrumental measured salinity values nearby. This low salinity should result from the increase in meltwater input. Therefore, this Antarctic bivalve can be used as a good proxy to reconstruct meltwater pulses in the past.
URI
http://repository.kopri.re.kr/handle/201206/7959
Conference Name
European Geosciences Union
Conference Place
European Geosciences Union
Conference Date
2009.08.19~
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