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Organic carbon and nitrogen composition in the sediment of the Kara Sea, Arctic Ocean during the Last Glacial Maximum to Holocene times

Title
Organic carbon and nitrogen composition in the sediment of the Kara Sea, Arctic Ocean during the Last Glacial Maximum to Holocene times
Author
신경훈
Keywords
CONTINENTAL-MARGIN; ANNA TROUGH; MATTER; ACCUMULATION; DEGLACIATION; ATLANTIC; PACIFIC
Issue Date
2007-06
Publisher
AMER GEOPHYSICAL UNION
Citation
GEOPHYSICAL RESEARCH LETTERS, v. 34, No. 12, Article no. L12607
Abstract
A sharp decrease in C-org/N-tot ratios and apparently heavier stable isotope ratios of C-org and N-tot (delta C-13(org) and delta N-15(tot)) after deglaciation were observed in sediment cores St-25 and St-34 collected from the Saint Anna Trough in the Kara Sea, exhibiting a change of sediment origin from terrestrial to marine during the LGM and Holocene times. Organic nitrogen (N-org) contributed about 40% to total nitrogen (N-tot) during the Holocene, but the Norg fraction was hardly observed in the lower LGM sediments ( below 120 cm depth in St-25 and beneath 170 cm in St-34). This may be due to a permanent cover of sea ice in the area during the LGM. In addition, the delta C-13 values for OClabile and OCresi were remarkably different between LGM and Holocene sediment. The unexpected lighter delta C-13 values for OCresi for the LGM period might be due to methanotrophic bacteria in the sediment of Kara Sea.
URI
https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2007GL030068http://repository.hanyang.ac.kr/handle/20.500.11754/106608
ISSN
0094-8276; 1944-8007
DOI
10.1029/2007GL030068
Appears in Collections:
COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY[E](과학기술융합대학) > MARINE SCIENCE AND CONVERGENCE ENGINEERING(해양융합공학과) > Articles
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