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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

Cited 6 time in scopus
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Title
Organic carbon and nitrogen composition in the sediment of the Kara Sea, Arctic Ocean during the Last Glacial Maximum to Holocene times
Other Titles
마지막 최대빙하기에서 홀로세 동안 북극 카라해 퇴적물의 유기탄소 및 질소 조성 연구
Authors
Won, Eun-Ji
Kang, Hwa-Seong
Yoon, Ho Il
Shin, Kyung-Hoon
Subject
Geology
Keywords
Arctic Ocean; Kara Sea; LGM; carbon and nitrogen fractions; stable isotope
Issue Date
2007
Publisher
AGU
Citation
Won, Eun-Ji, et al. 2007. "Organic carbon and nitrogen composition in the sediment of the Kara Sea, Arctic Ocean during the Last Glacial Maximum to Holocene times". Geophysical Research Letters, 34(1): L12607-L12607.
Abstract
A sharp decrease in Corg/Ntot ratios and apparently heavier stable isotope ratios of Corg and Ntot (δ 13Corg and δ 15Ntot) 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 (Norg) contributed about 40% to total nitrogen (Ntot) 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 δ 13C values for OClabile and OCresi were remarkably different between LGM and Holocene sediment. The unexpected lighter δ 13C values for OCresi for the LGM period might be due to methanotrophic bacteria in the sediment of Kara Sea.
URI
http://repository.kopri.re.kr/handle/201206/6339
DOI
http://dx.doi.org/10.1029/2007GL030068
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