Organic carbon and nitrogen composition in the sediment of the Kara Sea, Arctic Ocean during the Last Glacial Maximum to Holocene times
- Authors
- Kang, Hwa-Seong; Won, Eun-Ji; Shin, Kyung-Hoon; Yoon, Ho Il
- Issue Date
- Jun-2007
- Publisher
- American Geophysical Union
- Citation
- Geophysical Research Letters, v.34, no.12, pp.1 - 4
- Indexed
- SCIE
SCOPUS
- Journal Title
- Geophysical Research Letters
- Volume
- 34
- Number
- 12
- Start Page
- 1
- End Page
- 4
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/43616
- DOI
- 10.1029/2007GL030068
- ISSN
- 0094-8276
- 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.
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