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- Title
Tracing terrestrial organic matter along the Mackenzie Trough in the Beaufort Sea.
- Authors
Kim, Dahae; Kim, Jung-Hyun; Kang, Sujin; Park, Kwangkyu; Lee, Dong-Hun; Jin, Young Keun; Nam, Seung-Il; Shin, Kyung-Hoon
- Abstract
Recent Arctic warming accelerates the release of vast amounts of organic carbon fromthe terrestrial permafrost to the Arctic Ocean, having the potential to affect Arcticbiogeochemical carbon cycles. The Mackenzie River is one of the largest rivers draining intothe Arctic Ocean and the most important source of terrestrial freshwater and sediment inputto the Beaufort Sea. In this study, we investigated surface sediments collected along theMackenzie Trough during the ARA04C, ARA05C, and ARA08C expeditions of the Koreanice-breaker R/V ARAON in the Canadian Beaufort Sea in 2013, 2014, and 2017,respectively. We analyzed the samples for bulk (TOC, TON, C/N ratio, δ13CTOC, andδ15NTON) and molecular (concentrations and δ13C of n-alkanes) parameters to trace theterrestrial organic matter input from the Mackenzie River to the Beaufort Sea. Inaddition, we analyzed the radiocarbon content (Δ14C) to calculate the petrogeniccontribution of OC to the total OC pool. Our results provide information on the effect ofthawing permafrost and thus the contribution of the activated old OC along theMackenzie Trough. (Corresponding author: J.-H. Kim, jhkim123@kopri.re.kr)
- Subjects
ORGANIC compounds; ALKANES; CARBON cycle; SEAS; CARBON isotopes; PERMAFROST; OCEAN
- Publication
Geophysical Research Abstracts, 2019, Vol 21, p1
- ISSN
1029-7006
- Publication type
Article