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Spatial distribution and origin of organic matters in an Arctic fjord system based on lipid biomarkers (n-alkanes and sterols)

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Title
Spatial distribution and origin of organic matters in an Arctic fjord system based on lipid biomarkers (n-alkanes and sterols)
Other Titles
북극 피요르드 시스템에서 지질생체지표 기반 유기물의 공간분포 및 기원 연구
Authors
Gal, Jong-Ku
Kim, Bo Kyung
Joo, Hyoung Min
Shim, Chorom
Lee, BoYeon
Kim, Il-Nam
Jung, Jinyoung
Shin, Kyung-Hoon
Ha, Sun-Yong
Subject
Environmental Sciences & EcologPublic, Environmental & Occupational Health
Keywords
SterolsLipid biomarkersTidewater glacierKongsfjordenN-alkanes
Issue Date
2022-04-01
Citation
Gal, Jong-Ku, et al. 2022. "Spatial distribution and origin of organic matters in an Arctic fjord system based on lipid biomarkers (n-alkanes and sterols)". ENVIRONMENTAL RESEARCH, 205(1): 1-10.
Abstract
The concentration of n-alkanes (C17-C35) and sterols in marine particulate matter were investigated to trace the origin of organic carbon in Kongsfjorden in early spring (April). The spatial distributions of environmental factors (seawater temperature, salinity, density, turbidity, chlorophyll a (chl. a) and particulate organic carbon (POC) concentrations) and the cell density of phytoplankton differed between the inner and outer fjord regions. In addition, brassicasterol, diatom biomarker, showed a high concentration in the outer fjord and positive correlations with the chl. a and POC concentrations in the water column. In contrast, some sterols originating from terrestrial organic matter (OM), such as stigmasterol and campesterol, showed relatively higher concentrations in the inner fjord than in the outer fjord. Based on the distance-based redundancy analysis (db-RDA) result, the distributions of organic compounds are predominantly controlled by the water density and the POC and chl. a concentrations, and these distributions allowed us to divide the inner and outer fjord regions. However, the hierarchical clustering of principal components (HCPC) results obtained based on principal component analysis (PCA) using lipid biomarkers (C17-C35 alkanes and sterols) and environmental factors indicated that the clusters were distinguished by surface (0 m) and subsurface (>4 m) seawater samples rather than by any regional division. Notably, the concentration of relatively short-chain alkanes (average chain length (ACL): 24.6 +/- 3.7) without a carbon preference for odd numbers (carbon preference index (CPI): 0.97 +/- 0.11) in the sea surface layer was significantly higher than that of subsurface seawater (ACL: 31.1 +/- 0.5 and CPI: 1.06 +/- 0.03) in the early spring. This suggests the potential of these compounds as indicators for tidewater glacier-derived OM and freshwater input by snow melt into the fjord system. Hence, these results demonstrate that the distributions of lipid biomarkers in the water column possibly provide important information for a comprehensive understanding of the origin and transport of OM in an Arctic fjord.
URI
https://repository.kopri.re.kr/handle/201206/13302
DOI
http://dx.doi.org/10.1016/j.envres.2021.112469
Type
Article
Station
Dasan Station
Indexed
SCIE
Appears in Collections  
2021-2021, Korea-Arctic Warming and Response of Ecosystem (21-21) / Yang, Eun Jin (PM21040)
2021-2021, Carbon cycle change and ecosystem response under the Southern Ocean warming (21-21) / Park, Jisoo (PE21110)
2019-2019, Carbon assimilation rate of sea ice ecosystem in the Kongsfjorden MIZ, Arctic (19-19) / Ha, Sun-Yong (PE19170)
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