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Tracing riverine dissolved organic carbon and its transport to the halocline layer in the Chukchi Sea (western Arctic Ocean) using humic-like fluorescence fingerprinting

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Title
Tracing riverine dissolved organic carbon and its transport to the halocline layer in the Chukchi Sea (western Arctic Ocean) using humic-like fluorescence fingerprinting
Other Titles
서북극 척치해에서의 휴믹계 형광특성을 활용한 하천기원 용존 유기탄소화합물의 염분약층으로의 수송 추적
Authors
Jung, Jinyoung
Son, Jin Eui
Lee, Yun Kyung
Cho, Kyoung-Ho
Lee, Youngju
Yang, Eun Jin
Kang, Sung-Ho
Hur, Jin
Subject
Environmental Sciences & Ecology
Keywords
Riverine DOC; Humic-like fluorescence; River water; Chukchi Sea; Western Arctic
Issue Date
2021-06
Citation
Jung, Jinyoung, et al. 2021. "Tracing riverine dissolved organic carbon and its transport to the halocline layer in the Chukchi Sea (western Arctic Ocean) using humic-like fluorescence fingerprinting". SCIENCE OF THE TOTAL ENVIRONMENT, 772(1): 1-12.
Abstract
Dissolved organic carbon (DOC) and the fluorescence properties of dissolved organic matter (FDOM) were inves- tigated using parallel factor analysis (PARAFAC) for seawater samples collected in the Chukchi Sea (65°N?78°N, 170°E?160°W) during summer 2017. River water (friver) and sea-ice meltwater (fsea ice melt) fractions were also derived using oxygen isotopes ratios (δ18O) to examine the influence of sea ice on riverine DOM. The spatial dis- tributions of friver, riverine DOC, and the humic-like fluorescent component (C1) showed an overall south-north gradient, with higher values in the northern Chukchi Sea in summer. Pronounced accumulation of river water and riverine DOM was also observed in the anticyclonic Beaufort Gyre at the eastern stations of the northern Chukchi Sea in association with a long water residence time. Estimated riverine DOC in the surface layer accounted for 27 ± 9% (range: 17?47%) of the total DOC in the southern Chukchi Sea, and 39 ± 6% (range: 32?49%) and 31 ± 4% (range: 25?37%) for the eastern and western stations of the northern Chukchi Sea, respec- tively. Humic-like C1 showed negative and positive relationships with sea-ice meltwater-corrected salinity (Ssim_corrected) and friver, respectively. However, Arctic river waters with distinct humic-like C1 characteristics were likely mixed in the northern Chukchi Sea. The vertical distributions of riverine DOC, humic-like C1 fluores- cence, and friver generally decreased with water depth, reflecting the strong influence of riverine DOM in the sur- face layer. Although riverine DOM and friver were dominant in the upper 50 m of the water column, they were also pronounced in the upper halocline (50?200 m), in which fsea ice melt dropped below zero. Our results indicated the existence of brine rejected from growing sea ice, and that sea-ice formation was a key factor for the transport of riverine DOM to the upper halocline layer in the northern Chukchi Sea.
URI
https://repository.kopri.re.kr/handle/201206/11777
DOI
http://dx.doi.org/10.1016/j.scitotenv.2021.145542
Appears in Collections  
2020-2020, Korea-Arctic Ocean Observing System(K-AOOS) (20-20) / Kang, Sung-Ho (PM20040)
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