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

Jung, Jinyoung; Son, Jin Eui; Lee, Yun Kyung; Cho, Kyoung‐Ho; Lee, Youngju; Yang, Eun Jin; Kang, Sung‐Ho; Hur, Jin

doi:10.1016/j.scitotenv.2021.145542

Cited by 17 publications

(44 citation statements)

References 92 publications

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“…Surface bulk DOC concentrations ranged from 65 to 83 μM C, with an average of 71 ± 4.4 μM C (Figure 7a), which is similar to values previously observed in the western Arctic during summer (Jung, Son, et al, 2021;Letscher et al, 2011;Tanaka et al, 2016). The surface bulk DOC concentration showed no clear distinction in distribution between the CBL/NCS (range: 65-76 μM C and mean: 70 ± 3.2 μM C) and ESS/MR regions (range: 66-83 μM C and mean: 74 ± 5.0 μM C), unlike other variables such as SSS and 𝐴𝐴 𝐴𝐴rw .…”

Section: Surface Distributions Of Riverine and Marine Docsupporting

confidence: 86%

“…In this section, we compare our results with previous studies carried out in the western Arctic Ocean. Although there have been few observations for riverine and marine DOC in our study region, we can compare the previously published from the IBR/V Araon cruise conducted in the summer of 2017 Jung, Son, et al, 2021).…”

Section: Comparison With Previous Studiesmentioning

confidence: 94%

“…The three end-member values of δ 18 O and S used for the calculation are summarized in Table 1, together with the observed data from previous studies. The details behind the choice of end-member values can be found in Jung, Son, et al (2021) and other references (e.g., Bauch, 1995;Ekwurzel et al, 2001;Eicken et al, 2002;Pfirman et al, 2004;Mathis et al, 2007;Cooper et al, 2008;Yamamoto-Kawai et al, 2008;Logvinova et al, 2016). In brief, the S of river water, sea ice meltwater, and seawater were 0, 4, 34.8 psu, respectively, and the δ 18 O end-members −20‰, −2‰, and 0.28‰, respectively.…”

Section: Freshwater Componentsmentioning

confidence: 99%

“…Although bulk DOC concentration provides quantitative information regarding DOC production (or input) and consumption (or loss), previous studies have shown that the seasonal production of bioavailable marine DOC via primary production as well as the influence of riverine DOC is not apparently reflected in bulk DOC distribution in the western Arctic Ocean (e.g., the Chukchi and Beaufort Seas) (e.g., Davis & Benner, 2005; DeFrancesco & Guéguen, 2021; Jung, Son, et al., 2021; Mathis et al., 2007; Shen et al., 2012). For example, Davis and Benner (2005) reported that concentrations of bulk DOC did not exhibit a significant seasonal change in surface water of the Canada Basin, but dissolved amino acids concentrations (indicators of bioavailable DOC) increased by 45% between spring and summer.…”

Section: Introductionmentioning

confidence: 99%

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Spatial Distributions of Riverine and Marine Dissolved Organic Carbon in the Western Arctic Ocean: Results From the 2018 Korean Expedition

et al. 2022

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Seasonal primary production and river discharge increases in the Arctic Ocean exert a significant influence on the dissolved organic carbon (DOC) cycle. To improve our knowledge of the spatial heterogeneity of DOC source and concentration in the rapidly changing Arctic Ocean, we investigated the distributions of riverine and marine DOC in the western Arctic Ocean during the summer of 2018. Although the surface bulk DOC concentration indicated no clear distinction in its distribution between the Chukchi Borderland (CBL)/northern Chukchi Sea (NCS) and East Siberian Sea (ESS)/Mendeleyev Ridge (MR) regions, the estimated riverine DOC concentration (28 ± 4.2 μM C) and its contribution (40 ± 5.7%) in the surface layer of the CBL/NCS region were higher than those (19 ± 5.6 μM C and 26 ± 8.5%) in the ESS/MR region, which was attributed to the accumulation of freshwater, strong stratification, and a longer residence time in the CBL/NCS region. In contrast, although marine DOC was the dominant DOC component in both the CBL/NCS and ESS/MR regions, the higher marine DOC concentration (54 ± 8.1 μM C) and its contribution (73 ± 8.2%) in the East Siberian shelf/slope region were consistent with high bacterial abundance, which was associated with extremely high surface phytoplankton blooms sustained by nutrient supply from the deep layer, suggesting that the supply of bioavailable DOC resulted in active bacterial activities. Overall, the spatial differences in water properties between the two regions had large influences on the regional distributions of riverine and marine DOC.

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Section: Surface Distributions Of Riverine and Marine Docsupporting

confidence: 86%

Section: Comparison With Previous Studiesmentioning

confidence: 94%

Section: Freshwater Componentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spatial Distributions of Riverine and Marine Dissolved Organic Carbon in the Western Arctic Ocean: Results From the 2018 Korean Expedition

et al. 2022

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“…Two seawater endmembers were considered to investigate the effect of riverine water on our TA EX : Pacific Winter Water in the Chukchi Sea (S = 32.99 and TA = 2269 µmol kg −1 ; Qi et al, 2017) and the same seawater but diluted by 10% with river water (S = 0 and TA = 1048 µmol kg −1 ). The 10% contribution of river waters was chosen based on Jung et al (2021) conducted in the same cruise. Three points, including zero salinity and TA values, form a triangle zone between the two lines shown in Figure 3C.…”

Section: Excess Total Alkalinity In Sea Icementioning

confidence: 99%

Impact of Sea Ice Melting on Summer Air-Sea CO2 Exchange in the East Siberian Sea

Yang

Kang

et al. 2022

Front. Mar. Sci.

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The role of sea ice melting on the air-sea CO2 flux was investigated at two ice camps in the East Siberian Sea of the Arctic Ocean. On average, sea ice samples from the two ice camps had a total alkalinity (TA) of ∼108 and ∼31 μmol kg–1 and a corresponding salinity of 1.39 and 0.36, respectively. A portion (18–23% as an average) of these sea ice TA values was estimated to exist in the sea ice with zero salinity, which indicates the excess TA was likely attributed to chemical (CaCO3 formation and dissolution) and biological processes in the sea ice. The dilution by sea ice melting could increase the oceanic CO2 uptake to 11–12 mmol m–2 d–1 over the next 21 days if the mixed layer depth and sea ice thickness were assumed to be 18.5 and 1.5 m, respectively. This role can be further enhanced by adding TA (including excess TA) from sea ice melting, but a simultaneous release of dissolved inorganic carbon (DIC) counteracts the effect of TA supply. In our study region, the additional impact of sea ice melting with close to unity TA:DIC ratio on air-sea CO2 exchange was not significant.

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A river of terrestrial dissolved organic matter in the upper waters of the central Arctic Ocean

Gamrani

Eert

Williams

et al. 2023

Deep Sea Research Part I: Oceanographic Research Papers

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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

Cited by 17 publications

References 92 publications

Spatial Distributions of Riverine and Marine Dissolved Organic Carbon in the Western Arctic Ocean: Results From the 2018 Korean Expedition

Spatial Distributions of Riverine and Marine Dissolved Organic Carbon in the Western Arctic Ocean: Results From the 2018 Korean Expedition

Impact of Sea Ice Melting on Summer Air-Sea CO2 Exchange in the East Siberian Sea

A river of terrestrial dissolved organic matter in the upper waters of the central Arctic Ocean

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