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

Gamrani, M.; Eert, Jane; Williams, William J.; Guéguen, Céline

doi:10.1016/j.dsr.2023.104016

Cited by 4 publications

(1 citation statement)

References 82 publications

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“…The log K cond Cu2+L values observed in the study area (range: 13.83 -16.01, Table 1) were close to the range of terrestrial humic substances reported in estuaries (range: 14.9 -15.9, Muller and Batchelli, 2013). Humics substances with riverine origin were detected in the central Arctic waters (Gao and Gueǵuen, 2018;Gamrani et al, 2023) and described as part of the Fe-binding ligands pool in the central Arctic and Fram Strait waters (Slagter et al, 2017;Rijkenberg et al, 2018;Laglera et al, 2019;Slagter et al, 2019;Ardiningsih et al, 2020). Since humics can complex both Fe and Cu (Abualhaija et al, 2015), it is reasonable to propose that a fraction of the L Cu pool in the study area comprises humic substances, as suggested for Fram Strait and Greenland shelf waters (Arnone et al, 2023).…”

Section: Cu-binding Ligand Naturesupporting

confidence: 77%

Natural copper-binding ligands in the Arctic Ocean. The influence of the Transpolar Drift (GEOTRACES GN04)

Arnone,

Santana-Casiano,

González-Dávila

et al. 2023

Front. Mar. Sci.

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The Arctic Ocean is a unique biogeochemical environment characterized by low salinity surface waters, extensive sea-ice coverage, high riverine inputs, large shelf extension and the long residence time of deep waters. These characteristics determine the distribution of dissolved bio-essential trace metals, such as copper (Cu), and the dissolved organic-binding ligands capable of complexing it. This work reports the concentrations and conditional stability constants of dissolved Cu-binding ligands (LCu and log KcondCu2+L) measured in samples from the Polarstern (PS94) expedition, as part of the international GEOTRACES program (cruise GN04). Full-depth profile stations from the Barents Sea, Nansen Basin, Amundsen Basin and Makarov Basin were analysed by competitive ligand exchange-adsorptive cathodic stripping voltammetry (CLE-AdCSV). The basins and water masses presented a wide range of LCu concentrations (range: 1.40 – 7.91 nM) and log KcondCu2+L values (range: 13.83 – 16.01). The highest variability of Cu-binding ligand concentrations was observed in surface waters (≤200 m), and mean concentrations increased from the Barents Sea and Nansen Basin (2.15 ± 0.31 nM and 1.93 ± 0.35 nM, respectively) to the Amundsen (3.84 ± 1.69 nM) and Makarov Basins (4.40± 2.03 nM). The influence of the Transpolar Drift (TDP) flow path was observed in the Amundsen and Makarov Basins, especially on Cu-binding ligand concentrations (LCu range: 3.96 – 7.91 nM). In contrast, deep waters (>200 m) showed no significant differences between basins and water masses in terms of LCu concentrations (range: 1.45 – 2.78 nM) and log KcondCu2+L (range: 14.02 – 15.46). The presence of strong Cu-binding ligands (log KcondCu2+L>13) in surface waters stabilises the excess of dissolved copper (dCu) transported in the TPD and favours its export to the Fram Strait and Nordic Seas.

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Section: Cu-binding Ligand Naturesupporting

confidence: 77%

Natural copper-binding ligands in the Arctic Ocean. The influence of the Transpolar Drift (GEOTRACES GN04)

Arnone,

Santana-Casiano,

González-Dávila

et al. 2023

Front. Mar. Sci.

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Connectivity between Siberian river runoff and the lower limb of the Atlantic Meridional Overturning Circulation

Gjelstrup,

Myers,

Lee

et al. 2024

Limnology & Oceanography

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Freshwater from the Arctic participates in the globally important Atlantic Meridional Overturning Circulation (AMOC). We use high‐resolution, in situ observations of dissolved organic matter (DOM) fluorescence to trace the origins of freshwater and organic carbon in the densest component of the AMOC, namely Denmark Strait Overflow Water (DSOW). We find a distinct terrestrial DOM signal in DSOW and trace it upstream to the Siberian shelves in the Arctic Ocean. This implies a riverine origin of freshwater in DSOW. We estimate that the Siberian Shelf water contribution constitutes approximately 1% of DSOW. Ocean circulation modeling confirms the inferred pathway and highlights Denmark Strait as an important location for the entrainment of the riverine signal into DSOW. Our proposed method can be deployed on a range of observing systems to elucidate freshwater dispersion across the Arctic and subarctic, thereby contributing to the broader discussion on freshwater impacts and organic carbon sequestration in the AMOC.

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Unveiling the protective role of biofilm formation on the photoaging of microplastics

Zhang,

Liu,

Zhang

et al. 2024

Sci. China Technol. Sci.

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

Cited by 4 publications

References 82 publications

Natural copper-binding ligands in the Arctic Ocean. The influence of the Transpolar Drift (GEOTRACES GN04)

Natural copper-binding ligands in the Arctic Ocean. The influence of the Transpolar Drift (GEOTRACES GN04)

Connectivity between Siberian river runoff and the lower limb of the Atlantic Meridional Overturning Circulation

Unveiling the protective role of biofilm formation on the photoaging of microplastics

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