Biogeochemical Cycling of Dissolved Zinc in the Western Arctic (Arctic GEOTRACES GN01)

Jensen, Laramie T.; Wyatt, Neil J.; Twining, Benjamin S.; Rauschenberg, Sara; Landing, William M.; Sherrell, Robert M.; Fitzsimmons, Jessica N.

doi:10.1029/2018gb005975

Cited by 25 publications

(67 citation statements)

References 130 publications

(239 reference statements)

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“…We are unaware of any δ 66 Zn data from dissolved Zn in the Arctic. However, a recent study on Western Arctic dissolved Zn concentrations highlighted a deviation of Zn concentration vertical profiles from the nutrient-type Zn profiles observed in the Atlantic and Pacific 71 . These authors documented higher than global average surface Zn concentrations (~1.1 nmol kg -1 ) with a maximum concentration at 200 m and uniformly lower concentrations in the deep water.…”

Section: Isotopic Contextmentioning

confidence: 93%

“…These authors documented higher than global average surface Zn concentrations (~1.1 nmol kg -1 ) with a maximum concentration at 200 m and uniformly lower concentrations in the deep water. Jensen et al 71 hypothesises that Western Arctic surface water dissolved Zn originates primarily from incoming Pacific waters that are modified by shelf sediment fluxes from remineralised Zn-rich phytoplankton.…”

Section: Isotopic Contextmentioning

confidence: 99%

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Zinc isotopes from archaeological bones provide reliable trophic level information for marine mammals

et al. 2021

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In marine ecology, dietary interpretations of faunal assemblages often rely on nitrogen isotopes as the main or only applicable trophic level tracer. We investigate the geographic variability and trophic level isotopic discrimination factors of bone zinc 66Zn/64Zn ratios (δ66Zn value) and compared it to collagen nitrogen and carbon stable isotope (δ15N and δ13C) values. Focusing on ringed seals (Pusa hispida) and polar bears (Ursus maritimus) from multiple Arctic archaeological sites, we investigate trophic interactions between predator and prey over a broad geographic area. All proxies show variability among sites, influenced by the regional food web baselines. However, δ66Zn shows a significantly higher homogeneity among different sites. We observe a clear trophic spacing for δ15N and δ66Zn values in all locations, yet δ66Zn analysis allows a more direct dietary comparability between spatially and temporally distinct locations than what is possible by δ15N and δ13C analysis alone. When combining all three proxies, a more detailed and refined dietary analysis is possible.

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Section: Isotopic Contextmentioning

confidence: 93%

Section: Isotopic Contextmentioning

confidence: 99%

Zinc isotopes from archaeological bones provide reliable trophic level information for marine mammals

et al. 2021

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“… Cryospheric sampling sites map, U.S. Arctic GEOTRACES GN01 cruise (2015). Relevant ice stations are shown as red dots, and full‐water column stations are shown as smaller black dots (dissolved seawater data found in Jensen et al., 2019 for Zn, Zhang et al., 2020 for Cd, and Jensen, Morton, et al., 2020 for Fe and Mn). Snow, sea ice, and under‐ice seawater samples were collected at Stations 31, 33, 39, 42, 43, and 46, and melt pond samples were taken at these same stations except Station 31.…”

Section: Methodsmentioning

confidence: 99%

Biogeochemical Cycling of Colloidal Trace Metals in the Arctic Cryosphere

et al. 2021

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The surface waters of the Arctic Ocean include an important inventory of freshwater from rivers, sea ice melt, and glacial meltwaters. While some freshwaters are mixed directly into the surface ocean, cryospheric reservoirs, such as snow, sea ice, and melt ponds act as incubators for trace metals, as well as potential sources to the surface ocean upon melting. The availability and reactivity of these metals depends on their speciation, which may vary across each pool or undergo transformation upon mixing. We present here baseline measurements of colloidal (∼0.003–0.200 μm) iron (Fe), zinc (Zn), nickel (Ni), copper (Cu), cadmium (Cd), and manganese (Mn) in snow, sea ice, melt ponds, and the underlying seawater. We consider both the total concentration of colloidal metals ([cMe]) in each cryospheric reservoir and the contribution of cMe to the overall dissolved metal phase (%cMe). Notably, snow contained higher (cMe) as well as higher %cMe relative to seawater for metals such as Fe and Zn across most stations. Stations close to the North Pole had relatively high aerosol deposition, imparting high (cFe) and (cZn), as well as high %cFe, %cZn, %cMn, and %cCd (>80%). In contrast, surface seawater concentrations of Cd, Cu, Mn, and Ni were dominated by the soluble phase (<0.003 μm), suggesting little impact of cMe from the melting cryosphere, or rapid aggregation/disaggregation dynamics within surface waters leading to the loss of cMe. This has important implications for how trace metal biogeochemistry speciation and thus fluxes may change in a future ice‐free Arctic Ocean.

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“…In the eastern Arctic, subsurface halocline water and eddies are important physical processes to transport materials into basin waters, while in western Arctic, the TPD can directly transport river-influenced shelf water from Siberian shelves toward the center of the basin. Previous studies have shown Siberian shelf-derived 228 Ra, Fe, and Zn was transported by the TPD and found in central Arctic (Jensen et al, 2019;Kipp et al, 2018;Rutgers van der Loeff et al, 2018;Slagter et al, 2017). Enriched dissolved Co, Cu, Ni, and Fe concentrations were also found in the TPD, and the authors argued that organic complexation of those metals, as their speciation study in seawater often shows, can keep them stable and transported over long distances (Bundy et al, 2020;Charette et al, 2020).…”

Section: Transport and Accumulation Mechanismmentioning

confidence: 95%

Enrichment of Trace Metals (V, Cu, Co, Ni, and Mo) in Arctic Sediments—From Siberian Arctic Shelves to the Basin

Wang

Ren

et al. 2021

JGR Oceans

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The Arctic Ocean has an area of approximately 9.5 × 10 12 m 2 ; more than half of its area comprises shallow continental shelf seas (Jakobsson, 2002). Among the shelves, the widest and shallowest shelf in the World Ocean, Siberian shelves are especially important not only because their geomorphology makes the biogeochemical recycling processes more susceptible to sediment-water exchange processes, but also because they are among the most influenced by the changing climate, that is, redox environment changes (Gobeil Abstract With 50% of the Arctic Ocean is consisted of continental shelves, extensive shelf-basin exchange processes exist here and plays a key role in regulating the biogeochemical recycling process of trace metals in the Arctic region. In this study, short sediment cores were collected along three transects from Siberian-Chukchi shelves to adjacent slope/basin areas. An increasing trend was found for the bulk concentrations of several metals (V, Cu, Co, Ni, and Mo) from shelf to slope/basin cores with increasing water depth. Sequential extraction experiments indicated that the Fe/Mn oxide fractions increased significantly from shelf (9%-21%) to basin cores (24%-76%) for Cu, Co, Ni, and V, while the organic/sulfide phase remained significant (∼40%) for Mo. In addition, the observed dissolved metal concentrations in porewater indicated the remobilization of Fe, Mn, and Mo from shelf sediment, while V was always removed from water to the sediment, both on the shelf or in the slope/basin. Overall, in combination with the statistical analysis, we proposed that metals are transported from shelves to the central Arctic and are scavenged mainly by Mn oxides from the water column, which results in the enrichment of metals in slope/basin sediment. With the climate change, such transport and accumulation mechanism may be intensified over time, slowly leading the Arctic sediment to be a more and more important sink for those metals.Plain Language Summary Siberian shelves in the Arctic Ocean are the widest and shallowest shelves in the World Ocean. Recently published studies on dissolved trace metals in Arctic waters and sediments indicated that intensive shelf-basin interactions play a key role in regulating the geochemical recycling process of trace metals in this region. However, the transport and accumulation mechanism of metals in the adjacent slope/basin sediments are not well known, especially lacking evidence from the sediment aspect. In this study, short sediment cores were collected along three transects from Siberian-Chukchi shelves to adjacent slope/basin areas with increasing water depth. An increasing trend of the bulk concentrations for several trace metals (V, Mo, Cu, Co, and Ni) was found from shelf cores to slope/basin cores, and the Fe/Mn oxide fraction of those metals increased significantly in slope/basin cores compared to shelf cores. In addition, dissolved metal profiles in porewater indicated remobilization (Fe, Mn, Mo) and scavenging (V) processes of different metals in shelf sediments. In...

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Biogeochemical Cycling of Dissolved Zinc in the Western Arctic (Arctic GEOTRACES GN01)

Cited by 25 publications

References 130 publications

Zinc isotopes from archaeological bones provide reliable trophic level information for marine mammals

Zinc isotopes from archaeological bones provide reliable trophic level information for marine mammals

Biogeochemical Cycling of Colloidal Trace Metals in the Arctic Cryosphere

Enrichment of Trace Metals (V, Cu, Co, Ni, and Mo) in Arctic Sediments—From Siberian Arctic Shelves to the Basin

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