Implications of ocean acidification on micronutrient elements-iron, copper and zinc, and their primary biological impacts: A review

Marine Pollution Bulletin, Journal Year: 2024, Volume and Issue: 199, P. 115991 - 115991

Published: Jan. 10, 2024

Language: Английский

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Distributions, sources, and dynamics of particulate Ba, Cr, Sr, Zn, Mo, W, Th, and U on the Northeast Greenland Shelf

Chemical Geology, Journal Year: 2025, Volume and Issue: unknown, P. 122822 - 122822

Published: May 1, 2025

Language: Английский

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Incubation Experiments Characterize Turbid Glacier Plumes as a Major Source of Mn and Co, and a Minor Source of Fe and Si, to Seawater

Global Biogeochemical Cycles, Journal Year: 2024, Volume and Issue: 38(10)

Published: Oct. 1, 2024

Abstract Glaciers are a source of fine‐ground rock flour to proglacial and coastal marine environments. In these environments, suspended may affect light (micro)nutrient availability primary producers. Due high loads glacier flour, the particulate metal load runoff typically exceeds dissolved load. As is deposited in downstream short‐term exchange between phases have moderating influence on concentrations. Here we compare behavior iron (Fe), manganese (Mn), cobalt (Co) silica (Si) following addition different glacier‐derived sediments into seawater under conditions varying sediment (20–500 mg L −1 ), time (0.5 hr–21 days), temperature (4–11°C) exposure (dark/2,500 Lux). Despite moderately labile Fe content across all particle types (0.28–3.50 g dry sediment), only 0.27–7.13 μg was released seawater, with less efficient release as increased. Conversely, Si, Mn, Co exhibited more constant rate release, which sensitive Dissolved Si equivalent 17% ± 22% amorphous after 1–2 weeks. Mn concentrations most incubations exceeded within 1 hr despite being 12‐fold lower than content. Our results show potential for particles be large waters add growing evidence that bio‐essential affected by glacier‐associated sources.

Language: Английский

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Phytoplankton of the High-Latitude Arctic: Intensive Growth Large Diatoms Porosira glacialis in the Nansen Basin

Journal of Marine Science and Engineering, Journal Year: 2023, Volume and Issue: 11(2), P. 453 - 453

Published: Feb. 18, 2023

In August 2020, during a dramatical summer retreat of sea ice in the Nansen Basin, study phytoplankton was conducted on transect from two northern stations marginal zone (MIZ) (north 83° N m and east 38° E) through open water to southern station located Franz Victoria Trench. The presence melted polar surface waters (mPSW), (PSW), Atlantic (AW) were characteristic MIZ. There are only masses water, namely PSW AW, at southernmost station; contribution AW minimal. MIZ, first-year multiyear species noted; flora station. maximum biomass (30 g · m−3) recorded northernmost 99% consisted large diatom Porosira glacialis. Intensive growth this occurred subsurface halocline separating mPSW PSW. A thermocline formed south MIZ towards strong stratification decreases vertical nutrient fluxes, so significantly. Phytoplankton thermocline. When moving south, decreased its minimum values observed where influence is minimal or completely absent. transition silicon-limited state (MIZ area) nitrogen-limited (open water) noted.

Language: Английский

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Distribution of dissolved aluminum and dissolved iron in Kongsfjorden: A glacial fjord in the Arctic

Marine Chemistry, Journal Year: 2024, Volume and Issue: 263-264, P. 104399 - 104399

Published: May 14, 2024

Language: Английский

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Spatial Complexity in Dissolved Organic Matter and Trace Elements Driven by Hydrography and Freshwater Input Across the Arctic Ocean During 2015 Arctic GEOTRACES Expeditions

Journal of Geophysical Research Oceans, Journal Year: 2022, Volume and Issue: 127(11)

Published: Oct. 25, 2022

Abstract This study traces dissolved organic matter (DOM) in different water masses of the Arctic Ocean and its effect on distributions trace elements (TEs; Fe, Cu, Mn, Ni, Zn, Cd) using fluorescent properties DOM terrigenous biomarker lignin. The Nansen, Amundsen, Makarov Basins were characterized by influence Atlantic fluvial discharge Siberian Rivers with high concentrations (tDOM). Canada Basin Chukchi Sea Pacific water, modified through contact productive shelf sediments elevated levels marine DOM. Within surface layer Beaufort Gyre, meteoric (river precipitation) was low lignin tDOM fluorescence proxies as is removed during freezing. High‐resolution situ profiles revealed that distribution closely followed isopycnals, indicating strong sea‐ice formation melt, which also reflected correlations between brine contributions. relationship hydrography to TEs showed likely carriers Cu from Eurasian shelves into central Ocean. important sources dCd, dZn, dNi, well ligands bind carry these offshore within upper halocline Basin. Our data suggest components represent stronger relative components, potentially facilitating long‐range transport TE North Atlantic.

Language: Английский

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Sea Ice as a Factor of Primary Production in the European Arctic: Phytoplankton Size Classes and Carbon Fluxes

Journal of Marine Science and Engineering, Journal Year: 2023, Volume and Issue: 11(11), P. 2131 - 2131

Published: Nov. 8, 2023

The seasonally ice-covered marine region of the European Arctic has experienced warming and sea ice loss in last two decades. During expeditions August 2020 2021, new data on size-fractioned primary production (PP), chlorophyll a concentration, phytoplankton biomass composition carbon fixation rates dark were obtained marginal zone (MIZ) Barents Sea, Nansen Basin Greenland Sea to better understand response ecosystems ongoing climate changes. Four different situations observed study region: (i) bloom large-cell diatom Podosira glacialis, whose was trapped strong halocline at edge dense cover; (ii) chain-like colonies Thalassiosira diatoms shelf mixed waters fields shallow that could be supported by “fresh” elements polynya condition, as well terrestrial run-off drifting ices; late stage, this accompanied intensive growth Phaeocystis pouchetti; (iii) dominance small-cell under weakened stratification significant influence Atlantic water, depleted microelements silicates; (iv) dinoflagellates eutrophic water contact between masses origin clear conditions increased light intensity. >10 µm cell size group its relative contribution PP stratification, nutrient load associated with conditions. Small sizes < 2 formed basis total MIZ regardless state ice.

Language: Английский

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

Frontiers in Marine Science, Journal Year: 2023, Volume and Issue: 10

Published: Dec. 12, 2023

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 distribution dissolved bio-essential trace metals, such as copper (Cu), organic-binding ligands capable complexing it. This work reports concentrations conditional stability constants Cu-binding (L Cu log K cond Cu2+L ) measured in samples from Polarstern (PS94) expedition, part international GEOTRACES program (cruise GN04). Full-depth profile stations Barents Sea, Nansen Basin, Amundsen Basin Makarov were analysed competitive ligand exchange-adsorptive cathodic stripping voltammetry (CLE-AdCSV). basins water masses presented wide range L (range: 1.40 – 7.91 nM) values 13.83 16.01). highest variability was observed waters (≤200 m), mean increased Sea (2.15 ± 0.31 nM 1.93 0.35 nM, respectively) to (3.84 1.69 Basins (4.40± 2.03 nM). influence Transpolar Drift (TDP) flow path Basins, especially on range: 3.96 In contrast, (&gt;200 m) showed no significant differences between terms 1.45 2.78 14.02 15.46). presence strong (log &gt;13) stabilises excess (dCu) transported TPD favours its export Fram Strait Nordic Seas.

Language: Английский

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Dissolved, Labile, and Total Particulate Trace Metal Dynamics on the Northeast Greenland Shelf

Global Biogeochemical Cycles, Journal Year: 2022, Volume and Issue: 36(12)

Published: Nov. 24, 2022

Abstract We present high‐resolution profiles of dissolved, labile, and total particulate trace metals (TMs) on the Northeast Greenland shelf from GEOTRACES cruise GN05 in August 2016. Combined with radium isotopes, stable oxygen noble gas measurements, elemental distributions suggest that TM dynamics were mainly regulated by mixing between North Atlantic‐derived Intermediate Water, enriched labile TMs (LpTMs), Arctic surface waters, Siberian shelf‐derived dissolved (dTMs; Co, Cu, Fe, Mn, Ni) carried Transpolar Drift. These two distinct sources delineated salinity‐dependent variations dTM LpTM concentrations proportion dTMs relative to ratios. Locally produced meltwater Nioghalvfjerdsbræ (79NG) glacier cavity, distinguished other freshwater using helium excess, contributed a large pool inventory. Localized peaks Cd, Ni, Al, V, Ti cavity outflow, however, not directly submarine melting. Instead, these supplied re‐suspension sediment particles. Currently, Ocean outflows are most important source dFe, dCu, dNi shelf, while LpTMs up 60% dMn dCo subglacial discharge 79NG cavity. Therefore, changes cavity‐overturning induced glacial retreat, alterations transport materials Transport Drift may shift dTM‐LpTM stoichiometry future.

Language: Английский

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Distribution of dissolved trace elements in the Laptev Sea affected by the Lena River discharge

Marine Pollution Bulletin, Journal Year: 2024, Volume and Issue: 202, P. 116397 - 116397

Published: April 20, 2024

Language: Английский

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