Phytoplankton response to increased nickel in the context of ocean alkalinity enhancement

Biogeosciences, Journal Year: 2024, Volume and Issue: 21(3), P. 761 - 772

Published: Feb. 12, 2024

Abstract. Ocean alkalinity enhancement (OAE) is considered one of the most promising approaches to actively remove carbon dioxide (CO2) from atmosphere by accelerating natural process rock weathering. This approach involves introducing alkaline substances sourced mineral deposits, such as olivine, basalt, and carbonates or obtained industrial waste products steel slag, into seawater dispersing them over coastal areas. Some these contain trace metals, which would be released oceans along with enhancement. The metals could serve micronutrients for marine organisms at low concentrations but potentially become toxic high concentrations, adversely affecting biota. To comprehensively assess feasibility OAE, it crucial understand how phytoplankton, forms base food webs, responds ocean alkalinization associated metal perturbations. As abundant in OAE source materials, understanding impacts nickel (Ni) on phytoplankton critical assessment. In this study, we investigated influence three representative species a gradient nine Ni (from 0 100 µmol L−1 12 synthetic organic ligand). elevated varied among tested species. coccolithophore Emiliania huxleyi dinoflagellate Amphidinium carterae exhibited growth rate inhibition about 30 % 20 %, respectively, highest concentrations. half maximal inhibitory concentration (IC50, inhibited 50 %) both exceeded range Ni. suggests that were only mildly affected contrast, diatom Thalassiosira weissflogii displayed considerably higher sensitivity Ni, 60 an IC50 value 63.9 L−1. conclusion, variability exposure applications Ni-rich materials caution required thresholds must avoided.

Language: Английский

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Particulate Cadmium Accumulation in the Mesopelagic Ocean

Global Biogeochemical Cycles, Journal Year: 2025, Volume and Issue: 39(1)

Published: Jan. 1, 2025

Abstract Observations of dissolved cadmium (dCd) and phosphate (PO 4 ) suggest an unexplained loss dCd to the particulate phase in tropical oxyclines. Here, we compile existing observations Cd phosphorus (P), present new data from US GEOTRACES GP15 Pacific Meridional Transect examine this phenomenon a perspective. We use simple algorithm reproduce station depth profiles P via regeneration possible subsurface accumulation. Our examination reveals decoupling driven by variable partitioning between two pools with differing labilities. Further, identify evidence for accumulation at 31 stations. Subsurface occurs most consistently mesopelagic but can be found all examined ocean basins. This is not well‐correlated oxygen or sulfide concentration. Instead, observe that regions where concentration relatively high compared zinc (dZn) speculate it result enhanced biological uptake response micronutrient balance.

Language: Английский

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Unveiling Method-derived Element Fractionation in Determining Seawater REEs using Chelating Resin and ICP-MS: Enhanced Accuracy for Finer-scale Water Mixing

Talanta, Journal Year: 2025, Volume and Issue: 287, P. 127614 - 127614

Published: Jan. 22, 2025

Language: Английский

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

Deep Sea Research Part I Oceanographic Research Papers, Journal Year: 2023, Volume and Issue: 196, P. 104016 - 104016

Published: Feb. 28, 2023

Language: Английский

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Climate change driven effects on transport, fate and biogeochemistry of trace element contaminants in coastal marine ecosystems

Communications Earth & Environment, Journal Year: 2024, Volume and Issue: 5(1)

Published: Oct. 4, 2024

Language: Английский

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GEOTRACES: Ironing Out the Details of the Oceanic Iron Sources?

Oceanography, Journal Year: 2024, Volume and Issue: 37(2)

Published: Jan. 1, 2024

Dissolved iron (dFe) is an essential micronutrient for phytoplankton, with vanishingly low oceanic dissolved concentrations (pico- to nanomoles per kg) known limit growth—and thus influence primary productivity and carbon cycling—over much of the surface ocean. However, because considerable challenges associated contamination-free sample collection accurate analysis such dFe concentrations, first reliable measurements came only in 1980s. Further, by 2003, despite several decades research, there were ~25 full-depth profiles worldwide, dust considered be main source. Since 2008, facilitated extensive field campaign rigorous intercalibration international GEOTRACES program, has been “explosion” availability data, hundreds now available. Concurrently, a paradigm shift view marine Fe cycle where multiple sources contribute, some forms can transported great distances through intermediate deep Here, we showcase datasets across different ocean basins, synthesize our current multi-source cycle, spotlight sediments as important source, look future directions constraining boundary exchange.

Language: Английский

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The “Net” Impact of Hydrothermal Venting on Oceanic Elemental Inventories: Contributions to Plume Geochemistry from the International GEOTRACES Program

Oceanography, Journal Year: 2024, Volume and Issue: 37(2), P. 102 - 115

Published: Jan. 1, 2024

Hydrothermal vents serve as a primary interface between the cold deep ocean and warm oceanic crust. While early research showed that seawater-​rock interactions add to or remove elements from seawater during generation of hydrothermal fluids, consideration these fluid fluxes alone does not relay total impact systems have on geochemistry. In addition, plumes, areas where fluids mix with waters, are host range particle precipitation scavenging reactions further modify gross define “net” inventories. Here, we review major discoveries made by international GEOTRACES program regarding geochemical transformations occurring within plumes. We classify each element into one five categories based its behavior in spectrum spanning mass balance net source plume sinks. Overall, celebrate role has played defining extent dynamics geochemistry, which is crucial lever for determining global impacts.

Language: Английский

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Trace Element (Fe, Co, Ni and Cu) Dynamics Across the Salinity Gradient in Arctic and Antarctic Glacier Fjords

Frontiers in Earth Science, Journal Year: 2021, Volume and Issue: 9

Published: Sept. 27, 2021

Around the Greenlandic and Antarctic coastlines, sediment plumes associated with glaciers are significant sources of lithogenic material to ocean. These contain elevated concentrations a range trace metals, especially in particle bound phases, but it is not clear how these particles affect dissolved (<0.2 µm) metal distributions Here we show, using transects 8 glacier fjords, trends distribution iron, cobalt, nickel copper (dFe, dCo, dNi, dCu). Following rapid dFe loss close outflows, particular showed strong similarities between different fjords. Similar were also observed seasons/years when Nuup Kangerlua (SW Greenland) was revisited spring, mid- late-summer. Dissolved Cu, dCo dNi more variable gradients salinity depending on fjord, season year. The lack consistent for dCu largely reflects less pronounced differences contrasting concentration inflowing shelf waters fresher glacially-modified waters. Particles made only small contributions total dissolvable Cu (dCu constituted 83 ± 28% Cu) Ni (dNi 86 Ni) within plumes. For comparison, lower fraction Fe; 3.5 4.8%. High Fe some inner-fjord environments, up 77 µM Ameralik Greenland), may drive enhanced removal scavenged type elements, such as Co. Further variability have been driven by local bedrock mineralogy, which could explain high (25–29 nM) (6–7 one coastal region west Greenland (Kangaatsiaq). Our results suggest that element fjords influenced factors including: freshwater concentrations, geology, drawdown scavenging primary production, saline inflow, dynamics. Considering apparent seasonality fluxes elements scale proportionately fjord overturning rather than directly discharge flux.

Language: Английский

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Arctic – Atlantic Exchange of the Dissolved Micronutrients Iron, Manganese, Cobalt, Nickel, Copper and Zinc With a Focus on Fram Strait

Global Biogeochemical Cycles, Journal Year: 2022, Volume and Issue: 36(5)

Published: May 1, 2022

Abstract The Arctic Ocean is considered a source of micronutrients to the Nordic Seas and North Atlantic through gateway Fram Strait (FS). However, there paucity trace element data from across gateways, so it remains unclear how exchange shapes micronutrient availability in two ocean basins. In 2015 2016, GEOTRACES cruises sampled Barents Sea Opening (GN04, 2015) FS (GN05, 2016) for dissolved iron (dFe), manganese (dMn), cobalt (dCo), nickel (dNi), copper (dCu) zinc (dZn). Together with most recent synopsis Arctic‐Atlantic volume fluxes, observed distributions suggest that important as consequence Intermediate Deep Water transport. Combining fluxes estimates Davis (GN02, suggests an annual net southward flux 2.7 ± 2.4 Gg·a −1 dFe, 0.3 dCo, 15.0 12.5 dNi 14.2 6.9 dCu toward Ocean. dMn dZn were more balanced, southbound 2.8 4.7 northbound 3.0 7.3 dZn. Our results ongoing changes shelf inputs sea ice dynamics Arctic, especially Siberian regions, affect high latitude

Language: Английский

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Shelf-Basin Connectivity Drives Dissolved Fe and Mn Distributions in the Western Arctic Ocean: A Synoptic View into Polar Trace Metal Cycling

Oceanography, Journal Year: 2024, Volume and Issue: 37(2)

Published: Jan. 1, 2024

There have been many changes over the past few decades in physical environment and ecosystem health of Arctic Ocean, which is a sentinel global warming. Bioactive trace metal data important micronutrients for algae across ocean, such as iron (Fe) manganese (Mn), are key indicators biogeochemical change. However, historically sparse generally confined to ice-free regions. In 2015, three major GEOTRACES expeditions sought resolve distributions Arctic, covering western, eastern, Canadian sectors. The diverse shelves displayed unique controls on Fe Mn cycling due differing chemical, biological, properties. Here, we contrast shallow, reducing Chukchi Shelf western with tidally forced, advective deeper, less productive Barents eastern Arctic. Reductive dissolution resuspension both proved be large sources North Atlantic outflow. isolated intermediate deep waters, one-dimensional scavenging contrasts vertical biological signals Baffin Bay Labrador Sea.

Language: Английский

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