Recent trends in the chemistry of major northern rivers signal widespread Arctic change

Nature Geoscience, Journal Year: 2023, Volume and Issue: 16(9), P. 789 - 796

Published: Aug. 21, 2023

Language: Английский

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Aquatic biomass is a major source to particulate organic matter export in large Arctic rivers

Proceedings of the National Academy of Sciences, Journal Year: 2023, Volume and Issue: 120(12)

Published: March 13, 2023

Arctic rivers provide an integrated signature of the changing landscape and transmit signals change to ocean. Here, we use a decade particulate organic matter (POM) compositional data deconvolute multiple allochthonous autochthonous pan-Arctic watershed-specific sources. Constraints from carbon-to-nitrogen ratios (C:N), δ13C, Δ14C signatures reveal large, hitherto overlooked contribution aquatic biomass. Separation in age is enhanced by splitting soil sources into shallow deep pools (mean ± SD: -228 211 vs. -492 173‰) rather than traditional active layer permafrost (-300 236 -441 215‰) that do not represent permafrost-free regions. We estimate 39 60% (5 95% credible interval) annual POM flux (averaging 4,391 Gg/y carbon 2012 2019) comes The remainder sourced yedoma, soils, petrogenic inputs, fresh terrestrial production. Climate change-induced warming increasing CO2 concentrations may enhance both destabilization river biomass production, fluxes Younger, autochthonous, older soil-derived likely have different destinies (preferential microbial uptake processing significant sediment burial, respectively). A small (~7%) increase with would be equivalent ~30% flux. There clear need better quantify how balance endmember shift ramifications for endmembers this will impact system.

Language: Английский

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Export of organic carbon, nutrients and metals by the mid-sized Pechora River to the Arctic Ocean

Chemical Geology, Journal Year: 2023, Volume and Issue: 632, P. 121524 - 121524

Published: May 5, 2023

Language: Английский

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Projecting Global Mercury Emissions and Deposition Under the Shared Socioeconomic Pathways

Earth s Future, Journal Year: 2024, Volume and Issue: 12(4)

Published: April 1, 2024

Abstract Mercury (Hg) is a naturally occurring element that has been greatly enriched in the environment by human activities like mining and fossil fuel combustion. Despite commonalities some carbon dioxide (CO 2 ) Hg emission sources, implications of long‐range climate scenarios for anthropogenic emissions have yet to be explored. Here, we present comprehensive projections extending year 2300 evaluate impacts on global atmospheric deposition. Projections are based four Shared Socioeconomic Pathways (SSPs) ranging from sustainable reductions resource energy intensity rapid economic growth driven abundant exploitation. There greater than two‐fold difference cumulative between lower‐bound (110 Gg) upper‐bound (235 scenarios. releases land water approximately six times those direct air (600–1,470 Gg). At their peak, reach 2,200–2,600 Mg −1 sometime 2010 (baseline) 2030, depending SSP scenario. Coal combustion largest determinant differences among Decoupling CO sources occurs under low‐to mid‐range scenarios, though contributions artisanal small‐scale gold remain uncertain. Future may lower gaseous elemental (Hg 0 higher divalent II ), resulting fraction locally sourced Projected reemissions previously deposited follow similar temporal trajectory primary emissions, amplifying benefits most stringent mitigation

Language: Английский

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Tracing the source and transport of Hg during pedogenesis in strongly weathered tropical soil using Hg isotopes

Geochimica et Cosmochimica Acta, Journal Year: 2023, Volume and Issue: 361, P. 101 - 112

Published: Oct. 18, 2023

Language: Английский

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The land–ocean Arctic carbon cycle

Nature Reviews Earth & Environment, Journal Year: 2025, Volume and Issue: 6(2), P. 86 - 105

Published: Feb. 1, 2025

Language: Английский

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Cumulative Anthropogenic Impacts of Past and Future Emissions and Releases on the Global Mercury Cycle

Environmental Science & Technology, Journal Year: 2025, Volume and Issue: unknown

Published: April 22, 2025

Humans have intentionally mined and released mercury (Hg) from the Earth's lithosphere over millennia. Here, we synthesize past, present, future anthropogenic Hg emissions releases use a global geochemical box model to characterize accumulation in atmosphere, land, ocean. We project an upper-bound for between 2010 2300 (Shared Socioeconomic Pathway (SSP)5-8.5; 1.7 Tg) that surpasses historical total past half millennium (1.5 Tg). In contrast, lower-bound (SSP1-2.6; 0.7 is substantially smaller than total. Observational constraints on modeling suggest most land water prior remains sequestered at contaminated sites. Substantial oceanic enrichment by (270% ca. 2010) has been driven mainly atmospheric emissions. Cumulative are projected be approximately six-times greater primary atmosphere. This legacy waste pools unlikely impact pollution ocean unless it mobilized climate change. Modeling results 2100 concentrations may similar present levels if society follows SSP5-8.5. Declines surface (-19%) atmosphere (-45%) expected under SSP1-2.6, emphasizing benefits of reductions releases.

Language: Английский

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The Multi-Compartment Hg Modeling and Analysis Project (MCHgMAP): mercury modeling to support international environmental policy

Geoscientific model development, Journal Year: 2025, Volume and Issue: 18(9), P. 2747 - 2860

Published: May 16, 2025

Abstract. The Multi-Compartment Hg (mercury) Modeling and Analysis Project (MCHgMAP) is an international multimodel research initiative intended to simulate analyze the geospatial distributions temporal trends of environmental inform effectiveness evaluations two multilateral agreements (MEAs): Minamata Convention on Mercury (MC) Long-Range Transboundary Air Pollution (LRTAP). This MCHgMAP overview paper presents its science objectives, background, rationale; experimental design (multimodel ensemble (MME) architecture, inputs evaluation data, simulations, reporting framework); methodologies for analysis simulated levels. primary goals project are facilitate detection attribution recent (observed) future (projected) spatial patterns global levels identification key knowledge gaps in modeling improve cycles MEAs. current advances challenges models, emission inventories, observational data examined, optimized introduced address policy questions A common set emissions, conditions, observation datasets proposed (where possible) enhance MME comparability. novel harmonized simulation approach between atmospheric, land, oceanic, multimedia models account short- long-term changes secondary exchanges achieve mechanistic consistency across matrices. comprehensive model experiments prioritized ensure systematic participation a variety from scientific community.

Language: Английский

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Climate change dynamics and mercury temporal trends in Northeast Arctic cod (Gadus morhua) from the Barents Sea ecosystem

Environmental Pollution, Journal Year: 2023, Volume and Issue: 338, P. 122706 - 122706

Published: Oct. 9, 2023

The Northeast Arctic cod (Gadus morhua) is the world's northernmost stock of Atlantic and considerable ecological economic importance. are widely distributed in Barents Sea, an environment that supports a high degree ecosystem resiliency food web complexity. Here using 121 years ocean temperature data (1900-2020), 41 sea ice extent information (1979-2020) 27 total mercury (Hg) fillet concentration (1994-2021, n = 1999, ≥71% Methyl Hg, 20) from Sea ecosystem, we evaluate effects climate change dynamics on Hg temporal trends cod. We observed low consistently stable, concentrations (yearly, least-square means range 0.022-0.037 mg/kg wet wt.) length-normalized fish, with slight decline most recent sampling periods despite significant increase temperature, sharp regional extent. Overall, our suggest amplification "Atlantification," other perturbations along rapidly declining over last ∼30 did not translate into major increases or decreases bioaccumulation Our findings consistent similar long-term, assessments inhabiting Oslofjord, Norway, investigations empirical for marine apex predators. This demonstrates highly context specific, some species may be as sensitive to current change-contaminant interactions currently thought. Fish bioaccumulation-climate relationships complex uniform, predators can vary considerably within among species, geographically. regimes biota nuanced likely driven by suite factors such local diets, sources bioenergetics, toxicokinetic processing, growth metabolic rates individuals taxa, inputs anthropogenic activities at varying spatiotemporal scales. Collectively, these have important policy implications global security, Minamata Convention Mercury, several relevant UN Sustainable Development Goals.

Language: Английский

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Reviews and syntheses: Abrupt ocean biogeochemical change under human-made climatic forcing – warming, acidification, and deoxygenation

Published: Oct. 10, 2023

Abstract. Abrupt changes in ocean biogeochemical variables occur as a result of human-induced climate forcing well those which are more gradual and over longer timescales. These abrupt have not yet been identified quantified to the same extent ones. We review synthesise biogeochemistry under climatic forcing. specifically address carbon oxygen cycles because related processes acidification deoxygenation provide important ecosystem hazards. Since depend also on physical environment, we describe relevant warming, circulation, sea ice. include an overview reversibility or irreversibility marine changes. Important implications for ecosystems discussed. conclude that there is evidence increasing occurrence consequence rising greenhouse gas emissions.

Language: Английский

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