Climate change and terrigenous inputs decrease the efficiency of the future Arctic Ocean’s biological carbon pump

Nature Climate Change, Journal Year: 2025, Volume and Issue: 15(2), P. 171 - 179

Published: Jan. 6, 2025

Abstract The Arctic experiences climate changes that are among the fastest in world and affect all Earth system components. Despite expected increase terrigenous inputs to Ocean, their impacts on biogeochemical cycles currently largely neglected IPCC-like models. Here we used a state-of-the-art high-resolution ocean biogeochemistry model includes carbon nutrient from rivers coastal erosion produce twenty-first-century pan-Arctic projections. Surprisingly, even with an anticipated rise primary production across wide range of emission scenarios, our findings indicate change will lead counterintuitive 40% reduction efficiency Arctic’s biological pump by 2100, which contribute 10%. Terrigenous also drive intense CO 2 outgassing, reducing Ocean’s sink at least 10% (33 TgC yr −1 ). These unexpected reinforced feedback, mostly due accelerated remineralization rates, lower capacity for sequestering carbon.

Language: Английский

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Severe 21st-century ocean acidification in Antarctic Marine Protected Areas

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Jan. 4, 2024

Antarctic coastal waters are home to several established or proposed Marine Protected Areas (MPAs) supporting exceptional biodiversity. Despite being threatened by anthropogenic climate change, uncertainties remain surrounding the future ocean acidification (OA) of these waters. Here we present 21st-century projections OA in MPAs under four emission scenarios using a high-resolution ocean-sea ice-biogeochemistry model with realistic ice-shelf geometry. By 2100, project pH declines up 0.36 (total scale) for top 200 m. Vigorous vertical mixing carbon produces severe throughout water column and existing MPAs. Consequently, end-of-century aragonite undersaturation is ubiquitous three highest scenarios. Given cumulative threat marine ecosystems environmental change activities such as fishing, our findings call strong emission-mitigation efforts further management strategies reduce pressures on ecosystems, continuation expansion

Language: Английский

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Twenty‐First‐Century Environmental Change Decreases Habitat Overlap of Antarctic Toothfish (Dissostichus mawsoni) and Its Prey

Global Change Biology, Journal Year: 2025, Volume and Issue: 31(2)

Published: Feb. 1, 2025

ABSTRACT Antarctic toothfish are a commercially exploited upper‐level predator in the Southern Ocean. As many of its prey, ectothermic, water‐breathing is specifically adapted to temperature and oxygen conditions present high‐latitude Additionally, life cycle depends on sea‐ice dynamics transport individuals by currents between regions with different prey. To assess impact 21st‐century climate change potential interactions we here employ extended aerobic growth index (AGI), which quantifies effect ocean levels habitat viability individual species. We quantify changes predator–prey viable overlap as obtained AGI. environmental data, use future projections for four emission scenarios from model FESOM‐REcoM, designed applications near continental shelf. For two highest‐emission scenarios, find that warming deoxygenation response cause subsurface decline up 40% important prey species, such silverfish icefish. Acknowledging regional differences, our results demonstrate alone can significantly perturb Our findings highlight need better quantitative understanding impacts species constrain ecosystem change.

Language: Английский

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Antarctic benthic ecological change

Nature Reviews Earth & Environment, Journal Year: 2024, Volume and Issue: 5(9), P. 645 - 664

Published: Sept. 3, 2024

Language: Английский

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Utilization of high CO2 level as a treatment for green spot disease-like disease in the cultivated seaweed Pyropia haitanensis

Fisheries Science, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 9, 2025

Language: Английский

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Impacts of ocean acidification on the palatability of two Antarctic macroalgae and the consumption of a grazer

Antarctic Science, Journal Year: 2025, Volume and Issue: unknown, P. 1 - 10

Published: Feb. 20, 2025

Abstract Increases in atmospheric CO 2 have led to more entering the world’s oceans, decreasing pH a process called ’ocean acidification’. Low has been linked impacts on macroalgal growth and stress, which can alter palatability herbivores. Two common ecologically important species from western Antarctic Peninsula, unpalatable Desmarestia menziesii palatable Palmaria decipiens , were maintained under three treatments: ambient (pH 8.1), near future (7.7) distant (7.3) for 52 days 18 days, respectively. Discs of P. or artificial foods containing extracts D. each treatment presented amphipod Gondogeneia antarctica feeding choice experiments. Additionally, G. exposed different treatments 55 used assay with untreated . For eaten significantly by weight than other treatments. Similarly, discs 7.7 those 7.3 treatment. There was no significant difference consumption treated These results suggest that ocean acidification may decrease these macroalgae consumers but not

Language: Английский

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Climate Change, Sustainable Food Systems, and Community-Based Adaptation: Resilience Strategies in the Global South

Published: Jan. 1, 2025

Language: Английский

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Pteropods as early‐warning indicators of ocean acidification

Limnology and Oceanography, Journal Year: 2025, Volume and Issue: unknown

Published: May 1, 2025

Abstract Aragonite undersaturation ( 1) events are projected to rapidly increase in frequency and duration the Antarctic Weddell Sea by 2050. Thecosome pteropods (pelagic snails) bioindicators of ocean acidification (OA) because their aragonite shell dissolves easily at low saturation states. Here, we describe dissolution state pteropod Limacina helicina antarctica relation water column southern during austral summer 2018 as benchmark for future monitoring ongoing OA. depth profiles sampling sites were consistently close or range threshold levels 1.1–1.3) dissolution. Pteropods contributed up 69% total mesozooplankton biomass, distribution correlated positively with chlorophyll a concentration. When analyzed scanning electron microscopy, 78% investigated shells exhibited dissolution, 50–69% showed more severe Type II exceeding current projections Southern Ocean. But importantly, our study, only two specimens had most III Dissolution often co‐occurred occurred scratch marks unclear origin supporting notions that an intact periostracum protects from Where absence scratches evidence breaches, microscale/nanoscale breaches may have been important pathway commencement recent findings reduction organic content caused /low pH. The provide here allows application early‐warning indicators presumably progressing OA Sea.

Language: Английский

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Increased light intensity enhances photosynthesis and biochemical components of red macroalga of commercial importance, Kappaphycus alvarezii, in response to ocean acidification

Plant Physiology and Biochemistry, Journal Year: 2024, Volume and Issue: 208, P. 108465 - 108465

Published: Feb. 24, 2024

Language: Английский

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Environmental behavior and toxic effects of micro(nano)plastics and engineered nanoparticles on marine organisms under ocean acidification: a review

Environmental Research, Journal Year: 2024, Volume and Issue: unknown, P. 120267 - 120267

Published: Oct. 1, 2024

Language: Английский

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