Long-term carbon storage in shelf sea sediments reduced by intensive bottom trawling

Nature Geoscience, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 28, 2024

Abstract Bottom trawling represents the most widespread anthropogenic physical disturbance to seafloor sediments on continental shelves. While trawling-induced changes benthic ecology have been widely recognized, impacts long-term organic carbon storage in marine remains uncertain. Here we combined datasets of sediment and bottom for a heavily trawled region, North Sea, explore their potential mutual dependency. A pattern emerges when comparing surface carbon-to-mud ratio with intensity represented by multi-year averaged swept area ratio. The exhibits systematic response where is larger than 1 yr −1 . Three-dimensional physical–biogeochemical simulation results suggest that observed attributed correlated dynamics mud during transport redeposition trawling. Both gain loss sedimentary may occur weakly areas, whereas net reduction found intensely grounds. Cessation allows restoration stock biomass, but recovery occurs at different timescales. Our point out need management grounds enhance CO 2 sequestration capacity shelf seas.

Language: Английский

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The source and accumulation of anthropogenic carbon in the U.S. East Coast

Science Advances, Journal Year: 2024, Volume and Issue: 10(32)

Published: Aug. 9, 2024

The ocean has absorbed anthropogenic carbon dioxide (C

Language: Английский

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Coastal redox shifts over the past 167 years and preservation of total organic carbon and total nitrogen

Marine Pollution Bulletin, Journal Year: 2025, Volume and Issue: 212, P. 117519 - 117519

Published: Jan. 4, 2025

Language: Английский

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Investigating Human Influence on Offshore Terrestrial Organic Carbon Trends in a High-Energy Delta: The Ayeyarwady Delta, Myanmar

Journal of Marine Science and Engineering, Journal Year: 2025, Volume and Issue: 13(1), P. 163 - 163

Published: Jan. 18, 2025

The continental margin is a major repository for organic carbon; however, anthropogenic alterations to global sediment and particulate terrestrial carbon (TerrOC) fluxes have reduced delivery by rivers offshore burial in recent decades. Despite the absence of mainstem damming, land use change Ayeyarwady Thanlwin River catchments Myanmar has accelerated over last 50 years. As result, deforestation landscape erosion likely altered fluvial Northern Andaman Sea shelf; magnitude preservation geochemical signals associated with development are unknown. Utilizing elemental bulk stable radioisotope analysis, this study investigates spatial temporal trends sources TerrOC concentrations identify potential impacts (<100 years) development. While our results demonstrate an along-shelf trend provenance concentrations, (downcore) not observed. We attribute observation frequent, large-scale seabed resuspension suggest that extensive mixing on inner shelf creates low-pass filter effectively attenuates such signatures. This contrast other large Asian deltas, where human disturbance clearly preserved offshore. predict planned damming will result larger supply may become apparent near future.

Language: Английский

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Sources and fate of particulate organic matter along the river-estuary-coastal ocean continuum: Constraints from amino acid and amino sugar carbon isotopes

Geochimica et Cosmochimica Acta, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 1, 2025

Language: Английский

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A novel framework for river organic carbon retrieval through satellite data and machine learning

ISPRS Journal of Photogrammetry and Remote Sensing, Journal Year: 2025, Volume and Issue: 221, P. 109 - 123

Published: Feb. 7, 2025

Language: Английский

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Characterizing sedimentary organic carbon in a hydrothermal spreading center, the Escanaba Trough

Chemical Geology, Journal Year: 2025, Volume and Issue: unknown, P. 122679 - 122679

Published: Feb. 1, 2025

Language: Английский

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Aotearoa New Zealand’s marine carbon cycle in a changing climate – Current understanding and future directions

New Zealand Journal of Marine and Freshwater Research, Journal Year: 2025, Volume and Issue: unknown, P. 1 - 44

Published: Feb. 13, 2025

The marine system plays a critical role in the global climate cycle, as major control of atmospheric carbon dioxide (CO2). Marine primary production (photosynthesis) and remineralisation organic (respiration, degradation) determine amount CO2 sequestered sediments deep-water environments on century to millennial timescales. stocks fluxes cycle are susceptible change impacts other anthropogenic activities that modify key processes. Oceanographic studies Aotearoa New Zealand's Exclusive Economic Zone (NZ EEZ) Territorial Seas over past decades have provided broad knowledge across complex dynamic seascape, but there remain fundamental gaps limit identification response present future threats. In particular, several areas EEZ been under-sampled currently insufficient data establish baselines variability for cycle. We recommend new observational technologies ocean modelling applications be fully developed utilised enable development robust predictive capability our ocean's human-induced perturbations. Future focus oceanic nature-based solutions accelerate uptake will require improved NZ's EEZ.

Language: Английский

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Accelerated Organic Carbon Burial Rates Reconstructed in Elephant Butte Reservoir, New Mexico During a Megadrought

Water Resources Research, Journal Year: 2025, Volume and Issue: 61(3)

Published: Feb. 28, 2025

Abstract Artificial lakes (reservoirs) accumulate sediment and organic carbon (OC) over time. We investigated sedimentation processes in a dryland reservoir informed OC burial potential preservation. Our study site, Elephant Butte Reservoir on the Rio Grande, New Mexico, USA receives inflows from sediment‐laden, monsoon‐driven flash floods. Using field data, historical survey river flux (water, sediment, OC) we estimated volumes rates within delta, bottom, whole during wet (1980–1988) dry (2007–2017/2019) climate periods. During severe drought (2021–2022), measured suspended concentrations for characteristic (seasonal) phases of hydrograph, monitored delta patterns, observed outflow plume dynamics. Measured (mean = 8,818 mg/l, median 1,769 mg/l) frequently surpassed hyperpycnal threshold (1,000 mg/l), especially floods (maximum 46,718 mg/l). River total content averaged 5.2% ± 12.2%, increasing to 6.3% 10.3% summer. Whole linear 3.1 1.4% (dry)–4.0 4.2% (wet) cm/yr, with higher bottom (5.0 0.3% cm/yr) than (0.8 1.1% deposition, potentially preserving OC. Comparisons suspension deposited indicate partial Estimated is conditions (391 43.6% vs. 82.4 56.4% g C/m 2 yr), suggesting that reservoirs may be efficient sinks these

Language: Английский

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Nutrient accumulation and eutrophication restricted CO2 emissions in the two backwater bays in the Three Gorges Reservoir (TGR), China

Journal of Environmental Sciences, Journal Year: 2025, Volume and Issue: unknown

Published: April 1, 2025

Language: Английский

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