The hidden acceleration pump uncovers the role of shellfish in oceanic carbon sequestration

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 951, P. 175699 - 175699

Published: Aug. 23, 2024

Language: Английский

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Sedimentary Nitrate Respiration Potentially Offsets the Climatic Benefits From CO₂ Uptake by Marginal Seas

Geophysical Research Letters, Journal Year: 2025, Volume and Issue: 52(6)

Published: March 22, 2025

Abstract Sediment nitrate respiration eliminates reactive nitrogen (Nr) and consumes organic carbon (OC) accompanying by CO 2 N O production to partially neutralize the climate benefit of sedimentary burial. The quantitative linkage between stoichiometry greenhouse potential this syndepositional process, particularly at a marginal sea scale, remains unexplored. Here we show that temperature matter co‐regulate sediment associated in China's seas. By establishing empirical equations, access 2.8 ± 0.4 Tg Nr (∼26.5% riverine input) is annually respired via degrading 2.2 0.2 OC (∼12.5% deposited) produce 15.0 3.5 Gg O‐N, which may counter‐balance 15.1 8.1% air‐sea influx. This link anthropogenic input removal sequestration reveals potentially reduces climatic benefits

Language: Английский

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Linking interannual variability of turbidity fronts in the Eastern China Seas to local processes and ocean warming

Frontiers in Marine Science, Journal Year: 2025, Volume and Issue: 12

Published: Feb. 3, 2025

The turbidity front is susceptible to rapid changes in ocean hydrodynamics. Understanding its variability crucial for elucidating material transport on continental shelves light of evolving land-ocean interactions. However, the long-term frontal and controlling mechanism over shelf sea scale still need further study. Using a decade satellite observations, this study assesses interannual fronts Eastern China Seas their responses local processes warming. A gradient-based detection algorithm probability are used identify geographical locations at scale, respectively. Regional heterogeneities variations mechanisms activity observed. Specifically, significant (p<0.05) strongest correlations show that wind wave, horizontal temperature gradient, mixed layer depth identified as most important drivers Bohai, Yellow, East Seas, El Niño-Southern Oscillation influences anomalies through delayed wind-response (>=4 months). Notably, recent increase (+0.07%/year) offshore areas Yellow primarily attributed an intensified (density) gradient (+0.0005 °C/km/year) resulting from As warming continues, terrigenous materials expected increase, potentially enhancing primary productivity carbon sequestration, altering ecosystem function fisheries.

Language: Английский

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The impact of long-lived cycle mesoscale eddies on air-sea CO2 flux in the South Atlantic: focus on the full life cycle of the eddy

Environmental Research Letters, Journal Year: 2025, Volume and Issue: 20(3), P. 034033 - 034033

Published: Feb. 13, 2025

Abstract Mesoscale eddies are prevalent in the global oceans and known to influence oceanic atmospheric conditions. This study aims assess how impact of mesoscale on air–sea CO 2 fluxes varies throughout their lifecycle. We compared six machine learning models, including light gradient boosting machine, support vector XGBoost construct an FCO evaluation model. Among these, model performed best, with validation yielding coefficient determination ( R ) value 0.9046 a root mean square error 1.4165 mmol m –2 d –1 , successfully assessing South Atlantic. Analysing lifespan exceeding 300 during period from 1995 2020, we identified two distinct peaks life cycle: first peak occurs approximately between second fifth deciles cycle, which have broader range but weaker influence; emerges seventh ninth deciles, exhibiting narrower significantly stronger influence. These findings provide crucial quantitative evidence for understanding marine carbon sequestration mechanism reveal complexity dynamic nature eddies’ fluxes.

Language: Английский

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Reconstruction of Global Ocean Surface pCO₂ and Air‐Sea CO₂ Flux: Based on Multigrained Cascade Forest Model

Journal of Geophysical Research Oceans, Journal Year: 2025, Volume and Issue: 130(2)

Published: Feb. 1, 2025

Abstract Quantifying the role of air‐sea CO 2 exchange is essential for accurately estimating global carbon balance, which dependent on spatial and temporal resolution ocean surface dioxide partial pressure (). When dealing with as a vast complex system, most existing studies tend to partition into small‐scale regions. To account interactions environmental variables across multiple regions, we used machine learning algorithms holistically reconstruct 20‐year map at high 4 × km based products from Moderate Resolution Imaging Spectroradiometer, reanalysis data, Surface Ocean Atlas. Three methods were compared, multigrained cascade forest (gcForest) demonstrating highest accuracy in reconstruction (r 0.92, root mean square error 13.46, absolute 7.34 μatm). The has shown steady increase an average annual growth rate 1.95 ± 0.05 μatm yr −1 , controlled mainly by sea temperature chlorophyll concentration. This study covers area approximately 335 encompassing over 95% sink area. During 20 years, daily flux decreased 0.44 mmol m −2 d while proportion remained constant, indicating ocean's uptake capacity per unit been increasing.

Language: Английский

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Research on Atlantic surface pCO2 reconstruction based on machine learning

Ecological Informatics, Journal Year: 2025, Volume and Issue: unknown, P. 103094 - 103094

Published: March 1, 2025

Language: Английский

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Surface CO2 partial pressure and air–sea CO2 flux on the China side of the South Yellow Sea based on multiple-year underway measurements during 2005–2011 and comparison with results for 2011–2018

Progress In Oceanography, Journal Year: 2025, Volume and Issue: 234, P. 103466 - 103466

Published: March 16, 2025

Language: Английский

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Decreased Air‐Sea CO2 ${\mathbf{\text{CO}}}_{\mathbf{2}}$ Flux During the Persistent Marine Heatwaves in the Yellow Sea and East China Sea

Journal of Geophysical Research Oceans, Journal Year: 2025, Volume and Issue: 130(4)

Published: April 1, 2025

Abstract Marine heatwaves (MHWs) exert a significant influence on marine ecosystem, especially in marginal seas where carbonate processes are intricately linked to temperature variations. However, how MHWs affect the seas, such as Yellow Sea (YS) and East China (ECS), remains unclear. Here, we employ physical‐biogeochemical model simulate aiming systematically quantify impacts of persistent (PMHWs) air‐sea flux () anomaly YS ECS. Results reveal that due reduced wind speed elevated during PMHWs, ocean reservoir experiences dramatic decrease. In summer when releases CO 2 atmosphere, suppressed outgassing induced by decreased counteracts resulted from high temperature. winter, both factors suppress absorption atmosphere ocean. addition, spatial pattern is dominated partial pressure surface water (). While thermal effects have contribution 61% 33% ECS positive anomaly, non‐thermal primarily driven alkalinity play more vital role amplifying (61% 90% respectively). Furthermore, horizontal advection emerges dominant process modulating variations ECS, with 72 ± 17% 75 60% respectively. These findings underscore importance understanding physical mechanisms behind PMHWs analyzing its ecological within coastal environments.

Language: Английский

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Marine Heatwave and Terrestrial Drought Reduced CO2 Uptake in the East China Sea in 2022

Remote Sensing, Journal Year: 2024, Volume and Issue: 16(5), P. 849 - 849

Published: Feb. 29, 2024

Against the background of climate warming, marine heatwaves (MHWs) and terrestrial drought events have become increasingly frequent in recent decades. However, combined effects MHWs on CO2 uptake marginal seas are still unclear. The East China Sea (ECS) experienced an intense long-lasting MHW accompanied by extreme Changjiang basin summer 2022. In this study, we employed multi-source satellite remote sensing products to reveal patterns, magnitude, potential drivers flux changes ECS resulting from compounding extremes. reduced 17.0% (1.06 Tg C) latter half 2022 River plume region shifted a sink source (releasing 0.11 July-September. majority ECS, positive sea surface temperature (SST) anomaly during diminished solubility seawater, thereby reducing uptake. Moreover, reduction nutrient input associated with drought, which is unfavorable phytoplankton growth, further capacity Meanwhile, doubled for offshore waters continental shelf July-September 2022, indicating complexity heterogeneity impacts climatic seas. This study great significance improving estimation results fluxes understanding sea–air exchanges against global change.

Language: Английский

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Significant CO2 emission in the shallow inshore waters of the southeastern Yellow Sea in 2020

Marine Pollution Bulletin, Journal Year: 2024, Volume and Issue: 201, P. 116262 - 116262

Published: March 20, 2024

Language: Английский

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