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Article Dans Une Revue Geophysical Research Letters Année : 2024

Stronger Oceanic CO2 Sink in Eddy-Resolving Simulations of Global Warming

Résumé

Understanding the ocean's capacity to mitigate or amplify human-induced climate change is essential for refining future climate projections, particularly for estimating the remaining carbon budget (Canadell et al., 2021). To date, the ocean absorbs ∼25% of CO2 emissions caused by human activities (Friedlingstein et al., 2022). The ocean's capacity to sequester anthropogenic CO2 makes it a key player in determining the rate at which CO2 accumulates in the atmosphere. Thus an important question is how this oceanic CO2 sink will evolve under continuing CO2 emissions and global warming, because it will influence the pace of climate change. The strength of the oceanic CO2 sink is set by the balance between two mechanisms. The uptake of anthropogenic CO2 by the ocean is primarily a chemical response to the rise in atmospheric CO 2 that forces a growing disequilibrium of the partial pressure of CO2 (pCO2) at the air-sea interface. The carbon-concentration feedback parameter is a metric commonly used to measure how much anthropogenic CO2 is absorbed by the ocean for each additional unit of CO2 (expressed in ppm) added to the atmosphere, assuming the ocean dynamical and thermodynamical state remains unchanged (
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Dates et versions

hal-04454847 , version 1 (13-02-2024)

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Damien Couespel, Marina Lévy, Laurent Bopp. Stronger Oceanic CO2 Sink in Eddy-Resolving Simulations of Global Warming. Geophysical Research Letters, 2024, 51 (4), pp.e2023GL106172. ⟨10.1029/2023GL106172⟩. ⟨hal-04454847⟩
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