Seasonal dynamics and annual budget of dissolved inorganic carbon in the northwestern Mediterranean deep-convection region
| Type | : | ACL |
|---|---|---|
| Nature | : | Production scientifique |
| Au bénéfice du Laboratoire | : | Oui |
| Statut de publication | : | Publié |
| Année de publication | : | 2023 |
| Auteurs (13) | : | ULSES Caroline ESTOURNEL Claude MARSALEIX Patrick SOETAERT K FOURRIER Marine COPPOLA Laurent LEFÈVRE Dominique TOURATIER F GOYET Catherine GUGLIELMI V KESSOURI Fayçal TESTOR Pierre DURRIEU DE MADRON Xavier |
| Revue scientifique | : | Biogeosciences |
| Volume | : | 20 |
| Fascicule | : | 22 |
| Pages | : | 4683-4710 |
| DOI | : | 10.5194/bg-20-4683-2023 |
| URL | : | https://bg.copernicus.org/articles/20/4683/2023/ |
| Abstract | : | Deep convection plays a key role in the circulation, thermodynamics, and biogeochemical cycles in the Mediterranean Sea, which is considered to be a hotspot of biodiversity and climate change. In the framework of the DEWEX (Dense Water Experiment) project, the seasonal and annual budgets of dissolved inorganic carbon in the deep-convection area of the northwestern Mediterranean Sea are investigated over the period September 2012-September 2013 using a 3D coupled physical-biogeochemical-chemical modeling approach. At the annual scale, we estimate that the northwestern Mediterranean Sea's deep-convection region was a moderate sink of 0.5 mol C m - 2 yr - 1 of CO 2 for the atmosphere. The model results show the reduction of oceanic CO 2 uptake during deep convection and its increase during the abrupt spring phytoplankton bloom following the deep-convection events. We highlight the major roles in the annual dissolved inorganic carbon budget of both the biogeochemical and physical fluxes, which amount to - 3.7 and 3.3 mol C m - 2 yr - 1 , respectively, and are 1 order of magnitude higher than the air-sea CO 2 flux. The upper layer (from the surface to 150 m depth) of the northwestern deep-convection region gained dissolved inorganic carbon through vertical physical transport and, to a lesser extent, oceanic CO 2 uptake, and it lost dissolved inorganic carbon through lateral transport and biogeochemical fluxes. The region, covering 2.5 % of the Mediterranean, acted as a source of dissolved inorganic carbon for the surface and intermediate water masses of the Balearic Sea and southwestern Mediterranean Sea and could represent up to 22 % and 11 %, respectively, of the CO 2 exchanges with the Atlantic Ocean at the Strait of Gibraltar. |
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| Commentaire | : | - |
| Tags | : | - |
| Fichier attaché | : | - |
| Citation | : |
Ulses C, Estournel C, Marsaleix P, Soetaert K, Fourrier M, Coppola L, Lefèvre D, Touratier F, Goyet C, Guglielmi V, Kessouri F, Testor P, Durrieu de Madron X (2023) Seasonal dynamics and annual budget of dissolved inorganic carbon in the northwestern Mediterranean deep-convection region. Biogeosciences 20: 4683-4710 | doi: 10.5194/bg-20-4683-2023
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