| Autor: |
Ulses, Caroline, Estournel, Claude, Marsaleix, Patrick, Soetaert, Karline, Fourrier, Marine, Coppola, Laurent, Lefèvre, Dominique, Touratier, Franck, Goyet, Catherine, Guglielmi, Véronique, Kessouri, Fayçal, Testor, Pierre, Durrieu de Madron, Xavier |
| Předmět: |
|
| Zdroj: |
Biogeosciences; 2023, Vol. 20 Issue 22, p4683-4710, 28p |
| Abstrakt: |
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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
