Preprints
https://doi.org/10.5194/bg-2022-219
https://doi.org/10.5194/bg-2022-219
 
15 Nov 2022
15 Nov 2022
Status: this preprint is currently under review for the journal BG.

Seasonal dynamics and annual budget of dissolved inorganic carbon in the northwestern Mediterranean deep convection region

Caroline Ulses1, Claude Estournel1, Patrick Marsaleix1, Karline Soetaert2, Marine Fourrier3, Laurent Coppola3,4, Dominique Lefèvre5, Franck Touratier6, Catherine Goyet6, Véronique Guglielmi6, Fayçal Kessouri7, Pierre Testor8, and Xavier Durrieu de Madron9 Caroline Ulses et al.
  • 1Laboratoire d’Etudes en Géophysique et Océanographie Spatiales (LEGOS), Université de Toulouse, CNES, CNRS, IRD, UPS, Toulouse, France
  • 2Department of Estuarine and Delta Systems, NIOZ Royal Netherlands Institute for Sea Research, 4400 AC Yerseke, The Netherlands
  • 3Sorbonne Université, CNRS, Laboratoire d’Océanographie de Villefranche (LOV), Villefranche-sur-Mer, France
  • 4Sorbonne Université, CNRS, OSU STAMAR, Paris, France
  • 5Aix-Marseille Université, Mediterranean Institute of Oceanography (MIO), 13288 Marseille Cedex 9, France
  • 6IMAGES_ESPACE-DEV, Université de Perpignan Via Domitia, 52 Avenue Paul Alduy, 66860 Perpignan, France
  • 7Southern California Coastal Water Research Project, Costa Mesa, CA, USA
  • 8CNRS-Sorbonne Universités (UPMC Univ. Pierre et Marie Curie, Paris 06)-CNRS-IRD-MNHN, UMR 7159, Laboratoire d’Océanographie et de Climatologie (LOCEAN), Institut Pierre Simon Laplace (IPSL), Observatoire Ecce Terra, Paris, France
  • 9CEFREM, CNRS-Université de Perpignan, 52 avenue Paul Alduy, 66860, Perpignan, France

Abstract. Deep convection plays a key role in the circulation, thermodynamics and biogeochemical cycles in the Mediterranean Sea, considered as a hotspot of biodiversity and climate change. In the framework of the DEWEX (Dense Water Experiment) project, the seasonal cycle and annual budget 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 3-dimensional coupled physical-biogeochemical-chemical modeling approach. We estimate that the northwestern Mediterranean Sea deep convection region was a moderate sink of CO2 for the atmosphere over the study period. The model results show the reduction of CO2 uptake during deep convection, and its increase during the abrupt spring phytoplankton bloom following the deep convection events. We highlight the dominant role of both biological and physical flows in the annual dissolved inorganic carbon budget. The upper layer of the northwestern deep convection region gained dissolved inorganic carbon through vertical physical supplies and, to a lesser extent, air-sea flux, and lost dissolved inorganic carbon through lateral transport and biological 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 western and southern Western Mediterranean Sea and could contribute up to 10 and 20 % to the CO2 exchanges with the Eastern Mediterranean Sea and the Atlantic Ocean.

Caroline Ulses et al.

Status: open (until 08 Jan 2023)

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Caroline Ulses et al.

Caroline Ulses et al.

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Short summary
Deep convection plays a key role in the circulation, thermodynamics and biogeochemical cycles in the Mediterranean Sea, considered as a hotspot of biodiversity and climate change. In this study, we investigate the seasonal cycle and annual budget of dissolved inorganic carbon in the deep convection area of the northwestern Mediterranean Sea.
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