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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  18 May 2020

18 May 2020

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This preprint is currently under review for the journal GMD.

Implementation and assessment of a carbonate system model (Eco3M-CarbOxv1.1) in a highly-dynamic Mediterranean coastal site (Bay of Marseille, France)

Katixa Lajaunie-Salla1, Frédéric Diaz1, Cathy Wimart-Rousseau1, Thibaut Wagener1, Dominique Lefèvre1, Christophe Yohia2, Irène Xueref-Remy3, Brian Nathan3, Alexandre Armengaud4, and Christel Pinazo1 Katixa Lajaunie-Salla et al.
  • 1Aix Marseille Univ., Université de Toulon, CNRS, IRD, MIO, UM 110, 13288, Marseille, France
  • 2Aix Marseille Univ., CNRS, IRD, OSU Institut Pythéas, 13288, Marseille, France
  • 3Aix Marseille Univ., Université d’Avignon, CNRS, IRD, IMBE, Marseille, France
  • 4AtmoSud: Observatoire de la qualité de l’air en région Sud Provence Alpes Côte d’Azur, le Noilly Paradis, 146 Rue Paradis, 13294 Marseille, Cedex 06, France

Abstract. The Bay of Marseille (BoM, France) is impacted by the urbanized and industrialized Aix-Marseille Metropolis, which is subject to significant increases in anthropogenic emissions of CO2. A carbonate chemistry balance module has been implemented into a biogeochemical model of the planktonic food web. The resulting model, named Eco3M-CarbOx includes 22 states variables that are dispatched into 5 compartments: phytoplankton, heterotrophic bacteria, detritus, dissolved organic and inorganic matter. The model suggests that the variability of the dissolved inorganic carbon system is mainly driven by the seawater temperature dynamics. A seasonal trend is identified by the model and it shows that, during the mixed water column period, the BoM is a sink for atmospheric CO2 and a net autotroph ecosystem, while during stratified water column period, the BoM is a source of CO2 to the atmosphere and a net heterotroph ecosystem. External forcings have an important impact on the carbonate equilibrium. Wind events change seawater temperature quickly, as during upwelling, for which the BoM waters change within a few days from a source of CO2 to the atmosphere to a sink into the ocean. Moreover, the higher the wind speed is, the higher the air-sea CO2 gas exchange fluxes are. The river intrusions with nitrate and alkalinity supplies lead to a decrease in the pCO2 value, favoring the conditions of a sink of atmospheric CO2 into the BoM. The nearby highly urbanized environment of the Aix-Marseille metropolis produces strong atmospheric values of CO2, also favoring the conditions of a sink of atmospheric CO2 into the waters of the BoM.

Katixa Lajaunie-Salla et al.

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Katixa Lajaunie-Salla et al.

Katixa Lajaunie-Salla et al.


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