%0 Journal Article
%T New insights into the organic carbon export in the Mediterranean Sea from 3-D modeling
%+ Institut méditerranéen d'océanologie (MIO)
%+ University of Southampton
%+ Centre national de recherches météorologiques (CNRM)
%+ Unité de Mécanique (UME)
%+ Laboratoire de Météorologie Dynamique (UMR 8539) (LMD)
%+ Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE)
%+ Modélisation du climat (CLIM)
%A Guyennon, A
%A Baklouti, M
%A Diaz, Frederic
%A Palmiéri, J.
%A Beuvier, J
%A Lebeaupin-Brossier, C
%A Arsouze, T
%A Beranger, K.
%A Dutay, J.-C
%A Moutin, T.
%< avec comité de lecture
%@ 1726-4170
%J Biogeosciences
%I European Geosciences Union
%V 12
%N 23
%P 7025-7046
%8 2015-12-07
%D 2015
%R 10.5194/bg-12-7025-2015
%K mechanistic modelling
%K coupled physical-biogeochemical modelling
%K Mediterranean Sea
%K carbon export
%Z Sciences of the Universe [physics]/Earth Sciences/OceanographyJournal articles
%X The Mediterranean Sea is one of the most oligotrophic regions of the oceans, and nutrients have been shown to limit both phytoplankton and bacterial activities, resulting in a potential major role of dissolved organic carbon (DOC) export in the biological pump. Strong DOC accumulation in surface waters is already well documented, though measurements of DOC stocks and export flux are still sparse and associated with major uncertainties. This study provides the first basin-scale overview and analysis of organic carbon stocks and export fluxes in the MediterraneanSea through a modeling approach based on a coupled model combining a mechanistic biogeochemical model (Eco3M-MED) and a high-resolution (eddy-resolving) hydrodynamic simulation (NEMO-MED12). The model is shown to reproduce the main spatial and seasonal biogeochemical characteristics of the Mediterranean Sea. Model estimations of carbon export are also of the same order of magnitude as estimations from in situ observations, and their respective spatial patterns are mutually consistent. Strong differences between the western and eastern basins are evidenced by the model for organic carbon export. Though less oligotrophic than the eastern basin, the western basin only supports 39 %of organic carbon (particulate and dissolved) export. Another major result is that except for the Alboran Sea, the DOC contribution to organic carbon export is higher than that of particulate organic carbon (POC) throughout the MediterraneanSea, especially in the eastern basin. This paper also investigates the seasonality of DOC and POC exports as well asthe differences in the processes involved in DOC and POC exports in light of intracellular quotas. Finally, according tothe model, strong phosphate limitation of both bacteria and phytoplankton growth is one of the main drivers of DOC accumulation and therefore of export.
%G English
%2 https://hal.science/hal-01345570/document
%2 https://hal.science/hal-01345570/file/bg-12-7025-2015.pdf
%L hal-01345570
%U https://hal.science/hal-01345570
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