Functioning of the planktonic ecosystem on the Gulf of Lions shelf (NW Mediterranean) during spring and its impact on the carbon deposition: a field data and 3-D modelling combined approach

Auger, Pierre-Amaël; Diaz, Frédéric; Ulses, Caroline; Estournel, Claude; Neveux, Jacques; Joux, Fabien; Pujo‐Pay, Mireille; Naudin, Jean-Jacques

doi:10.5194/bg-8-3231-2011

Cited by 49 publications

(78 citation statements)

References 123 publications

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“…The Eco3M‐S model is a multinutrient and multiplankton functional type model that simulates the dynamics of the biogeochemical decoupled cycles of several biogenic elements (carbon, nitrogen, phosphorus, and silicon), and of non‐Redfieldian plankton groups. The model structure used in this study has been previously described in Ulses et al (), Auger et al (), and Herrmann et al (). Most parameter values are based on the study of Ulses et al (), but a new calibration was carried out for some parameters using several observational data sets (Kessouri et al, ).…”

Section: Methodsmentioning

confidence: 99%

Vertical Mixing Effects on Phytoplankton Dynamics and Organic Carbon Export in the Western Mediterranean Sea

et al. 2018

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A 3‐D high‐resolution coupled hydrodynamic‐biogeochemical model of the western Mediterranean was used to study phytoplankton dynamics and organic carbon export in three regions with contrasting vertical regimes, ranging from deep convection to a shallow mixed layer. One month after the initial increase in surface chlorophyll (caused by the erosion of the deep chlorophyll maximum), the autumnal bloom was triggered in all three regions by the upward flux of nutrients resulting from mixed layer deepening. In contrast, at the end of winter, the end of turbulent mixing favored the onset of the spring bloom in the deep convection region. Low grazing pressure allowed rapid phytoplankton growth during the bloom. Primary production in the shallow mixed layer region, the Algerian subbasin, was characterized by a long period (4 months) of sustained phytoplankton development, unlike the deep convection region where primary production was inhibited during 2 months in winter. Despite seasonal variations, annual primary production in all three regions is similar. In the deep convection region, total organic carbon export below the photic layer (150 m) and transfer to deep waters (800 m) was 5 and 8 times, respectively, higher than in the Algerian subbasin. Although some of the exported material will be injected back into the surface layer during the next convection event, lateral transport, and strong interannual variability of MLD in this region suggest that a significant amount of exported material is effectively sequestrated.

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Section: Methodsmentioning

confidence: 99%

Vertical Mixing Effects on Phytoplankton Dynamics and Organic Carbon Export in the Western Mediterranean Sea

et al. 2018

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“…The model structure used in this study is based on the same pelagic plankton ecosystem model as the one fully described and used by Herrmann [2007, chap. 5] and Auger et al [2011]. There are six main groups (zooplankton, phytoplankton, heterotrophic bacteria, particulate organic matter (POM, small (S) and large (L)), dissolved organic matter (DOM) and nutrients (or dissolved inorganic matter, DIM)), and 33 state variables.…”

Section: The Biogeochemical Modelmentioning

confidence: 99%

Impact of atmospheric and oceanic interannual variability on the Northwestern Mediterranean Sea pelagic planktonic ecosystem and associated carbon cycle

Herrmann

Diaz

Estournel

et al. 2013

J. Geophys. Res. Oceans

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[1] The Northwestern Mediterranean Sea (NWMS) is one of the most productive areas of the Mediterranean Sea. The NWMS pelagic planktonic ecosystem is strongly influenced by hydrodynamics, in particular winter deep convection. Here, we investigate the response of this ecosystem and associated carbon cycle to oceanic and atmospheric winter conditions interannual variability. For that we developed a tridimensional coupled physicalbiogeochemical model, ran annual simulations forced by XXth climate conditions and performed statistical and budget analysis.Our coupled model reproduces correctly the seasonal evolution of the NWMS pelagic planktonic ecosystem. It however overestimates the contribution of nanophytoplankton to the total phytoplanktonic biomass and GPP, underestimates the bacteria biomass and represents the spring bloom with 1 month delay. Our results confirm that the control of phytoplanktonic development and bacteria growth by the phosphorus availability is a marked specificity of the NWMS, that is, temporally reduced by deep convection. They confirm the relevance of the Behrenfeld (2010) hypothesis in explaining the bloom dynamics. The variability of the winter atmospheric conditions induces differences of vertical mixing and water temperature that propagate into the whole NWMS ecosystem through a chain of relationships. The high frequency filtering associated with averaging diagnostics explains that this variability seems weak at the NWMS scale. However for most of the variables and processes, differences induced by the winter atmospheric variability are significant at the annual scale. Net metabolism and deep carbon export are systematically positive and show larger variabilities related, respectively, to the water temperature and convection intensity.Citation: Herrmann, M., F. Diaz, C. Estournel, P. Marsaleix, and C. Ulses (2013), Impact of atmospheric and oceanic interannual variability on the Northwestern Mediterranean Sea pelagic planktonic ecosystem and associated carbon cycle,

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“…As a result, the coupled model that is used in the present study is an interesting compromise relative to more complex (in terms of number of biological equations and parameters) models of bacterioplankton growth applied to shelf waters (e.g. Auger et al, 2011;Anderson and Williams, 1998). …”

Section: The Bacterioplankton Production Versus Primary Production Ramentioning

confidence: 99%

Modelling the impact of riverine DON removal by marine bacterioplankton on primary production in the Arctic Ocean

et al. 2015

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Abstract. The planktonic and biogeochemical dynamics of the Arctic shelves exhibit a strong variability in response to Arctic warming. In this study, we employ a biogeochemical model coupled to a pan-Arctic ocean-sea ice model (MITgcm) to elucidate the processes regulating the primary production (PP) of phytoplankton, bacterioplankton (BP), and their interactions. The model explicitly simulates and quantifies the contribution of usable dissolved organic nitrogen (DON) drained by the major circum-Arctic rivers to PP and BP in a scenario of melting sea ice (1998)(1999)(2000)(2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011). Model simulations suggest that, on average between 1998 and 2011, the removal of usable riverine dissolved organic nitrogen (RDON) by bacterioplankton is responsible for a ∼ 26 % increase in the annual BP for the whole Arctic Ocean. With respect to total PP, the model simulates an increase of ∼ 8 % on an annual basis and of ∼ 18 % in summer. Recycled ammonium is responsible for the PP increase. The recycling of RDON by bacterioplankton promotes higher BP and PP, but there is no significant temporal trend in the BP : PP ratio within the ice-free shelves over the 1998-2011 period. This suggests no significant evolution in the balance between autotrophy and heterotrophy in the last decade, with a constant annual flux of RDON into the coastal ocean, although changes in RDON supply and further reduction in sea-ice cover could potentially alter this delicate balance.

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Functioning of the planktonic ecosystem on the Gulf of Lions shelf (NW Mediterranean) during spring and its impact on the carbon deposition: a field data and 3-D modelling combined approach

Cited by 49 publications

References 123 publications

Vertical Mixing Effects on Phytoplankton Dynamics and Organic Carbon Export in the Western Mediterranean Sea

Vertical Mixing Effects on Phytoplankton Dynamics and Organic Carbon Export in the Western Mediterranean Sea

Impact of atmospheric and oceanic interannual variability on the Northwestern Mediterranean Sea pelagic planktonic ecosystem and associated carbon cycle

Modelling the impact of riverine DON removal by marine bacterioplankton on primary production in the Arctic Ocean

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