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Herrmann Marine, Estourmel C., Adloff F., Diaz F. (2014). Impact of climate change on the Northwestern Mediterranean Sea pelagic planktonic ecosystem and associated carbon cycle. Journal of Geophysical Research : Oceans, 119 (9), 5815-5836. ISSN 2169-9275

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Lien direct chez l'éditeur doi:10.1002/2014JC010016

Titre
Impact of climate change on the Northwestern Mediterranean Sea pelagic planktonic ecosystem and associated carbon cycle
Année de publication2014
Type de documentArticle référencé dans le Web of Science WOS:000343879200014
AuteursHerrmann Marine, Estourmel C., Adloff F., Diaz F.
SourceJournal of Geophysical Research : Oceans, 2014, 119 (9), p. 5815-5836. ISSN 2169-9275
RésuméThe 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 physical-biogeochemical 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.
Plan de classementMilieu marin [036MILMAR] ; Climatologie / Météorologie [032CLIMET]
DescripteursINTERACTION OCEAN ATMOSPHERE ; CLIMAT ; PLANCTON ; ESPECE PELAGIQUE ; FONCTIONNEMENT DE L'ECOSYSTEME ; CYCLE BIOGEOCHIMIQUE ; CARBONE ; CIRCULATION ATMOSPHERIQUE ; CIRCULATION OCEANIQUE ; MODELISATION ; VARIATION SAISONNIERE ; VARIATION INTERANNUELLE ; CHANGEMENT CLIMATIQUE
Descr. géo.MEDITERRANEE
LocalisationFonds IRD [F B010062943]
Identifiant IRDfdi:010062943
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010062943

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