Temporal variability of the carbonate system and air-sea CO 2 exchanges in a Mediterranean human-impacted coastal site
Autor: | Frédéric Diaz, Nicole Garcia, Irène Xueref-Remy, Christel Pinazo, Pierre Marrec, Thibaut Wagener, Pierre-Eric Blanc, Alexandre Armengaud, Fabrice Garcia, Dominique Lefèvre, Patrick Raimbault, Katixa Lajaunie-Salla, Véronique Lagadec, Christophe Yohia, Cathy Wimart-Rousseau, Michel Lafont |
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Přispěvatelé: | Institut méditerranéen d'océanologie (MIO), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), Institut Pythéas (OSU PYTHEAS), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Centre National de la Recherche Scientifique (CNRS), Institut méditerranéen de biodiversité et d'écologie marine et continentale (IMBE), Avignon Université (AU)-Aix Marseille Université (AMU)-Institut de recherche pour le développement [IRD] : UMR237-Centre National de la Recherche Scientifique (CNRS), Regional Network for Air Quality Monitoring, Atmo-PACA, Centre National de la Recherche Scientifique (CNRS)-Université de Toulon (UTLN)-Aix Marseille Université (AMU)-Institut de Recherche pour le Développement (IRD), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut de Recherche pour le Développement (IRD), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Toulon (UTLN) |
Jazyk: | angličtina |
Rok vydání: | 2020 |
Předmět: |
0106 biological sciences
Mediterranean climate 010504 meteorology & atmospheric sciences Aquatic Science Oceanography Atmospheric sciences 01 natural sciences Sink (geography) chemistry.chemical_compound Mediterranean sea 14. Life underwater Bay of Marseille 0105 earth and related environmental sciences geography geography.geographical_feature_category 010604 marine biology & hydrobiology Coastal biogeochemistry [SDE.ES]Environmental Sciences/Environmental and Society Salinity CO2 fluxes chemistry 13. Climate action North Western Mediterranean Sea Carbonate Environmental science Seawater Carbonate system Surface water Bay |
Zdroj: | Estuarine, Coastal and Shelf Science Estuarine, Coastal and Shelf Science, 2020, 236, pp.106641. ⟨10.1016/j.ecss.2020.106641⟩ Estuarine, Coastal and Shelf Science, Elsevier, 2020, ⟨10.1016/j.ecss.2020.106641⟩ Estuarine, Coastal and Shelf Science, Elsevier, 2020, 236, pp.106641. ⟨10.1016/j.ecss.2020.106641⟩ Estuarine Coastal And Shelf Science (0272-7714) (Elsevier BV), 2020-05, Vol. 236, P. 106641 (13p.) |
ISSN: | 0272-7714 1096-0015 |
DOI: | 10.1016/j.ecss.2020.106641⟩ |
Popis: | International audience; The temporal evolution of the carbonate system and air-sea CO 2 fluxes are investigated for the first time in the Bay of Marseille (BoM-North Western Mediterranean Sea), a coastal system affected by anthropogenic forcing from the Marseille metropolis. This study presents a two-year time-series (between 2016 and 2018) of fortnightly measurements of A T , C T, pH and derived seawater carbonate parameters at the SOLEMIO station. On this land-ocean boundary area, no linear relationship between A T and salinity in surface water is observed due to sporadic intrusions of freshwater coming from the Rhone River. On an annual scale, the BoM acts as a sink of atmospheric CO 2. This result is consistent with previous studies in the Mediterranean Sea. Mean daily air-sea CO 2 fluxes range between −0.8 mmol C.m −2 .d −1 and-2.2 mmol C.m −2 .d −1 during the study period, depending on the atmospheric CO 2 sampling site used for the estimates. This study shows that the pCO 2 in the surface water is predominantly driven by temperature changes, even if partially counterbalanced by biological activity. Therefore, temperature is the main contributor to the air-sea CO 2 exchange variability. Mean daily Net Ecosystem Production (NEP) estimates from C T budget shows an ecosystem in which autotrophic processes are associated with a sink of CO 2. Despite some negative NEP values, the observed air-sea CO 2 fluxes in the BoM are negative, suggesting that thermodynamic processes are the predominant drivers for these fluxes. |
Databáze: | OpenAIRE |
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