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Global warming and acid atmospheric deposition impacts on carbonate dissolution and CO2 fluxes in French karst hydrosystems: evidence from hydrochemical monitoring in recent decades

hal.structure.identifierService National d'Observation sur le KARST [SNO Karst]
hal.structure.identifierInstitut des Sciences de la Terre d'Orléans - UMR7327 [ISTO]
hal.structure.identifierBiogéosystèmes Continentaux - UMR7327
dc.contributor.authorBINET, Stéphane
hal.structure.identifierLaboratoire Ecologie Fonctionnelle et Environnement [LEFE]
hal.structure.identifierService National d'Observation sur le KARST [SNO Karst]
dc.contributor.authorPROBST, J.L.
hal.structure.identifierHydrosciences Montpellier [HSM]
hal.structure.identifierService National d'Observation sur le KARST [SNO Karst]
dc.contributor.authorBATIOT-GUILHE, Christelle
hal.structure.identifierHydrosciences Montpellier [HSM]
hal.structure.identifierService National d'Observation sur le KARST [SNO Karst]
dc.contributor.authorSEIDEL, J.L.
hal.structure.identifierEnvironnement Méditerranéen et Modélisation des Agro-Hydrosystèmes [EMMAH]
hal.structure.identifierService National d'Observation sur le KARST [SNO Karst]
hal.structure.identifierAvignon Université [AU]
dc.contributor.authorEMBLANCH, C.
hal.structure.identifierService National d'Observation sur le KARST [SNO Karst]
dc.contributor.authorPEYRAUBE, Nicolas
IDREF: 157074005
hal.structure.identifierService National d'Observation sur le KARST [SNO Karst]
hal.structure.identifierBureau de Recherches Géologiques et Minières [BRGM]
dc.contributor.authorCHARLIER, Jean-Baptiste
hal.structure.identifierHydrosciences Montpellier [HSM]
hal.structure.identifierService National d'Observation sur le KARST [SNO Karst]
dc.contributor.authorBAKALOWICZ, M.
hal.structure.identifierLaboratoire Ecologie Fonctionnelle et Environnement [LEFE]
hal.structure.identifierService National d'Observation sur le KARST [SNO Karst]
dc.contributor.authorPROBST, Anne
dc.date.accessioned2021-05-14T09:38:04Z
dc.date.available2021-05-14T09:38:04Z
dc.date.issued2020
dc.identifier.issn0016-7037
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/76400
dc.description.abstractEnThe long-term change in surface water chemistry over time in remote areas is usually related to global change, including several processes such as global warming and acid atmospheric pollution. These cumulative factors limit the quantitative interpretation of the global warming effect on surface water acidification in relation to the atmospheric CO2 sink. To quantitatively estimate the impact of global warming on the atmospheric/soil CO2 uptake by carbonate weathering, the approach proposed here involves discriminating the proportion of [Ca + Mg] in waters resulting from soil carbonic acid dissolution (equal to the amount of CO2 uptake from soil/atmosphere) from the proportion resulting from strong acid pollution. This approach was applied to 5 karst hydrosystems located in France, far from local pollution sources and with several decades of hydrochemical monitoring.[Ca + Mg] from acid deposition represented between 16 and 25% of the total [Ca + Mg] concentration and the flux was positively correlated with the atmospheric deposition flux. This [Ca + Mg] increase is associated with increasing [Mg] and was found to be driven by the acid pollution inputs. Equilibrating water with calcite in presence of carbonic acid will release [Ca + Mg] into solution. The input of strong acids from atmospheric pollution contributes more to magnesian calcite dissolution because its solubility is lower than that of calcite.Since the 1980s, the decrease in [Ca + Mg] production due to the decrease in acid atmospheric deposition has minimized the increase in [Ca + Mg] linked to CO2 partial pressure (pCO2) increasing with global warming. It was found that [Ca + Mg] from H2CO3 dissolution did not decrease with an increase in air temperature, as suggested by carbonate solubility. The annual fluxes of Ca + Mg from H2CO3 dissolution, calculated for an average flow, showed a positive gradient with air temperature, of about 0.061 mol m2 yr−1 °C−1 (±0.006). In low rainfall areas, the pCO2 increase with air temperature was stronger than in rainy areas. For an average specific discharge of 300 L m−2 yr−1, global warming is estimated to increase the CO2 uptake flux by about 204 micromol L−1 °C−1 (5.7% of the observed flux).
dc.language.isoen
dc.publisherElsevier
dc.subject.enCarbonate
dc.subject.enWeathering
dc.subject.enpCO2
dc.subject.enCarbon dioxide
dc.subject.enAcid Rain:Global warming Karst
dc.title.enGlobal warming and acid atmospheric deposition impacts on carbonate dissolution and CO2 fluxes in French karst hydrosystems: evidence from hydrochemical monitoring in recent decades
dc.typeArticle de revue
dc.identifier.doi10.1016/j.gca.2019.11.021
dc.subject.halSciences de l'environnement/Biodiversité et Ecologie
dc.subject.halSciences de l'environnement/Milieux et Changements globaux
dc.subject.halSciences de l'environnement/Ingénierie de l'environnement
dc.subject.halPlanète et Univers [physics]/Interfaces continentales, environnement
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Géochimie
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Hydrologie
dc.subject.halSciences du Vivant [q-bio]/Ecologie, Environnement/Ecosystèmes
dc.subject.halSciences du Vivant [q-bio]/Toxicologie/Ecotoxicologie
dc.subject.halSciences du Vivant [q-bio]/Sciences agricoles/Science des sols
bordeaux.journalGeochimica et Cosmochimica Acta
bordeaux.page184-200
bordeaux.volume270
bordeaux.hal.laboratoriesInstitut de Mécanique et d’Ingénierie de Bordeaux (I2M) - UMR 5295*
bordeaux.institutionUniversité de Bordeaux
bordeaux.institutionBordeaux INP
bordeaux.institutionCNRS
bordeaux.institutionINRAE
bordeaux.institutionArts et Métiers
bordeaux.peerReviewedoui
hal.identifierhal-02387529
hal.version1
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02387529v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Geochimica%20et%20Cosmochimica%20Acta&rft.date=2020&rft.volume=270&rft.spage=184-200&rft.epage=184-200&rft.eissn=0016-7037&rft.issn=0016-7037&rft.au=BINET,%20St%C3%A9phane&PROBST,%20J.L.&BATIOT-GUILHE,%20Christelle&SEIDEL,%20J.L.&EMBLANCH,%20C.&rft.genre=article


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