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Estimation of epikarst air P CO 2 using measurements of water δ 13 C TDIC, cave air P CO 2 and δ 13 C CO 2

hal.structure.identifierInstitut de Mécanique et d'Ingénierie de Bordeaux [I2M]
hal.structure.identifierService National d'Observation sur le KARST [SNO Karst]
dc.contributor.authorPEYRAUBE, Nicolas
IDREF: 157074005
hal.structure.identifierInstitut de Mécanique et d'Ingénierie de Bordeaux [I2M]
dc.contributor.authorLASTENNET, Roland
IDREF: 079112056
hal.structure.identifierInteractions et dynamique des environnements de surface [IDES]
dc.contributor.authorDENIS, Alain
IDREF: 095129243
hal.structure.identifierInstitut de Mécanique et d'Ingénierie de Bordeaux [I2M]
dc.contributor.authorMALAURENT, P.
dc.date.accessioned2021-05-14T09:30:43Z
dc.date.available2021-05-14T09:30:43Z
dc.date.issued2013-10
dc.identifier.issn0016-7037
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/75834
dc.description.abstractEnWhen present, an epikarst represents the starting point (the first karst compartment) of water flow through a karst system. The air characteristics in a karst, and especially in an epikarst, determine the initial water characteristics, e.g., water aggressiveness, which depends on the partial pressure of CO 2 ( P CO 2 ) in equilibrium with water. This paper proposes a method to estimate P CO 2 in epikarst air using spring water measures as HCO 3 - , temperature, pH and δ 13 C of Total Dissolved Inorganic Carbon (TDIC) and cave air measures as P CO 2 and δ 13 C of CO 2 . This method accounts for the TDIC variations of δ 13 C that are caused by CO 2 degassing and calcite precipitation from water. The calculations are based on the influence of pH variations and carbon loss on δ 13 C of TDIC. Measurements are taken at two sites: Lascaux cave and the Cussac cave sites located in Perigord, southwest of France. Four water springs are presented in this case study: two springs from an epikarst compartment, one spring from an unsaturated zone and one spring from a saturated zone. The P CO 2 in epikarst air is estimated to be from 4.4% (44,000 ppm) in winter to 10% in summer. These values are higher than the values of air P CO 2 measured in the soil (0.27–1.60%) or in the caves (0.30–3.1%, up to 7.50% in some parts of Lascaux). We show that in epikarst air, P CO 2 and δ 13 C CO 2 are not constant values but vary annually with high P CO 2 and depleted values (−22.31‰ VPDB) in the winter and higher P CO 2 and more depleted values in the summer (−24.20‰ VPDB).
dc.language.isoen
dc.publisherElsevier
dc.title.enEstimation of epikarst air P CO 2 using measurements of water δ 13 C TDIC, cave air P CO 2 and δ 13 C CO 2
dc.typeArticle de revue
dc.identifier.doi10.1016/j.gca.2013.03.046
dc.subject.halPlanète et Univers [physics]/Interfaces continentales, environnement
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Hydrologie
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Géochimie
bordeaux.journalGeochimica et Cosmochimica Acta
bordeaux.page1-17
bordeaux.volume118
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-03164220
hal.version1
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-03164220v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Geochimica%20et%20Cosmochimica%20Acta&rft.date=2013-10&rft.volume=118&rft.spage=1-17&rft.epage=1-17&rft.eissn=0016-7037&rft.issn=0016-7037&rft.au=PEYRAUBE,%20Nicolas&LASTENNET,%20Roland&DENIS,%20Alain&MALAURENT,%20P.&rft.genre=article


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