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.identifier | Service National d'Observation sur le KARST [SNO Karst] | |
| dc.contributor.author | PEYRAUBE, Nicolas
IDREF: 157074005 | |
| dc.contributor.author | LASTENNET, Roland
IDREF: 079112056 | |
| hal.structure.identifier | Interactions et dynamique des environnements de surface [IDES] | |
| dc.contributor.author | DENIS, Alain
IDREF: 095129243 | |
| dc.contributor.author | MALAURENT, P. | |
| dc.date.accessioned | 2021-05-14T09:30:43Z | |
| dc.date.available | 2021-05-14T09:30:43Z | |
| dc.date.issued | 2013-10 | |
| dc.identifier.issn | 0016-7037 | |
| dc.identifier.uri | https://oskar-bordeaux.fr/handle/20.500.12278/75834 | |
| dc.description.abstractEn | When 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.iso | en | |
| dc.publisher | Elsevier | |
| dc.title.en | 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 | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1016/j.gca.2013.03.046 | |
| dc.subject.hal | Planète et Univers [physics]/Interfaces continentales, environnement | |
| dc.subject.hal | Planète et Univers [physics]/Sciences de la Terre/Hydrologie | |
| dc.subject.hal | Planète et Univers [physics]/Sciences de la Terre/Géochimie | |
| bordeaux.journal | Geochimica et Cosmochimica Acta | |
| bordeaux.page | 1-17 | |
| bordeaux.volume | 118 | |
| bordeaux.hal.laboratories | Institut de Mécanique et d’Ingénierie de Bordeaux (I2M) - UMR 5295 | * |
| bordeaux.institution | Université de Bordeaux | |
| bordeaux.institution | Bordeaux INP | |
| bordeaux.institution | CNRS | |
| bordeaux.institution | INRAE | |
| bordeaux.institution | Arts et Métiers | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-03164220 | |
| hal.version | 1 | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-03164220v1 | |
| bordeaux.COinS | ctx_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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