Seasonal variations of CO2 and 222Rn in a mediterranean sinkhole


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Seasonal variations of CO2 and 222Rn in a mediterranean sinkhole

Material Information

Title:
Seasonal variations of CO2 and 222Rn in a mediterranean sinkhole
Series Title:
International Journal of Speleology
Creator:
Batiot-Guilhe, Christelle
Seidel, Jean-Luc
Jourde, Hervé
Hébrard, Olivier
Bailly-Comte, Vincent
Publication Date:
Language:
English

Subjects

Subjects / Keywords:
Co2 ( local )
222Rn ( local )
Karst ( local )
Cave ( local )
13C ( local )
France ( local )
Languedoc-Roussillon ( local )
Genre:
serial ( sobekcm )

Notes

Abstract:
Carbon dioxide and 222Rn monitoring of the atmosphere of a Mediterranean sink hole - spring (SE France) during two hydrological cycles (from September 2004 to September 2006) showed seasonal variations with very high concentrations during summer (greater than 6% and 20 000 Bq/m3, respectively). Gas dynamics in caves often show seasonal variations.Meteorological parameters (barometric pressure and temperature mainly), cave geometry and fracture networks control exchanges between the cavity and outside atmosphere. Carbon dioxide and 222Rn may have different sources (atmosphere, soil, bedrock, deep gas diffusion, in situ oxidation of organic matter and, in some caves, the key role of swift underground streams).For a CO2 origin, 13C measurements on water and gas samples taken into the cavity suggest a superficial origin. Radon-222 appears to be locally produced and transported by biogenic CO2. Further investigations will be carried out in order to study the relationship of gas-level variations with barometric pressure variations and piezometric level fluctuations within the aquifer.
Original Version:
International Journal of Speleology, Vol. 36, no. 1 (2007-01-01).

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University of South Florida Library
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University of South Florida
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This item is licensed with the Creative Commons Attribution Non-Commerical License. This license lets others remix, tweak, and build upon this work non-commercially, and although their new works must also acknowledge the author and be non-commercial, they don’t have to license their derivative works on the same terms.
Resource Identifier:
K26-00016 ( USFLDC: LOCAL DOI )
k26.16 ( USFLDC: LOCAL Handle )

USFLDC Membership

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University of South Florida
Karst Information Portal

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Available online at www.ijs.speleo.it International Journal of Speleology International Journal of Speleology 36 (1) 51-56 Bologna (Italy) January 2007 INTRODUCTION Batiot-Guilhe C., Seidel J.L., Jourde H., Hbrard O., Bailly-Comte V. 2007. Seasonal variations of CO 2 and 222 Rn in a Mediterranean sinkhole spring (Causse d’Aumelas, SE France). International Journal of Speleology, 36 (1), 51-56. Bologna (Italy). ISSN 0392-6672. Carbon dioxide and 222 Rn monitoring of the atmosphere of a Mediterranean sink hole spring (SE France) during two hydrological cycles (from September 2004 to September 2006) showed seasonal variations with very high concentrations during summer (greater than 6% and 20 000 Bq/m 3 , respectively). Gas dynamics in caves often show seasonal variations. Meteorological parameters (barometric pressure and temperature mainly), cave geometry and fracture networks control exchanges between the cavity and outside atmosphere. Carbon dioxide and 222 Rn may have different sources (atmosphere, soil, bedrock, deep gas diffusion, in situ oxidation of organic matter and, in some caves, the key role of swift underground streams). For a CO 2 origin, 13 appears to be locally produced and transported by biogenic CO 2 . Further investigations will be carried out in order to study Keywords: : CO 2 , 222 Rn, Karst, Cave, 13 C, France, Languedoc-Roussillon Abstract: Received 7 July 2006; Revised 27 September 2006; Accepted 24 November 2006 High in Seasonal variations of CO 2 and 222 Rn in a mediterranean sinkhole spring (Causse d’Aumelas, SE France)

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CO high CO STUDY AREA AND METHODS the CO RESULTS AND DISCUSSION Rn Christelle Batiot-Guilhe, Jean-Luc Seidel, Herv Jourde, Olivier Hbrard and Vincent Bailly-Comte International Journal of Speleology, 36 (1), 51-56. Bologna (Italy). January 2007

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Fig. 1. Study area and location of the estavelles Les Grandes-Combes and Puits de l’Aven. Fig. 2. Cross section and map of Les Grandes-Combes estavelle (from Vasseur, 1998). Seasonal variations of CO 2 and 222 Rn in a mediterranean sinkhole spring (Causse d’Aumelas, SE France) International Journal of Speleology, 36 (1), 51-56. Bologna (Italy). January 2007

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C on the magmatic CO 2 C C in C the CO origin Fig. 3. CO 2 and 222 Rn temporal variations measured in the Les Grandes Combes estavelle. Rainfall at la Tour. 13 C TDIC values, in VPDB (Clark and Fritz, 1997) and for karst waters sampled in the two estavelles (GC = Les Grandes Combes and PA = Puits de l’Aven). Christelle Batiot-Guilhe, Jean-Luc Seidel, Herv Jourde, Olivier Hbrard and Vincent Bailly-Comte International Journal of Speleology, 36 (1), 51-56 Bologna (Italy). January 2007

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that origin of CONCLUSION of CO C in ACKNOWLEDGEMENTS REFERENCES Distribution of deep carbon dioxide in relation to the structure and tectonic evolution of south-east France 7(2) Carbon dioxide in the atmosphere of the unsaturated zone: an important control of groundwater hardness in limestone 35 Etude exprimentale du cycle du carbone en rgions karstiques. Apport du carbone organique et du carbone minral la connaissance hydrogologique des systmes. Site exprimental de Vaucluse, Jura, Larzac, Rgion Nord-Montpelliraine, Nerja (Espagne) P CO2 – 13C : an interesting tool to characterize types of karstic aquifers Les eaux des calcaires jurassiques du bassin de Montbazin-Gigean et de ses bordures 2(3) Microclimate study of Kartchner caverns, Arizona 61 Microclimates of l’Aven d’Orgnac and other French limestones caves (Chauvet, Esparros, Marsoulas) 26 Le gaz carbonique dans la dynamique de l’atmosphre des cavits karstiques : l’exemple de l’Aven d’Orgnac (Ardche) 333 Air exchange within the buddhist cave temples at Yungang, China 30 (23) Radon in caves 34(1-2) Tracing the carbon cycle Environmental Isotopes in Hydrogeology Isotopic standards for carbon and oxygen and correction factors for mass spectrometric analysis of carbon dioxide 12 Cave climate: assessment of heat and moisture exchange. 7 Cave climate: assessment of 2 Water Gas Samples 13 C TDIC VPDB 13 C CO2 VPDB GC 30-9-04 -15.11 PA 30-9-04 -13.42 GC 06-10-04 -14.97 PA 06-10-04 -12.89 GC 11-10-04 -13.74 PA 11-10-04 -12.60 GC 05-07-05 -24.20 Water Gas Samples 13 C TDIC VPDB 13 C CO2 VPDB GC 30-9-04 -15.11 PA 30-9-04 -13.42 GC 06-10-04 -14.97 PA 06-10-04 -12.89 GC 11-10-04 -13.74 PA 11-10-04 -12.60 GC 05-07-05 -24.20 Table 1. Isotopic composition for 13 C contents ( VPDB) for water and gas sampled in Les Grandes Combes (GC) and Puits de l’Aven (PA) cavities. International Journal of Speleology, 36 (1), 51-56. Bologna (Italy). January 2007 Seasonal variations of CO 2 and 222 Rn in a mediterranean sinkhole spring (Causse d’Aumelas, SE France)

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rate and the radiation exposure level in the Nerja Cave 33 Carbon dioxide in cave atmospheres. New results in Belgium and comparison with some other countries 10 13 C of TDIC to quantify the role of the Unsaturated Zone : the example of the Vaucluse karst systems (Southeastern France) 279 (1-4) Caracterizacion microclimatica Hydrothermalisme carbo-gazeux, radioactivit et sismotectonique: exemple du Languedoc-Roussillon 4 Radon transport in fractured porous media – Experimental study in caves. 22 (1) Radon monitoring in caves. Radon measurements by etched track detectors. Applications in radiation protection, earth sciences and the environment Radon transport phenomena studied in karst caves – International experiences on radon levels and exposures 28 (1-6) Carbon dioxide in the cave atmosphere. 4 (4) Dynamics and contribution of karst groundwater to Radon measurements in karst caves in Slovenia. 22 (1) Utilisation des lments traces comme traceurs des circulations souterraines en milieu karstique (Site du Lamalou, Hrault). Radon concentration changes in the air of two caves in Poland. 45 Sur la distinction de plusieurs rgions karstiques en raison de la teneur en anhydride carbonique des atmosphres de grottes. 267 Inter-relationships between cave and outside air temperatures. 44 Sur les palmes d’Henri Lombard Geomorphology and Hydrology of Karst Terrains. Origin of caves and other solution openings in the unsaturated (vadose) zone of carbonate rocks: a model for CO2 generation. 13 Origin and distribution of carbon dioxide in the unsaturated zone of the southern High Plains. 20 Christelle Batiot-Guilhe, Jean-Luc Seidel, Herv Jourde, Olivier Hbrard and Vincent Bailly-Comte International Journal of Speleology, 36 (1), 51-56. Bologna (Italy). January 2007


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