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| Titel |
Isotopic (18O) signature of CO2-H2O vapor exchange in the vadose air of Nerja cave (Malaga, Spain) |
| VerfasserIn |
Iñaki Vadillo, Lucía Ojeda, José Benavente, Cristina Liñán, Yolanda del Rosal, Francisco Carrasco |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250149934
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| Publikation (Nr.) |
 EGU/EGU2017-14342.pdf |
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| Zusammenfassung |
| In caves, carbon dioxide contents and its δ13C signature have been widely studied to provide
information about the ventilation regime and the source of carbon dioxide. However,
less has been researched about δ18O signature in vadose air. We analysed cave-air
samples for the CO2 concentration and oxygen isotopic composition from a monthly
sampling campaigns for two years within different halls in Nerja cave. In general terms,
ventilation controls the variation of CO2 content seasonally, showing two distinct modes
with the highest values in summer. The δ18O values range from -8.74 to +0.47
‰ being maximum in January and minimum in September, coinciding with the
lowest and highest humidity values within the cave respectively. We found that a gas
exchange between δ18O-CO2 and δ18O-H2O vapor is carried out and pattern is
repeated every season, showing the importance that water has in karst environment. |
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