Cave ventilation is influenced by variations in the CO2-dependent virtual temperature
ISSN: 1827-806X (online)
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AuthorSánchez-Cañete, E. P.; Serrano-Ortiz, Penélope; Domingo Poveda, Francisco; Kowalski, Andrew S.
International Union of Speleology
BuoyancyCarbon dioxideCavesSoil ventilationVentilationVirtual temperature
Sánchez-Cañete, Enrique P.; Serrano-Ortiz, P.; Domingo, F.; Kowalski, A. S. Cave ventilation is influenced by variations in the CO2-dependent virtual. International Journal of Speleology 42: 1-8 (2013). [http://hdl.handle.net/10481/22402]
SponsorshipThis research was funded by the Andalusian regional government project GEOCARBO (P08- RNM-3721) and GLOCHARID, including European Union ERDF funds, with support from Spanish Ministry of Science and Innovation projects CarboredII (CGL2010-22193-C04-02), SOILPROF (CGL2011- 15276-E) and CARBORAD (CGL2011-27493), as well as the European Community’s Seventh Framework Programme (FP7/2007-2013) under grant agreement n° 244122.
Dynamics and drivers of ventilation in caves are of growing interest for different fields of science. Accumulated CO2 in caves can be exchanged with the atmosphere, modifying the internal CO2 content, affecting stalagmite growth rates, deteriorating rupestrian paintings or creating new minerals. Current estimates of cave ventilation neglect the role of high CO2 concentrations in determining air density – approximated via the virtual temperature (Tv) –, affecting buoyancy and therefore the release or storage of CO2. Here we try to improve knowledge and understanding of cave ventilation through the use of Tv in CO2-rich air to explain buoyancy for different values of temperature (T) and CO2 content. Also, we show differences between T and Tv for 14 different experimental sites in the vadose zone, demonstrating the importance of using the correct definition of Tv to determine air buoyancy in caves. The calculation of Tv (including CO2 effects) is currently available via internet using an excel template, requiring the input of CO2 (%), air temperature (ºC) and relative humidity (%).