The role of near-surface cavities in the carbon dioxide cycle of karst areas: evidence from the Carburangeli Cave Natural Reserve (Italy)
- Permanent Link:
- The role of near-surface cavities in the carbon dioxide cycle of karst areas: evidence from the Carburangeli Cave Natural Reserve (Italy)
- Series Title:
- Environmental Earth Sciences
- Madonia, Paolo
Di Pietro, Rosario
- Publication Date:
- Subjects / Keywords:
- Karst Conduits ( local )
Carbon Dioxide ( local )
Carburangeli Cave ( local )
- serial ( sobekcm )
- Hydrological, chemical and meteorological data collected during the years 2006â€“2007 at Carburangeli Cave (Italy) have provided new insights on the near-surface cycle of carbon dioxide, particularly concerning the role played by fractures and karst conduits. Carbon dioxide is trapped in the underground atmosphere essentially when its temperature is lower than the outer one. By contrast, convective air circulation disperses all the excess CO2 in the external environment when the thermal differential is inverted. The network of fractures and karst conduits then works, in the vadose zone, as a re-circulator of CO2 from the soil to the atmosphere. The total amount of CO2 fixed in the underground is controlled, during the wet season, by the amount of infiltrating waters, which act as the main carrier of CO2 in the subsoil. By contrast, during the dry season, gravitational drainage is responsible for the accumulation of carbon dioxide in the underground voids. The quantitative balance demonstrated that the degassed CO2 amounts are one order of magnitude higher than the dissolved CO2. In light of this, if the near-surface outgassing processes are not taken into account, CO2 budgets may be affected by significant errors.
- Original Version:
- Environmental Earth Sciences, Vol. 67, no. 8 (2012-05-04).
- Source Institution:
- University of South Florida Library
- Holding Location:
- University of South Florida
- Rights Management:
- This object is protected by copyright, and is made available here for research and educational purposes. Permission to reuse, publish, or reproduce the object beyond the bounds of Fair Use or other exemptions to copyright law must be obtained from the copyright holder.
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