Karst cave, a seasonal carbon dioxide exchanger: an example of Sloup-Šošůvka Caves (Moravian Karst)

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Authors	FAIMON Jiří LANG Marek ŠTELCL Jindřich REZ Jiří BALDÍK Vít HEBELKA Jiří
Year of publication	2024
Type	Article in Periodical
Magazine / Source	Theoretical and Applied Climatology
MU Faculty or unit	Faculty of Science
Citation
Web	https://link.springer.com/article/10.1007/s00704-024-05049-8
Doi	http://dx.doi.org/10.1007/s00704-024-05049-8
Keywords	Carbon Dioxide Flux; Carbon Cycle; Karst Cave; Seasonal Exchanger; Annual Cycle
Description	Part of the gaseous carbon dioxide (CO2) produced in karst soils / epikarst is transported into underground cavities / caves during the growing season by advective flux, diffusive flux, and flux associated with degassing of seeping water. In dynamic caves, accumulated CO2 is released into the outside atmosphere during the autumn-winter period through advective flux associated with ventilation of the cave in the upward airflow mode. This case study from the Moravian Karst (MK) showed that the net weight of CO2 released annually from the Sloup-Šošůvka Caves (total volume of 131,580 m3 and a total area of 17,950 m2) into the external atmosphere was 348 kg. Extrapolating this value to all known MK caves (area about 352,080 m2) yielded a total of CO2 flux of 6820 kg yr-1. This flux is representing only 0.024‰ of the annual soil respiration from entire MK area (about 2.81?×?108 kg CO2 yr-1).