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@article{1685082,
author = {Faimon, Jiří and Lang, Marek and Gersl, Milan and Sracek, Ondra and Babek, Ondrej},
article_location = {Wien},
article_number = {1-2},
doi = {http://dx.doi.org/10.1007/s00704-020-03280-7},
keywords = {carbon-dioxide; subterranean ventilation; CO2 concentrations; nullarbor plain; vadose zone; cave-air; flow; transport; buoyancy; efflux},
language = {eng},
issn = {0177-798X},
journal = {Theoretical and Applied Climatology},
title = {The "breathing spots" in karst areas-the sites of advective exchange of gases between soils and adjacent underground cavities},
url = {https://doi.org/10.1007/s00704-020-03280-7},
volume = {142},
year = {2020}
}
TY - JOUR
ID - 1685082
AU - Faimon, Jiří - Lang, Marek - Gersl, Milan - Sracek, Ondra - Babek, Ondrej
PY - 2020
TI - The "breathing spots" in karst areas-the sites of advective exchange of gases between soils and adjacent underground cavities
JF - Theoretical and Applied Climatology
VL - 142
IS - 1-2
SP - 85-101
EP - 85-101
PB - Springer Vienna
SN - 0177798X
KW - carbon-dioxide
KW - subterranean ventilation
KW - CO2 concentrations
KW - nullarbor plain
KW - vadose zone
KW - cave-air
KW - flow
KW - transport
KW - buoyancy
KW - efflux
UR - https://doi.org/10.1007/s00704-020-03280-7
L2 - https://doi.org/10.1007/s00704-020-03280-7
N2 - Microclimatic processes were studied in the soil of the well-defined "breathing spot" named Pulhodina (BSP) in the Hranice Karst (Czech Republic). The results have indicated that air is exchanged between the external atmosphere and a supposed underground cavity under air-buoyancy control. Upward airflow ventilation mode (UAF mode) and downward airflow ventilation mode (DAF mode) were distinguished. The virtual temperature of switching between both modes was about 16.5 degrees C. At the UAF mode, the underground air is rising from the cavity through the BSP, warms soil, and carries out the underground CO2. At the DAF mode, the external air is sucked into the cavity through the BSP soil, promoting the advective flux of the soil-respired CO(2)deeper into the cavity. Whereas the warming of the soil is a dominant process in the UAF mode, the CO(2)advective flux into the cavity is the main process in the DAF mode. The simplified mathematical model was derived as a function of the external air temperature and the soil air temperature to simulate the time evolution of CO(2)concentration in the BSP. Despite simplifying assumptions, this model showed a good agreement with the collected data. The advective CO(2)flux from a breathing spot soil may significantly contribute to the total CO(2)flux into the adjacent underground cavity. Its total values may reach 4 x 10(-3) mol s(-1)or even more, based on the actual CO(2)concentration, the exchanged airflow magnitude (both controlled by external temperature), and the breathing spot area. This conclusion is important for karsologists studying the cave CO(2)budget, CO(2)sources, and the mechanisms of CO(2)transport into caves.
ER -
FAIMON, Jiří, Marek LANG, Milan GERSL, Ondra SRACEK a Ondrej BABEK. The ''breathing spots'' in karst areas-the sites of advective exchange of gases between soils and adjacent underground cavities. \textit{Theoretical and Applied Climatology}. Wien: Springer Vienna, 2020, roč.~142, 1-2, s.~85-101. ISSN~0177-798X. Dostupné z: https://dx.doi.org/10.1007/s00704-020-03280-7.
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