The "breathing spots" in karst areas-the sites of advective exchange of gases between soils and adjacent underground cavities

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. 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.

Základní údaje

Originální název

The "breathing spots" in karst areas-the sites of advective exchange of gases between soils and adjacent underground cavities

Autoři

FAIMON, Jiří (203 Česká republika, garant, domácí), Marek LANG (203 Česká republika, domácí), Milan GERSL, Ondra SRACEK a Ondrej BABEK

Vydání

Theoretical and Applied Climatology, Wien, Springer Vienna, 2020, 0177-798X

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Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10509 Meteorology and atmospheric sciences

Stát vydavatele

Rakousko

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 3.179

Kód RIV

RIV/00216224:14310/20:00116654

Organizační jednotka

Přírodovědecká fakulta

DOI

http://dx.doi.org/10.1007/s00704-020-03280-7

UT WoS

000543289000001

Klíčová slova anglicky

carbon-dioxide; subterranean ventilation; CO2 concentrations; nullarbor plain; vadose zone; cave-air; flow; transport; buoyancy; efflux

Štítky

rivok

Příznaky

Mezinárodní význam, Recenzováno

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Anotace

V originále

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.