Carbon dioxide seasonality in dynamically ventilated caves: the role of advective fluxes

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F17%3A73581060" target="_blank" >RIV/61989592:15310/17:73581060 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216224:14310/17:00095865

Výsledek na webu

<a href="https://link.springer.com/article/10.1007%2Fs00704-016-1858-y" target="_blank" >https://link.springer.com/article/10.1007%2Fs00704-016-1858-y</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s00704-016-1858-y" target="_blank" >10.1007/s00704-016-1858-y</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Carbon dioxide seasonality in dynamically ventilated caves: the role of advective fluxes

Popis výsledku v původním jazyce

The seasonality in cave CO2 levels was studied based on (1) a new data set from the dynamically ventilated Comblain-au-Pont Cave (Dinant Karst Basin, Belgium), (2) archive data from Moravian Karst caves, and (3) published data from caves worldwide. A simplified dynamic model was proposed for testing the effect of all conceivable CO2 fluxes on cave CO2 levels. Considering generally accepted fluxes, i.e., the direct diffusive flux from soils/epikarst, the indirect flux derived from dripwater degassing, and the input/output fluxes linked to cave ventilation, gives the cave CO2 level maxima of 1.9 x 10(-2) mol m(-3) (i.e., similar to 440 ppmv), which only slightly exceed external values. This indicates that an additional input CO2 flux is necessary for reaching usual cave CO2 level maxima. The modeling indicates that the additional flux could be a convective advective CO2 flux from soil/epikarst driven by airflow (cave ventilation) and enhanced soil/epikarstic CO2 concentrations. Such flux reaching up to 170 mol s(-1) is capable of providing the cave CO2 level maxima up to 3 x 10(-2) mol m(-3) (70,000 ppmv). This value corresponds to the maxima known from caves worldwide. Based on cave geometry, three types of dynamic caves were distinguished: (1) the caves with the advective CO2 flux from soil/epikarst at downward airflow ventilation mode, (2) the caves with the advective soil/epikarstic flux at upward airflow ventilation mode, and (3) the caves without any soil/epikarstic advective flux. In addition to CO2 seasonality, the model explains both the short-term and seasonal variations in delta C-13 in cave air CO2.

Název v anglickém jazyce

Carbon dioxide seasonality in dynamically ventilated caves: the role of advective fluxes

Popis výsledku anglicky

The seasonality in cave CO2 levels was studied based on (1) a new data set from the dynamically ventilated Comblain-au-Pont Cave (Dinant Karst Basin, Belgium), (2) archive data from Moravian Karst caves, and (3) published data from caves worldwide. A simplified dynamic model was proposed for testing the effect of all conceivable CO2 fluxes on cave CO2 levels. Considering generally accepted fluxes, i.e., the direct diffusive flux from soils/epikarst, the indirect flux derived from dripwater degassing, and the input/output fluxes linked to cave ventilation, gives the cave CO2 level maxima of 1.9 x 10(-2) mol m(-3) (i.e., similar to 440 ppmv), which only slightly exceed external values. This indicates that an additional input CO2 flux is necessary for reaching usual cave CO2 level maxima. The modeling indicates that the additional flux could be a convective advective CO2 flux from soil/epikarst driven by airflow (cave ventilation) and enhanced soil/epikarstic CO2 concentrations. Such flux reaching up to 170 mol s(-1) is capable of providing the cave CO2 level maxima up to 3 x 10(-2) mol m(-3) (70,000 ppmv). This value corresponds to the maxima known from caves worldwide. Based on cave geometry, three types of dynamic caves were distinguished: (1) the caves with the advective CO2 flux from soil/epikarst at downward airflow ventilation mode, (2) the caves with the advective soil/epikarstic flux at upward airflow ventilation mode, and (3) the caves without any soil/epikarstic advective flux. In addition to CO2 seasonality, the model explains both the short-term and seasonal variations in delta C-13 in cave air CO2.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10509 - Meteorology and atmospheric sciences

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Theoretical and Applied Climatology

ISSN

0177-798X

e-ISSN

—

Svazek periodika

129

Číslo periodika v rámci svazku

3-4

Stát vydavatele periodika

AT - Rakouská republika

Počet stran výsledku

17

Strana od-do

1355-1372

Kód UT WoS článku

000406123400048

EID výsledku v databázi Scopus

2-s2.0-84977103292