Considerations for measuring ground CO2 effluxes with chambers

Autor:	D.K McDermitt, J.M Welles, T.H Demetriades-Shah
Rok vydání:	2001
Předmět:	Hydrology Advection Airflow Geology Atmospheric sciences Wind speed chemistry.chemical_compound Flux (metallurgy) chemistry Geochemistry and Petrology Carbon dioxide Diffusion (business) Geothermal gradient Water vapor
Zdroj:	Chemical Geology. 177:3-13
ISSN:	0009-2541
DOI:	10.1016/s0009-2541(00)00388-0
Popis:	This paper considers the factors that influence ground CO 2 fluxes as measured by the chamber method. New data and published results are used to illustrate the effects of various factors on CO 2 emissions from the ground. These factors are: pressure differences between the ambient air and the chamber, wind speed within the chamber, the chamber CO 2 concentration relative to ambient air concentration and the accumulation of water vapor in the chamber. A mathematical analysis of the accumulation of CO 2 in the chamber in terms of diffusion and advection (e.g., air flow out of the ground at geothermal degassing locations) shows that the same protocol should be followed, whether the mechanism of emission is purely by diffusion or by a combination of diffusion and advection. The analysis also yields a simple way for estimating soil CO 2 conductance and the soil CO 2 concentration at the depth of insertion of the chamber into the ground.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::edb57c86357cfff65e92ccc1017a9869 https://doi.org/10.1016/s0009-2541(00)00388-0 Zobrazit plný text záznamu Full Text from ScienceDirect