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A Simple Tool for the Inverse Estimation of Soil Gas Diffusion Coefficients
Author(s) -
Schwen Andreas,
Böttcher Jürgen
Publication year - 2013
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj2012.0347n
Subject(s) - diffusion , gaseous diffusion , soil gas , soil water , sampling (signal processing) , inverse , transient (computer programming) , convection , gas phase , inert gas , soil science , chemistry , mechanics , environmental science , thermodynamics , physics , mathematics , computer science , optics , geometry , organic chemistry , electrode , detector , operating system
For the calculation of gas fluxes through soils, the soil gas diffusion coefficient D s needs to be known. D s can be derived from diffusion chamber experiments or from field experiments measuring diffusive gas fluxes across larger spatial scales. Within these methods, the gas concentration depletion or enrichment in an accumulation chamber is used to derive D s based on Fick's law. However, since this approach does not account for retardation of soluble gases in the soil water phase, the applicability is restricted to rather inert gases. The method also does not account for convective fluxes due to sampling. To overcome these limitations and to enable the applicability of an earlier presented two‐side in situ method, D s needs to be estimated inversely from the transient diffusion experiments. In this paper, a convenient computer tool is presented that allows the estimation of D s from diffusion chamber experiments and two in situ methods.