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| Titel |
Technical Note: Simple formulations and solutions of the dual-phase diffusive transport for biogeochemical modeling |
| VerfasserIn |
J. Y. Tang, W. J. Riley |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 11, no. 14 ; Nr. 11, no. 14 (2014-07-17), S.3721-3728 |
| Datensatznummer |
250117513
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| Publikation (Nr.) |
 copernicus.org/bg-11-3721-2014.pdf |
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| Zusammenfassung |
| Representation of gaseous diffusion in variably saturated near-surface soils
is becoming more common in land biogeochemical models, yet the formulations
and numerical solution algorithms applied vary widely. We present three
different but equivalent formulations of the dual-phase (gaseous and aqueous)
tracer diffusion transport problem that is relevant to a wide class of
volatile tracers in land biogeochemical models. Of these three formulations
(i.e., the gas-primary, aqueous-primary, and bulk-tracer-based formulations),
we contend that the gas-primary formulation is the most convenient for
modeling tracer dynamics in biogeochemical models. We then provide finite
volume approximation to the gas-primary equation and evaluate its accuracy
against three analytical models: one for steady-state soil CO2 dynamics,
one for steady-state soil CH4 dynamics, and one for transient tracer
diffusion from a constant point source into two different sequentially
aligned medias. All evaluations demonstrated good accuracy of the numerical
approximation. We expect our result will standardize an efficient mechanistic
numerical method for solving relatively simple, multi-phase, one-dimensional
diffusion problems in land models. |
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