Simple Dual-Phase Diffusion Solutions for Biogeochemical Modeling in Soil
This paper presents a straightforward, precise, and robust numerical approach to model dual-phase diffusion of dissolvable volatile gases in variably saturated soil. By developing three equivalent forms of dual-phase diffusion and applying the finite volume method, we benchmarked our algorithm against three analytical solutions covering both steady-state and transient scenarios common in terrestrial biogeochemical modeling. The new formulation standardizes the representation of dual-phase diffusion for multiple volatile tracers and is now integrated into the CLM4.5-BeTR code, expected to feature in the upcoming CLM5 release.
Simple Dual-Phase Diffusion Solutions for Biogeochemical Modeling in Soil
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Presentation Transcript
Simple formulations and solutions of dual-phase diffusive transport for biogeochemical modeling Objective This paper aimed to propose a simple, accurate, and robust numerical representation of dual-phase diffusion of dissolvable volatile gases in variably saturated soil. Benchmark against analytical solutions Research By formulating the dual-phase diffusion into three equivalent forms, we solved the gas-primary form using the finite volume method. We benchmarked our algorithm against three analytical solutions of steady-state and transient scenarios common in land biogeochemical modeling. Impact The new formulation and its solution standardize the representation of dual-phase diffusion for multiple volatile tracers. The approach is now integrated in the CLM4.5-BeTR code and will be part of the next released version of the land model (CLM5). Reference: Tang, J. Y. and Riley, W. J.: Technical Note: Simple formulations and solutions of the dual-phase diffusive transport for biogeochemical modeling, Biogeosciences, 11, 3721-3728, doi:10.5194/bg-11-3721-2014, 2014.
