Modeling of Carbon Dioxide Transport and Production in Soil 1. Model Development
Modeling of Carbon Dioxide Transport and Production in Soil 1. Model Development
复制标题
DOI：
10.1029/92wr02225
复制
发表时间：
1993-02
影响因子：
5.4
通讯作者：
J. Šimůnek;D. Suarez
中科院分区：
文献类型：
--
作者：
J. Šimůnek;D. Suarez
了解非饱和带中的二氧化碳浓度对于预测包气带中的溶液化学和地下水补给以及作为全球二氧化碳质量平衡的一部分来量化碳源/汇是至关重要的。本文提出了一种基于面向过程关系的预测仿真模型SOILCO2。该模型包括分别利用Richards方程和对流-弥散方程的一维水流和CO2的多相传输，以及热流和CO2产生模型。二氧化碳在非饱和区的传输可以发生在液体和气相中。气体传输方程解释了与根系水分吸收相关的植物根对二氧化碳的产生和吸收。二氧化碳产生模型同时考虑了微生物呼吸和根系呼吸，这取决于水分、温度、生长、盐度以及植物和土壤特性。由于一些气体传输参数、分配系数和生产参数与温度有很强的相关性，因此还包括热流。所得到的偏微分方程组使用有限元和有限差分方法进行数值求解。
Knowledge of the CO2 concentration in the unsaturated zone is essential for prediction of solution chemistry in the vadose zone and groundwater recharge as well as for quantifying carbon source/sink terms as part of the global CO2 mass balance. In this paper we present a predictive simulation model, SOILCO2, based on process-oriented relationships. The model includes one-dimensional water flow and multiphase transport of CO2 utilizing the Richards and the convection-dispersion equations, respectively, as well as heat flow and a CO2 production model. The transport of CO2 in the unsaturated zone can occur in both the liquid and gas phases. The gas transport equation accounts for production of CO2 and uptake of CO2 by plant roots associated with root water uptake. The CO2 production model considers both microbial and root respiration which is dependent on water content, temperature, growth, salinity and plant and soil characteristics. Heat flow is included, since some gas transport parameters, partitioning coefficients and production parameters are strongly temperature dependent. The resulting set of partial differential equations is solved numerically using the finite element and finite difference methods.