Most important changes are on the oxidation process in the soil. New Switch Methane Soil Oxidation.
The New version has a new equation where the oxidation rate is governed by the Methane concentration i air pore space and not i the Methane concentration of water as in the original approach. In addtion to this the new approach is also additing a temperature response to the oxidation rate.
Another major change is that the aerodyanmic resistance of the soil boundary layer is now described as Resistance parameters CH4 Resistance Air.
![](https://www.coupmodel.com/wp-content/uploads/2020/03/MethaneBoundaryFlux.png)
![](https://www.coupmodel.com/wp-content/uploads/2020/03/MethaneBoundaryFluxPar-1024x44.png)
All basic parameters in the Methane model have now view functions. For each parameter the user can view the function check the understanding of the parameter values prior the simulation.
![](https://www.coupmodel.com/wp-content/uploads/2020/03/MethaneParameters-1024x256.png)
In addtion the assumed equilbrium between the liquid phase and the gas phase an important part of the model. This function is named as the Methane Volatilty Function and has 3 parameters from the Henry Law.
![](https://www.coupmodel.com/wp-content/uploads/2020/03/HenryLaw-1024x91.png)
This Function consider both the concentration in water to output the concentration in air at different temperatures.
![](https://www.coupmodel.com/wp-content/uploads/2020/03/HenryLawChart.png)
Please update to the new model if you want to examine the new Methane submodel.