Summary of the article on CH4 Oxidation:

## CH4 Oxidation in CLM

The article discusses how the Community Land Model (CLM) represents the process of methane (CH4) oxidation using a double Michaelis-Menten kinetics approach. The key points are:

### Oxidation Equation
The CH4 oxidation rate (Roxic) is determined by the concentrations of CH4 (CCH4) and O2 (CO2), as well as temperature (Q10) and soil moisture (Fθ) factors:

Roxic = Ro,max * [CCH4 / (KCH4 + CCH4)] * [CO2 / (KO2 + CO2)] * Q10 * Fθ

where:
- Ro,max is the maximum oxidation rate
- KCH4 and KO2 are the half-saturation coefficients for CH4 and O2
- Q10 represents temperature dependence
- Fθ is the soil moisture limitation factor

### Soil Moisture Dependence
The soil moisture limitation factor Fθ is applied above the water table to account for water stress on methanotrophs. It is modeled as an exponential function of soil moisture potential (P) and a critical potential (Pc = -2.4 × 10^5 mm).

In summary, the article describes how CLM uses a dual-substrate oxidation kinetics approach, along with temperature and soil moisture effects, to model the CH4 oxidation process in the land surface.