Project CAMS52a
Wetland CH4 emission model improvement

Updated model formulation

\( \frac{\displaystyle dT_\mathsf{CH4}}{\displaystyle dt} = S_\mathsf{CH4} - F_\mathsf{CH4} \)

\( S_\mathsf{CH4} = s \cdot f_\mathsf{wet} \cdot \mathsf{RVR0VT} \cdot q_{10}^{\frac{\mathsf{PTSOIL(1)-25}}{10}}\)

\( F_\mathsf{CH4} = \lambda \cdot \mathsf{FSN} \cdot \mathsf{FWCO2} \cdot T_\mathsf{CH4} \)

• \( T_\mathsf{CH4} \) - methane stock in the soil [kgCH4/m2]
• \( S_\mathsf{CH4} \) - methane source (production) in the soil [kgCH4/m2/s]
• \( F_\mathsf{CH4} \) - methane flux from the surface to atmosphere [kgCH4/m2/s]
• \( s \) - scaling factor
• \( f_\mathsf{wet} \) - wetland extent fraction
• \( \mathsf{RVR0VT} \) - reference respiration (tabulated in CTESSEL by vegetation type) [kgCO2/m2/s]
• \( q_{10} \) - temperature dependency factor
• \( \mathsf{PTSOIL(1)} \) - first soil layer temperature [°C]
• \( \lambda \) - methane emission time constant [1/s]
• \( \mathsf{FSN} \) - attenuation function for snow pack (calculated in CTESSEL)
• \( \mathsf{FWCO2} \) - scaling factor accounting for soil moisture effect on respiration (calculated in CTESSEL)