| 19 | | * '''Calculation of the anaerobic balloon'''. Nitrification and denitrification are varying (oppositely) depending of the anaerobic condition in soils as done in Li et al., 2000. This is done by using a variable named anvf (for ANaerobic Volumetric Fraction). In Li et al. (2000), anvf is calculated using the air-filled porosity (afps). In OCN, the calculation of afps is not, and anvf is only varying with humidity [source:branches/orchidee-N/ORCHIDEE/src_stomate/stomate_soilcarbon.f90@19#L665, here] |
| | 19 | * '''Calculation of the anaerobic balloon'''. Nitrification and denitrification are varying (oppositely) depending of the anaerobic condition in soils as done in Li et al., 2000. This is done by using a variable named anvf (for ANaerobic Volumetric Fraction). In Li et al. (2000), anvf is calculated using the oxygen diffusion coefficient (Ds) which makes use of the air-filled porosity (afps). In OCN, the calculation of afps is defined with the following equation but not used later in the calculation of Ds. (See, [source:branches/orchidee-N/ORCHIDEE/src_stomate/stomate_soilcarbon.f90@19#L665, here]) |
| | 20 | {{{ |
| | 21 | d_ox(:) = 1.73664 * ( 0.15 * (exp(-(soilhum_av(:)**3.)/0.44)-exp(-1./0.44))) * & |
| | 22 | (1.+0.007*tsoil_av(:)) |
| | 23 | }}} |
| | 24 | So, in OCN, diffusion is not function of afps/afps_max ratio but accounts for soilhum and soil temperature according to Monteith & Unsworth, 1990. [[BR]] |
| | 25 | |
| | 26 | We keep here the original formulation of Li et al., 2000 |
