Parametrization of vertical diffusion
Three different processes are modelled by the vertical diffusion scheme: 1) Shallow convection - A redistribution of moisture and dry static energy between the lowest two layers where there is conditional instability 2) A slow diffusion of moisture in stable conditions 3) A fast redistribution of dry static energy where the lapse rate is close to the dry adiabatic limit
| Type | Visibility | Attributes | Name | Initial | |||
|---|---|---|---|---|---|---|---|
| real, | private, | parameter | :: | trshc | = | 6.0 | Relaxation time (in hours) for shallow convection |
| real, | private, | parameter | :: | trvdi | = | 24.0 | Relaxation time (in hours) for moisture diffusion |
| real, | private, | parameter | :: | trvds | = | 6.0 | Relaxation time (in hours) for super-adiabatic conditions |
| real, | private, | parameter | :: | redshc | = | 0.5 | Reduction factor of shallow convection in areas of deep convection |
| real, | private, | parameter | :: | rhgrad | = | 0.5 | Maximum gradient of relative humidity (d_RH/d_sigma) |
| real, | private, | parameter | :: | segrad | = | 0.1 | Minimum gradient of dry static energy (d_DSE/d_phi) |
Compute tendencies of momentum, energy and moisture due to vertical diffusion and shallow convection
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| real, | intent(in) | :: | se(ix,il,kx) | Dry static energy |
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| real, | intent(in) | :: | rh(ix,il,kx) | Relative humidity |
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| real, | intent(in) | :: | qa(ix,il,kx) | Specific humidity [g/kg] |
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| real, | intent(in) | :: | qsat(ix,il,kx) | Saturated specific humidity [g/kg] |
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| real, | intent(in) | :: | phi(ix,il,kx) | Geopotential |
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| integer, | intent(in) | :: | icnv(ix,il) | Sigma-level index of deep convection |
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| real, | intent(out) | :: | utenvd(ix,il,kx) | u-wind tendency |
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| real, | intent(out) | :: | vtenvd(ix,il,kx) | v-wind tendency |
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| real, | intent(out) | :: | ttenvd(ix,il,kx) | Temperature tendency |
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| real, | intent(out) | :: | qtenvd(ix,il,kx) | Specific humidity tendency |