Parametrization of convection
Convection is modelled using a simplified version of the Tiedke (1993) mass-flux convection scheme.
| Type | Visibility | Attributes | Name | Initial | |||
|---|---|---|---|---|---|---|---|
| real, | private, | parameter | :: | psmin | = | 0.8 | Minimum (normalised) surface pressure for the occurrence of convection |
| real, | private, | parameter | :: | trcnv | = | 6.0 | Time of relaxation (in hours) towards reference state |
| real, | private, | parameter | :: | rhbl | = | 0.9 | Relative humidity threshold in the boundary layer |
| real, | private, | parameter | :: | rhil | = | 0.7 | Relative humidity threshold in intermeduate layers for secondary mass flux |
| real, | private, | parameter | :: | entmax | = | 0.5 | Maximum entrainment as a fraction of cloud-base mass flux |
| real, | private, | parameter | :: | smf | = | 0.8 | Ratio between secondary and primary mass flux at cloud-base |
Compute convective fluxes of dry static energy and moisture using a simplified mass-flux scheme
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| real, | intent(in) | :: | psa(ix,il) | Normalised surface pressure [p/p0] |
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| real, | intent(in) | :: | se(ix,il,kx) | Dry static energy [c_p.T + g.z] |
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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) | Saturation specific humidity [g/kg] |
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| integer, | intent(out) | :: | itop(ix,il) | Top of convection (layer index) |
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| real, | intent(out) | :: | cbmf(ix,il) | Cloud-base mass flux |
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| real, | intent(out) | :: | precnv(ix,il) | Convective precipitation [g/(m^2 s)] |
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| real, | intent(out) | :: | dfse(ix,il,kx) | Net flux of dry static energy into each atmospheric layer |
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| real, | intent(out) | :: | dfqa(ix,il,kx) | Net flux of specific humidity into each atmospheric layer |
Diagnose convectively unstable gridboxes
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| real, | intent(in) | :: | psa(ix,il) | Normalised surface pressure [p/p0] |
||
| real, | intent(in) | :: | se(ix,il,kx) | Dry static energy [c_p.T + g.z] |
||
| real, | intent(in) | :: | qa(ix,il,kx) | Specific humidity [g/kg] |
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| real, | intent(in) | :: | qsat(ix,il,kx) | Saturation specific humidity [g/kg] |
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| integer, | intent(out) | :: | itop(ix,il) | Top of convection (layer index) |
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| real, | intent(out) | :: | qdif(ix,il) | Excess humidity in convective gridboxes |