Radiative transfer schemes : Différence entre versions
De LMDZPedia
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* the "legacy" (oldest) radiative scheme: always available. May be selected using the '''iflag_rrtm=0''' option in physiq.def. Note that this schemes also requires using 2 bands in the SW (Short Wave, i.e. visible wavelengths), i.e. setting '''NSW=2''' in physiq.def | * the "legacy" (oldest) radiative scheme: always available. May be selected using the '''iflag_rrtm=0''' option in physiq.def. Note that this schemes also requires using 2 bands in the SW (Short Wave, i.e. visible wavelengths), i.e. setting '''NSW=2''' in physiq.def | ||
* RRTM, selected with '''iflag_rrtm=1''' (and requiring that '''NSW=6'''), which is available if the GCM has been compiled with the '''-rad rrtm''' option (see [[WhatIs: The makelmdz fcm script]]). | * RRTM, selected with '''iflag_rrtm=1''' (and requiring that '''NSW=6'''), which is available if the GCM has been compiled with the '''-rad rrtm''' option (see [[WhatIs: The makelmdz fcm script]]). | ||
| − | * ECRAD (implementation is ongoing at the time of writing this) , selected with '''iflag_rrtm=2''', which is available if the GCM has been compiled with the '''-rad ecrad''' option. | + | * ECRAD (implementation is ongoing at the time of writing this) , selected with '''iflag_rrtm=2''', which is available if the GCM has been compiled with the '''-rad ecrad''' option. |
| − | + | ||
| − | + | ECRad has three sub-options for the treatment of clouds: | |
| − | + | * McICA : Monte Carlo Independent Column Approximation. Assez rapide, comme si on faisait des sondages, on tire une dizaine de sous-colonnes. | |
| + | * triple cloud : trois colonnes par maille : ciel clair, nuageux compact, nuageux intermédiraire. Le plus proche de RRTM. | ||
| + | * triple cloud avec Spartacus : effet 3D des nuages, multiplie par 5 le temps d'exécution du rayonnement. | ||
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| + | ECRad also has two sub-options for the treatment of the gas phase: | ||
| + | * RRTMG | ||
| + | * ECCKD | ||
Version du 3 avril 2023 à 13:31
There are different radiative schemes that can be used in LMDZ:
- the "legacy" (oldest) radiative scheme: always available. May be selected using the iflag_rrtm=0 option in physiq.def. Note that this schemes also requires using 2 bands in the SW (Short Wave, i.e. visible wavelengths), i.e. setting NSW=2 in physiq.def
- RRTM, selected with iflag_rrtm=1 (and requiring that NSW=6), which is available if the GCM has been compiled with the -rad rrtm option (see WhatIs: The makelmdz fcm script).
- ECRAD (implementation is ongoing at the time of writing this) , selected with iflag_rrtm=2, which is available if the GCM has been compiled with the -rad ecrad option.
ECRad has three sub-options for the treatment of clouds:
- McICA : Monte Carlo Independent Column Approximation. Assez rapide, comme si on faisait des sondages, on tire une dizaine de sous-colonnes.
- triple cloud : trois colonnes par maille : ciel clair, nuageux compact, nuageux intermédiraire. Le plus proche de RRTM.
- triple cloud avec Spartacus : effet 3D des nuages, multiplie par 5 le temps d'exécution du rayonnement.
ECRad also has two sub-options for the treatment of the gas phase:
- RRTMG
- ECCKD
