Radiative transfer schemes : Différence entre versions
De LMDZPedia
| Ligne 11 : | Ligne 11 : | ||
ECRad also has two sub-options for the treatment of the gas phase: | ECRad also has two sub-options for the treatment of the gas phase: | ||
| − | * RRTMG (Rapid Radiative Transfer Model for GCMs) | + | * RRTMG (Rapid Radiative Transfer Model for GCMs). 16 longwave bands and 14 shortwave bands. |
* ECCKD (ECMWF correlated k-distribution scheme) | * ECCKD (ECMWF correlated k-distribution scheme) | ||
Version du 16 octobre 2023 à 15:18
There are different radiative schemes that can be used in LMDZ:
- the "legacy" (oldest) radiative scheme: available regardless of the makelmdz options used. 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 makelmdz has been run 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 makelmdz has been run 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.
- Tripleclouds : trois colonnes par maille : ciel clair, nuageux compact, nuageux intermédiaire. Le plus proche de RRTM.
- Tripleclouds 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 (Rapid Radiative Transfer Model for GCMs). 16 longwave bands and 14 shortwave bands.
- ECCKD (ECMWF correlated k-distribution scheme)
