Description of the upgrade
The new cycle includes important changes to the data assimilation system and a new short-wave radiation scheme.
Implemented: 05 June 2007 |
Datasets affected
- HRES
- ENS
Resolution
Unchanged
| Horizontal | Vertical |
|---|---|
Atmospheric (unchanged)
Wave (unchanged)
| Atmospheric (unchanged)
|
Meteorological content
- Three-minimization version of 4D- Var assimilation scheme (T95/T159/T255) with improved moist linear physics (cloud and convection)
- Improved parametrization of the heterogeneous ozone chemistry
- New short-wave radiation scheme ( RRTM-SW), plus McICA cloud-radiation interaction and MODIS albedo
- Retuned ice particle
- Revised subgrid-orography scheme
- Explicit numerical treatment of convection in the moist tangent linear model used in the calculation of tropical singular vectors
Meteorological impact
- tropical troposphere shows significant improvements at all forecast ranges
- moderate but statistically significant improvements in the extra-tropical troposphere, particularly in the first four days
- at 500 hPa the ensemble-mean error is reduced
- in the tropics the spread at 850 hPa is increased, moving closer to the ensemble-mean error.
Technical content
Model ID and experiment number
- Atmospheric: 129
- Ocean wave: 116
- Limited-area ocean wave: 216
E-suite experiment number = 0034
Resources
ECMWF Newsletter: See Newsletter 112