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Implemented: 10 March 2009 |
Datasets affected
- HRES
- ENS
Resolution
Unchanged
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Atmospheric (unchanged)
Wave (unchanged)
| Atmospheric (unchanged)
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Meteorological content
- Revised snow scheme including a diagnostic liquid water storage and a new density formulation
- Revised ozone chemistry
- Active assimilation of IASI humidity channels and consistent use of AIRS and IASI humidity channels.
- Activate all-sky 4D-VAR assimilation of microwave imagers
- Increase of the weight to GPS radio occultation data above 26 km, and use of the data up to 50 km
- Various satellite-related modifications, including activation of version 9 of the radiative transfer software package RTTOV-9 (developed by NWP-SAF) and revised HIRS cloud detection
- TL/AD longwave radiation (removal of the neural network), optimization of the non-linear code for simplified longwave radiation and optimization (NL, TL, AD) of the shortwave radiation scheme
- Extend the domain of the wave model from 81 º to 90 º North
- Use of ERA-interim analyses for the EFI reforecasts
Meteorological impact
Overall the new cycle is neutral in terms of verification scores for both hemispheres and the tropics.
- Improvements to 2m temperature bias and slightly better performance for recent tropical cyclones in both position and intensity.
- Synoptic performance is generally similar to current operations.
- Impact on EFI from the change to using ERA-interim analyses for its reforecasts is not substantial.
New and changed parameters
Changes to existing parameters
Technical content
Model ID and experiment number
- Atmospheric: 134
- Ocean wave: 119
- Limited-area ocean wave: 219
E-suite experiment number = 004242
Resources
ECMWF Newsletter: See Newsletter 121
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