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Description of the upgrade
The new cycle includes significant changes to the model physics, including the convection scheme, that increase the model activity in the tropics.
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Implemented: 06 November 2007 |
Datasets affected
- HRES
- ENS
Resolution
Unchanged
| Horizontal | Vertical |
|---|---|
Atmospheric (unchanged)
Wave (unchanged)
| Atmospheric (unchanged)
|
Meteorological content
- New formulation of convective entrainment and relaxation timescale
- Reduction in free atmosphere vertical diffusion
- New soil hydrology scheme
- New radiosonde temperature and humidity bias correction
- Increase in number of radio occultation data from COSMIC
- Assimilation of AMSR-E, TMI, SSMIS window channels (clear sky)
- Assimilation of SBUV ( NOAA-17, NOAA-18) and monitoring of OMI ozone data
- Corrections to the radiation post-processing in the IFS will correct/improve the following parameters:
- 57 (UVB) Downward UV radiation at the surface
- 58 (PAR) Photosynthetically active radiation at the surface
- 59 (CAPE) Convective available potential energy
ENS
- initial perturbation amplitude reduced by 30%
- singular vectors targeted on tropical cyclones are computed with the new moist physics package in the tangent-linear and adjoint models (as used in the operational in 4D- Var since cycle 32r2).
Meteorological impact
- improved scores for the extra-tropical southern hemisphere throughout the forecast range, and for the northern hemisphere in the first half of the forecast
- substantial improvement to the lower tropospheric winds in the tropics compared to observations
- reduction in the biases of 2m temperature mainly over the Americas
- improved precipitation forecasts over Europe
ENS
- reduction of the initial perturbation amplitude resulted in a good match of spread and ensemble mean error
- probabilistic skill is generally improved at mid-latitudes
- improved reliability of the tropical cyclone strike probability forecasts
- neutral impact in the extra-tropics
- beneficial impact on probabilistic precipitation forecasts over Europe.
New and changed parameters
New parameters
Four new pressure levels in the analyses and HRES forecast runs: 600, 800, 900 and 950 hPa.
Technical content
Model ID and experiment number
- Atmospheric: 130
- Ocean wave: 116
- Limited-area ocean wave: 216
E-suite experiment number = 0035
Resources
ECMWF Newsletter: See Newsletter 113
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