- Created by Helen Setchell, last modified by Kathy Maskell on Jan 25, 2023
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.
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
Contents of this page
All IFS cycles
- Terminology for IFS testing
- Implementation of AIFS ENS v1
- Implementation of AIFS Single v1
- Implementation of IFS Cycle 49r1
- Implementation of IFS Cycle 48r1
- Implementation of IFS Cycle 47r3
- Implementation of IFS Cycle 47r2
- Implementation of IFS Cycle 47r1
- Implementation of IFS cycle 46r1
- Implementation of IFS cycle 45r1
- Implementation of Seasonal Forecast SEAS5
- Implementation of IFS cycle 43r3
- Implementation of IFS Cycle 43r1
- Implementation of IFS cycle 41r2
- Introducing the octahedral reduced Gaussian grid
- Horizontal resolution increase
- Boundary-Condition Programme ENS at 06 and 18 UTC
- Implementation of IFS Cycle 41r1
- IFS cycle upgrades pre 2015