#newfcsystem
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This page is used only to draft changes for review prior to publishing in the Forecast User space and is accessible by ECMWF staff only. The publicly accessible page will be added at a later stage. Useful Internal links: E-suite cycle 46r1 (FD) Cycle 46r1 memo (pdf file) |
Description of upgrade
IFS Cycle 46r1 is an upgrade with many scientific contributions, including changes in data assimilation (both in the EDA and the 4DVAR), in the use of observations, and in modelling. The new cycle only includes meteorological changes; there are no technical changes, e.g. new resolutions. This upgrade does not apply to the ECMWF seasonal forecasting system or to the CAMS global forecasting system.
The page will be updated as required. It was last changed on 2231.01.2018
For a record of changes made to this page please refer to Document versions.
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| Date | Event |
|---|---|
| January 2019 | Initial announcement |
| 26 Febrary February and 07 March 2019 | Live-streamed seminar 1 |
| May 2019 | Availability of test data in dissemination Live-streamed seminar 2 |
| June 2019 | Expected date of implementation |
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For further details, read Main Contributions in data assimilation and observations.
Model
- Improvements in convection scheme (entrainment, CAPE closure, shallow convection).
- Activate LW scattering in radiation scheme.
- 3D aerosol climatology replaces 2D climatology.
- Correct scaling of dry mass flux in diffusion scheme.
- Improvement of the TL/AD of the semi-Lagrangian departure point scheme in the polar cap area.
- Fix instability in 2m temperature diagnostic related to wet tile.
- Bug fix in the computation of rain amount that could freeze when intercepted by the snow-pack.
- New physics for the wave model.
- Limit on wave spectrum for very shallow water and minimum depth set to 3m.
- ENS makes use of 50 EDA-members and inital perturbations are made exchangeable.
- ENS radiation time-step is reduced from 3 hours to 1 hour, to be consistent with HRES.
For further details, read Main Contributions in modelling
Re-forecasts
The new IFS cycle 46r1 will use the ERA5 data to initialize the re-forecasts and also use ERA5 EDA to perturb the re-forecast initial condition
Document versions
| Date | Reason for update |
|---|---|
| 2231.01.2019 | Initial version |
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