Description of the upgrade
Cycle upgrade 47r3 will bring a significantly improved physical basis for moist processes and is necessary to facilitate future development of the Integrated Forecasting System (IFS).
The upgrade will tackle longstanding systematic model errors in clouds, precipitation and radiation across all resolutions and forecast lead times, and provide an improvement across the board. Very importantly, it will make it possible in the future for the IFS to run across a broader range of horizontal resolutions, including convection-permitting resolutions.
Implementation scheduled for 06 UTC run on 5 Oct 2021, TBC
Page updated on
#IFS47r3 #newfcsystem @ECMWF
NEWS!
IFS Cycle 47r3 content and implementation timeline announced. The new cycle will be introduced in a first webinar on
6 July 2021 at 8:00 UTC: Join the webinar on Zoom
Timeline of the implementation
Meteorological content
Meteorological impact
A summary of the meteorological impact will be provided in July.
New and changed parameters
New parameters
The table contains the list of parameters expected to be available with the model implementation. They will be available as part of the test data.
Param ID | Short Name | Name | units | Component & type | GRIB edition | Level type | MARS | Added to Catalogue | ecCharts | Dissemination |
---|---|---|---|---|---|---|---|---|---|---|
228045 | trpp | Tropopause pressure | Pa | HRES FC | 2 | sfc | TBD | TBC | ||
228020 | degm10l | -10 degrees C isothermal level (atm) | m | HRES/ENS FC | 1 | sfc | TBD | TBC | ||
228131 | u10n | Neutral wind at 10 m u-component | m s-1 | ENS FC | 1 | sfc | TBD | TBC | ||
228132 | v10n | Neutral wind at 10 m v-component | m s-1 | ENS FC | 1 | sfc | TBD | TBC | ||
228231 | mlcape50 | Mixed-layer CAPE in the lowest 50 hPa | J kg-1 | HRES/ENS FC | 2 | sfc | TBD | TBC | ||
228232 | mlcin50 | Mixed-layer CIN in the lowest 50 hPa | J kg-1 | HRES/ENS FC | 2 | sfc | TBD | TBC | ||
228233 | mlcape100 | Mixed-layer CAPE in the lowest 100 hPa | J kg-1 | HRES/ENS FC | 2 | sfc | TBD | TBC | ||
228234 | mlcin100 | Mixed-layer CIN in the lowest 100 hPa | J kg-1 | HRES/ENS FC | 2 | sfc | TBD | TBC | ||
228235 | mucape | Most-unstable CAPE | J kg-1 | HRES/ENS FC | 2 | sfc | TBC | |||
228237 | mudlp | Departure level of the most unstable parcel expressed as Pressure | Pa | HRES/ENS FC | 2 | sfc | TBD | TBC | ||
260290 | cat | Clear air turbulence (CAT) | m2/3 s-1 | HRES FC | 2 | ml | TBD | TBC |
Technical content
Changes to GRIB encoding
The GRIB model identifiers (generating process identification number) for cycle 47r3 will be changed as follows:
GRIB 1 Section 1 Octets | GRIB 2 Section 4 Octets | eccodes key | Component | Model identifier | |
---|---|---|---|---|---|
47r2 | 47r3 | ||||
6 | 14 | generatingProcessIdentifier | Atmospheric model | 152 | 153 |
6 | 14 | generatingProcessIdentifier | Ocean wave model | 117 | 118 |
Software
To handle all output from Cycle 47r3 eccodes 2.22.0 will be required. The relevant versions of Magics and Metview will be announced closer to the availability of test data.
Availability of 47r3 test data
The release candidate test data and products, which are expected to be made available in September 2021, will be generated daily, shortly behind operational high resolution and ensemble runs and based on the operational dissemination requirements. The availability of the test data does not follow any strict schedule.
Resources
Bechtold, P., M. Bramberger, A. Dörnbrack, M. Leutbecher, L. Isaksen, 2021: Forecasting Clear Air Turbulence (CAT). ECMWF Newsletter, No 168.
David Duncan et al., Assimilation of AMSU-A in all-sky conditions. EUMETSAT/ECMWF Fellowship Programme Research Report, in preparation, 2021
- All Physics developments and all new Grib parameters (algorithms) described in the IFS scientific documentation