Description of the upgrade
A number of modifications were made, mostly concerning the use of satellite data:
1. a revision of the use of TOVS radiances including the simplification and improvement of bias corrections. SATEM retrievals were replaced by the use of radiances above 100 hPa while H1RS12 were introduced both over sea and land;
2. some quality control modifications with most impact on the way ERS-2 wind retrievals are handled.
Revisions were also made to the ocean albedo and to the momentum transport representation in the convection scheme. A correction was applied to computations of saturation vapour pressure with effect mainly in very cold conditions.
Implemented: 27 August 1997
Resources
ECMWF Newsletter: Please see "Influence of observations on the operational ECMWF system" in ECMWF Newsletter No. 76
Contents of this page
All IFS cycles
- Terminology for IFS testing
- 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