Description of the upgrade
An hourly, two way coupling of the atmospheric and ocean-wave model was introduced. Predicted ocean waves now provide information to the atmospheric boundary layer.
Other modifications introduced at the same time were:
- the use of both significant and standard wind level winds, temperatures and humidities from radiosondes (geopotential is no longer used);
- the use of extra off-time data, mostly SYNOPs and DRIBUs;
- the use of 1D-Var SSM/I total column water vapour;
- extension of the use of GOES high-resolution winds to the northern extratropics;
- the use of more TOVS channels over land;
- the observation operator for 10m winds is now unified for scatterometer, DRIBU and SYNOP observations.
Implemented: 29 June 1998
Resources
ECMWF Newsletter: "Progress with wind-wave interaction" from Newsletter No.80 and "Recent improvements to the ECMWF 4D-Var data assimilation" from Newsletter No.81
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