Cycle 21r2 summary of changes

13 July 1999 Cy21r2 of the model, the list of important changes introduced on this occasion includes:

1. a new coupling of the physics with the dynamics;

2. a new optimal interpolation analysis of soil moisture and temperature, using the analysis of screen-level temperature and humidity introduced in March;

An article "A revised land-surface analysis scheme in the Integrated Forecasting System" from the ECMWF Newsletter No.88

3. US profilers and dropsonde data are used; radiosonde temperatures are bias corrected using information carried out in the TEMP message; ship winds are assigned to a height consistent with the information reported in WMO tables; ship humidity data are blacklisted;

4. waves slope and wind stress formulations are improved in the oceanic wave package


Cycle changes

Please note

Prior to 2006 information on cycle upgrades has been migrated from the old website to the new website "as is". The information has not been reviewed during the migration.