1. aLMo from GME and IFS boundary conditions: A comparison
Marco Arpagaus & Francis Schubiger
COSMO WG4/WG5 workshop, May 2003

2. GME vs IFS: an example (forecast of 7.3.2003 00 UTC)
aLMo with GME
aLMo with IFS
COSMO WG4/WG5 workshop, May 2003
24h precipitation sum ( h)

3. GME vs IFS: Subjective verification by forecasters
COSMO WG4/WG5 workshop, May 2003

4. Configuration Model configuration used: aLMo; March – May 2003
GME/OPR: GME boundary conditions, both for the assimilation cycle and the forecast run.
IFS: IFS boundary conditions, both for the assimilation cycle and the forecast run. Frames for lateral boundary conditions, full IFS for surface fields (snow cover from LM-DWD); no upper boundary.
Bugs for IFS runs:
Soil moisture a factor of 1000 too small (INT2LM).
Surface fields from frames (?!) rather than full IFS.
Different LM versions (GME: 2.17 / 3.2; IFS: 2.19 / 3.2).
COSMO WG4/WG5 workshop, May 2003

5. soil moisture … COSMO WG4/WG5 workshop, May 2003

6. soil temperature … COSMO WG4/WG5 workshop, May 2003

7. relative humidity: +00h COSMO WG4/WG5 workshop, May 2003

8. relative humidity: +48h COSMO WG4/WG5 workshop, May 2003

9. total cloud cover for March/April: daily cycle
IFS: ~1 octa lower total cloud cover
COSMO WG4/WG5 workshop, May 2003
ANETZ
OPR
IFS
LM-DWD

10. temperature: +00h COSMO WG4/WG5 workshop, May 2003

11. temperature: +48h COSMO WG4/WG5 workshop, May 2003

12. geopotential: +48h COSMO WG4/WG5 workshop, May 2003

13. wind direction: +48h COSMO WG4/WG5 workshop, May 2003

14. wind speed: +48h COSMO WG4/WG5 workshop, May 2003

15. Td2m for March/April: daily cycle
IFS: drying out during the forecast
COSMO WG4/WG5 workshop, May 2003
ANETZ
OPR
IFS
LM-DWD

16. Precipitation for March/April: daily cycle
IFS: only 50% after 48 hrs as compared to GME
COSMO WG4/WG5 workshop, May 2003
ANETZ
OPR
IFS
LM-DWD

17. Precipitation for March/April: daily cycle
COSMO WG4/WG5 workshop, May 2003
ANETZ
OPR
IFS
LM-DWD

18. Summary
IFS results for mean error unclear due to (massive) bugs in the experimental setup.
Upper Air and precipitation: Clear improvement of IFS runs as compared to GME runs concerning day-to-day variations of the errors, i.e., the STD.
Subjective verification shows clear improvement of IFS as compared to GME (precipitation only), despite the major bugs …
New verification as soon as some statistics has been acquired with a hopefully bug-free IFS setup …
COSMO WG4/WG5 workshop, May 2003