1. Ulrich Schättler Source Code Administrator
COSMO-Model
Ulrich Schättler
Source Code Administrator

2. SMC Meeting January 2018, Offenbach
New COSMO Versions
SMC Meeting January 2018, Offenbach

3. Contents (Highlights) Results Changes
Version
Date
Contents (Highlights)
Results Changes
5.04g
reproducing "old" COSMO physics
update of TERRA
GPU port for Tiedtke convection
modified computation of HPBL
modifications to SPPT
yes no
only HPBL
only if lsppt
Modifications in TERRA
modified calculations of runoff and infiltration to avoid loosing too much soil moisture (GZ, JH)
bug fix for index accessing (by L. Schlemmer, ETHZ)
soil ice parameterization according to Schaefer and Jafarov (JH)
new option itype_trvg==3: needs additional input fields not available in COSMO (therefore not usable for COSMO)
SMC Meeting January 2018, Offenbach

4. Contents (Highlights) Results Changes
Version
Date
Contents (Highlights)
Results Changes
5.04h
changes in data assimilation
adjust computational domain for saturation adjustment in dynamics
lshallowconv_only for Tiedtke-Bechtold convection
GPU port for turbulence
yes (dep. on situation)
SMC Meeting January 2018, Offenbach

5. SMC Meeting January 2018, Offenbach
COSMO-ICON Physics
SMC Meeting January 2018, Offenbach

6. SMC Meeting January 2018, Offenbach
Hindcast: March – June 2016
COSMO Version 5.04e
SMC Meeting January 2018, Offenbach

7. Numex Experiment 482 for COSMO-D2 (new physics)
COSMO Version 5.04e
SMC Meeting January 2018, Offenbach

8. SMC Meeting January 2018, Offenbach
Conclusion
The NUMEX experiment for COSMO-D2 with full data assimiliation cycle performs worse than the hindcasts.
Problem in all tests: drying out of the soil (while different hindcast configurations / external parameters lead to different soil moistures).
Problem in NUMEX: some members of the EPS system crashed because of numerical instabilities. The few that we investigated could be cured using the former vertical diffusion in the dynamics (itype_vdif=-1).
DWD decided that there is not enough time to test the new COSMO-ICON physics before introducing COSMO-D2 in May 2018, therefore we stay with the "old physics behaviour" (for the remaining lifetime of the COSMO-Model)
we use the new blocked code
but configuration as with the old COSMO ijk-physics (including some hard-coded switches for turbulence: these are activated with loldtur=.TRUE. now)
SMC Meeting January 2018, Offenbach

9. SMC Meeting January 2018, Offenbach
In the Meantime
Drying out of the soil can also be seen in ICON, if soil moisture analysis is switched off.
Investigations lead to problems in TERRA regarding runoff and infiltration. Modifying the way these processes are treated lead to a more wet soil (implemented in 5.04g).
Nevertheless: DWD will not investigate the modified TERRA version in combination with the new COSMO-ICON physics.
Now we are testing the old ijk-physics.
SMC Meeting January 2018, Offenbach

10. Numex Experiment 536 for COSMO-D2 (old physics)
COSMO Version 5.04h
SMC Meeting January 2018, Offenbach

11. SMC Meeting January 2018, Offenbach
The Next Versions
SMC Meeting January 2018, Offenbach

12. Contents (Highlights) Results Changes
Version
Date
Contents (Highlights)
Results Changes
5.05
GPU port for nudging
GPU port for microphysics
alternative method for cold pool diffusion
modifications for Radar Forward Operator
perhaps
new output variables (MCH: radiation; DWD: echo top)
usage of boundary condition module in initialize_loop
removal of coarse radiation grid no
optional
if used
SMC Meeting January 2018, Offenbach

13. About the Coarse Radiation Grid
Not used at all in:
MCH, Italy (Bologna, COSMO-LEPS), Greece, Poland, Israel
Used, but not crucial, in:
Not yet decided:
coarse grid
full grid
Italy (Rome)
local hpc, +48h, 24x24 s s
Cray-ECMWF, +30h, 24x27 s s
Russia
CFO 02, 20x20 s s
SFO 02, 20x20 s s
Romania
2.8 km, +30h
131 m s
146 m s
DWD
COSMO-D2, +12h, 43x54+6 s s
SMC Meeting January 2018, Offenbach

14. Version 5.06: From the Working Groups
WG 1:
Radar forward operator 
WG 2:
Improvement for Bott Advection depending on results
Higher order horizontal discretizations  (available June 2017)
WG 3a:
2-moment microphysics 
SPPT (bug fixes) already in 5.04g
WG 3b:
Urban module (good results assumed; work in progress)
Mire parameterization (optional) 
SMC Meeting January 2018, Offenbach

15. SMC Meeting January 2018, Offenbach
From POMPA
Physical parameterizations: only missing
FLake, SeaIce
Tiedtke-Bechtold convection
GCL (global communication library) for MPI communication between GPUs
Still to be tackled: organizational code, diagnostics
SMC Meeting January 2018, Offenbach

16. SMC Meeting January 2018, Offenbach
How to Proceed?
Implement subversions (5.05a, 5.05b, etc.) for testing. What is included, depends on what is ready.
Checklist:
Are the results bit identical? If not, do we have test / verification results?
Is documentation available, where necessary?
For which date shall we aim with Version 5.06?
SMC Meeting January 2018, Offenbach

17. Plans for next-next COSMO-Model
From ICON developments
Prognostic sea-ice albedo parameterization
interception procedure (TERRA)
Coupling between soil and atmosphere (vegetation shading)
After implementing the COSMO-ICON Physics, we should unify again with CLM Version: COSMO 6
SMC Meeting January 2018, Offenbach

18. Thank you
very much
for your
attention