1. Merja Tölle, Nicole Van Lipzig, Heimo Truhetz
Nesting strategies
Merja Tölle, Nicole Van Lipzig, Heimo Truhetz
Working group CRCS
Assembly 2013
Zurich, Swiss

2. 1. State the reason why you have decided to take your specific nesting strategy about nesting steps and domain size (for example own experiences, followed some recommendation, from literature, if any please add references such as presentations or publications):
Limited computational resources
Took from DWD operational weather forecast
Followed recommendation
Per requirement
Literature

3. 2. Nesting steps
3. Simulated
Region
4. Time
interval
5. Grid points
6. Time
step
7. Convection
Scheme
8. Atm
layers
9. Sim
time
ERA-Interim
->25km
->2.8km
->Europe
->Belgium
->6h
->1h
100x100
192x175
60s
20s
Tiedke
Shallow 50
IFS(25km)
->20km
->Eastern Alps
->Brandenburg
->3h
252x260
192x132
25s
1.Leapfrog 40
2007/08
May-Aug
Nov-Feb
->12km
->2km
Greater Alpine region
260x228
500x500
90s 60
Jul2006
MPI-ESM-LR
ERA-Interim 80 km
GCM 1.875°

4. 2. Nesting steps 3. Simulated Region 4. Time interval 5. Grid points
7. Convection
Scheme
8. Atm
layers
9. Sim
time
CCLM18km(ECHAM5)
->7km
->1.3km
Central Europe
Central
Germany 3h 1h
254x254
375x376
45s
12s
Tiedke
Shallow 40
ERA-Interim
or GCM of CMIP5
->50km
->12km
->3km
->1km
European
Alps
->3h
->1h
360s
100s
25s
6-8s
EC Earth
->25km
->2.8km
->Europe
->Belguim
->6h
100x100
150x150
192x175
120s
40s
Leapfrog
Runge-Kutta 32
2-3d
One week
20d
ERA-Interim 80 km
GCM 1.875°

5. 9. Model version int2lm_1.9_clm5 cosmo_090213_4.8_clm11
cclm v4.8_clm6
CCLM 4.14
cosmo_090213_4.8_clm17

6. 10. Literature for high resolution
Weisman, M. L., W. C. Skamarock and J. B. Klemp (1997). The Resolution Dependence of Explicitly Modeled Convective Systems. Mon. Wea. Rev , pp. 527– 548
Knote C, Heinemann G & Rockel B 2010 Meteorologische Zeitschrift 19(1), 011–023