1. Bucharest 2006 J. Steppeler (DWD)
WG2 activities 2006
Bucharest 2006
J. Steppeler (DWD)

2. WG2: List of Work Packages 2006 2. 1Priority
WG2: List of Work Packages Priority Further development of Runge Kutta Looking at pressure bias (Foerstner , Torrisi, possibly CIRA) OK Continue RK case studies ( De Morsier, Torrisi, possibly CIRA )OK Conservation (Baldauf ) OK/ Advection of moisture quantities in conservation form (Foerstner) OK Investigation of convergence (Baldauf) NOT DONE Deep valleys (Bitzer, Foerstner, Reinhard) OK Different filter options for orography (Foerstner) OK rd order in the vertical for Runge Kutta scheme OK/ Physics coupling scheme : Report of possibilities in Sept 2006 Not Done Testing of alternative fast wave scheme (Gassmann) OK De Morsier .1, Foerstner .5, Torrisi .1, Baldauf .2,

3. 2. 2 Priority. Z-coordinate (see next slide) 2. 3
2.2 Priority Z-coordinate (see next slide) Implicit integration: 3-d pilot study (Thomas, Schättler, Steppeler) Publication in print, Visit Thomas planned CP (Charney Phillips vertical staggering) version of LM with theta and pi (Exner function) as prognostic fields: (Herzog, Gassmann) OK Further development of radiative upper boundary condition: real cases (Herzog, Gassmann, De Morsier) OK LM User Seminar / Advanced Numerics Seminar (Steppeler, Baldauf) OK

4. LM_Z OK, untested Not done, no staff Only two
Version 1.4 done, overachieved
not done
OK, not complete ? OK
OK, preliminary test
Not done
OK, in print MWR
First meeting OK
Not done, for next year

5. Conclusions administrative
This may be considered to be most important, but it is really not very meaningful.
LM_RK: Rome: .1; Germany .6; Switzerland : Not done .1
LM_Z: Rome .2; Bologna .2; Greece .3; Poland .5; Germany .3; Switzerland .1; Switzerland Not done .1
The PDEs reflect in no way the importance of the work to the success of the project.

11. Verbesserte Vertikaladvektion für
dynamische Var. u, v, w, T, p‘
analytic sol.
implicit 2. order
implicit 3. order
implicit 4. order
C=1.5
80 timesteps
Idealized 1D advection test
C=2.5
48 timesteps

12. case study ‚25.06.2005, 00 UTC‘ Improved vertical advektion for
dynamic var. u, v, w, T, p‘
total precipitation sum after 18 h
with vertical advection 2. order
difference total precpitation sum after 18 h
‚vertical advection 3. order – 2. order‘

13. cold pool – problem in narrow valleys
is essentially induced by pressure gradient term
T (°C)
starting point
after 1 h
after 1 h
modified version:
pressure gradient on z-levels, if
|metric term| > |terrain follow. term|
J. Förstner, T. Reinhardt

14. All PDE delivered except Task 7 of LM_Z (.1 PDE) LM_RK:
Conclusions, Formal: PDEs delivered OK, but some WP not exactly to plan, but often useful some much above plan
All PDE delivered except Task 7 of LM_Z (.1 PDE)
LM_RK:
LM_Z: Main goal achieved, but not all work done, very convincing results of LM_Z 1.4 Report in print MWR
Implicit integration: Guest scientist Thomas CP OK
Radiative upper boundary condition: OK
LM User Seminar / Advanced Numerics Seminar OK