1. COSMO-SCM:
The SC-framework has been upgraded to COSMO_5.0 (during the visit of Ines Cerenzia) :
Various adaptions to the specific SC-code mainly due to the TRACER-structure
Some minor adaptions to the main COSMO code
Further adaptions to the specific MAKEFILE for compiling COSMO-SCM
The adaptions of the main COSMO code are within a test code ready for version 5.1
SC-runs using COSMO-version 5.0 are carried out by workers in the “renewable energy projects” at DWD, by myself and by Ines Cerenzia at ARPA-SIMC.
The future TURBDIFF-version for COSMO and ICON is being developed within this framework
Remaining work:
Specific SC-code as part of COSMO source code administration
Automatic MAKEFILE-generation
Updated documentation
Remarks:
The additional code of the SC framework is comprehensive and can’t be inspected completely
It has been designed to be a test-bed only and is not optimized with respect to performance and is purely sequential.
User support can’t be provided yet.
COSMO-SMC
Matthias Raschendorfer
May 2014

2. Release Planning for V 5.1 – test_version of UB and MR:
3D-extensions for TURBDIFF within the concept of scale separation:
TKE-advection in terms of q=SQRT(2*TKE) [lprog_tke]; done by U. Blahak
Horizontal shear production of TKE and horizontal diffusion (including TKE) at least for isotropic diffusion coefficients [l3dturb]
Consideration of a separated horizontal shear mode
itype_sher = 1 : no consideration
2 : additional TKE production by scale interaction
3 : additional horizontal mixing by large horizontal shear eddies
Adaptions of the turbulent length scale in case of grid boxes with a smaller horizontal extent compared to the surface distance [not yet tested]
All modifications can be (de)activated
First tests of the implementations by U. Blahak
Main effects are expected for higher horizontal resolution, around steep orography or within frontal zones (large horizontal gradients)
Positive impact possible for EDR-forecast (used by aviation)
Some minor modifications needed for SC runs and some bug-fixes.
COSMO-SMC
Matthias Raschendorfer
May 2014

3. Test of the TKE advection for itype turb=3 and 7 done by U. Blahak:
X-Z-cut along the 2D flow, U = 10 m/s, stable stratication (ICAO-standard atmosphere).
40 levels up to 22 Km, dX = 1.1 Km, dt = 10 s
after 2 minutes starting with the not filled TKE-box (40 m2/s2)

4. LES-run with dX = 200m, heating by 300 W/m2
Test of horizontal diffusion and TKE advection for itype turb=3 done by U. Blahak:
LES-run with dX = 200m, heating by 300 W/m2
Vertical velocity after 4 h forecast time
Left: 1D-turbulence (and no TKE-advection), Right: 3D-turbulence (and TKE-advection)

5. Release Planning for V 5.1 – current ICON-version of microphysics:
Introduction of cloud-ice sedimentation (F. Rieper, G. Zängl):
Counteracts our too persistent cirrus clouds (also in graupel-scheme) [lsedi_ice]
With an modified formulation of sticking efficiency of cloud ice to snow [lstickeff]
Modifications have been tested in ICON
Reduction of overestimated ice water content
Impact on COSMO should be positive as well
Limitation of evaporation from falling precipitation (G. Zängl):
Avoids overshoots of evaporation within a time step towards super-saturation
Removes a source of numerical instability
Modification has been tested in ICON
Improved simulation of super-cooled water and some bug-fixes (by F. Rieper)
Liquid water sub layer on top of ice cloud layer due to ice sedimentation and a reduction of freezing rate of in-cloud and below-cloud water [lsuper_coolw]
Reduction of overestimated number of ice particle as a function of time
Much improved forecast of aircraft icing (for aviation)
Has been already been tested with COSMO (based on current version of microphysics) but not with ICON and not with the graupel scheme
COSMO-SMC
Matthias Raschendorfer
May 2014

7. Common COSMO-ICON TURBDIFF:
Preparation of COSMO to be compatible with ICON version
Interface providing variables in block-data structure and
Adaptions to modified subroutine structure
Wind components on mass positions
Calculation of 3D-shear including the treatment of separated horizontal shear
Adaptions to modified initialization of turbulent variables
Introduction of surface flux densities as global model variables
Various adaptions in order to use new generalized routine for vertical diffusion
Modifications of the ICON version
Inclusion of pre-calculated horizontal shear terms
Upgrade with respect to some further modifications based on the development code within COSMO-SC (still without block data structure)
Debugging, Testing and Verification of the upcoming code
Planned for COSMO-5.2
COSMO-SMC
Matthias Raschendorfer
May 2014

8. Further improved microphysics/radiation:
Improved treatment of cirrus clouds (PhD of C. Köhler):
State of the art parameterization of ice nucleation (including homog. freezing)
Different treatment of depositional growth of cloud ice and snow
Considering ice sedimentation (already in current version)
Treating number concentration of activated ice nuclei as prognostic variable
Modifications have been tested in ICON (not yet satisfying, implementation bug?)
Reduction of overestimated ice water content
Planned for COSMO-5.2
Improved cloud radiation coupling (U. Blahak, B. Ritter)
Optical properties of hydrometeors depending on their effective radius
Including snow, graupel and rain in the radiative calculations
Effective factor to consider subgrid scale variability within clouds
Radiative properties of SGS clouds
Consolidated test version implemented in COSMO 4.22
Promising test results based on real cases
COSMO-SMC
Matthias Raschendorfer
May 2014

10. Short-term Priorities and Rlease-Planning:
MS: priority of MeteoSwiss
SP: Included in Science Plan
AL: Included in short term Action List of turbulence meeting
RD: Running Developmen
TG: To be Transferred form GME
NR: planned for Next Release
at least some aspects (NR)
contributors
Turbulence: unified TURBDIFF version ICON/COSMO
Turbulence: TKE advection
Turbulence: TKE-SV scheme
Turbulence: clean up namelist
Turbulence: clean interface between land-surface and atmosphere (flux coupling)
Microphysics: cirrus cloud improvements
Microphyiscs-Radiation coupling
Microphysics: ice-sedimentation in single-moment (graupel) scheme MS SP AL RD
(NR)
(MR, IC) MS AL NR
(UB, JF) MS SP AL
to be implemented in unified version MS AL RD NR
(MR, UB) MS NR
(MR) RD SP TG NR
(CK, UB) MS SP RD
(NR)
(UB) MS MS SP TG NR
(CK, UB)
Super-cooled water and div. bug fixes by F. Rieper NR
(CK, UB)
COSMO-SMC
Matthias Raschendorfer
Dec.2013

11. Common COSMO-ICON Physics:
Common TURBDIFF-module is being developed within the SC-framework:
A precursor of the ICON-implementation has been implemented into COSMO_5.0-SCM
Horizontal operations has been moved to the calling interface
Adaptions to TRACER-structure implemented
Outstanding:
Transfer of some development from COSMO test versions
Transition to block-data structure
Activation of the vertical diffusion procedure contained in TRUBDIFF
Transfer of some development that has taken place already in ICON
Saving the explicit surface fluxes from TURBTRAN or TERRA …
Debugging, Testing and Verification of the upcoming code
Microphysics, SSO, TERRA (ICON-code has developed):
Only interface for long-parameter-list call and block-data structure
Convection, Radiation:
Different schemes in COSMO and ICON
Common modules -> Common library: content? Code management?
COSMO-SMC
Matthias Raschendorfer
Dec.2013

12. Turbulence meeting: working-plan:
COSMO-SMC
Matthias Raschendorfer
Dec.2013

13. PT ConSAT:
COSMO-SMC
Matthias Raschendorfer
Dec.2013

14. DWD-point of view:
At this stage of the implementations, it will be most efficient, if that the work is done by the originating developer.
The work should prepare a basis for further development shared within COSMO.
The guideline of further related work is given in the current PT-Plan and it is in accordance with the SP chapters on SAT and turbulence.
Nevertheless, before starting with the physical content even in the running ConSAT, the next most urgent steps belonging to “applied research” needs to be done:
merging different developing branches within common modules for COSMO and ICON,
preparing the SC-testbed
[We already coordinated that kind of work at our November turbulence meeting.]
The coordination on WG-level is by far sufficient. By definition of future PTs along the longer-term plans, the work can be focussed onto clear tasks, which also offers FTE-level contributions.
Another administration level between that at the NWS and the WG-coordination seems not to be an advantage in this particular field, since it would call for further parts of my FTE for in principal dispensable duplication of writing plans and reporting.
Rather this would even delay progress, and I’m therefor obliged to organize the work as described.
COSMO-SMC
Matthias Raschendorfer
Dec.2013