COSMO Steering Committee Meeting 9-10 September 2019, Rome, Italy

1. COSMO Steering Committee Meeting 9-10 September 2019, Rome, Italy SPM Slides (dmitrii.mironov@dwd.de) COSMO STC Meeting, 9-10 September 2019, Rome, Italy

2. 4. COSMO workflow and role of SMC for ICON-NWP developments With the advent of ICON • the COSMO consortium and the CLM community no longer have full control over the source code of their model, • efficient coordination of efforts between COSMO and CLM and the other members of the ICON community is required, and • the flow of information between the ICON partners, the COSMO consortium and the CLM community is vitally important. A proposal-type document “Adaptation of the COSMO SMC when transiting to the ICON model” is drafted by the SMC. • It is being further extended and modified • Discussion at the SMC meeting 12-13 September 2019 • Final version should be ready after GM 2019

3. 4. COSMO workflow and role of SMC for ICON-NWP developments (cont’d) Extensive discussion of the workflow at the SMC level and between COSMO and the ICON partners took place Decision is to have the ICON Git repositories with the “icon-cosmo-master” branch Current version of the “Adaptation of SMC” document here

4. 6. Possible revision/extension of COSMO science plan • Two versions of COSMO Science Plane released since 2010, version 2 did not improve version 1 in many respects • Many declared goals are not achieved, a number of tasks planned are not fulfilled • No reason to make further plans as „old“ plans are not executed • Difficult, if possible at all, to make concrete and comprehensive plans until • Some experience with ICON-LAM is gained • Organizational, management and legal issues are (to a large extent) resolved

5. 7. New COSMO model releases • 7.1. New developments in COSMO 5.5x/5.6x/INT2LM • 7.2. Plans for COSMO Version 6.0

6. SCA Reports fortheCOSMO-Model and INT2LM Ulrich Schättler, Daniel Rieger Source Code Administrators

7. COSMO Versions implemented in the last Year • 5.05b (14.12.18) • Finalizeportto GPU (LHN, Nudging, climatemode, FLake) • 5.06 (27.02.19) • Fixes torun in singleprecision (TERRA, interfacesto RTTOV) • Implementation ofmireparameterization • New featuresfor Latent HeatNudging • New wind gusttuning (by MCH) • 5.06a (21.05.19) • Implementation ofskintemperatureformulation in TERRA • Modificationstoturbulencescheme due tounificationwith ICON (same codenow in COSMO and ICON) COSMO General Meeting 2019, Rome, Italy

8. COSMO Versions implemented in the last Year • 5.06b (tobeexpected: 20.09.19) • Revisedcloudradiationcoupling (T2RC2) (withifdef CLOUDRAD) • Further GPU optimizations (CLAW forgraupel; asynccopytoandfrom block structure) • Running COSMO-LEPS in GRIB 2 withnewlocalsection 28 • Interpolation to z-levels aboveground • Additional packingfor GRIB 2 (grid_ccsds, grid_jpeg, grid_png) • Option towriterestartfiles in NetCDF (from CLM) • (still ongoingwork in) Data Assimilation • Soilandsurfaceschemes: alignmentwith ICON (similartoTurbulence) COSMO General Meeting 2019, Rome, Italy

9. INT2LM Version implemented in the last Year • INT2LM 2.06 (24.05.19) • New externalparameterfieldsforslopeoforography (S_ORO) andskinconductivity (SKC) • Refactoringlockfilemechanism • Interpolation ofhhl_intohhl_gl (insteadofrecomputing) • Deactivate computationofcontrol geopotential (withlcontrol_fi=.FALSE.) • IntroducedNetCDF4 as optional outputformat (ylm_form_write = 'nc-4') • INT2LM 2.06a (comingsoon) • Running COSMO-LEPS in GRIB 2 • ModificationsforMESSy COSMO General Meeting 2019, Rome, Italy

10. Test Suite Results and Docu COSMO 5.06 and INT2LM 2.06 are not yet distributed Because the results from the NWP Test Suite are not yet available! Breaking news: draft report submitted on 5 September 2019, all in all v5.06 passed the test Documentation update: - COSMO User Guide for 5.06 uploaded - INT2LM User Guide for 2.06 uploaded - "Model Output and Data Formats for I/O“ uploaded COSMO General Meeting 2019, Rome, Italy

11. COSMO-ICON Physics COSMO General Meeting 2019, Rome, Italy

12. 2 yearsago: Technicallymodified COSMO code will bebrougth back to ICON (Q4/2017) COSMO General Meeting 2019, Rome, Italy

13. Status (in termsofsourcecode) COSMO General Meeting 2019, Rome, Italy

14. Weaim at: COSMO General Meeting 2019, Rome, Italy

15. Status of COSMO-ICON Physics • 2 yearsago: Technicallymodified COSMO code will bebroughtback to ICON (Q4/2017) • Whathasbeenunifieduptonow: • TurbulenceScheme (Q1/2019): hadtofightwith a Cray compilerbug • Soilandsurfaceschemes: TERRA, FLake, SeaIce (last Monday)! • Whatwe will try in Q4/2019: • Microphysics • SSO scheme • Tiedtke-Bechtold COSMO General Meeting 2019, Rome, Italy

16. Status of COSMO-ICON Physics II Advantages ofthisunification: GPU codeisbroughtto ICON Developers havethe same modules in COSMO and ICON Note: There still are (will be) smalldifferencesbetween COSMO and ICON (youcanviewwith a "diff") A furtherunificationand/orsynchronizationis NOT planned. Code candivergenow, whendevelopmentswithin ICON aregoing on COSMO General Meeting 2019, Rome, Italy

17. Plans forthe Next Versions COSMO General Meeting 2019, Rome, Italy

18. throughgithub not throughgithub ? ? ? ? COSMO General Meeting 2019, Rome, Italy

19. (*) Some Comments • SAINT: • First implementationisusing a TERRA versionmodifiedby Matthias Raschendorferforimplicittreatmentofheatconductionequation • This versionhasbeenupdatedlatelyby Matthias fortreatmentofmultisnowlevels • Pitfall: Do not knowwhen Matthias versionof TERRA will beimplementedoperationally • CLM: Unificationhasstarted: • Restart Files in NetCDF: alreadyimplemented • Discussionsabout additional diagnosticsstarted (new GRIB fields, but also new "leveltypes") • Severalbug fixes andtechnicalmodificationsalreadyimplementedearlier • MESSy: there will also be an update fromtheMESSy Community COSMO General Meeting 2019, Rome, Italy

20. 7. New COSMO model releases (cont’d) Version 6.0, a unified version for NWP and climate modelling, is going to be the latest release of the COSMO model The release of 6.0 is expected in December 2019 (optimistic scenario) or in March 2020 (more realistic scenario) Beyond that point in time • the COSMO code is frozen, • only maintenance is provided (incl. bug fixes), • the current SCA (Uli Schättler) will take care of ICON-LAM These points must be taken into account as future work within COSMO is planned (when drafting new PPs or PTs, etc.)

21. 14. New/potential PPs and PTs • 14.1. WG4 and WG5, AWARE • 14.2. WG3b, AEVUS2 • 14.3. WG3a, CAIIR

22. PT AEVUS2 (WG3b) Title: analysis and evaluation of TERRA_URB scheme 2 Leader: Paola Mercogliano (CIRA) Aim: Consolidate the implementation of the TERRA_URB scheme in the COSMO model, draft a new PT or PP aiming at transferring these developments into the ICON model. Duration (start and end dates): September 2019 – August 2020 FTEs: 1.1 (COSMO) + 0.6 (external partners) Participants: CIRA, ARPA-Piemonte, RHM, DWD, Ruhr University of Bochum, Flemish Institute for Technological Research, Politecnico di Torino Status:decision is expected on 10 September 2019 (STC meeting in Rome) The PT proposal was comprehensively and very vividly discussed at the SMC level.

23. PT AEVUS2 (cont’d) • NB: PT AEVUS2 is very much in line with the COSMO strategy as it appropriately accounts for specific features (and the associated difficulties!) of the transition period, viz., • the reduced rate of development of the COSMO model and its limited life expectancy, and • the contribution to the development of the ICON model into which the consortium is getting increasingly involved.

24. PP AWARE (WG4 and WG5) Title: Appraisal of "Challenging WeAther" FoREcasts Leader: Flora Gofa (HNMS) and Anastasia Bundel (RHM) Aim: to try out a number of forecast methods and evaluation approaches that are linked to high impact weather (not necessarily considered extreme to all users) and to provide COSMO Community with an overview and recommendations as to how Challenging Weather/High Impact Weather situations should be handled. Duration (start and end dates): September 2019 – August 2021 FTEs: 4.15 Participants: HNMS, RHM, ARPAE-SIMC, DWD, IMGW-PIB, MCH, NMA Status: approved by the SMC, final decision is expected on 10 September 2019 (STC meeting in Rome) Note: PP addresses cross-cutting issues, joint effort of WG4 and WG5 with the contribution from WG7

25. PP CAIIR (WG3a) Title: Clouds and Aerosols Improvements in ICON Radiation Scheme Leader: Harel Muskatel (IMS) Aim: to address various issues regarding cloud optics, aerosols-radiation interactions, aerosols-cloud interactions and shallow convection topics with the aim to further improve the ecRAD radiation parameterization scheme recently implemented into ICON; comprehensive testing of the new code will be performed, results for several locations will be compared with observational data. Duration (start and end dates): March 2020 – February 2022 FTEs: 5.95 Participants: IMS, DWD, RHM Status: the PP proposal is discussed by the SMC, STC decision is due in March 2020 NB: beneficial for ICON development [i.a. results of PP T2(RC)2 will be transferred to ecRAD in ICON]; PP T2(RC)2 is extended until March 2020

26. Extension of PP EX-CELO (WG2) and PP CEL-ACCEL (WG6) Titles: “Extension of COSMO-EULAG operationalization” and “COSMO-EULAG on accelerators” Leader: Zbigniew Piotrowski (IMGW) Duration (start and end dates): March 2017 – September 2019, extension until March 2020 Reason for extension: PPs were delayed due to unavailability of human resources, the project teams should finish the work planned FTEs: no extra FTEs Participants: IMGW (EX-CELO), IMGW and MCH (CEL-ACCEL) Status: extension of both PPs approved by the STC 6 September 2019, work in progress

27. Extension of PPs EX-CELO and CEL-ACCEL (cont’d) NB: future contributions (beyond September 2019, beyond March 2020 for EX-CELO and CEL-ACCEL participants) of the EULAG team to the ICON-LAM development, testing, performance analysis, etc., is being extensively discussed. Suggestions are welcome!

28. 15. Overview of the current status of WGs, PPs and PTs • 15.1. WG1, KENDA-O • 15.2. WG2, EX-CELO, CCE • 15.3. WG3a, T2(RC)2, ConSAT4 • 15.4. WG3b, CALMO-MAX, AEVUS, SAINT • 15.5. WG4, current activities • 15.6. WG5, CARMA • 15.7. WG6, CEL-ACCEL, IMPACT, SPRT • 15.8. WG7, APSU

29. 15.1. WG1, KENDA-O • Christoph Schraff

30. Status Report for KENDA-O (+ WG1) • Task 1: further development of LETKF scheme (conventional obs) • DWD: comparison 3-D vs. 4-D LETKF: 3-D is worse but better than expected •  3-D EnVar might be a viable option in the future • (to replace deterministic LETKF analysis) • MCH: regional static B matrix: scientific problems (formulation did not work) • now trying an alternative formulation (to compute velocity potential, streamfunct.) •  task is important for future option of regional 3DVar • HMC: technique to estimate (additive + mulitplicative) model errors • by using COSMO-2.2km (as a model) vs. COSMO-0.22km • (as the 'truth', tendencies started at the same point in phase space) • shows problems (spin-up)  method will probably not work • (however, this is not critical for the KENDA project as a whole) • Task 3: soil moisture analysis using satellite SM data: COMET fellowship ended • (no clear benefit yet, will continue tests in parallel suite, with little (!) FTE) • (however, this is not critical for the KENDA project as a whole)

31. Status Report for KENDA-O (+ WG1) • Task 2: extended use of observations: ongoing • radar radial velocity: data quality issues that have caused negative results in • pre-operational test are addressed by adjusting the obs errors •  negative impacts eliminated, • now neutral to positive impact, esp. in convective periods •  will probably re-introduce in pre-operational suite soon • radar reflectivity Z: radar Z in LETKF beats LHN in tests at ARPAE, • operational introduction planned in 2020; • DWD: evaluations with ICON-LAM, and tests soon • GPS STD / ZTD: consistent small positive impact; • technical work towards operationalisation • SEVIRI IR WV: clear-sky data: small benefit in upper-tropospheric humidity; • delay for all-sky (cloudy) data; further work with ICON-LAM • screen-level obs: project since 03/19 at DWD: work on bias correction; • assimilation experiments with ICON-LAM in 2020 • various at MCH: first test cases or implementation ongoing: meteo drones, • Raman lidar, Doppler wind lidars, MW radiometer

32. Status Report for KENDA-O (+ WG1) • Task 4: adaptation to ICON-LAM (DWD): progressing well • technical implementation work (really a lot !!) of whole system • (LETKF; snow / SST analyses; ensemble perturbations of soil moisture, SST; new obs operators; latent heat nudging (LHN), nudging of soil moisture, …) • in BACY experimentation script environment (basically) finished; • observation operators implemented in ICON for online LEKTF • LETKF and model settings (e.g. IAU, upper-boundary relaxation, ..) adapted • LHN adapted to ICON-LAM, works sufficiently well in summer (convection), • needs further evaluation / tuning for winter • experiments (MEC-based LETKF): ICON-DE verifies better than COSMO-DE • (14-day summer convective period, with or w/o LHN; 2-week winter period w/o LHN: • upper-air T + wind better, T2M, RH2M, 10-m wind, much better; precip similar) • first extended experiments with 4-D online LETKF for ICON-D2 started • pre-operational suite ICON-D2 with KENDA starting Oct. 2019 • towards 3DVar / EnVar option (for deterministic run): • preliminary version of MEC-based 3DVAR + EnVar exists • COSMO obs operators in DACE + TL/Adjointt.b.d. (upcoming COSMO year) • later on: testing (regional B-matrix from MeteoSwiss project needed!)

33. 15.2. WG2, EX-CELLO, CCE • Michael Baldauf

34. 15.2. WG2 (cont’d) • PT CCE (Damian Wojcik) • Runs until: Sep 2019 • Info at COSMO web: OK (PT plan of 07.08.2018 is available) • FTEs: OK (but please check the FTE tables, e.g. 0.35 FTE for sub-task 7.3 is missing) • COSMO-EULAG code received (incl. documentation by M. Ziemanski )  will be included in official COSMO 5.6x (Uli S.: starting in Oct. 2019) • plenary final report given at the COSMO-GM 2019

35. PT CCE • PT leader: Damian Wójcik • Highlights: • MPDATA advection for TKE implemented • Zero-gradient BC for qr, qs, qg and exact restart implemented • Optimum configuration of advection scheme implemented • COSMO-EULAG works semi-operationally in IMGW-PIB since winter 2019 with nudging and with competitive verification scores • COSMO-EULAG code delivered and ready for implementation into COSMO 5.6 • Documentation (author: M. Ziemiański) is available • Future work may involve comparison of COSMO-EULAG and ICON-LAM for high spatial resolutions • Future work may also follow ECMWF developments improving computational efficiency (e.g. split-advection, varying time step)​

36. Improved vertical discretization in ICON D. Reinert (DWD) • Explore a more advanced vertical discretization for , v, and  • Replace the 2nd order (linear) by 3rd order operators based on reconstructed parabolic splines (Zerroukat et al., 2006) • similarity of the (almost) converged solution at 50m suggests that the 3rd order operators are implemented correctly. • Unfortunately, only small improvements in simulation quality (if any) are noticeable (see e.g. middle rotor at Δx=Δz=200m

37. DiscontinouousGalerkin (DG) Discretizationasa potential newdynamicalcorefor ICON • DG: conservationofmass, tracermass, momentum (andenergy),arbitrarily high approximationorderpossible (=beyond 2nd order!),highlyscalable, arbitraryunstructuredgridsusable,however: efficiencyisthequestionmark… • 2-dim. toymodeliscurrentlyunderdevelopmenttoinvestigatebasicpropertiesofthe DG approachanditsusabilityfor global/regionalmodelingfor NWP andclimateapplications • HEVI approachfor Euler equations was developed • a methodtosolveshallow-waterequations on thesphereisready • Further milestones (forthenextyears!) • developmentof a 3-dim. prototype (relativelycloseto ICON) • decisionaboutapproximationorder (horiz., vertical, temporal)vs. gridmeshsize • … M. Baldauf (DWD)

38. Test case: fallingcoldbubble (Straka et al. 1993) Comparison explicit vs. HEVI scheme DG HEVI DG explicit 2nd order 3rd order M. Baldauf (DWD)

39. How to bring DG on the sphere … relative vorticity Barotropic instability test for shallow-water equations Galewsky et al. (2004) 4th order DG scheme without additional diffusion dx~67 km, dt=15 sec. FMS-SWM (Geophys. Fl. Dyn. Lab.) without additional diffusion dx~60 km (T341), dt=30 sec. Fig. 4 from Galewsky et al. (2004)

40. 15.3. WG3a, T2(RC)2, ConSAT • Matthias Raschendorfer

41. T2(RC)2 PPL: Harel Muskatel (IMS) • Work on code finished • new routine CLOUDRAD merged with latest COSMO version • possibly part of next official COSMO release • Results of the current PP: • New derivation of optical properties: including large water droplets and ice particles up to size of snowflakes -> introduced in COSMO (Ritter-Geleyn) and ICON (RRTM) • Implementation of MACv2 aerosols climatology • Implementation of prognostic ICON-ART dust and prognostic CAMS aerosols -> also as input for water and ice nucleation processes • New parameterization of water droplet effective radius, including a revised formulation of the sub-grid cloud effect • Run-time optimisations like Monte-Carlo Spectral Integration (MCSI) • New code tested and tuned against ground based and satellite data -> positive results with respect to radiation fluxes and T2m. • Project extension -> Feb. 2020: further testing and documentation

42. T2(RC)2 • New PPCAIIR: Clouds and Aerosols Improvements in ICON Radiation Harel Muskatel (PPL), Pavel Khain, Daniel Rieger, Alon Shtivelman, Alexei Poliukhov, Natalia Chubarova, Marina Shatunova, Julia Khlestova, Gdali Rivin, Uli Blahak, Barabara Fay • Mar. 2020 -> Feb 2022 • Update of the new ecRAD-RRTM in ICON with new development of T2(RC)2 • Connection of ICON with new aerosol-data similar as done for COSMO: Tanre(1983) or Tegen (1997) -> CAMS prognostic aerosols or ICON-ART or Mac-v2 climatology (Kinne 2013) or simplified 2D-advection of aerosols (G. Zängl) • New aerosol data not only for optical properties but also as condensation nuclei for microphysics (according Segal&Khain) • Verification by means of observations at Moscow State University MetObs and Lindenberg • Investigation of the new stochastic shallow-convection parameterization (Sakradzija et al. 2016) being present in ICON-> sub-grid variability of microphysical rates, precipitation from shallow convection

43. ConSAT: Status / Recent development (s. also WG3a development-page) • ConSAT-tasks delayed due to illness and temporal shift of priorities • ICON development-branch of MR with further developed Surface Coupling: TURBDIFF (further implementation of STIC with respect to near surface processes): • Optional new parameterization of Circulation-term as kata- and ana-batic near-surface circulation dependent on current SSO-parameters (thermal SSO contribution). • More realistic SAT at strong topographic inhomogeneity (mountainous regions); more testing required TURBTRAN/TERRA (improving the physical, conceptual and numerical description of SAT: • Revised TERRA with (partly optional) implicit treatment of surface temperatures (Tsf/Tsn) • Coupled implicit system of linearized heat equations for: the partial snow-free surface, the partial snow-covered surface (including the snow pack) and the soil below. • Extensive adaptation of code that was based on an explicit treatment of Tsf/Tsn by various limitations and explicit restrictions all over the code, including: • TURBTRAN (Tsf/Tsn-dependency of atmospheric transfer resistances) • interfaces and treatment of dynamic snow tiles • empirical extensions related to surface processes (implemented by G. Zängl) • Recent extension towards an implicitly coupled multi-layer (ml) heat-equation for snow: reducible to the single-layer treatment and usable for new ml snow-hydrology with individual layering for each grid point and time step (as being implemented through PT SAINT). • a) No time-step oscillations of Tsf/Tsn (even without a flux limiter); • b) Includes already the thermal part of an adapted implementation of a ml snow scheme; • c) Includes necessary preparation for the physical description of a roughness cover (canopy)

44. ConSAT <-> PT SAINT • Short-term aim: Providing a configuration of the new ICON-code that recovers the now operational results as far as possible. • With regard to current tests, this aim seems already be reached. • But further tests are still pending. • Next steps: • A new ‘commit’ of this code and a ‘merge’ with the official development branch of ICON by US + MR: next few weeks • This code will already be formally adapted to the coding of TERRA, TURBTRAN and TURBDIFF in the recent COSMO version and can just be copied to COSMO. • The code contains the implicit formulation of surface processes including the implicitly coupled ml heat-equation for snow. • Transferring the CALL of multi-layer snow hydrology (based on SNOWPACK) into this version within the framework of COSMO by SaschaBellair (SB) + US. • Related additional code in TERRA should be active only for COSMO via IFDEF. • Connection of this further extended TERRA with a child branch of MR’s development branch in ICON, where it can be ‘merged’ with possible adaptations resulting from MR’s tests in order to go back to SB’s development branch in COSMO thereafter. • Full implementation of the ml snow-hydrology in all modules of COSMO and (later also of) ICON.

45. ConSAT <-> implicit TERRA and canopy treatment in ICON • Short term aim: It is planned to have MR’s development code in the official development branch as soon as testing is finalized, proving that the code can be configured so as to provide similar results as the operational code: expected by the end of this year. • For that purpose, possibly some parts of the whole development need to be switched off intermediately until they are ready for operations (in terms of improving the verification scores). • The related TERRA code will also be used in COSMO and contains the code for the new ml snow treatment, which, however, is deactivated until its full implementation is ready. • Possibly, the so far operational code remains as an intermediate option as a fall back and in order to run the current ml snow scheme for comparison. • Next steps: • Extension of the implicit treatment to phase transitions liquid<->solid also with regard to precipitation (including interception of frozen water), soil water and snow. • Extension of the included skin-layer formulation of the snow-free surface towards the treatment of a full semi-transparent canopy-layer (consisting of massive roughness elements) based on a proto-type that is already present in an older test-version of TERRA in COSMO, and which already showed an almost perfect mean diurnal cycle of Td_2m for a summer day. • As an intermediate option, the so far implemented real skin-layer resistance of the soil can already now be substituted by a parameterized virtual resistance, as Jan-Peter Schulz is currently dealing with.

46. 15.4. WG3b, CALMO-MAX, AEVUS, SAINT • Jean-Marie Bettems

47. PP CALMO-MAX, 06.2017 – 09.2020A. Voudouri / HNMS (PPL) CALMO methodologyisrecognized as a relevant approach • CALMO has 2 publishedpapers in refereedpapers(Atm. Research) • Call for contribution to a special ‘Atmosphere’ issue "Evaluation and Optimization of Atmospheric Numerical Models" • Similarresearch by Duan, Q. et al. 2017., BAMS • Used at ETHZ for climaterun calibration (new proposal in preparation) • Is beingapplied at B-TU (calibration of COSMO with new dycore, A.Will)

48. PP CALMO-MAX, 06.2017 – 09.2020A. Voudouri / HNMS (PPL) • A one year extension has been granted, 09.2019-09.2020, to fulfill CALMO-MAX goals associated with the optimization of the methodology and the definition of a standard procedure on model parameter documentation. • COSMO-1 calibration still not fullydone(meta-model very slow at IMS, now running at B-TU) • Calibration on a differenttargetdomainpending • Mondaymorning session dedicated to CALMO-MAX

49. PT TERRA Nova, 09.2016 – 02.2019Y. Ziv / IMS (PTL), V. Bessenbecher / ETHZ • Compare different recentversionsandconfigurationsofTERRA, on different targetdomains • Compare COSMO-TERRAwith COSMO-CLM (Community Land Model), MSc ETHZ

50. PT TERRA Nova, 09.2016 – 02.2019Y. Ziv / IMS (PTL), V. Bessenbecher / ETHZ • Project isfinished • Final reportavailableon COSMO web site(http://www.cosmo-model.org/content/tasks/workGroups/wg3b/docs/Priority_Task_TERRA_Nova_Final_Report.pdf,http://www.cosmo-model.org/content/tasks/workGroups/wg3b/docs/MasterThesis_TERRA_CLM_Report.pdf ) • Testedconfigurations • 2 models(COSMO-TERRA, COSMO-CLM) • 3 domains(Central Eu, Eastern Med, North-Western Ru) • 4 configurations(v5.0, v5.05 conservative / advance& oldturb / advanced & newturb) • Used resources • 1.0 FTE • 7 COSMO contributors + 3 colleagues from ETH Zurich (COSMO-CLM2 community) • IMS, RHM, MCH, DWD, ETHZ • 24 years of weather simulation