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

SMC Meeting January 2018, Offenbach New COSMO Versions 10.04.2019 SMC Meeting January 2018, Offenbach

Contents (Highlights) Results Changes Version Date Contents (Highlights) Results Changes 5.04g 13.11.17 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) 10.04.2019 SMC Meeting January 2018, Offenbach

Contents (Highlights) Results Changes Version Date Contents (Highlights) Results Changes 5.04h 15.12.17 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) 10.04.2019 SMC Meeting January 2018, Offenbach

SMC Meeting January 2018, Offenbach COSMO-ICON Physics 10.04.2019 SMC Meeting January 2018, Offenbach

SMC Meeting January 2018, Offenbach Hindcast: March – June 2016 COSMO Version 5.04e 10.04.2019 SMC Meeting January 2018, Offenbach

Numex Experiment 482 for COSMO-D2 (new physics) COSMO Version 5.04e 10.04.2019 SMC Meeting January 2018, Offenbach

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) 10.04.2019 SMC Meeting January 2018, Offenbach

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. 10.04.2019 SMC Meeting January 2018, Offenbach

Numex Experiment 536 for COSMO-D2 (old physics) COSMO Version 5.04h 10.04.2019 SMC Meeting January 2018, Offenbach

SMC Meeting January 2018, Offenbach The Next Versions 10.04.2019 SMC Meeting January 2018, Offenbach

Contents (Highlights) Results Changes Version Date Contents (Highlights) Results Changes 5.05 02.02.18 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 10.04.2019 SMC Meeting January 2018, Offenbach

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 4795.12 s 4812.39 s Cray-ECMWF, +30h, 24x27 3334.00 s 3484.00 s Russia CFO 02, 20x20 2807.09 s 2819.47 s SFO 02, 20x20 3721.55 s 3750.23 s Romania 2.8 km, +30h 131 m 3.246 s 146 m 30.713 s DWD COSMO-D2, +12h, 43x54+6 384.03 s 393.49 s 10.04.2019 SMC Meeting January 2018, Offenbach

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)  10.04.2019 SMC Meeting January 2018, Offenbach

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 10.04.2019 SMC Meeting January 2018, Offenbach

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? 10.04.2019 SMC Meeting January 2018, Offenbach

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 10.04.2019 SMC Meeting January 2018, Offenbach

Thank you very much for your attention