1. The LM Climate Mode (CLM) and the Leapfrog Schemeor A.Will 1, U.Böhm 3, A.Block 1, K.Keuler 1, B.Rockel 2, M.Baldauf 4, A.Gaßmann 6, H.-J.Herzog 4, and U.Schättler 4 1 Brandenburg Technical University (BTU), Cottbus, Germany 2 GKSS Research Center Geesthacht, Geesthacht, Germany 3 Potsdam Institute for Climate Impact Research (PIK), Potsdam, Germany 4 German Weather Service (DWD), Offenbach, Germany, 6 University of Bonn, Germany The LM Climate Mode (CLM) and the Leapfrog Schemeor the other way to A.Will 1, U.Böhm 3, A.Block 1, K.Keuler 1, B.Rockel 2, M.Baldauf 4, A.Gaßmann 6, H.-J.Herzog 4, and U.Schättler 4 1 Brandenburg Technical University (BTU), Cottbus, Germany 2 GKSS Research Center Geesthacht, Geesthacht, Germany 3 Potsdam Institute for Climate Impact Research (PIK), Potsdam, Germany 4 German Weather Service (DWD), Offenbach, Germany, 6 University of Bonn, Germany Presented at the 8thGeneral Meeting

2. Developed by the CLM-Community in cooperation with the German weather service PhenomenonModel PhysicsOutlook Model run configuration: CLM_2.4.8 -> www.clm-community.eu CLM_2.4.8 -> www.clm-community.euwww.clm-community.eu and LM_3.19 and LM_3.19 Model domain: Model domain: EURope (193 x 217)EURope (193 x 217) Extended EURope (256x271)Extended EURope (256x271) LMELME Data: Data: ERA40ERA40 GMEGME ECHAM5+OPYCECHAM5+OPYC Dx = 18km Dx = 18km Dt := 90 s for leapfrog Dt := 90 s for leapfrog TERRA_MLβ TERRA_MLβ 10 Layers10 Layers z_1=1cm, z_10=11.5mz_1=1cm, z_10=11.5m Dts = 30 s Dts = 30 s

3. Developed by the CLM-Community in cooperation with the German weather service PhenomenonModel PhysicsOutlook TOT_PREC + ∆ v, mean July 60, ECHAM5 DT=90, DX=0.165 Developed by the CLM-Community in cooperation with the German weather service Film: TOT_PREC+PP TOT_PREC+PP

4. Developed by the CLM-Community in cooperation with the German weather service PhenomenonModel PhysicsOutlook Variation of Configuration DXoriginal Vert. Resol. nestingsponge 0.165Shower??? 0.44???? Domain size ???? CFL: V < 160 km/h for DT=90

5. Developed by the CLM-Community in cooperation with the German weather service PhenomenonModel PhysicsOutlook TOT_PREC + ∆ v, mean July 60, ECHAM5 DT=90, DX=0.165 Developed by the CLM-Community in cooperation with the German weather service EXT, DX=0.44

6. Developed by the CLM-Community in cooperation with the German weather service PhenomenonModel PhysicsOutlook TOT_PREC + ∆ v, mean July 60, ECHAM5 DT=90, DX=0.165 Developed by the CLM-Community in cooperation with the German weather service DX=0.165 nested in DX=0.=0.44

7. Developed by the CLM-Community in cooperation with the German weather service PhenomenonModel PhysicsOutlook Climate Mode, mean July 79-94, ERA15 Developed by the CLM-Community in cooperation with the German weather service [mm] 0 0 00 0 0 climate modeModel ResultsOutlook

8. Developed by the CLM-Community in cooperation with the German weather service PhenomenonModel PhysicsOutlook Variation of Configuration DX Vert. Resol. nestingsponge CFL: V < V < 160 160km/h for forDT=900.165Shower??? 0.44

9. Developed by the CLM-Community in cooperation with the German weather service PhenomenonModel PhysicsOutlook DTS DTSDT30~201510 CFL: V < V < 160 160km/h for forDT=9090??? 75???? 60???? Shower Dependence on the time step: CLM_2.4.8, DX=0.165, KON≈LME

10. Developed by the CLM-Community in cooperation with the German weather service PhenomenonModel PhysicsOutlook DT=90, DTS=30TOT_PREC 7/60DT=90, DTS=10

11. Developed by the CLM-Community in cooperation with the German weather service PhenomenonModel PhysicsOutlook DT=75, DTS=30TOT_PREC 7/60DT=75, DTS=18.75

12. Developed by the CLM-Community in cooperation with the German weather service PhenomenonModel PhysicsOutlook DT=75, DTS=10TOT_PREC 7/60DT=75, DTS=18.75

13. Developed by the CLM-Community in cooperation with the German weather service PhenomenonModel PhysicsOutlook DT=60, DTS=30TOT_PREC 7/60DT=60, DTS=10

14. Developed by the CLM-Community in cooperation with the German weather service PhenomenonModel PhysicsOutlook T(l,t) central Spain 7/60 DT=90DT=75DT=60 DTS=30 DTS=10 DTS=30 DTS=18.75 DTS=10 DTS=30 DTS=10 300 K280 K220 K

15. Developed by the CLM-Community in cooperation with the German weather service PhenomenonModel PhysicsOutlook DTS DTSDT30~201510 CFL: V < V < 160 160km/h for forDT=9090 75Reference 60,,The day after tomorrow‘‘ Shower Overview: Leapfrog, CLM_2.4.8, DX=0.165, KON≈LME

16. Developed by the CLM-Community in cooperation with the German weather service PhenomenonModel PhysicsOutlook Dyn. Dyn.DT LM leapfrog dry Leapfrog semi-impl. RK p` RK p`T` 90 75Reference Shower Model Physics LM 3.19, DX=0.165, LME-Region, DTS=30s ??? Simulation series calculated by Ulrich Schättler

17. Developed by the CLM-Community in cooperation with the German weather service PhenomenonModel PhysicsOutlook Joining Skills of weather forecast and (regional) climate modelling Weather Forecast Detailed analysis of weather phenomena in a nonhydrostatic model Detailed analysis of weather phenomena in a nonhydrostatic model Extended model tests in the operational wether forecast Extended model tests in the operational wether forecast Systematic development of physical parameterizations Systematic development of physical parameterizations Further development of numerical schemes Further development of numerical schemes Climate Modelling Separation of model physics, initial and boundary conditions and data assimilation Detection of potential short-comings of LM clearly visible in long-term integrations. Assessment of climatologically relevant components (hydrological cycle, soil, conservation principles). Further development of the climate mode: “open” boundary conditions, new modules for aerosols, chemistry, biosphere and SST-dynamics, globally conserving and dispersion free numerical schemes for improved operational weather forecast and regional climate prediction with the hybrid LM/CLM Thank you for attention !

18. Developed by the CLM-Community in cooperation with the German weather service PhenomenonModel PhysicsCLM 2002 12.2005 10.2006 3.2004 6.2003

19. Developed by the CLM-Community in cooperation with the German weather service PhenomenonModel PhysicsCLM The climate and the forecast mode Climate mode Forecast mode Integration time 100y and more (from restart) 78h Integration time 100y and more (from restart) 78h Dependence on initial values no / weak after spin up strong Dependence on initial values no / weak after spin up strong Nudging of observations possibleyes Nudging of observations possibleyes vegetation, CO2 etc., SSTs prescribed constant vegetation, CO2 etc., SSTs prescribed constant Conservation principleshigh sensitivity hardly detectable Conservation principleshigh sensitivity hardly detectable Statistics Dependence on initial conditionsnoyes Dependence on boundary condit.Yesyes Dependence on observationsweakstrong