Presented at the 8th
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Transcript of Presented at the 8th
The LM Climate Mode (CLM)The LM Climate Mode (CLM) and the and the
Leapfrog SchemeLeapfrog Scheme oror
the other way to
A.WillA.Will11, U.Böhm, U.Böhm33, A.Block, A.Block1 , 1 , K.KeulerK.Keuler11, B.Rockel, B.Rockel22,,
M.BaldaufM.Baldauf44 , A.Gaßmann , A.Gaßmann66, H.-J.Herzog, H.-J.Herzog44, and U.Schättler, and U.Schättler44
1 Brandenburg Technical University (BTU), Cottbus, Germany1 Brandenburg Technical University (BTU), Cottbus, Germany
2 GKSS Research Center Geesthacht, Geesthacht, Germany2 GKSS Research Center Geesthacht, Geesthacht, Germany
3 Potsdam Institute for Climate Impact Research (PIK), Potsdam, Germany3 Potsdam Institute for Climate Impact Research (PIK), Potsdam, Germany
4 German Weather Service (DWD), Offenbach, Germany4 German Weather Service (DWD), Offenbach, Germany, 6 , 6 University of Bonn, University of Bonn,
GermanyGermany
Presented at the 8th General Meeting
Developed by the CLM-Community
in cooperation with the
German weather service
Phenomenon Model Physics Outlook
Model run configuration:Model run configuration: CLM_2.4.8 -> CLM_2.4.8 -> www.clm-community.euwww.clm-community.eu and LM_3.19and 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 = 18kmDx = 18km Dt := 90 s for leapfrogDt := 90 s for leapfrog
TERRA_MLTERRA_MLββ• 10 Layers10 Layers
• z_1=1cm, z_10=11.5mz_1=1cm, z_10=11.5m
Dts = 30 sDts = 30 s
Developed by the CLM-Community
in cooperation with the
German weather service
Phenomenon Model Physics Outlook
TOT_PREC TOT_PREC + ∆ v+ ∆ v, mean July 60, ECHAM5, mean July 60, ECHAM5DT=90, DX=0.165
Developed by the CLM-Community
in cooperation with the
German weather service
Film: TOT_PREC+PP
Developed by the CLM-Community
in cooperation with the
German weather service
Phenomenon Model Physics Outlook
Variation of ConfigurationVariation of Configuration
DXoriginal Vert.
Resol.nesting sponge
0.165Shower
? ? ?
0.44
? ? ? ?
Domain size ? ? ? ?
CFL: V < 160 km/h for DT=90CFL: V < 160 km/h for DT=90
Developed by the CLM-Community
in cooperation with the
German weather service
Phenomenon Model Physics Outlook
TOT_PREC TOT_PREC + ∆ v+ ∆ v, mean July 60, ECHAM5, mean July 60, ECHAM5DT=90, DX=0.165
Developed by the CLM-Community
in cooperation with the
German weather service
EXT, DX=0.44
Developed by the CLM-Community
in cooperation with the
German weather service
Phenomenon Model Physics Outlook
TOT_PREC TOT_PREC + ∆ v+ ∆ v, mean July 60, ECHAM5, mean July 60, ECHAM5DT=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
Developed by the CLM-Community
in cooperation with the
German weather service
Phenomenon Model Physics Outlook
Climate Mode, mean July 79-94, ERA15Climate Mode, mean July 79-94, ERA15
Developed by the CLM-Community
in cooperation with the
German weather service
[mm]
0 0 0
climate mode Model Results Outlook
Developed by the CLM-Community
in cooperation with the
German weather service
Phenomenon Model Physics Outlook
Variation of ConfigurationVariation of Configuration
DX
Vert. Resol.
nesting sponge
CFL:
V <
160
km/h
for
DT=90
0.165Shower
? ? ?
0.44
Developed by the CLM-Community
in cooperation with the
German weather service
Phenomenon Model Physics Outlook
DTS
DT
30 ~20 15 10
CFL:
V <
160
km/h
for
DT=90
90? ? ?
75? ? ? ?
60? ? ? ?
Shower
Dependence on the time step: Dependence on the time step: CLM_2.4.8, DX=0.165, KON≈LMECLM_2.4.8, DX=0.165, KON≈LME
Developed by the CLM-Community
in cooperation with the
German weather service
Phenomenon Model Physics Outlook
DT=90, DTS=30 TOT_PREC 7/60 DT=90, DTS=10
Developed by the CLM-Community
in cooperation with the
German weather service
Phenomenon Model Physics Outlook
DT=75, DTS=30 TOT_PREC 7/60 DT=75, DTS=18.75
Developed by the CLM-Community
in cooperation with the
German weather service
Phenomenon Model Physics Outlook
DT=75, DTS=10 TOT_PREC 7/60 DT=75, DTS=18.75
Developed by the CLM-Community
in cooperation with the
German weather service
Phenomenon Model Physics Outlook
DT=60, DTS=30 TOT_PREC 7/60 DT=60, DTS=10
Developed by the CLM-Community
in cooperation with the
German weather service
Phenomenon Model Physics Outlook
T(l,t) central Spain 7/60DT=90 DT=75 DT=60
DTS=30 DTS=10 DTS=30 DTS=18.75 DTS=10 DTS=30 DTS=10
300 K 280 K 220 K
Developed by the CLM-Community
in cooperation with the
German weather service
Phenomenon Model Physics Outlook
DTS
DT
30 ~20 15 10
CFL:
V <
160
km/h
for
DT=90
90
75Reference
60 ,,The day after
tomorrow‘‘
Shower
Shower
Overview: Leapfrog, CLM_2.4.8, DX=0.165, KON≈LMEOverview: Leapfrog, CLM_2.4.8, DX=0.165, KON≈LME
Developed by the CLM-Community
in cooperation with the
German weather service
Phenomenon Model Physics Outlook
Dyn.
DT
LM leapfrog dry Leapfrog semi-impl.
RK p` RK p`T`
90
75
Reference
Shower
Model Physics LM 3.19, DX=0.165, LME-Region, DTS=30s
??????
Simulation series calculated by Ulrich SchättlerSimulation series calculated by Ulrich Schättler
Developed by the CLM-Community
in cooperation with the
German weather service
Phenomenon Model Physics Outlook
Joining Skills of weather forecastJoining Skills of weather forecast
and (regional) climate modellingand (regional) climate modelling Weather ForecastWeather Forecast• Detailed analysis of weather Detailed analysis of weather
phenomena in a nonhydrostatic phenomena in a nonhydrostatic modelmodel
• Extended model tests in the Extended model tests in the operational wether forecastoperational wether forecast
• Systematic development of Systematic development of physical parameterizationsphysical parameterizations
• Further development of numerical Further development of numerical schemesschemes
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 !
Developed by the CLM-Community
in cooperation with the
German weather service
Phenomenon Model Physics CLM
2002
12.2005
10.2006
3.2004
6.2003
Developed by the CLM-Community
in cooperation with the
German weather service
Phenomenon Model Physics CLM
The climate and the forecast modeThe climate and the forecast modeClimate mode Climate mode Forecast modeForecast mode
Integration time Integration time 100y and more (from restart) 100y and more (from restart) 78h78h
Dependence on initial values Dependence on initial values no / weak after spin up no / weak after spin up strong strong
Nudging of observations Nudging of observations possiblepossible yesyes
vegetation, CO2 etc., SSTsvegetation, CO2 etc., SSTs prescribed prescribed constantconstant
Conservation principlesConservation principles high sensitivity high sensitivity hardly detectablehardly detectable
Statistics Dependence on initial conditions no yes
Dependence on boundary condit. Yes yes
Dependence on observations weak strong