François Bouyssel CNRM-GAME. ECMWF/WCRP/WWRP workshop on drag processes and their links to largescale circulation, September 2016, Reading
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1 Parametrizations of sub-grid orography effects in global and regional models at Météo-France. Sensitivity studies to parametrizations and horizontal resolution. François Bouyssel CNRM-GAME ECMWF/WCRP/WWRP workshop on drag processes and their links to largescale circulation, September 2016, Reading
2 Global Arpege and LAM Arome models Numerical models used both for operational weather forecasting and climate studies (deterministic and ensemble systems) ARPEGE Deterministic Tl1198c2.2 L105 (7.5km on W Europe) 4DVar (6h cycle): Tl149c1L105 & Tl399c1L105 5 forecasts per day up to 114h AROMEFrance Deterministic 1.3km (1536 x 1440 pts) L90: from 5m to 10hPa 3DVar (1h cycle) 5 forecasts per day up to 42h 2
3 Physical packages Targeted physics for hydrostatic scales (ARPEGE NWP and Climat) Operational physics of convective scale model (AROME NWP and Climat) Surface SURFEX (Masson et al., 13): surface modelling platform Radiation RRTM (Mlawer, 97) + SW6* (Fouquart 80, Morcrette 01) Turbulence 1.5 order scheme prognostic TKE (Cuxart et al., 00) Mixing length Non local, buoyancy based (Bougeault-Lacarrère, 89) PBL thermals New scheme PCMT (5 prog. var) PMMC09 (Pergaud et al., 09) (Piriou et al., 07) and (Gueremy, 11) Clouds Microphysics PDF based: (Smith, 90) or (Bougeault, 82) Bulk scheme with 4 prog. var. (Lopez, 02) Convection New scheme PCMT (5 prog. var) Bulk scheme** 5 prog. var. (Pinty and Jabouille, 98) x (Piriou et al., 07) and (Gueremy, 11) Subgrid orographic effects (GWD, blocking, etc.) Catry-Geleyn (08) x
4 Sub-grid scale orography parameterizations in Météo-France models ARPEGE Climat ARPEGE NWP AROME Enhanced orography Effective roughness length Subgrid orography scheme (GWD, blocking, lift, etc.) NO Georgelin et al., 1994 Boer et (1984), with modifications Catry et al YES (mean+σh) Georgelin et al., 1994 Boer et (1984), with modifications Catry et al NO Georgelin et al., 1994 NO
5 SSO scheme Surface drag for the wave part (Boer et al., 1984) Anisotropy effects (following Phillips, 1984) Deposition effects (following Lindzen, 1981) Wave trapping Form drag part (Lott et Miller, 1997) Lift effect CATRY, B, JF GELEYN, F BOUYSSEL, J CEDILNIK, R BROZKOVA, M DERKOVA, and R MLADEK. 2008: A New Sub-grid Scale Lift Formulation in a Mountain Drag Parameterisation Scheme. Meteorologische Zeitschrift 17 (2):
6 WGNE DRAG-project ( Ayrton Zadra )
7 WGNE DRAG-project ( Ayrton Zadra )
8 WGNE DRAG-project ( Ayrton Zadra )
9 Impact of turning-off the SSO scheme
10 Impact of turning-off SSO scheme
11 Impact of removing envelop orography
12 Impact of removing envelop orography
13 Impact of removing effective roughness length
14 Impact of removing effective roughness length
15 Tuning parameters in SSO scheme (gravity waves, blocking, lift, etc.) PNT CLIMAT INVERSE CRITICAL HEIGHT FOR THE G.W.D. ( GWDBC ) DRAG COEFFICIENT FOR FOR THE LOW LEVEL G.W.D. ( GWDCD ) VALLEYS DECOUPLING COEFF. FOR THE G.W.D. ( GWDVALI ) MOUNTAIN SHAPE COEFF. FOR THE G.W.D. ( GWDPROF ) RESONNANCE COEFFICIENT FOR THE G.W.D. ( GWDAMP ) SURFACE LIFT COEFF. FOR THE G.W.D. ( GWDLT ) FACTOR FOR THE ST. DEV. OF OROG. FOR G.W.D. "WALL" ( HOBST ) ASPECT RATIO TYPE COEFF. AT THE SURF. FOR THE G.W.D. ( GWDSE )
16 Global tendency on Kinetic Energy due to SSO scheme (Jan 16) J/kg/day Sensitivity tests modifying tuning parameters : GWDLT=1 GWDCD=9 GWDSE=0.008 GWDPROF=0 GWDVALI=0 HOBST=2 REF (oper)
17 Global tendency on Kinetic Energy due to SSO scheme (Jan 16) J/kg/day Sensitivity tests modifying tuning parameters : GWDLT=1 GWDCD=9 GWDSE=0.008 GWDPROF=0 GWDVALI=0 HOBST=2 REF (oper)
18 Dependency to horizontal resolution ARPEGE global forecasts with operational physics done on January 2016, initialized from operational analysis, using stretching capability. Comparison of simulations spatially over Western Europe and averaged horizontally over a rectangular domain centered over the Alps : T149c1L105 (~135 km) T399c1L105 (~ 50 km) T1199c1L105 (~ 16 km) T1198c2.2L105 (~ 7.5 km) T1198c8L105 (~ 2 km) - turning off SSO scheme
19 Mean orography T149c1L105 (~135 km) T399c1L105 (~50 km) T399c1L105 T1199c1L105 ( ~ 16 km) T1198c2.2L105 (~ 7.5 km) T1198c8L105 (~2km) T1199c1L105NE ( ~ 16 km)
20 Standard deviation of orography T149c1L105 (~135 km) T399c1L105 (~50 km) T399c1L105 T1198c2.2L105 (~ 7.5 km) T1199c1L105 ( ~ 16 km) T1198c8L105 (~2km)
21 Dynamical roughness length T149c1L105 (~135 km) T399c1L105 (~50 km) T399c1L105 T1199c1L105 ( ~ 16 km) T1198c2.2L105 (~ 7.5 km) T1198c8L105 (~2km) T1199c1L105NF ( ~ 16 km)
22 Anisotropy T149c1L105 (~135 km) T399c1L105 (~50 km) T399c1L105 T1198c2.2L105 (~ 7.5 km) T1199c1L105 ( ~ 16 km) T1198c8L105 (~2km)
23 Directionality T149c1L105 (~135 km) T399c1L105 (~50 km) T399c1L105 T1199c1L105 ( ~ 16 km)
24 SSO surface drag T149c1L105 (~135 km) T399c1L105 (~50 km) T1198c2.2L105 (~ 7.5 km) T1199c1L105 ( ~ 16 km) T1198c8L105 (~2km)
25 Sub-grid turbulence surface drag T149c1L105 (~135 km) T399c1L105 (~50 km) T1198c2.2L105 (~ 7.5 km) T1199c1L105 ( ~ 16 km) T1198c8L105 (~2km)
26 Total parameterized surface drag T149c1L105 (~135 km) T399c1L105 (~50 km) T1198c2.2L105 (~ 7.5 km) T1199c1L105 ( ~ 16 km) T1198c8L105 (~2km)
27 Surface turbulent drag in Arome-France (1.3km)
28 Kinetic energy budget over Alps domain T149c1L105 (~135 km) T399c1L105 (~50 km) T399c1L105 T1198c2.2L105 (~ 7.5 km) T1199c1L105 ( ~ 16 km) T1198c8L105 (~2km)
29 Conclusions Sub-grid orography effects are important to parameterize in NWP and climate models at current resolutions Difficult to constrain SSO and turbulence parameterizations (compensating errors, several parameters to tune) Still struggling to remove enhanced orography in global NWP Arpege model. Automating tuning? Improving blocking and/or lift parameterizations? Wish to continue investigations using high resolution simulations for improving SSO scheme in global models. What is the best methodology?
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