Federal Department of Home Affairs FDHA Federal Office
- Slides: 16
Federal Department of Home Affairs FDHA Federal Office of Meteorology and Climatology Meteo. Swiss WG 3: Status Report Marco Arpagaus COSMO General Meeting, 19 September 2007 Detailed status reports available on the COSMO web-site Acknowledgments: WG 3 members
WP 3. 1: Boundary layer (turbulence and surface transfer scheme) • 3. 1. 1: Revision of the transfer scheme together with the related documentation • 3. 1. 2: Reorganisation of the turbulence scheme and implementation of the 3 -d extension together with the completion of relevant documentation • 3. 1. 3: Extensions of the SC framework • 3. 1. 4: New concept for a roughness layer extension of the current turbulence scheme • 3. 1. 5: Higher vertical resolution for the lowest part of the boundary layer (NN) WG 3: Status Report 2
Revision of the near surface diagnosis (Raschendorfer; update) • COSMO-EU: • BL is too moist and too cold; despite this, T 2 m is too high at noon; this is particularly true for grid points with a large z 0 and an unnaturally moist soil. • Hypothesis: • diagnosed T 2 m is too high if compared to SYNOP measurements, especially for grid-points with large z 0; • SMA 'corrects' for this by adding water to the soil, thereby moistening and cooling the BL; • Problem of wrongly diagnosed T 2 m in COSMO-EU only visible when even a saturated soil can not correct the positive T 2 m bias • Cure: • Use z 0 = 0. 02 m for T 2 m diagnosis • Additional changes to stability functions needed, especially for stable stratification WG 3: Status Report 3
Deutscher Wetterdienst GME Verification of T 2 M: Routine, i. e. z 0=z 0(grid average) for T 2 M diagnosis
Deutscher Wetterdienst GME Verification of T 2 M: Experiment, i. e. z 0=z 0(SYNOP station) for T 2 M diagnosis
WP 3. 2: Grid-scale clouds and precipitation no regular WPs – but: • Revision of microphysical parameterisation (cloud ice & graupel schemes) by Axel Seifert • … poster by Axel Seifert and Michael Baldauf on 'Explicit forecasting of deep convection with COSMO-DE' • Supercell Detection Index • Sensitivity to PBL Scheme (diurnal cycle of deep convection) WG 3: Status Report 6
Sensitivity of the diurnal cycle to PBL assumptions: Precipitation frequency Hovmöller diagrams for Germany from 1 June to 21 July 2007 Radar • • Control run Less diffusive ‘dry’ PBL Now the radar observations show an even more pronounced diurnal cycle The current version of COSMO-DE is not able to reproduce this diurnal cycle A modified PBL scheme can help to get the diurnal cycle even on a 2. 8 km grid Obviously the mass average is dominated by larger-scale events, therefore the frequency diagram ist better for looking at the air mass / orographic convection which is weaker than the forced convection. COSMO General Meeting 2008, Athens, Greece -7 -
WP 3. 3: Convection WP 3. 4: Radiation • 3. 3. 1: Implementation of Kain-Fritsch scheme • 3. 4. 1: Cloud-radiation interaction • 3. 4. 2: Improve radiation treatment at small mesh-sizes ( Done! – WP is finished!) WG 3: Status Report 10
WP 3. 5: Lower boundary condition: soil and vegetation • 3. 5. 1: Revision of external parameters for plants (NN) • 3. 5. 2: Intercomparison of soil models in the framework of soil moisture validation poster by Gerd Vogel More sensitivities studies by Felix Ament ( poster: Evaluating modifications of the soil module TERRA) and Alexander Block (CLM) WG 3: Status Report 11
Meteorological Observatory Lindenberg – Richard Aßmann Observatory Soil moisture (3 -9 cm) Falkenberg site Gerd Vogel (DWD FELG)
Rain Result II Snow – Budget Summary CTL Evaporation SM Runoff_s mm Runoff_g mm Runoff_m mm Evapo. mm DSM mm l. E (JA) W/m 2 440 359 196 621 4 93 Deviations in mm Surface Runfoff Intermediate Runfoff Ground Runfoff Reduced Runoff RIGID -1 -97 7 22 75 5 GWATER 0 -29 3 7 22 1 BROOKS 1 -21 20 -116 -6 7 -2 Reduced interm. Runoff BROOKS 2 -20 61 -128 -30 -11 -4 BROOKS 1, BROOKS 2 BROOKS 3 - - - ECOSOIL 29 -22 -2 -14 10 -2 Reduced Evapo. (sustainable) MACROPOR -12 2 -18 4 6 1 NP 89, VEGPARA, Z 0 LOC PEDO -9 54 -65 -34 -10 -4 VEGPARA 1 32 13 -44 12 -6 Little impact ROOTDIST 0 -2 -1 1 2 -2 ROOTDIST, MACROPOR ECOVEG 29 -11 45 101 -118 17 NP 89 1 66 22 -84 18 -2 Problematic Z 0 LOC 25 9 2 -37 4 -3 ECOVEG (dry out!) COSMO GM, Athens Felix. Ament@meteoswiss. ch RIGID, GWATER 13
Uncertainty ranges T 2 m Yearly average daily temperature range Monthly average 14
WP 3. x: Lower boundary condition: snow • An advanced snow parameterization for the COSMOmodel poster by Ekaterina Machulskaya et al WG 3: Status Report 15
WP 3. 6: Lower boundary condition: lakes • 3. 6. 2: Implementation of lake model into the LM poster by Dmitrii Mironov • Done! – WP is finished! • Flake is ready to be used! • Flake is very popular (HIRLAM, UM, Météo-France, ECMWF, …) WG 3: Status Report 16
WPs 3. 7 to 3. 11 • 3. 7. 1: Urban turbulence parameterisation • 3. 8. 1: Implementation of mosaic approach • 3. 9. 1: High-resolution numerical modelling of deep moist convection dynamics • 3. 10. 1: Single column model studies • 3. 10. 2: Development of a tool for extended parameter determination (NN) • 3. 11. 1: Improve diagnosis of convective and turbulent gusts (NN) • 3. 11. 2: Investigate reason for cold/moist bias in PBL WG 3: Status Report 22
Priority projects • Towards a Unified Turbulence-Shallow Convection Scheme (‘UTCS’; PL: Dmitrii Mironov) talk by Dmitrii Mironov Note 1: Need (much …) more individual initiative from project participants! Note 2: Need a (much …) better idea of the individual tasks! • Tackle deficiencies in precipitation forecasts (‘QPF’; PL: Marco Arpagaus) talk by Silke Dierer WG 3: Status Report 23
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