1. COSMO General Meeting, 19 September 2007
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

2. 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)

3. Revision of the near surface diagnosis (Raschendorfer; update)
COSMO-EU:
BL is too moist and too cold; despite this, T2m is too high at noon; this is particularly true for grid points with a large z0 and an unnaturally moist soil.
Hypothesis:
diagnosed T2m is too high if compared to SYNOP measurements, especially for grid-points with large z0;
SMA 'corrects' for this by adding water to the soil, thereby moistening and cooling the BL;
Problem of wrongly diagnosed T2m in COSMO-EU only visible when even a saturated soil can not correct the positive T2m bias
Cure:
Use z0 = 0.02 m for T2m diagnosis
Additional changes to stability functions needed, especially for stable stratification

4. GME Verification of T2M: Routine, i. e
GME Verification of T2M: Routine, i.e. z0=z0(grid average) for T2M diagnosis

5. GME Verification of T2M: Experiment, i. e
GME Verification of T2M: Experiment, i.e. z0=z0(SYNOP station) for T2M diagnosis

6. 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)

7. Sensitivity of the diurnal cycle to PBL assumptions:
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.

8. WP 3.3: Convection
3.3.1: Implementation of Kain-Fritsch scheme

9. WP 3.4: Radiation 3.4.1: Cloud-radiation interaction
3.4.2: Improve radiation treatment at small mesh-sizes

10. 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!)

11. 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)

12. Soil moisture (3-9cm) Falkenberg site

13. Result II – Budget Summary
Snow SM
Evaporation
Rain
Surface Runfoff
Intermediate Runfoff
Ground Runfoff
Result II – Budget Summary
Runoff_s mm
Runoff_g mm
Runoff_m
Evapo.
DSM
lE (JA)
W/m2
CTL
440
359
196
621 4 93
Deviations in mm
Reduced Runoff
RIGID, GWATER
Reduced interm. Runoff
BROOKS1, BROOKS2
Reduced Evapo. (sustainable)
NP89, VEGPARA, Z0LOC
Little impact
ROOTDIST, MACROPOR
Problematic
ECOVEG (dry out!)
RIGID -1
-97 7 22 75 5
GWATER
-29 3 1
BROOKS1
-21 20
-116 -6 -2
BROOKS2
-20 61
-128
-30
-11 -4
BROOKS3 -
ECOSOIL 29
-22
-14 10
MACROPOR
-12 2
-18 4 6
PEDO -9 54
-65
-34
-10
VEGPARA 32 13
-44 12
ROOTDIST
ECOVEG 45
101
-118 17
NP89 66
-84 18
Z0LOC 25 9
-37 -3

14. Uncertainty ranges T2m daily temperature range Yearly average
Monthly average

15. WP 3.x: Lower boundary condition: snow
An advanced snow parameterization for the COSMO-model  poster by Ekaterina Machulskaya et al

16. 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, …)

17. WP 3.7: Lower boundary condition: urban areas
3.7.1: Urban turbulence parameterisation

18. WP 3.8: Lower boundary condition: mosaic and tiles
3.8.1: Implementation of mosaic approach

19. WP 3.9: Sub-km version
3.9.1: High-resolution numerical modelling of deep moist convection dynamics

20. WP 3.10: Validation and related matters
3.10.1: Single column model studies
3.10.2: Development of a tool for extended parameter determination (NN)

21. WP 3.11: Efforts to cure observed model deficiencies
3.11.1: Improve diagnosis of convective and turbulent gusts (NN)
3.11.2: Investigate reason for cold/moist bias in PBL

22. 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

23. 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