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WG 3: Overview status report

WG 3: Overview status report. Marco Arpagaus. COSMO General Meeting, 19 September 2006 Detailed status reports available on the COSMO web-site Acknowledgments: WG 3 members. WP 3.1: Planetary boundary layer. 3.1.1: Surface transfer scheme and turbulence scheme

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WG 3: Overview status report

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  1. WG 3: Overview status report Marco Arpagaus COSMO General Meeting, 19 September 2006 Detailed status reports available on the COSMO web-siteAcknowledgments: WG 3 members

  2. WP 3.1: Planetary boundary layer • 3.1.1: Surface transfer scheme and turbulence scheme • 3.1.1.1: Revision of the transfer scheme and the near surface diagnosis together with the completion of relevant documentation • 3.1.1.2: Reorganisation of the turbulence scheme and implementation of the 3-d extension together with the completion of relevant documentation • 3.1.1.3: Extensions of the SC framework • 3.1.1.4 New concept for the roughness layer extension of the current turbulence scheme • 3.1.1.5: Higher vertical resolution for the lowest part of the boundary layer (NN) • 3.1.2: Special boundary layer matters • 3.1.2.1: Urban turbulence parametrisation

  3. Revision of the near surface diagnosis (Raschendorfer) Interpolation of 2m-level: Diagnosis: • Too strong amplitude of diurnal cycle (T!) for grid points withlarge roughness length compared to SYNOP measurements Solution: • Exponential canopy profiles represent the grid point mean but not the special SYNOP-station surface (lawn) • Logarithmic free turbulent profile function with roughness length adopted to a typical SYNOP station Note: A similar treatment had been introduced for 10m wind some years ago.

  4. Revision of the near surface diagnosis (Raschendorfer) Daily cycle of near surface temperatures for a large roughness length: test version with SYNOP-station profile actual version with exponential canopy profile

  5. Single column model studies(Buzzi & Rotach)  poster Operational configuration, after 9h of simulation

  6. Single column model studies(Buzzi & Rotach) • too strong mixing (KH,KM ≥ 1 m2/s) • instabilities due to thin vertical layers (mainly via circulation term) • KH,KM ≥ 0.1 m2/s … - see poster!

  7. WP 3.2: Microphysics • 3.2.1: Improvement of the three-category ice scheme poster by Thorsten Reinhardt

  8. Improvement of the three-category ice scheme (Reinhardt) Conclusions: • In LMK simulations of idealized strong convection simulated precipitation can be highly sensitive to the assumed graupel particle properties. • This sensitivity was much weaker in simulations of real weather situations. • Changing graupel properties toward those of more hail-like properties does not cure problem of underestimated convection in LMK. • Therefore a change in the parameterization of the graupel category in the microphysics scheme was not introduced. The WP is completed.

  9. WP 3.3: CloudsWP 3.4: Convection no regular WPs - but: Evaluation of the Kain-Fritsch /Bechtold convection scheme (Dierer & Schubiger)  poster all 800m – 1500m black: operational; red: Kain-Fritsch/Bechtold < 800m > 1500m

  10. WP 3.5: Radiation • 3.5.1: Cloud-radiation interaction poster by Alessio Bozzo • 3.5.2: Improve radiation treatment at small mesh-sizes

  11. Cloud-radiation interaction (Bozzo) • Heating rates: • water clouds: ok • ice clouds: ok for SW, see picture for LW • Surface fluxes: • water clouds: LM clouds too opaque to SW, ok for LW • ice clouds: ok for SW, LW needs further inspection

  12. WP 3.6: Soil processes • 3.6.1: Revision of external parameters for plants • 3.6.2: Implementation of lake model into the LM • 3.2.3: Intercomparison of soil models in the framework of soil moisture validation poster by Gerd Vogel • no formal WP: Aspects on running the soil model for climate runs poster by Andreas Will • no formal WP: High resolution soil moisture analysis by assimilation of observations in LM-TERRA  poster by Felix Ament

  13. Implementation of lake model into the LM (Mironov) Lake surface temperature (Ts= Ti for frozen lakes): green- forecast with LM-FLake, black - LM SST Analysis Lake Hjalmaren Lake Balaton Ice thickness

  14. Intercomparison of soil models in the framework of soil moisture validation(Vogel et al.) 3-9 cm 9-27 cm 27-81 cm

  15. Priority projects • Towards Unified Turbulence-Shallow Convection Scheme (‘UTCS’; PL: Dmitrii Mironov) talk by Matthias Raschendorfer • Tackle deficiencies in precipitation forecasts (‘QPF’; PL: Marco Arpagaus) talks by … … Uli Damrath (task 1: find poor QPF cases) … Axel Seifert (task 2: suggest model changes)

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