Summary of WG3 activities Physical Aspects Federico Grazzini ARPA Emilia- Romagna Servizio Idro Meteo Clima (SIMC)
Jan 05, 2016
Summary of WG3 activitiesPhysical Aspects
Federico Grazzini ARPA Emilia- RomagnaServizio Idro Meteo Clima (SIMC)
WG3 activities
• Boundary layer (5 wp)• Radiation (1wp)• Deep convection and grid scale precip (3 wp)• Lower boundary conditions (3 wp)• Diagnostic (2 wp)
http://cosmo-model.cscs.ch/content/tasks/workGroups/wg3/workPlans.priv/workPlan2008.htm
PBL
Revision of 2Tm diagnostic (implemented in version 4.3) Revision of the surface transfer scheme New concept for a roughness layer extension of the current turbulence
scheme Introduction of the mixed water/ice phase in the moist turbolent scheme
and stat. condensation scheme(Raschendorfer, DWD)
Test and implementation of Lott and Miller sub-grid scale orography scheme (SSO) (Schulz,DWD)
Revised parameter (turlen, SGS cloud) settings in the COSMO-DE boundary layer (TKE) scheme (Seifert, DWD)
Hovmöller diagramms or precipiation rate1 May to 9 June 2008
• In the operational COSMO-DE almost no diurnal cycle, the afternoon maximum is very weak.
• Clear improvement in the model behavior using the modified PBL parameters. Reduced nocturnal drizzle, better afternoon maximum
Courtesy of A. Seifert
Radiation
A new parameterization for ice cloud radiative properties has been developed and tested and introduced in the model (Bozzo, Univ. Bologna)
A new scheme accounting for topographic effect on radiation (Buzzi, MeteoSwiss)
A scheme to account for solar zenith angle in cloud overlap treatment (Di Giuseppe, ARPA-SIM)
CONVECTION
Implementation of Tiedtke ECMWF scheme (Mercogliano, CIRA)
Diagnostic of COSMO convective scheme (Grazzini, ARPA-SIM)
Modification of the Tiedtke(89) convection scheme: coexistence of cloud ice/water, changes in convective cloud condensate detrainment, changes in the RH env threshold for evaporation (implemented in version 4.4 Mironov, DWD)
Example 11 June 2007
avg 2.8 mm avg 3.9 mm avg 1.9 mmmax 44 mm max 274 mm max 27 mmavg 3.1 mmmax 60 mm
observation control new scheme
accumulated precipitation in mm
Courtesy of A. Seifert
SURFACE PROCESSES
Improving the multi-layer soil model TERRA (Vogel, DWD)
Implementation of mosaic approach (Ament, MeteoSwiss)
Impact of different Leaf area index specification (Di Giuseppe, ARPA-SIM)
Competence to be transferred to the new PP COLOBOC
DIAGNOSTIC
Diagnostic tools to analyse and understand the main forecast errors of the COSMO model focussing on the interaction between PBL and surface (Bonafè, ARPA-SIM)
Courtesy of G. Bonafè and G. Vogel
Courtesy of G. Bonafè and G. Vogel
Courtesy of G. Bonafè and G. Vogel
Courtesy of G. Bonafè and G. Vogel
Courtesy of G. Bonafè and G. Vogel
Courtesy of G. Bonafè and G. Vogel
Courtesy of G. Bonafè and G. Vogel
Issues
• More robust diagnostic, possibly on different areas/domains
• Exchange of model data or diagnostic recipes?• There should be a stronger feedback between research
activities and operational implementations…..• A step toward simplification: a reference version ?