1. Objective verification results for RK parallel runs
Lucio Torrisi
CNMCA, National Meteorological Center,Italy
COSMO General Meeting, Moscow 6-9 September 2010 1

2. CNMCA NWP System Data Assimilation: 2.8 km 50 v.l. 14 km 40 v.l. 7 km
3DVAR PSAS FGAT (T,u,v,qv,ps) every 3h using
TEMP, PILOT, SYNOP, SHIP, BUOY, Wind Profiler,
AMSUA rad., AMDAR-ACAR-AIREP, MSG/MODIS
AMV, METOP/QUIKSCAT/ERS2 scatt. winds
+ Land SAF snow mask,
IFS SST analysis once a day
Data Assimilation:
COSMO-ME (7km) ITALIAN MET SERVICE
2.8 km
50 v.l.
compressible equations
explicit convection
14 km
40 v.l.
hydrostatic equations
parameterized convection
7 km
40 v.l.
compressible equations
parameterized convection
Local Area Modelling:
COSMO 2 2 2 2 2 2 2

3. 7km RK/LF comparison
In March, itype_bbc_w in COSMO-ME RK (with explicit vertical
advection) parallel run was switched from 1 to 0 .
Option for selecting the lower boundary condition for vertical wind speed
(new NL switch itype_lbc_w):
0/1: RK-like method following iadv_order
2/3: Differencing following iadv_order without RK stepping
4/5: Fourth-order centered differences
0/2/4: include extrapolation of horizontal wind to surface
1/3/5: no extrapolation of horizontal wind to surfacee

8. 7km RK/LF comparison
RK has a colder bias in stratosphere (Rayleigh damping setting?)
RK slightly warmer than LF in the lower levels
RK slightly less negative bias in wind speed than LF
RK tends to overestimate light precipitation events and underestimate the most intense ones

9. Heat and moisture source term in p equation
Turbulent heat and
Radiaton flux
Diabatic heating due to
cloud microphysical sources
Turbulent flux for
water constituents
Cloud heat sources
Turbulent flux for water constituents and
Precipitation (gravitational diffusion) fluxes

10. Heat and moisture source term in p equation
The reformulated equations are:
If these new terms are added in the p/T equations, the saturation adjustment scheme has to be consistently adapted to the changes in p/T equations.
( in coop. with Ronny Petrik)

11. Heat and moisture source term in p equation
A preliminary version with QT>>QM was already implemented a few years ago (Torrisi, 2008)
The full version is almost complete
Work in the saturation adjustment is ongoing
In cooperation with Ronny Petrik

12. Thanks for the attention!
Any questions?