Lucio Torrisi

CNMCA, National Meteorological Center,Italy

COSMO General Meeting, Moscow 6-9 September 2010

Objective verification Objective verification results for RK parallel results for RK parallel

runsruns

14 km40 v.l.

7 km40 v.l.

2.8 km50 v.l.

- hydrostatic equations- parameterized convection

- compressible equations- parameterized convection

- compressible equations- explicit convection

CNMCA NWP SystemCNMCA NWP System3DVAR 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

Local Area Modelling: COSMO

Data Assimilation:

COSMO-ME (7km) ITALIAN MET SERVICE

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

In March, itype_bbc_w in COSMO-ME RK (with explicit verticaladvection) parallel run was switched from 1 to 0 .

7km RK/LF comparison

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

Heat and moisture source term in p equation

bRbbCMT

MCTT

vd

TTzTTMMQc

p

td

Td )(

v

bRbbCMpvdpd ppzppMpcc

td

pd )(/ v

f

pd

sl

pd

v

pdT S

c

LS

c

L

cQ RH

1

Turbulent heat and Radiaton flux

Diabatic heating due tocloud microphysical sources

flflv PPFFF

pd

dfl

pd

v

d

v

pd

dM c

TRSS

c

TR

R

R

c

TRQ

1

Turbulent flux forwater constituents

Turbulent flux for water constituents and Precipitation (gravitational diffusion) fluxes

Cloud heat sources

Heat and moisture sourceterm in p equation

1/

1 1( )

MC CM CMpd vd T M T T p

vd pd

b b b R b bpd pd

d T pc c Q Q M M M

d t c c

T T p p z T T p pc c

v

bRbb

CMpMpdvdpd

MCTTpdvdpdvdpd

ppzppMQccc

MQcccpcctd

pd

)(/

1//

v

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.

The reformulated equations are:

( in coop. with Ronny Petrik)

A preliminary version with QT>>Q

M was already

implemented a few years ago (Torrisi, 2008)

The full version is almost complete Work in the saturation adjustment is ongoing

Heat and moisture sourceterm in p equation

In cooperation with Ronny Petrik

Thanks for the attention!Any questions?