1. Arome SCM mini-intercomparison
Sylvie Malardel
Julien Pergaud, Valery Masson,
(Arome/Méso-NH, CNRM, Météo-France)
Pedro Soares

2. Shallow convection schemes Rico composite, L80 with KFB, EDMF, EDKF
Arome, SCUM …
Shallow convection schemes
Rico composite, L80 with KFB, EDMF, EDKF
Rico composite, L41
LCL

3. Arome
Arome : the NH-dynamics from IFS/ARPEGE/Aladin and a mesoscale physics from Méso-NH
ECMWF radiation scheme
SURFEX (externalized surafec scheme from Méso-NH)
CBR turbulent scheme from Méso-NH (TKE)
explicit microphysics (1 moment, 2 liquid and 3 ice species)
+ a shallow convection parametrisation
KFB directly from Méso-NH
EDMF and EDxx

4. SCUM : Single Column Unified Model
An option to run ARPEGE/ALADIN/AROME
in a (pseudo)-1D configuration:
everything as in the 3D model
+ large scale forcing
on Linux PC
A 1D testbed for intercomparison of (IFS)/ARPEGE/ALADIN/AROME/(HIRLAM)/(ALARO) physics

5. Which shallow convection scheme for Arome ?
Do we need one ?
KFB : « copy » of the deep convection scheme developed in Méso-NH (Bechtold et al, 1993) + statistical cloud scheme (Chaboureau and Bechtold, 2002)
Mass flux with LCL triggering and CAPE closure
EDMF : Mass flux scheme developed by P. Soares (SOARES et al, 2004) in Méso-NH with « light » technical modifications
EDKF : « modified » EDMF (Pergaud, Malardel, Masson, this summer) with
Dry updraft from Lappen and Randall, 2001
Cloudy updraft from Kain and Fritsch, 1990

6. From Lappen and Randall,
LCL
From Kain and Fritsch,
1990
EDKF updraft
prototype
From Lappen and Randall,
2001
(surface fluxes)
SURFEX

7. Rico : high resolution composite case
No shallow convection scheme
Explicit cloud
under a strong inversion

8. Rico : high resolution composite case
KFB shallow convection scheme
(Bechtold et al, 1993)
with statistical cloud scheme
(Chaboureau and Bechtold, 2002)
Results are identical if shallow+deep

9. Rico : high resolution composite case
EDMF (Soares et al, 2004)
with statistical cloud scheme
+36 h

10. Rico : high resolution composite case
EDKF (Pergaud, Malardel, Masson)
+36 h

11. Rico : high resolution composite case
EDKF (Pergaud, Malardel, Masson)
with subgrid autoconversion
Rain specific content (g/kg)

12. Rico : high resolution composite case
EDKF without and with subgrid autoconversion
no AUCV
no AUCV
AUCV
AUCV
AUCV
no AUCV
no AUCV
AUCV
no AUCV
AUCV

13. Rico : composite case with Arome resolution (L41)

14. Rico : Arome resolution (L41) composite case
t=24h
t=24h
L80
L41
L80
L41
L80
L41
L80
L41
23-24h
average
23-24h
average