09 11-yann seitty-arome status
TRANSCRIPT
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Status of AROME
model delelopmentsYann Seity, Pierre Brousseau, Thibaut Montmerle, Gwennalle
Hello, Sylvie Malardel,Valry Masson, Yves Bidet, PatrickSanturette ( Mto-France)
29th EWGLAM meeting, Dubrovnik, October 2007
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Historical introduction
Design of the pre operational suite
Examples of good AROME forecasts
Remaining known problems and solutions Conclusion and outlooks
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Introduction
Application of Research to Operational at Meso-scalE
- First version of the AROME prototype in 2004 on CY28
-NH
RRTM, FM (6 bands)
Surfex 2 bf5
MASDEV_47 : ICE3, 1D turb(BL89 closure), KFB
CY32T3 :
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Introduction
- Daily experimentations of the prototype on of Francesince May 2005
AROME FRAN (512x512)
- Daily experimentations on France since January 2007(NEC SX8R) without data assimilation
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Introduction
- September 2007 : Configuration of AROME suite on operational NEC
computer with data assimilation (30 h forecasts at 0, 6, 12 and 18 TU)- Spring 2008 : AROME pre-operational suit managed by operational team
- October 2008 : AROME declared operational at Meteo-France
- End of 2009 : NEC v2 : x5 : increase vertical resolution
Model domain (600x512x41)
Domain provided to forecasters
(LAT-LON 0.025)
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First design of the operational suite
Coupling files
Guess
Technical overview :
Cycling of hydrometeores
60s time step, Full radiation every 15
64 processors, hourly coupling with ALADIN-France
= 30 elapse
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AROME suite : on 64 procs,FC24 performed in 30 elapse
Cost of AROME Physics :
First design of the operational suite
Shallow
Convection
8%
Turbulence
19%
Surface
4%
Interfaces
12%
Microphysics
15%
Radiation42%
SL advection
22%
Physics
24%
others
coupling, FFT,
dynamics)
20% Communications
34%
Currently being
optimized by NECIngeneers
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Historical introduction
Design of the pre operational suite
Examples of good AROME forecasts
Remaining known problems and solutions Conclusion and outlooks
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Cumulative rainfalls :August 21st 2007
AROME
ALADIN
Radar
RR 24h 6-6TU
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AROME
ALADIN
Radar
RR 24h 6-6TU
AROME : Goodstructures and maximalocalisation, butexcessive in terms ofintensity.
Cumulative rainfalls :August 23rd 2007
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Foehn over Massif Central
HU AROMEFC+12h
Satellite VISpicture
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Frontal precipitation bands (1)
Systme frontal dont la structure verticale prsente une cassure : en
altitude le front se dtache de sa partie en basses couches et le front
dans les couches moyennes et suprieures (au-dessus de 700 hPa
environ) avance plus vite que la trace de basses couches.
A thin cold front precipitating band.
Simulated radar reflectivity (FC+13h ) vs radar picture, 1 Mars 2007 ; 13 UTC
Vertical velocity, w (updrafts in red)
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31 May 2006 on SUDE domain
31 May 2006
Change of wind and Temperature due to cold air coming from the Alps
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31 May 2006 : 9 UTC
AROME (T. 2 m., v.20 m. et Ps) ALADIN (T. 2 m., v.20 m. et Ps)
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31 May 2006 : 12 UTC
AROME (T. 2 m., v.20 m. et Ps) ALADIN (T. 2 m., v.20 m. et Ps)
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31 May 2006 : 18 UTC
AROME (T. 2 m., v.20 m. et Ps) ALADIN (T. 2 m., v.20 m. et Ps)
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Temperatures (1)
Tempr atures Tourettes - 31 mai 2006
0
5
10
15
20
25
4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
Heure (UTC)
C
Observation Arome Aladin
Tempratures Seillans - 31 mai 2006
0
2
4
6
8
10
12
14
16
18
20
4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
Heure (UTC)
C
Observation Arome Aladin
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A Flood case
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AROME cumulative rainfall from 3 TU to 6 TU(FC30-FC27 )
A Flood case
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Historical introduction
Design of the pre operational suite
Example of good AROME forecasts
Remaining known problems and solutions Conclusion and outlooks
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Statistic sedimentation scheme for precipitations
n
n+1
w.tw, qrz
Fn
Fn+1
= ?
P1= min (1, w t ) (Proportion of the layer falling during dt)z
P2= max (0, 1 -z ) (Proportion of Fn falling through the layer during dt )wt
(Yves Bouteloup,
JF Geleyn)
Fn+1= P1. .qr.z + P2.Fn
t
AROME 60s
AROME Sedim
Before : Eulerian discretisation with time splitting -> costly.Now : in CY32T2 and MASDEV_47 :
Evaluation over Austria forAugust 2005
(15 % of physical cost gain)
20070516 20070620 (32 days)ALADIN/AROME S
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20070516 20070620 (32 days)
Ps
RR
Hu2mffV10m
ddV10m
T2m
ALADIN/AROME Scores (32 days FRAN domain)
AROME
ALADIN
RMSE
Biais
Double
pain ?
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Arome REF
Arome NO DifHor
T and wind near the surface
Mso-NH
Arome Hydro
Over-estimated downdrafts (April 11th 2007)
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Arome REF
Arome NO DifHor
Instantaneous rainfalls
Mso-NH
Arome Hydro
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Arome REF
Arome NO DifHor
Wind strength near surface
Mso-NH
Arome Hydro
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New shallow convection scheme : EDKF
- Motivation : improve representation of stratocumulus ansshallow cumulus.
-Mass flux formulation (Malardel Masson, Soares et al. 2004)
with subgrid autoconversion. Independant from turbulencescheme.
-Validated on 1d cases (Wangara, Ayotte), and in some 3dcases in AROME and MesoNH, with some CLOUDNET datas
over Cabauw.- Updraft comparison with RACMO (KNMI)
- Will be used in AROME daily runs in one month when merged
to the recent CY32T3.
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T2m Paulson
SBL laws
Surface scores
Sol
Last model level(17m)
Ta
Ts
T2m Geleyn
Actually :
N2M=2
(toocold)
N2M=1
(toohot)
Sol
Ta
Ts
SBL CANOPY scheme (Masson and Ramdi)
6 added levels andturb scheme in surfex
Evaluation on July 2007 and January2007 on South East France domain :
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T2m
Canopy(blue)
Ref (pink)
Stationsz>300m
Stationsz
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Hu2m
Canopy(blue)
Ref (pink)
Stationsz>300m
Stationsz
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FF V10m
Canopy(blue)
Ref (pink)
Stationsz>300m
Stationsz
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Behaviour over sea (5th August 2007)
Wind gusts (new AROME diagnostic based on TKE, available since
CY32T2) too strong associated with a unrealistic convective systemstarting from spain and moving over the bay of Biscay.
Other cases reported by Hirlam over Baltic sea.
Still under investigations
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Conclusion and outlook
-AROME is on the way for an operationnal use at Meteo-France by october 2008
-New surface diagnostics has been developped and will continue to be evaluated onFRAN domain.
-Statistical formulation of precipitations sedimentations saves computer time
-EDKF convection scheme will replace KFB scheme soon
-Remaining problems are under investigation (numerical diffusion setting,behaviour over sea)
- Evaluation of the model will continue with more interaction with forecasters
- Training of forecasters on how to use the model in spring 2008
- Test of hail (available in MASDEV_47 Meso-NH physics)
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MAP-DPHASE and COPS
- International experiment since 1st June 2007 (to 30 November 2007 for MAP-
DPHASE)
COPS
DPHA
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Chemistry scheme
- MesoNH Chemistryscheme OK in AROME
(P.Tulet)
- interactive CO2 (C. Sarat, P.Tulet)
- Dusts (evaluation on AMMA)
CO2
HNO3
Dusts :MesoNH
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Val dIsre 2009
- AROME 1km : Val dIsre 2009(support to world skiing championship)
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Thank you for your
attention !Yann Seity, Pierre Brousseau, Thibaut Montmerle, Gwennalle
Hello, Sylvie Malardel,Valry Masson, Yves Bidet, PatrickSanturette ( Mto-France)
29th EWGLAM meeting, Dubrovnik, October 2007
Assimilation of Doppler radar winds
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Assimilation of Doppler radar winds
AROME Assim-Doppler AROME Assim AROME-AD
Observations
AROME Assim green
AROME Assim Doppler
AROME AD
AROME Assim Doppler