Download - 29th EWGLAM meeting, Dubrovnik, October 2007
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Status of AROME model delelopments
Yann Seity, Pierre Brousseau, Thibaut Montmerle, Gwennaëlle Hello, Sylvie Malardel,Valéry Masson, Yves Bidet,
Patrick Santurette ( Météo-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 ¼ of France since 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 resolutionModel 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%
I nterfaces
12%
Microphysics
15%
Radiation
42%
SL advection
22%
Physics
24%
others
(coupling, FFT,
dynamics…)
20% Communications
34%
Currently being optimized by NEC Ingeneers
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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 : Good structures and maxima localisation, but excessive in terms of intensity.
Cumulative rainfalls :August 23rd 2007
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Foehn over « Massif Central »
HU AROMEFC+12h
Satellite VIS picture
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Frontal precipitation bands (1)
Système frontal dont la structure verticale présente une cassure : en altitude le front se détache de sa partie en basses couches et le front dans les couches moyennes et supérieures (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)
Températures 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
Températures 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. Δtw, qrΔz
Fn
Fn+1 = ?
P1= min (1, w Δt ) (Proportion of the layer falling during dt)
Δz
P2= max (0, 1 - Δz ) (Proportion of Fn falling through the layer during dt )
wΔt
(Yves Bouteloup, JF Geleyn)
Fn+1= P1. ρ.qr.Δz + P2.FnΔt
AROME 60s
AROME Sedim
Before : Eulerian discretisation with time splitting -> costly. Now : in CY32T2 and MASDEV_47 :
Evaluation over Austria for August 2005
(15 % of physical cost gain)
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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
Méso-NH
Arome Hydro
Over-estimated downdrafts (April 11th 2007)
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Arome REF
Arome NO DifHor
Instantaneous rainfalls
Méso-NH
Arome Hydro
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Arome REF
Arome NO DifHor
Wind strength near surface
Méso-NH
Arome Hydro
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New shallow convection scheme : EDKF
- Motivation : improve representation of stratocumulus ans shallow cumulus.
-Mass flux formulation (Malardel Masson, Soares et al. 2004) with subgrid autoconversion. Independant from turbulence scheme.
-Validated on 1d cases (Wangara, Ayotte), and in some 3d cases 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
TsT2m Geleyn
Actually :
N2
M=
2
(too co
ld)
N2
M=
1
(too h
ot)
Sol
Ta
Ts
SBL CANOPY scheme (Masson and Ramdi)
6 added levels and turb scheme in surfex
Evaluation on July 2007 and January 2007 on South East France domain :
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T2m
Canopy (blue)
Ref (pink)
Stations z>300m
Stations z<300m
July 2007 January 2007
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Hu2m
Canopy (blue)
Ref (pink)
Stations z>300m
Stations z<300m
July 2007 January 2007
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FF V10m
Canopy (blue)
Ref (pink)
Stations z>300m
Stations z<300m
July 2007 January 2007
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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 system starting 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 on FRAN 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 Chemistry scheme OK in AROME
(P.Tulet)
- interactive CO2 (C. Sarat, P.Tulet)
- Dusts (evaluation on AMMA)
CO2
HNO3
Dusts : MesoNH
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Val d’Isère 2009
- AROME 1km : Val d’Isère 2009 (support to world skiing championship)
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Thank you for your attention !
Yann Seity, Pierre Brousseau, Thibaut Montmerle, Gwennaëlle Hello, Sylvie Malardel,Valéry Masson, Yves Bidet,
Patrick Santurette ( Météo-France) …
29th EWGLAM meeting, Dubrovnik, October 2007
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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