09 11-yann seitty-arome status

7/28/2019 09 11-Yann Seitty-AROME Status

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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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Examples of good AROME forecasts



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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



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31 May 2006 : 18 UTC



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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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Example of good AROME forecasts



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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

09 11-yann seitty-arome status

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