AROME_WMED for HyMeX

M.Nuret, N. Fourrié, E. Bresson,

C. Jany, P. Brousseau, A. Doerenbecher

and colleagues

Météo-France / CNRM-GAME

AROME_WMED

AROME_WMED = special versionof the operational model AROME_Francefor the HyMeX field campaign.

• non hydrostatic, 2.5km resolution• assimilation cycle = 3h• boundary conditions = ARPEGE global model

AROME_WMED (periods)

AWM_OPER X (+48h) X(+48h) X(+48h)

AWM_REANA_1 X(+54h)

AWM_REANA_2 X(+54h) ?* ?*

SOP1(5/9/2012-6/11/2012)

Inter-SOP SOP2(1/2/2013-15/3/2013)

+ AROME_France oper. (+30hr)

* if extra manpower available

AROME_WMED (cycles)

AWM_OPER 36t2/37t125/09/2012

03UTC06UTC

37t1 37t1

AWM_REANA_1 37t1

AWM_REANA_2 38t1

SOP1(5/9/2012-6/11/2012)

Inter-SOP SOP2(1/2/2013-15/3/2013)

• OPER : Jb_1• REANA1 : Jb_1• REANA2 : Jb_2

Jb_1: computed on a convective case from autumn 2010, ensemble method, 6 perturbed members (36t2)

Jb_2: to be computed on a period from SOP1 (autumn 2012),ensemble method, to be defined …

AROME_WMED_oper (Jb)

AROME_WMED_oper (Jb)Variance-covariance matrix of the guess error (= forecast range +3hr) = Jb

• 1000hpa~10km

• 500 hPa~15km

From:Fourrié et al.,

AROME_WMED (coupling)

• OPER : ARPEGE  court   cy36t2 then cy37t1• REANA1 : ARPEGE  production  cy36t2 then cy37t1• REANA2 : ARPEGE  production  cy36t2 then cy37t1

Impact of the coupling is under investigation ( court vs production)

AROME_WMED_oper (relief)

• Orography difference AWM_oper – AROME_FRANCE average 27.56m (- 0.16°C for T2m)(relief AWM_oper = relief ½ envelop)

relief AWM_reana1 = relief AWM_oper

AROME_WMED_oper (observations)

• AWM_oper vs AROME_France:• basically, the same incoming observation flux • GPS more (+) data vs pré-HYMEX period, but less (–) datain AWM_oper vs AROME_France (bias correction scheme issue)• BAMED balloons (V and T)• RS/4M supplementary HYMEX (since mid-October, BUFR/ASCII issue) in TEMP format• RS KIT (Corse) all taken into account (TEMP format) • Wind Profiler: for SOP1 available from mid october (only Pierrelattetaken into account, then 5 sites for SOP2 after monitoring)

Specific to AWM_oper (vs AROME_France):• Spanish surface data: more SYNOP• Polar orbiting radiances (AMSU): thinning improved (125km => 80km)

AROME_WMED_oper (observations)

• AWM_oper vs AROME_France: nombre d’observations (messages)

AROME_WMED_oper: evaluation• AWM_oper :

• real time suite on NEC (TORI, old computer, computation nodes failures, constraints..) with real time monitoring• AROME_WMED +48h forecasts on 00UTC slot available~ 04.30UTC => forecast bulletin ~ 07.00UTC• many technical issues:

• real time archiving issues• cycle change• too much radar observations (5/11/2012)• observation extraction

95% of the forecats on time (SOP1), 93% (SOP2)

AROME_WMED_oper: evaluationT2m

HU2m

Tb IR

Wind(gust)

SOP1

AROME_WMED_oper: evaluation

SOP1 SOP2

Rain

AROME_WMED_oper: evaluationIOP8 28/09-00UTC to 29/09-00UTC 29/09-00UTC to 30/09-00UTC

OBS

+24hr

+48hr

AROME_WMED_oper: conclusion

• AROME_WMED_oper performance is at least similar toAROME_France, even better for some IOPs (8, 15b) concerning rain

• weak cold 2m temperature bias (orography difference)

• GPS bias correction issue

• AROME_WMED oper and reana1 simulations available on the HyMeX database

AROME_WMED_reana1• AWM_rena1 vs AWM_oper:

=> observations• observations re-extracted (no cut-off constraint)• + spanish SYNOPs [5/9/2012 – 4/10/2012]• Hu from balloon BAMED• + wind profiler (only Pierrelatte was assimilated in oper. for SOP1):Pierrelatte+Cld-Ferrand+Candillargues+Perpignan+Marignanne,availability on GTS mid October.• RS/4M before 10 October 2012 in TEMP format

=> configuration • unique cycle (37t1)• forecast maximum range :+54h• coupling: ARPEGE production• period: SOP1

AROME_WMED_reana1• BAMED balloon: ~ 400 observations (Hu)•Wind profiler: +64% • Radiosonde: +4%• Synop: +2%

QPF: impact>0 1st period, neutral 2nd period: is cycle changethe dominant effect?

SOP1

AROME_WMED_reana1Pm

er(H

pa)

Échéance(h) Échéance(h)

Hum

idité

(%)

FF(m

/s)

Échéance(h)

DD

(°)

Échéance(h)

T2m

(°)

Échéance(h)Échéance(h)

Néb

ulos

ité(%

)

AROME_WMED_REANA1 vs AROME_WMED_OPER(validation against surface data = SYNOP)

=> neutral impact

AROME_WMED_reana1AROME_WMED_REANA1 vs AROME_WMED_OPER

(validation against surface data = buoy)

neutral impact

From Rainaud R. et al.: « Air-sea exchanges over the Western Mediterranean Sea during the HyMeX SOP1 using the AROME-WMED model », submitted to QJRMS, May 2014.

AROME_WMED_reana1

Échéance(h)

AROME_WMED_REANA1 vs AROME_WMED_OPER(validation against upper-air data = RS)

=> neutral impact

Eqm Ect |Biais|

Pres

sion

(hP a

)

Géopotential Température

Humidité Wind Speed

AROME_WMED_reana1AROME_WMED_REANA1 vs AROME_WMED_OPER

(validation against integrated data = IWV GPS)

=> positive impactHumidity

Échéance(h)Réseau (UTC)

IWV

(mm

)

Cor

réla

tion

IWV IWV

Réseau validationGPS

AROME_WMED_reana1AROME_WMED_REANA1 vs AROME_WMED_OPER

(validation against upper air data = F20 dropsondes)

=> weak positive impact

Réseau (UTC)

Validation networkdropsondes F20

(35 dropsondes, ~4000 données)C

orré

lati

onM

odèl

e-ob

serv

atio

n(%

)

AROME_WMED_reana1: conclusion

• overall quality of AROME_WMED_oper and AROME_WMED_reana1 is similar

• more data, but no significative improvement, except maybe a weak signal in QPF during the 1st period (before 25/09/2012) – maybe as a result of the conjunction of more data and cycle upgrade

AROME_WMED_reana2• new 38t1cycle on new machine BULL (oper. since 14/01/2014)

• doppler winds from Mt Maurel, more SEVIRI radiances over land,more IASI channels, σo tuned, orography, …

• new orography (same as AROME_France oper. which is new in cy38)• new Jb• enhanced observations flux vs AROME_WMED_reana1:

high resolution radiosounding (France, Espagne, RS/4M,KIT, L’Aquilla, Biscarosse)dropsondes F20reprocessed GPS and biais correction scheme adaptedreprocessed wind profilersground-based lidar (Candillargues, Minorque) + airborneresearch aircraft measurements (F20, ATR, Dornier)spanish radarsurface stations (Candillargues, …)…

LIDAR BASIL

Quality control issues …

AROME_WMED_reana2Work in progress:

• AROME_WMED cy38 run with Jb_1 and AROME_WMED_reana1observational dataset for SOP1 (« control » run)• evaluation of the coupling strategy • preparation of the observations files, tests

Expected agenda:• Jb_2 : june 2014• Tests : summer / autumn 2014• Availability : mid-2015 (M45)

AROME_WMED_reana2

• Questions, comments?

CY38