AROME Weather Model - A Search for the Future
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- Diana Greer
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1 Status of AROME news since Bratislava '05 based on contributions from CNRM GMAP & GMME teams,lab. Aérologie, aladinists 1. System & workforce 2. Model & software 3. Assimilation 4. The Future 1
2 1. Multiscale NWP in 2007/2008 AROME on small domains resolution 2.5km forecast ranges 1-24h + nowcasting coupling ALADIN/ALARO on big domains resolution close to 10km forecast ranges 6-48h + ensembles coupling ARPEGE global resolution 15km (T539) ranges up to 3 days + ensembles ECMWF's IFS resolution 25km, up to 7 days + ensembles 2
3 ARPEGE forecast quality, lately in 2006: L46, much improved radiation & clouds (see Y. Bouteloup's talk) erreurs France temps
4 No global model is always the best erreurs best: France best: ECMWF best: France temps mars 2006 avril
5 System & workforce Arome NWP-oriented modelling: mostly in GMAP team: embedding (clim files, 927, postprocessing, DDH diags, Surfex interfacing, APLXXX interface), case studies with forecasters. see talk by G. Hello & JD. Gril, T. Kovacic Arome assimilation: common with ALADIN 3DVar, plus radar work. Arome upstream R&D: mostly in GMME. Current priority on improving clouds (shallow convection, 3MT, fog) and SURFEX. see talks by S. Malardel, E. Martin, L. Kraljevic the rest of NWP in Toulouse: roughly 10% on ARPEGE/ALADIN, 10% on AROME/MésoNH, 80% on transversal activities (software, assimilation, Aladin support) - see P. Pottier's statistics and Aladin web site Aladin partners' contribution: NH cleaning, code phasing, phys/dyn interfacing. Most Aladin work is good for Arome. e.g. see talk by J. Vivoda Increasing deported testing of Arome in several Aladin & Hirlam centres (Denmark, Sweden, Finland, Norway, Hungary, Austria, Czech Rep...) see talk by L. Kullmann 5
6 Sweden : 270x288, 2.5km,?L Finlande : 384x324, 2.5km,?L Danemark : 400x384, 2.5km,?L 6
7 New Arome domains Hungary (Laszlo Kullmann) : on IBM regatta at Budapest. 7
8 2. Model work Prototype is fully included in the joint cycles (with MésoNH & SURFEX bits) and available at ECMWF (gmkpack) see talk by Ryad El Khatib One year of successful daily runs over various weather types, tests on ocean, T1 storm, snowstorms, AMMA, precipitation studies... Thematic studies on fog, ocean fluxes, wind power, shallow clouds, snowfalls, mountain weather activated use of SLHD (still tricky dyn in deep valleys) activated subgrid cloudiness activated KFB shallow convection (still needs improvement) developed flux budget diagnostics, Arome FullPOS, developed full interactive chemistry, dust & aerosols option bugfixes on soil initialization, physiographies, NH cleaning 8
9 Resolved convection in Arome ( , 15 à 18h UTC) couleurs: glace, eau nuageuse, pluie 9
10 Winter synoptic weather: ALADIN (top) vs AROME (bottom) radar mm/h 10
11 Real-time AROME forecast of isolated thunderstorm (27/6/2005) Pluies vues par les radars AROME ALADIN 11
12 Mediterranean flash flood event on 6/9/2005 prévision ALADIN observations raingauges prévision AROME observations radar 12
13 Verification: Hydrological validation 1-month precip over Austria (work done with ZAMG) Observations Prévisions ALADIN CEN SOR ED! se e t alks b E. Ba y zile & T. H a iden Prévisions AROME (prototype) 13
14 T2m validation on ALADIN (left) and AROME (right) 21 Montpellier vérité terrain Better in valleys, on mountains, in big cities 14
15 T/wind in mountain regions (Alps) Températures d'aladin Températures d'arome Genève Lyon Genève Lyon 15
16 Better wind modelling: application on forest fires, pollution events, air quality, coastal ocean modelling, air Marseille traffic safety Nice Aladin Arome Nice Marseille 16
17 New AROME product: 3D TKE with NH effects Nice Marseille Turbulence at 140m above ground z vertical cross-section Nord Sud 17
18 Validation of fog forecast by AROME Arome low cloud cover 11 nov Humidity Arome MSG satellite 11 janv ( communication Y. Seity et G. Hello, )
19 Fog sensitivity to the aerosol specification (research tests with Méso-NH & ORILAM physics) Cloud liq water Z(m) stratus countryside aerosols fog Z(m) Cloud liq water urban aerosols (communication P. Tulet)
20 Air pollution : ESCOMPTE field exp. (AROME/CHEMISTRY) NOx O3 Low-level fields : 24 June 2001 at 14 UTC (38 hours of simulation) 20 Tulet et Seity, 2006
21 3. Assimilation work ALADIN 3DVar now operational in France, Hungary, Africa, proven beneficial impact see C. Fischer hybrid Méso-NH/3DVar assimilation tests on Mediterranean convection showed good behaviour but need to improve Jb successful Arome 3DVar 2.5km hourly assimilation tests show very good impact, even with fixed obs network 3DVar diagnostic analysis, hi-res in PBL. Supersedes CANARI need to calibrate 2.5km native Jb using ensemble of Arome runs radar reflectivity work is proceeding: Bayesian inversion technique, work on data management growing Doppler radar team in Toulouse. Screening works. ground zenithal GPS assimilation works. more work planned on scripts (OLIVE interface), high-resolution use of radiances, bogus cloud data. (P. Brousseau, E. Sevault) 21
22 Conceptual model of data assimilation for convective scales Hydrométéors PBL 22
23 no assimilation observations Impact of 3DVar assimilation on ALADIN forecasts: frontal convection only works if enough hi-res obs e.g. radiances with assimilation assim with Météosat radiances see talk by C.Fischer etc. 2004/07/18 12UTC RR P12 P6 23
24 4-h extreme precip forecasts: impact of assimilation pluies du modèle Arome no assimilation vérité radar forecast with assimilation 24
25 Quikscat wind assimilation enpink: rose: observation reçues observations, received active enblack: noir:observations, obs. sélectionnées horizontal increment of wind speed blue: guess red: analysis vertical increment xsect z x 25
26 Doppler radar observation operator: radial wind component in the PBL observed ALADIN guess 26
27 4. The future (i.e. 2006/2007) computer optimization (NEC, IBM, Linux) data assimilation: used for all daily runs, compute improved Jb short-range hourly forecasts for nowcasting test of Saharian dust modelling & SURFEX advanced features increase vertical resolution for fog & low clouds even more coupling file compression even more work on radar & satellite cloud data continuing phys/dyn interface cleaning (for all new devs.) development of 3MT deep convection with ALARO (see L Gérard) improvement of Soares EDMF new shallow convection critical review of all physics schemes & more verification preparing the post-arome work: adaptive discretization, vertical slopes, 3D turbulence, interactive gridnesting, better large-scale coupling, mesoscale predictability, 4DVar/KF, toolbox of physics, merge with ALARO & HARMONIE? 27
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