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Zentralanstalt für Meteorologie und Geodynamik Data assimilation in Austria Florian Meier, Xin Yan, Stefan Schneider, Christoph Wittmann, Yong Wang.

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Presentation on theme: "Zentralanstalt für Meteorologie und Geodynamik Data assimilation in Austria Florian Meier, Xin Yan, Stefan Schneider, Christoph Wittmann, Yong Wang."— Presentation transcript:

1 Zentralanstalt für Meteorologie und Geodynamik Data assimilation in Austria Florian Meier, Xin Yan, Stefan Schneider, Christoph Wittmann, Yong Wang

2 Zentralanstalt für Meteorologie und Geodynamik Assimilation system: ALADIN-Austria parallel run Coupling with ARPEGE forecasts (3h coupling interval) Forecast: 00 UTC +72h, 6h-assimilation cycle Domain: 300x270 grid points; 9.6 km horizontal resolution; 60 layers cy35t1: 001,927,fullpos cy36t1: BATOR, CANARI, SCREENING, MINIMIZATION, BLEND, BLENDSUR Calculations at ZAMG; NEC SX8 Controlled by kornshell scripts (5 masterscripts + templates) no SMS

3 Zentralanstalt für Meteorologie und Geodynamik Activities since last meeting in Ljubljana Change from CANARI || 3D-Var to CANARI->3D-Var Additional assimilation step at 03 UTC abandoned Blacklists from MF Assimilation cy32t1->cy36t1 (since January 2011) Satellite data change from obsoul to bufr / grib Change from static BC to VarBC More satellite data: SEVIRI, HIRS, NOAA19, METOP, ASCAT SYNOP from ZAMG+OPLACE (->more stations in HU + CH) ALARO5 with CANARI+ECMWF lagged coupling operational since March > linear truncation more levels in low atmosphere Case studies: (Hungary) ; (stratus) Vertical background correlation function in CANARI Some OSE, tests on GPS, new B-Matrix, snow analysis

4 Zentralanstalt für Meteorologie und Geodynamik Verification: upper air fields (Präsentation) Folie 4 temperature wind 500hPa wind temperature 850hPa RMSE Zeitraum 11/2010

5 Zentralanstalt für Meteorologie und Geodynamik Verification: screenlevel fields and precipitation (Präsentation) Folie 5 without assimilation with assimilation -- + RH2m precipitation T2m BIAS RMSE MAE RMSE MAE BIAS S A L Zeitraum 11/2010

6 Zentralanstalt für Meteorologie und Geodynamik Old vs new cycle Bias 850 hPa temperature wind relative humidity old new geopotential

7 Zentralanstalt für Meteorologie und Geodynamik Old vs new cycle Bias 500 hPa temperature wind relative humidity old new geopotential

8 Zentralanstalt für Meteorologie und Geodynamik Old vs new cycle RMSE 850 hPa temperature wind relative humidity old new geopotential

9 Zentralanstalt für Meteorologie und Geodynamik Old vs new cycle RMSE 500 hPa temperature wind relative humidity old new geopotential

10 Zentralanstalt für Meteorologie und Geodynamik OLD vs new cycle OPER ASSIM old OPER ASSIM new MSLP stations 0-500m UTC-runs OPER ASSIM old OPER ASSIM new T2m

11 Zentralanstalt für Meteorologie und Geodynamik Surface stations used in 3D-Var T2m RH2m

12 Zentralanstalt für Meteorologie und Geodynamik Double observations from OPLACE/local data base in CANARI (visit of M. Bellus (SK) in Vienna) filtered before BATOR not filtered beforeBATOR ZAMG->OPLACEOPLACE->ZAMG Ts-increments = obsoul__merge.pl

13 Zentralanstalt für Meteorologie und Geodynamik Modification of CANARI background error statistics CANARI increments are quite smooth especially in Alpine areas and even in ALARO5 -> reduction of background horizontal correlation length and introduction of vertical correlation function as already existing for snow analysis also for T2m, RH2m in catrma und cacova (LCORRF=.TRUE.) d=45km, P c =0.05 set in namelist reference d=60km Ts standard CANARITs CANARI +vert. corr.

14 Zentralanstalt für Meteorologie und Geodynamik positive effect on T2m especially for stations between m, mslp slightly worse, other parameters more or less neutral Modification of CANARI background error statistics T2m RH2m MSLP m m vert. corr. reference

15 Zentralanstalt für Meteorologie und Geodynamik Assimilation of ASCAT 10m winds (25km resolution) 12,5km ASCAT wind data lead to crash in bator_decodbufr ascat_ _082332_metopa_24076_ear_o_250_ovw.l2_bufr.gz

16 Zentralanstalt für Meteorologie und Geodynamik Snow analysis in CANARI Some tests only with surface station data from ZAMG database Modification of namelist and routines hop.F90, bator_ecritures_mod.F90 REF_A_SN=50km, REF_S_SN=5., REF_AP_SN=0.02 RCSNSY=200. RCSNSY=2.5

17 Zentralanstalt für Meteorologie und Geodynamik RCSNSY=2.5 RCSNSY=200. Snow analysis in CANARI problems: no 0 observations, no obs. over Switzerand and France, quality control -> station 16227

18 Zentralanstalt für Meteorologie und Geodynamik Impact of several observation systems (Präsentation) Folie 18 SYNOP AMDAR TEMP SEVIRI METOP/NOAA19 AMSU-B GPS AMSU-A GEOWIND HIRS Impact of new satellite data NOAA19+Metop on temperature RMSE Method following Storto und Randriamampianina 2010

19 Zentralanstalt für Meteorologie und Geodynamik CANARI || 3D-Var vs CANARI->3D-Var geopotential RMSE BIAS T

20 Zentralanstalt für Meteorologie und Geodynamik CANARI || 3D-Var vs CANARI->3D-Var BIAS Rel. humi. RMSE wind

21 Zentralanstalt für Meteorologie und Geodynamik Outlook: Less resources at ZAMG for data assimilation in the future Parallel run will probably be switched off soon Focus on AROME with some assimilation part (RUC+FGAT ASCAT soil moisture kalman filter) Maybe some time for testing new observations (Metop IASI, AIRS, SSMIS) CANARI vertical correlation in ALARO5?

22 Zentralanstalt für Meteorologie und Geodynamik Proposals of last meeting Done: New aladin cycle CANARI ->3D-Var instaed of || 03 UTC step abandoned 5km linear truncation and orography in ALARO5 (no 3D-Var yet) some experiments with CANARI background correlation Not done: Tuning of o, b Channel selection of satellite data 5km-B-matrix IDFI

23 Zentralanstalt für Meteorologie und Geodynamik

24 Case studies

25 Zentralanstalt für Meteorologie und Geodynamik Case study: squall line

26 Zentralanstalt für Meteorologie und Geodynamik (Präsentation) Folie 26 without assimilationCANARI+3D-var Case study: squall line h CANARI only

27 Zentralanstalt für Meteorologie und Geodynamik (Präsentation) Folie 27 Case study: squall line h (Präsentation) Folie 27 CANARI only CANARI+3D-varwithout assimilation

28 Zentralanstalt für Meteorologie und Geodynamik (Präsentation) Folie 28 Case study: squall line h (Präsentation) Folie 28 CANARI only CANARI+3D-varwithout assimilation

29 Zentralanstalt für Meteorologie und Geodynamik (Präsentation) Folie 29 Case study: squall line h (Präsentation) Folie 29 CANARI only CANARI+3D-varwithout assimilation

30 Zentralanstalt für Meteorologie und Geodynamik Case study: Low stratus at 1st March UTC

31 Zentralanstalt für Meteorologie und Geodynamik (Präsentation) Folie 31 ALADIN-Austria +24hALADIN assim +24h Case study: Low stratus at 1st March UTC ALARO5 +24h

32 Zentralanstalt für Meteorologie und Geodynamik Case study: Low stratus at 1st March UTC ALADIN+3DVAR+CANARI ALARO5+CANARI ALADIN-AUSTRIA no inversion

33 Zentralanstalt für Meteorologie und Geodynamik Heavy rain +Thunderstorm over Vienna 8th June mm/12h in Vienna centre 44mm/30min UTC

34 Zentralanstalt für Meteorologie und Geodynamik Heavy rain +Thunderstorm over Vienna 8th June 2011 ALADIN_AUSTRIA ALADIN-ASSIMALARO5

35 Zentralanstalt für Meteorologie und Geodynamik radar 20 UTC Case study squall line on 23rd July 2009

36 Zentralanstalt für Meteorologie und Geodynamik Case study squall line on 23rd July 2009 Niederschlag UTC INCA-analysis CANARI+3DVAR 3DVAR+GPS SURFEX+ASCAT 23rd July 00 UTC run: precipitation 18 UTC - 21 UTC OPER

37 Zentralanstalt für Meteorologie und Geodynamik

38 Increments ALARO5-CANARI: surface temperature standard CANARI without vertical correlation of background error for T2m, RH2m modified CANARI version with vertical correlation of background error for T2m, RH2m

39 Zentralanstalt für Meteorologie und Geodynamik


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