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Data assimilation in Austria
Florian Meier, Xin Yan, Stefan Schneider, Christoph Wittmann, Yong Wang
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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
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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
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Verification: upper air fields
(Präsentation) Folie 4 RMSE 500hPa wind temperature 850hPa temperature wind Zeitraum 11/2010
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Verification: screenlevel fields and precipitation
(Präsentation) Folie 5 precipitation RMSE MAE -- BIAS RH2m RMSE + MAE S A L S A L T2m without assimilation with assimilation BIAS Zeitraum 11/2010
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Bias 850 hPa 20101005-20101025 old new temperature wind
Old vs new cycle Bias 850 hPa old new temperature wind relative humidity geopotential
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Bias 500 hPa 20101005-20101025 temperature old wind new
Old vs new cycle Bias 500 hPa temperature old wind new relative humidity geopotential
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RMSE 850 hPa 20101005-20101025 old temperature wind new
Old vs new cycle RMSE 850 hPa old temperature wind new relative humidity geopotential
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RMSE 500 hPa 20101005-20101025 old temperature wind new
Old vs new cycle RMSE 500 hPa old temperature wind new relative humidity geopotential
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T2m OLD vs new cycle stations 0-500m 20101101-20101130 00 UTC-runs
MSLP OPER ASSIM new OPER ASSIM old T2m OPER ASSIM old OPER ASSIM new
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Surface stations used in 3D-Var
RH2m T2m
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1631 1626 obsoul__merge.pl Ts-increments 2298 2298 =
Double observations from OPLACE/local data base in CANARI (visit of M. Bellus (SK) in Vienna) filtered before BATOR 1631 1626 Ts-increments OPLACE->ZAMG ZAMG->OPLACE obsoul__merge.pl not filtered beforeBATOR 2298 2298 =
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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, Pc=0.05 set in namelist reference d=60km Ts standard CANARI Ts CANARI +vert. corr.
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500-1000m T2m RH2m MSLP vert. corr. reference T2m RH2m 1000-1500m
Modification of CANARI background error statistics positive effect on T2m especially for stations between m, mslp slightly worse, other parameters more or less neutral m T2m RH2m MSLP vert. corr. reference T2m RH2m m
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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
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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 RCSNSY=200. RCSNSY=2.5 REF_A_SN=50km, REF_S_SN=5. , REF_AP_SN=0.02
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Snow analysis in CANARI
problems: no 0 observations, no obs. over Switzerand and France, quality control -> station 16227 RCSNSY=2.5 RCSNSY=200.
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„Impact of several observation systems“
(Präsentation) Folie 18 Impact of new satellite data NOAA19+Metop on temperature RMSE AMDAR METOP/NOAA19 TEMP AMSU-A GEOWIND AMSU-B SEVIRI HIRS GPS SYNOP Method following Storto und Randriamampianina 2010
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CANARI || 3D-Var vs CANARI->3D-Var
BIAS RMSE geopotential T
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CANARI || 3D-Var vs CANARI->3D-Var
BIAS RMSE Rel. humi. wind
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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?
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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 so, sb Channel selection of satellite data 5km-B-matrix IDFI
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Case studies
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Case study: squall line 29.5.2010
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Case study: squall line 29.5.2010 +03h
(Präsentation) Folie 26 CANARI only without assimilation CANARI+3D-var
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Case study: squall line 29.5.2010 +06h
(Präsentation) (Präsentation) Folie 27 Folie 27 CANARI only without assimilation CANARI+3D-var
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Case study: squall line 29.5.2010 +09h
(Präsentation) (Präsentation) Folie 28 Folie 28 CANARI only without assimilation CANARI+3D-var
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Case study: squall line 29.5.2010 +12h
(Präsentation) (Präsentation) Folie 29 Folie 29 CANARI only without assimilation CANARI+3D-var
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Case study: Low stratus at 1st March 2011 00 UTC
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ALARO5 +24h ALADIN-Austria +24h ALADIN assim +24h
Case study: Low stratus at 1st March UTC (Präsentation) Folie 31 ALARO5 +24h ALADIN-Austria +24h ALADIN assim +24h
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Case study: Low stratus at 1st March 2011 00 UTC
no inversion ALADIN-AUSTRIA ALADIN+3DVAR+CANARI ALARO5+CANARI
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Heavy rain +Thunderstorm over Vienna 8th June 2011
82mm/12h in Vienna centre 44mm/30min UTC
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ALADIN_AUSTRIA ALARO5 ALADIN-ASSIM
Heavy rain +Thunderstorm over Vienna 8th June 2011 ALADIN_AUSTRIA ALARO5 ALADIN-ASSIM
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Case study squall line on 23rd July 2009
radar 20 UTC
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Case study squall line on 23rd July 2009
INCA-analysis OPER 23rd July 00 UTC run: precipitation 18 UTC - 21 UTC 3DVAR+GPS CANARI+3DVAR SURFEX+ASCAT Niederschlag UTC
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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
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