1. Data assimilation in Austria
Florian Meier, Xin Yan, Stefan Schneider, Christoph Wittmann, Yong Wang

2. 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. 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. Verification: upper air fields
(Präsentation)
Folie 4
RMSE
500hPa
wind
temperature
850hPa
temperature
wind
Zeitraum 11/2010

5. 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

6. Bias 850 hPa 20101005-20101025 old new temperature wind
Old vs new cycle
Bias 850 hPa
old
new
temperature
wind
relative humidity
geopotential

7. Bias 500 hPa 20101005-20101025 temperature old wind new
Old vs new cycle
Bias 500 hPa
temperature
old
wind
new
relative humidity
geopotential

8. RMSE 850 hPa 20101005-20101025 old temperature wind new
Old vs new cycle
RMSE 850 hPa
old
temperature
wind
new
relative humidity
geopotential

9. RMSE 500 hPa 20101005-20101025 old temperature wind new
Old vs new cycle
RMSE 500 hPa
old
temperature
wind
new
relative humidity
geopotential

10. 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

11. Surface stations used in 3D-Var
RH2m
T2m

12. 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 =

13. 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.

14. 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

15. 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. 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

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

18. „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

19. CANARI || 3D-Var vs CANARI->3D-Var
BIAS
RMSE
geopotential T

20. CANARI || 3D-Var vs CANARI->3D-Var
BIAS
RMSE
Rel. humi.
wind

21. 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. 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

24. Case studies

25. Case study: squall line 29.5.2010

26. Case study: squall line 29.5.2010 +03h
(Präsentation)
Folie 26
CANARI only
without assimilation
CANARI+3D-var

27. Case study: squall line 29.5.2010 +06h
(Präsentation)
(Präsentation)
Folie 27
Folie 27
CANARI only
without assimilation
CANARI+3D-var

28. Case study: squall line 29.5.2010 +09h
(Präsentation)
(Präsentation)
Folie 28
Folie 28
CANARI only
without assimilation
CANARI+3D-var

29. Case study: squall line 29.5.2010 +12h
(Präsentation)
(Präsentation)
Folie 29
Folie 29
CANARI only
without assimilation
CANARI+3D-var

30. Case study: Low stratus at 1st March 2011 00 UTC

31. 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

32. Case study: Low stratus at 1st March 2011 00 UTC
no inversion
ALADIN-AUSTRIA
ALADIN+3DVAR+CANARI
ALARO5+CANARI

33. Heavy rain +Thunderstorm over Vienna 8th June 2011
82mm/12h in Vienna centre
44mm/30min UTC

34. ALADIN_AUSTRIA ALARO5 ALADIN-ASSIM
Heavy rain +Thunderstorm over Vienna 8th June 2011
ALADIN_AUSTRIA
ALARO5
ALADIN-ASSIM

35. Case study squall line on 23rd July 2009
radar 20 UTC

36. 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

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