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

Zentralanstalt für Meteorologie und Geodynamik

Data assimilation in Austria

Florian Meier, Xin Yan, Stefan Schneider, Christoph Wittmann, Yong Wang


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


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 2011 -> linear truncation more levels in low atmosphere

Case studies: 29.5.2010 (Hungary) ; 28.2-1.3.2011 (stratus) Vertical background correlation function in CANARI Some OSE, tests on GPS, new B-Matrix, snow analysis


Verification: upper air fields

04/10/23(Präsentation)

Folie 4

temperature wind500hPa

windtemperature

850hPa

RMSE

Zeitraum 11/2010


Verification: screenlevel fields and precipitation


Folie 5

without assimilationwith assimilation

--

+

RH2m

precipitation

T2m

BIAS

RMSE

MAE

RMSE

MAE

BIAS

S A L S A L

Zeitraum 11/2010


Old vs new cycleBias 850 hPa

temperature wind

relative humidity

oldnew

geopotential

20101005-20101025


Old vs new cycleBias 500 hPa

temperature

wind

relative humidity

old

new

geopotential

20101005-20101025


Old vs new cycleRMSE 850 hPa

temperature wind

relative humidity

oldnew

geopotential

20101005-20101025


Old vs new cycleRMSE 500 hPa

temperature wind

relative humidity

oldnew

geopotential

20101005-20101025


OLD vs new cycle

OPER ASSIM old

OPER ASSIM new

MSLP

stations 0-500m 20101101-20101130 00 UTC-runs

OPER ASSIM old

OPER ASSIM new

T2m


Surface stations used in 3D-Var

T2m RH2m


Double observations from OPLACE/local data basein CANARI (visit of M. Bellus (SK) in Vienna)

filtered beforeBATOR

not filtered beforeBATOR

ZAMG->OPLACEOPLACE->ZAMGTs-increments

=

obsoul__merge.pl

16261631

22982298


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.)

)1

*)ln(*5.0()2

2

*5.0(

*),( cPjpip

d

ijr

eepr

d=45km, Pc=0.05 set in namelist

referenced=60km

Ts standard CANARI Ts CANARI +vert. corr.


positive effect on T2m especially for stations between 500-1500m, mslp slightly worse, other parameters more or less neutral

Modification of CANARI background error statistics

T2m

T2m

RH2m

RH2m

MSLP500-1000m

1000-1500m

vert. corr.reference


Assimilation of ASCAT 10m winds (25km resolution)

12,5km ASCAT wind data lead to crash in bator_decodbufr

ascat_20110610_082332_metopa_24076_ear_o_250_ovw.l2_bufr.gz


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


RCSNSY=2.5RCSNSY=200.

Snow analysis in CANARI

problems: no 0 observations, no obs. over Switzerand and France, quality control -> station 16227


„Impact of several observation systems“ 04/10/23(Präsentation)

Folie 18

SY

NO

P

AM

DA

R

TE

MP

SE

VIR

I

ME

TO

P/N

OA

A19

AM

SU

-B GP

S

AM

SU

-A

GE

OW

IND

HIR

S

Impact of new satellite data NOAA19+Metop on temperature RMSE

Method following Storto und Randriamampianina 2010


CANARI || 3D-Var vs CANARI->3D-Var

geopotential

RMSEBIAS

T


CANARI || 3D-Var vs CANARI->3D-Var

BIAS

Rel. humi.

RMSE

wind


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?


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



Case studies


Case study: squall line 29.5.2010



Folie 26

without assimilation CANARI+3D-var

Case study: squall line 29.5.2010 +03h

CANARI only



Folie 27



Folie 27

CANARI only

CANARI+3D-varwithout assimilation



Folie 28



Folie 28

CANARI only




Folie 29



Folie 29

CANARI only



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



Folie 31

ALADIN-Austria +24h ALADIN assim +24h


ALARO5 +24h



ALADIN+3DVAR+CANARI ALARO5+CANARI

ALADIN-AUSTRIA

no inversion


Heavy rain +Thunderstorm over Vienna 8th June 2011

82mm/12h in Vienna centre44mm/30min 11.30-12.00 UTC


Heavy rain +Thunderstorm over Vienna 8th June 2011

ALADIN_AUSTRIA

ALADIN-ASSIMALARO5


radar 20 UTC

Case study squall line on 23rd July 2009


Case study squall line on 23rd July 2009

Niederschlag 18.00-21.00 UTC

INCA-analysis

CANARI+3DVAR 3DVAR+GPS SURFEX+ASCAT

23rd July 00 UTC run: precipitation 18 UTC - 21 UTC

OPER



Increments ALARO5-CANARI: surface temperature

standard CANARI withoutvertical correlation of background errorfor T2m, RH2m

modified CANARI version withvertical correlation of background errorfor T2m, RH2m


Documents

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