Dijana Klarić
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Transcript of Dijana Klarić
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RC LACE 26th EWGLAM Meeting 4-6 October 2004, Oslo 1
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RC LACE efforts2nd RC LACE MoU (2003-2005)
Operations & maintenance
Networking
Research & development
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Operations & maintenance
all 6 members - individual operational applications
SK*****
almost the same domains
mesh size (x 12.2km - x 6.5 km)
vertical resolutions (L37 - L45)
envelope - no envelope orography
dyn. adapt; blending; 3DVar (e-suite)
maintenance and porting of SW
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Telecommunications
RETIM2000 vs InternetSatellite dissemination
DVB
bandwidth eq. to 128 kBps link
RETIM 40% budget
as backup to Internet
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Networking (Who? Why? When?)
• Decentralized research & 3 WG• work in AAA environment• training for newcomers and WS • ALADIN -Training on ALADIN-NH, TLS
» March 15-19, 2004
• SRNWP - 2nd WS on Verification, De Bilt » June 14-15, 2004
• actions: LACE WWW pages and FTP server
coordinated verifications
list of cases, MAP
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Verification project
ALADIN Project organized by Sloveniastarted 2002aims:
to unify the verification on synoptic scaleto impose the international standardsto reduce duplication of workto compare different ALADIN at the same domainenvironment toward meso-scale verification
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Verification project
• Prototype
• station list 348 +74
ECMWFTM 430
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DB of Case Studies
Data base of cases
Short description Event date Category CForecast &Report
Cold front 2003-12-22 Cold frontHR Forecast
Deep cyclone over BlackSea
2003-09-13 Sever weather RO,BLForecasts
Tornado 2003-08-30 14UTCNot forecastedTornado
HR Forecast
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MAP SOP cases
• ECMWF Re-analysis of MAP SOP• different surface parameterization in
ARPEGE• “Proper downscaling of
ECMWF re-analysis”• work performed by LACE Data Manager
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Scientific Plan 2003/2004
2nd RC LACE Steering Committee meeting
2003• Plans from year 2003 were fulfilled• 98 person/months
2004• to work on opened subjects• to adjust R&D to AAA plans• to learn meso-NH physics ?
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Scientific Plantoward AAA compatibility
• Dynamics• NH ALADIN is numerical core of AAA• interfacing dynamics vs. physics is in focus
• Physics• physics for different scales 10km, 5km, 2.5 km• various schemas and SW• up-scaling or downscaling approach
• Data Assimilation• more non-classical observations
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Working Group for Dynamics and Coupling
. Non-hydrostatic dynamicsInterative schemes
Choice of additional NH variables
Bottom boundary condition
Finalization of NH Dynamics
Diabatism in NH
. Dynamics – other topicsHorizontal diffusion (SLHD)
Radiative UBC
Physics/dynamics interface
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Results from WG for Dynamics and Coupling
Dynamics/Physics interfaces• treatment of physical tendencies in PC scheme• mass conservation • the mass of water removed from the atmosphere
is replaced by the dry air• ALADIN: physics tendencies at origin point
Investigation:• 1/2 at origin and 1/2 at arrival points• stratiform prec. at arrival, rest at departure point
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Results from WG for Dynamics and Coupling
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Working Group for Physics
. Shallow convection / PBL cloudiness Convergence Xu-Randall and Seidl-Kann scheme
Experiments on inversion formation and sustenance
. CAPE & deep convection triggering
. Orographic drag/envelope Validation on precipitation and wind (x=10 km - 2.5 km)
V. Numeric of parameterization schemas
V. Prognostic cloud water
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Results from WG for Physics
The role of surface evaporation in the triggering of mountain convection in ALADIN
=> Mountains with their differential evaporation and solar heating regimes create mesoscale baroclinic circulations and may establish an environment locally favourable for deep convection
• Weather situation: a series of days with deep convection triggered locally by orographic effects in the absence of large-scale forcing
• Drau valley in Carinthia, Austria‘s southernmost province• 24-hour model run with evaporation set equal to zero
(dx=4km)
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Results from WG for Physics
Conclusions:
• Near-surface humidity convergence over the mountain chains reduces by around 30% to the north („dry“) side of the boundary, but by only 10 – 20% to the south („humid“) side
• Convective precipitation decreases significantly; remaining convection concentrates on the mountains along and to the south („humid“) side of the air mass boundary, where it can still obtain enough moisture
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red numbers: firstprecipitation at .. UTC
REF EXP
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2m specific humidity (09 UTC):
REF EXP
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2m humidity divergence (12 UTC):
Green numbers: relative decreaseof humidity convergence [%]
compared to REF
REF EXP
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Working Group for Data Assimilation
. Methods - Algorithmic aspectsIsotropy properties of the B matrix
Multivariate humidity formulation in the B matrix
Lonnberg -Hollingsworth versus NMC variances
. Methods - Cycling
. ObservationsATOVS and MSG
AMDAR
10 wind
Wind profilers data
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Working Group for Data Assimilation (cont.)
. Observations (cont.)Radar data
V. Surface Snow analysis experiments
V. Latent Heat Nudging
VI. LAMEPSOptimization of ARPEGE singular vector computations for CE
ALADIN EPS using PEACE perturbations
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Results from WG for Data Assimilation
Assimilation of ATOVS data• improvements of treatment of AMSU-A, AMSU-B
• Choice for radiance-bias correction for LAM
bias corr. coefficients: scan-angle biases and
coefficients for air-mass predictors
LAM- satellite paths are cut problems for scan-angle biases
Harris and Kelly reduction of bias
actions: to enlarge domain for 3DVar
to re-compute bias corr. Coefficients for LAM
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Results from WG for Data Assimilation
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Results from WG for Data Assimilation
Snow analysis with CANARIsignificant T2 overestimation in strong winter inversion
diagnostics:
RH2 is too dry, short wave radiation is too big
too strong 10m wind and wind gust
NO SNOW analysis
cure: 3DVAR +CANARI snow analysis + modified physics
)Sn)(SnT(2763
1)T(276
2
1Sn climmodobsclim
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Results from WG for Data Assimilation
3D-VARToo warm
10-12. deg. err.4-6 deg. err.
4-6. deg. err.
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Results from WG for Data Assimilation
• LACE Data Assimilation mini Workshop
(Budapest, 20-22 October, 2003)
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Future Actions
WS on dynamics-physics interfacing
November 2004, Prague
training in NH ALADIN Early winter 2005, Prague
WS on maintenance
Autumn 2005, Budapest