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RC LACE 2004. Regional Co-operation of A, CR, CZ, H, SI, SK. Dijana Klarić. RC LACE efforts 2nd RC LACE MoU (2003-2005 ). Operations & maintenance Networking Research & development. Operations & maintenance. all 6 members - individual operational applications SK***** - PowerPoint PPT Presentation
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RC LACE 26th EWGLAM Meeting 4-6 October 2004, Oslo 1
RC LACE 26th EWGLAM Meeting 4-6 October 2004, Oslo 2
RC LACE efforts2nd RC LACE MoU (2003-2005)
Operations & maintenance
Networking
Research & development
RC LACE 26th EWGLAM Meeting 4-6 October 2004, Oslo 3
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
RC LACE 26th EWGLAM Meeting 4-6 October 2004, Oslo 4
Telecommunications
RETIM2000 vs InternetSatellite dissemination
DVB
bandwidth eq. to 128 kBps link
RETIM 40% budget
as backup to Internet
RC LACE 26th EWGLAM Meeting 4-6 October 2004, Oslo 5
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
RC LACE 26th EWGLAM Meeting 4-6 October 2004, Oslo 6
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
RC LACE 26th EWGLAM Meeting 4-6 October 2004, Oslo 7
Verification project
• Prototype
• station list 348 +74
ECMWFTM 430
RC LACE 26th EWGLAM Meeting 4-6 October 2004, Oslo 8
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
RC LACE 26th EWGLAM Meeting 4-6 October 2004, Oslo 9
RC LACE 26th EWGLAM Meeting 4-6 October 2004, Oslo 10
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
RC LACE 26th EWGLAM Meeting 4-6 October 2004, Oslo 11
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 ?
RC LACE 26th EWGLAM Meeting 4-6 October 2004, Oslo 12
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
RC LACE 26th EWGLAM Meeting 4-6 October 2004, Oslo 13
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
RC LACE 26th EWGLAM Meeting 4-6 October 2004, Oslo 14
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
RC LACE 26th EWGLAM Meeting 4-6 October 2004, Oslo 15
Results from WG for Dynamics and Coupling
RC LACE 26th EWGLAM Meeting 4-6 October 2004, Oslo 16
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
RC LACE 26th EWGLAM Meeting 4-6 October 2004, Oslo 17
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)
RC LACE 26th EWGLAM Meeting 4-6 October 2004, Oslo 18
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
RC LACE 26th EWGLAM Meeting 4-6 October 2004, Oslo 19
red numbers: firstprecipitation at .. UTC
REF EXP
RC LACE 26th EWGLAM Meeting 4-6 October 2004, Oslo 20
2m specific humidity (09 UTC):
REF EXP
RC LACE 26th EWGLAM Meeting 4-6 October 2004, Oslo 21
2m humidity divergence (12 UTC):
Green numbers: relative decreaseof humidity convergence [%]
compared to REF
REF EXP
RC LACE 26th EWGLAM Meeting 4-6 October 2004, Oslo 22
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
RC LACE 26th EWGLAM Meeting 4-6 October 2004, Oslo 23
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
RC LACE 26th EWGLAM Meeting 4-6 October 2004, Oslo 24
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
RC LACE 26th EWGLAM Meeting 4-6 October 2004, Oslo 25
Results from WG for Data Assimilation
RC LACE 26th EWGLAM Meeting 4-6 October 2004, Oslo 26
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
RC LACE 26th EWGLAM Meeting 4-6 October 2004, Oslo 27
Results from WG for Data Assimilation
3D-VARToo warm
10-12. deg. err.4-6 deg. err.
4-6. deg. err.
RC LACE 26th EWGLAM Meeting 4-6 October 2004, Oslo 28
Results from WG for Data Assimilation
• LACE Data Assimilation mini Workshop
(Budapest, 20-22 October, 2003)
RC LACE 26th EWGLAM Meeting 4-6 October 2004, Oslo 29
Future Actions
WS on dynamics-physics interfacing
November 2004, Prague
training in NH ALADIN Early winter 2005, Prague
WS on maintenance
Autumn 2005, Budapest