RC LACE Status Report

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RC LACE 2004
Regional Co-operation of A, CR, CZ, H,
SI, SK
Dijana Klaric
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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 Internet
• Satellite 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 Slovenia
• started 2002
• aims
• to unify the verification on synoptic scale
• to impose the international standards
• to reduce duplication of work
• to compare different ALADIN at the same domain
• environment toward meso-scale verification

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Verification project

• Prototype
• station list
• 348 74
• ECMWF
• TM 430

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DB of Case Studies
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(No Transcript)
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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 RD 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 dynamics
• Interative schemes
• Choice of additional NH variables
• Bottom boundary condition
• Finalization of NH Dynamics
• Diabatism in NH
• ??. Dynamics other topics
• Horizontal 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 (?x10
  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
• gt 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, Austrias southernmost
  province
• 24-hour model run with evaporation set equal to
  zero (dx4km)

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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 first precipitation 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 decrease of humidity
convergence compared to REF
REF
EXP
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Working Group for Data Assimilation

• ?. Methods - Algorithmic aspects
• Isotropy properties of the B matrix
• Multivariate humidity formulation in the B
  matrix
• Lonnberg -Hollingsworth versus NMC variances
• ??. Methods - Cycling
• ???. Observations
• ATOVS 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. LAMEPS
• Optimization 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 CANARI
• significant 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

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Results from WG for Data Assimilation
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

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Austria Croatia Czech
Republic Hungary
Slovenia Slovakia