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

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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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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

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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