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Austria Croatia

Czech Republic

Hungary Slovenia Slovakia

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New Motivations and Goals

Network of NWP partners in Central Europe

Common R&D on meso-scale NWP Individual operational applications,

dedicated to end-users

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RC LACE new structure2nd RC LACE MoU (2003-2005)

CouncilLACE Steering Committee

Management Group

» Project Leader» ALADIN System Co-ordinator» Data Manager

Working Group Leader for» Data Assimilation» Dynamics and Coupling» Physics

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Common objectives

Maintenance of ALADIN code

ARPEGE LBC for LACE domain(00 and 12 UTC, 3h freq.)

Telecommunications Satellite dissemination

RETIM2000 - DVB equivalent for 128 kBps link

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Decentralized responsibilities

Operational Applications (AU,CR,CZ,HU,SI)

Archiving Local and decentralized R&D

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Scientific Plan for year 2003General goals

• to keep the level of R&D from previous period (40% of ALADIN human power)

• to continue the work on opened subjects• to add more networking• to organize R&D stays of the scientists • to organize training, workshops

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Scientific Plan for year 2003Local research and missions

• Each service organized environment for local research and R&D visits • Visits are financed by LACE 15 person/months R&D missions : 4 person/months R&D stays par each WG 3 person/months equivalent for workshops and meetings

Total R&D: ~90 person/months for 2003

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Scientific Plan for year 2003Working group plans

Working Group Plans Projects

SubjectsWorkshops and training

Link with ALADIN and ALATNET subjects

1st LACE Steering Committee Meeting

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Working Group for Dynamics and Coupling

• Non-hydrostatic dynamics• Interative schemes • Choice of additional NH variables• Bottom boundary condition

• Dynamics – other topics• Horizontal diffusion• Radiative UBC• Physics/dynamics interface

• Coupling• Spectral coupling• Surface pressure tendency coupling• Two-time nesting• Coupling files initialization

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Results from WG for Dynamics and Coupling

• Mini-coupling workshop (Ljubljana, 17-21 February 2003) part of ALATNET activities

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Results from WG for Dynamics and Coupling

NH Dynamics

Reformulation on Bottom Boundary Conditionfor term non hydrostatic pressure departure to cure the problem of “chimney effect” in SL schemeBefore: believe that chimney problem is specific to SL advectionResults find:• turning ON horizontal diffusion can create chimney effect

in vertical velocity even in Eulerian advection• stronger diffusion caused stronger chimney to continue with 2D academic tests

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Working Group for Physics

. Shallow convection / PBL cloudiness • Prognostic cloud water• Subgrid -scale cloudiness• Non-local vertical transport• Radiation

. CAPE & deep convection triggering. Orographic dragV. Physics/dynamics interface (AROME)

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Results from WG for Physics

• Deep convection triggering- overestimation of convective precipitation and cloudiness over Alps (to wide domains, to long prec. events)1-Threshold for second KUO-type triggering2-Cumulated moisture convergence -as condition for triggering3-Time delay equation for moisture convergence

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Results from WG for Physics

Orographic drag study- for ALADIN and ARPEGE- reduction of envelope presentation of orography- optimization of sub-grid drag parameterization

Results: some form of semienveloped orography

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Working Group for Data Assimilation

I .Methods - Algorithmic aspects• Biperiodic 3d-VAR analysis increments• Moving to 3d-FGAT• Study of vertical structure of 3d-VAR analysis increments• Design of an explicit blending

. Methods - Cycling• Comparison of "DFI" and "explicit" blending• Blendvar cycling experiments• 3d-VAR cycling experiments to elaborate cold air-pad cases

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Working Group for Data Assimilation (cont.)

. Observations• Implementation of ODB – training• Assimilation of ATOVS data; Radar data; AMDAR data

V. Surface • Implementation of CANARI/Diag-pack• Smoothing of Soil Wetness Index• Assimilation of 10m wind data

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Results from WG for Data Assimilation

• LACE ODB training (Budapest, 14-18 April, 2003) Observation Data Base from AL25t2 cycle - implementation of ODB - technical exercises - compilation, tutorials

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Results from WG for Data Assimilation

• Study of vertical structure of 3d-VAR analysis increments - NMC and “lagged” statistics for Background error covariance

matrix B - vertical structure of NMC and “lagged” statistics - AIREP, Temp

Study of vertical structure of 3d-VAR analysis increments

- lagged statistics is responsible for reduction of analysis increments and more mesocsale structure of correlation functions

- reduction is smaller on lower levels, because small scale processes are more intensive in lower atmosphere

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Results from WG for Data Assimilation

Smoothing of Soil Wetness Index (SWI) over LACE Domain- problem: stationary hot spots in 2m Temperature field - same problem in ARPEGE and

ALADIN/France caused by to warm soil

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Future Actions

• LACE Data Assimilation Training and Workshop(Budapest, 20-22 October, 2003)

• 13th ALADIN Workshop(Prague, 24-28 November,2003)

• 2nd RC LACE Steering Committee Meeting(Prague/Ljubljana, mid December, 2003)

Final report of R&D 2003; SP for 2004