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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

Subjects

Workshops 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 scheme

Before: believe that chimney problem is specific to SL advection

Results 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 drag

V. 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 triggering

2-Cumulated moisture convergence -as condition for triggering

3-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