dijana klarić

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