ALADIN & LACE recent and ongoing Development on LAMEPS

Yong Wang

ZAMG, Austria

With contribution from Bellus, Hagel, Horanyi, Ivatek-Sahdan, Kann, Kertesz, Mladek, Radu, Tascu, Wittmann, Wimmer etc.

• Overview of LAMEPS research activities in ALADIN countries

• LAMEPS operations in ALADIN

• LAMEPS R & D in ALADIN

• International collaboration

• Summary and future plan

Overview of LAMEPS research in ALADIN/LACE

• Austria: ETKF/ET, Breeding, Blending, downscaling, post-processing, LBC and physics perturbation

• Blegium: downscaling

• Croatia: downscaling

• Czech: downscaling, ALADIN SV

• Hungary: downscaling, ALADIN SV

• Portugal: downscaling

• Romania: multi-model EPS, downscaling, LBC and physics uncertainties

LAMEPS operations in ALADIN/LACE

ALADIN-LAEF (Limited Area EnsembleForecasting)

Since Mar. 2007 in pre-operation

ALADIN CY31

Hydrostatic, spectral, η in vertical

18km horizontal, 37 levels

SLSI, DFI, 600s time step

Bougeault deep convection,

Lopez microphysics, ISBA,

RRTM radiation scheme....

Forecast integration up to 54h

ALADIN-LAEF

LAEF ensemble size: 22 members

16 x perturbed members:

ECMWF singular vector perturbation

1 x downscaling of ECMWF-EPS control

1 x downscaling of ECMWF deterministic

4 x ALADIN-AUSTRIA runs (00, 06,12,18)

22 Members

2 runs per day (00 und 12 UTC)

Products available: ca. 2.5h after ECMWF-EPS

Operational procedure: ECMWF EPS Data from MARS 901 927 001 ftp to ZAMG FA to GRIB1 conversion products and visualization ftp to LACE webpage

ALADIN-LAEF

Every 3 hours interval, from 6 to 54 hours forecast

0.15 degree Lat/Lon grid

• Mean/spread/probability/post stamp:

T2m, 10m Wind, Precipitation, Mslp,

• EPS meteogram T2m, 10m Wind, Precipitation, Cloudiness 2m RH, wind gust, CAPE, convective cloudniss

• Mean/spread/spaghetti/probability/post stamp chart: 250, 500, 700, 850, 925hPa, T, Wind, Geopotential, RH

(lower level), 1000-850hPa, 1000-500hPa, 850-700hPa thickness

• Mean/spread/spaghetti/probability: CAPE, Lifted Index, cloud water?

LACE domain for products

ALADIN-LAEF

LAMEPS R&D in ALADIN

- ALADIN native SV

- Blending SV and Breeding, ETKF/ET

- LBC and physics perturbation

- Downscaling

- Verification

ALADIN SV (by Hagel, Horanyi and Mlaedk)

1. ALADIN SV computation has been implemented at ECMWF and Meteo-France.

2. Technical issues (CPU and memory) have been analysed.

3. Sensitivity tests with respect to horizontal resolution (22km and 44km for GLAMEPS domain) and to optimization time (12h and 24h) have been carried out, in which the optimization area is the LACE one.

4. There are also efforts on study of technical feasibility of semi-Lagrangian SV computation.

ALADIN native SV

44km, optimisation: 12h and LACE domain

ALADIN native SV

44km, optimisation: 24h and LACE domain

Blending SV and Breeding

ALADIN-LAEF: Blending global SV with ALADIN LAEF Breeding

To combine the large-scale uncertainty from global SV-EPS with the small-scale uncertainty generated by Breeding/ET in LAEF. It is expected that 1). reducing the inconsistency between global and limited area EPS. 2). combining the future uncertainty generated by SV and the uncertainty in the past generated by Breeding. Method: spectral analysis and digital filter.

Blending

Breeding, ETKF and ET

1. Similar results with Breeding ETKF and ET have been shown in the 10 members LAEF experiments.

2. New experiment with 18 members EPS, and longer test period (more than 2 sommer months) is going on.

3. Combination of Breeding, ETKF and ET with the multi-physics schemes of ALADIN has been designed.

4. The research results (if there is an improvement!) will be introduced into ALADIN LAEF.

LBC and physics uncertainties

1. The research on LAEF Breeding/ET coupling with ARPEGE SV and NCEP EPS Breeding/ET, and on the use of multi-physics scheme have shown encouraging results. Those will be introduced into the operational ALADIN-LAEF

2. Surface perturbation in LAEF is in consideration.

3. Work with different coupling techniques for dealing with the uncertainty on LBC is going on (Radu).

4. The research results (if there is an improvement!) will be introduced into ALADIN LAEF.

Downscaling

• Downscaling of ARPEGE EPS (by Mladek)

1. Downscaling of PEARP for the cases with which there are big problem in precipitation forecast. Finding the more added value of ALADIN downscaling of PERAP for those difficult situation

2. Results show that there is no real more added value with ALADIN downscaling of PEARP

3. The best result is the combination of PEARP and ALADIN downscaling.

• Downscaling of ECMWF EPS

Publication on ECMWF Tech. Note by Ivatek-Sahdan, Brankovic and Matjacic. Efforts have been done also in HU, PO and BE.

Downscaling

Verification (by Mladek, Kann and Hagel)

• A common verification package has been developed.

Namelist controlled

Common Verification Package

• Aim: Simple, stand-alone, easy use and portable, universal

LAEF Verification: upper air

LAEF Verification: precipitation

LAEF Verification: T2m

International Collaboration

MAP D-Phase

GLAMEPS

B08RDP

THORPEX/TIGGE-LAM

WMO/WWRP FDP: MAP D-PHASE

Provided by Felix Ament, MeteoSwiss

MAP D-PHASE

Provided by Felix Ament, MeteoSwiss

WMO/WWRP: B08RDP

B08RDP: Beijing 2008 Olympics Mesoscale Ensemble Prediction Research and Demonstration Project

Partners: NCAR, NCEP, MSC, JMA, CMA, ZAMG/Meteo-France acting as a single partner.

WMO/WWRP: B08RDP

B08RDP is a five years research project 2005-2009,each participant will provide their LAMEPS products in real time to Beijing Olympics 08 for demonstration.

LAMEPS tier 1: 15km, 30 levels, 10 members, 6-36h forecast, domain 3500x3000km LAMEPS tier 2: 2-4km, 30-60 levels, 1-2 members, 0-36h forecast, domian 1320x1100km

ALADIN-LAEF is used for regional EPS action with resolution 15km, 37 levels: August 2007 for Test and in August 2008 for Olympic game

AROME will be used for meso-scale EPS with very high resolution 2-4km.

WMO/WWRP: B08RDP

WMO/WWRP: B08RDP

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Verification

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Bias correction and combination: T2m

RMS error (2007.8.14-2007.8.24)

left – before BC right –after BC

•RMS errors of all EPS after calibration have been decreased obviously.•Diurnal changes have been lowered after calibration.•Combined-Ensemble RMS error after calibration is the smallest of all, before calibration, it is the smallest in most cases. •After calibration spread is more closer to RMS errors than before.

The LAMEPS application in ALADIN LAEF has been put into pre-operation since Mar. 2007.

Optimation of LAEF is needed, in particular, some near surface parameters due to the coupling between ALADIN and ECMWF model

Many LAMEPS R&D activities in ALADIN, like ALADIN-SV, Blending, ETKF/ET, multi-physics, downscaling, multi-model EPS, verification, etc.

ALADIN LAMEPS colleagues are also active on different international collaborations.

Summary

Future plan

• Improvment and optimization of ALADIN LAEF

• Continuing the research on SV, Blending, ETKF/ET, downscaling, clustering, Post-processing, surface perturbation, verification, etc.

• Demonstration and exchange the research result with international LAMEPS community (GLAMEPS, B08RDP, MAP D-PHASE, TIGGE-LAM).

Acknowledgment

Thanks very much to all the ALADIN Colleagues, who has contributed the ALADIN LAMEPS work, in particular,Bazile, Bellus, Bouttier, Fischer, Hagel, Horanyi, Ivatek-Sahdan, Kann, Kertesz, Mladek, Nicolau, Radu, Tascu, Wittmann, Wimmer, etc.

Thanks also the COSMO colleagues for help with EPS clustering, e.g. Paccagnella, Montani, Marsigli and so on.

Thanks also the colleagues in CMA, NCEP, NRL, MSC, who has helped the EPS work at ZAMG.