See updated informations on this web server at : http://www.cnrm.meteo.fr/aladin/oper/oper.html .
more details jure.jerrman++at++rzs-hm.si
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Last news in Newsletter16.
Last news in Newsletter16..
Last news in Newsletter16.
Last news in Newsletter16.
See article "A review of the main changes in ALADIN along 1999 and their impact on forecasts" in this Newsletter.
The intermediate cycle AL11T2 and a new version of the GRIBEX package were installed and validated on the SUN workstation.
- The main event during the last quarter of 1999 was the installation and the operational implementation of the AL11t1 version of the ALADIN code. The operational switch took place at the beginning of November. At the same time the operational application of the CANARI diag.pack scheme was also upgraded using the last tuned version of it with 1 hour execution frequency. Recently the setting of the diag.pack scheme is as follows (starting at 12 minutes after every hour):
- Preparation of special ASCII files for Mandalay from the SYNOP observations;
- Execution of Mandalay, which creates the binary input file for the CANARI scheme;
- Execution of the CANARI diag.pack scheme;
- FULL-POS for post-processing;
- Creation of netcdf files, needed for the nowcasting applications based on the CANARI scheme.
As it can be seen basically the diag.pack scheme is used for nowcasting purposes having the analyses near to the observations. The outputs of diag.pack are especially used for the early recognition of convective phenomena with the tracing of such derived quantities as convective available potential energy or moisture convergence. The first experiences of the upgraded scheme are very positive, also some case studies were carried out showing the potential of the scheme.
At the very end of the year an upgrade of the SGI Origin2000 machine was performed, now there are 12 processors available in the machine making the exploitation of the ALADIN/HU model even quicker (the execution time is around 1 hour for 48 hours forecasts).
1. Evolution of the ALADIN/LACE application.
The ALADIN/LACE application followed the evolution of ARPEGE application and switched to the CYCORA set of modifications on:
30/11/1999 for 12 UTC network time (CYCORA fix on the cycle AL11/CY21T1.op1/XR19)
CYCORA modifications were before tested in parallel suites, the first one using ARPEGE/CYCORA double suite for providing the lateral boundary conditions (LBC), the second one using ARPEGE operational LBC. A positive impact was observed when ALADIN/CYCORA was coupled with ARPEGE/CYCORA (we saw there a beneficial impact when the coupling model got improved). The switching on CYCORA in ALADIN/LACE had a neutral impact on the scores. Since the test was done in winter season and the domain of LACE is rather continental (little chance for Atlantic storm cyclogenesis), we may see the impact of CYCORA still in summer season, like a work on some isolated case studies (Flood'97 case, July'98 storm case) already suggests.
2. Parallel Suites
- The Prague Team launched the following parallel tests to assess the impact of different modifications:
- Pre-operational test of CYCORA (names aan, aao, aap, aaq), as explained above.
- EUCOS (name aap) suite, testing the impact of coarser radio-sounding observations on ALADIN/LACE via the coupling with ARPEGE/EUCOS double suite. The impact of reduction of observations on the scores is clearly negative in the most of characteristics.
- HUCOE/HUTIL suite, modifying the parameterization of clouds. The impact has not been evaluated yet.
- 41 Levels suite, testing the impact of higher vertical resolution (anticipation of ARPEGE 41L configuration). The suite has started just before Christmas and it still continues.
The scores may be consulted on www.chmi.cz/meteo/ov/lace/aladin/partests pages.
Last news in Newsletter16.
Last news in Newsletter16.
(more details mario.almeida++at++meteo.pt )
Last news in Newsletter16.
Last news in Newsletter16.
Last news in Newsletter16.
Last news in Newsletter16 .
