The COSMO-LEPS mesoscale ensemble system: validation of the methodology and verification
The limited-area ensemble prediction system COSMO-LEPS has been running every day at ECMWF since November 2002. A number of runs of the non-hydrostatic limited-area model Lokal Modell (LM) are available every day, nested on members of the ECMWF global ensemble. The limited-area ensemble forecasts ra...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2005-01-01
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| Series: | Nonlinear Processes in Geophysics |
| Online Access: | http://www.nonlin-processes-geophys.net/12/527/2005/npg-12-527-2005.pdf |
| _version_ | 1819112904796930048 |
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| author | C. Marsigli F. Boccanera A. Montani T. Paccagnella |
| author_facet | C. Marsigli F. Boccanera A. Montani T. Paccagnella |
| author_sort | C. Marsigli |
| collection | DOAJ |
| description | The limited-area ensemble prediction system COSMO-LEPS has been running every day at ECMWF since November 2002. A number of runs of the non-hydrostatic limited-area model Lokal Modell (LM) are available every day, nested on members of the ECMWF global ensemble. The limited-area ensemble forecasts range up to 120h and LM-based probabilistic products are disseminated to several national and regional weather services. Some changes of the operational suite have recently been made, on the basis of the results of a statistical analysis of the methodology. The analysis is presented in this paper, showing the benefit of increasing the number of ensemble members. The system has been designed to have a probabilistic support at the mesoscale, focusing the attention on extreme precipitation events. In this paper, the performance of COSMO-LEPS in forecasting precipitation is presented. An objective verification in terms of probabilistic indices is made, using a dense network of observations covering a part of the COSMO domain. The system is compared with ECMWF EPS, showing an improvement of the limited-area high-resolution system with respect to the global ensemble system in the forecast of high precipitation values. The impact of the use of different schemes for the parametrisation of the convection in the limited-area model is also assessed, showing that this have a minor impact with respect to run the model with different initial and boundary condition. |
| first_indexed | 2024-12-22T04:20:55Z |
| format | Article |
| id | doaj.art-dda8d77503dd4ff6b48a8d905f86afdb |
| institution | Directory Open Access Journal |
| issn | 1023-5809 1607-7946 |
| language | English |
| last_indexed | 2024-12-22T04:20:55Z |
| publishDate | 2005-01-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Nonlinear Processes in Geophysics |
| spelling | doaj.art-dda8d77503dd4ff6b48a8d905f86afdb2022-12-21T18:39:18ZengCopernicus PublicationsNonlinear Processes in Geophysics1023-58091607-79462005-01-01124527536The COSMO-LEPS mesoscale ensemble system: validation of the methodology and verificationC. MarsigliF. BoccaneraA. MontaniT. PaccagnellaThe limited-area ensemble prediction system COSMO-LEPS has been running every day at ECMWF since November 2002. A number of runs of the non-hydrostatic limited-area model Lokal Modell (LM) are available every day, nested on members of the ECMWF global ensemble. The limited-area ensemble forecasts range up to 120h and LM-based probabilistic products are disseminated to several national and regional weather services. Some changes of the operational suite have recently been made, on the basis of the results of a statistical analysis of the methodology. The analysis is presented in this paper, showing the benefit of increasing the number of ensemble members. The system has been designed to have a probabilistic support at the mesoscale, focusing the attention on extreme precipitation events. In this paper, the performance of COSMO-LEPS in forecasting precipitation is presented. An objective verification in terms of probabilistic indices is made, using a dense network of observations covering a part of the COSMO domain. The system is compared with ECMWF EPS, showing an improvement of the limited-area high-resolution system with respect to the global ensemble system in the forecast of high precipitation values. The impact of the use of different schemes for the parametrisation of the convection in the limited-area model is also assessed, showing that this have a minor impact with respect to run the model with different initial and boundary condition.http://www.nonlin-processes-geophys.net/12/527/2005/npg-12-527-2005.pdf |
| spellingShingle | C. Marsigli F. Boccanera A. Montani T. Paccagnella The COSMO-LEPS mesoscale ensemble system: validation of the methodology and verification Nonlinear Processes in Geophysics |
| title | The COSMO-LEPS mesoscale ensemble system: validation of the methodology and verification |
| title_full | The COSMO-LEPS mesoscale ensemble system: validation of the methodology and verification |
| title_fullStr | The COSMO-LEPS mesoscale ensemble system: validation of the methodology and verification |
| title_full_unstemmed | The COSMO-LEPS mesoscale ensemble system: validation of the methodology and verification |
| title_short | The COSMO-LEPS mesoscale ensemble system: validation of the methodology and verification |
| title_sort | cosmo leps mesoscale ensemble system validation of the methodology and verification |
| url | http://www.nonlin-processes-geophys.net/12/527/2005/npg-12-527-2005.pdf |
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