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Communication incl. Poster: BibTeX citation key:  AgustiPanaredaa
Agusti-Panareda, A., Beljaars, A., Bouffiès-Cloché, S., Genkova, L., Cardinali, C., Dragosavac, M., Ahlgrimm, M., Köhler, M., Forbes, R., Bock, O. & Nuret, M. 2009. The special ECMWF reanalysis for the AMMA field experiment during the 2006 wet monsoon season. Work presented at Third International AMMA Conference, July 20—June 24, at Ouagadougou, Burkina Faso.
Added by: Devic 2009-09-09 09:30:40    Last Edited by: roussot 2010-11-16 18:18:53
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Categories: Atmospheric processes, Land surface-atmosphere feedback, Monsoon system and its variability, Water cycle, Weather to Climatic modelling and forecasting
Creators: Agusti-Panareda, Ahlgrimm, Beljaars, Bock, Bouffiès-Cloché, Cardinali, Dragosavac, Forbes, Genkova, Köhler, Nuret
Publisher: African Monsoon Multidisciplinary Analyses (Ouagadougou, Burkina Faso)
Collection: Third International AMMA Conference

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Abstract
During the 2006 AMMA field experiment an unprecedented number of soundings were performed in West Africa. However, due to technical problems many of these soundings did not reach the Global Telecommunication System and therefore they could not be included in the operational NWP analyses. This issue, together with the realization that there was a significant bias in the radiosonde humidity lead to the conclusion that a reanalysis effort was necessary. This reanalysis was performed at ECMWF spanning the wet monsoon season of 2006 from May to September. The key features of the ECMWF AMMA reanalysis will be presented, including the use of: (1) a newer model version with improved physics, (2) all the AMMA radiosonde data available from the AMMA database, (3) a new radiosonde humidity bias correction scheme.
The main differences between the AMMA reanalysis and the operational analysis will be highlighted. These include the presence of a stronger African Easterly Jet (AEJ) and the precipitation increase in the region of the Inter-tropical convergence zone (ITCZ). In order to show the impact of the extra AMMA radiosonde observations on the NWP analysis and forecast, the AMMA reanalysis will be compared with an experiment containing only the observations from stations that were operating reliably in 2005, i.e. before the AMMA field experiment. Results show that the AMMA radiosonde observations had an impact on the analysis of the AEJ and the precipitation distribution of the short range forecast.
Last Edited by: roussot