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Impact of the MAP reanalysis on the numerical simulation of the MAP-IOP2a convective system

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Numerical simulations of the convective system observed during the MAP IOP2a have been performed with the Meso-NH mesoscale model, using a threefold nesting technique with horizontal mesh-sizes of 32, 8 and 2 km. The reference experiment initialized from the operational ECMWF analysis of 17 September 1999 12 UTC succeeds reasonably well in initiating the convective line over the Alpine foothills and reproducing its propagation towards the East. The sensitivity of these results to the reanalysis products is investigated. In the ECMWF MAP reanalysis, the lower atmosphere above Northern Italy is found considerably drier than in the operational analysis. As a consequence, convection is almost entirely inhibited in the mesoscale simulations based upon the reanalysis. Different sensitivity experiments further highlight the strong dependence of the mesoscale results upon the initial moisture fields.

Für das konvektive System, das während MAP IOP2a auftrat, wurden numerische Simulationen durchgeführt mit Hilfe des Mesoskalen-Models Meso-NH in Dreifachnestung mit horizontalen Gitterweiten von 32, 8 und 2 km. Ein Kontrollexperiment, das mit der operationellen ECMWF Analyse am 17. September 1999, 12 UTC, initialisiert wurde, reproduziert die linienartige Konvektion am Alpenrand samt ihrer ostwärts Verlagerung zufriedenstellend. Die Abhängigkeit dieser Befunde von den Ergebnissen der MAP Re-Analyse am ECMWF wird untersucht. Es zeigt sich, dass die untere Atmosphäre über Norditalien deutlich trockener ist als in der operationellen Anaylse. Folglich wird in Simulationen, die auf der Re-Analyse fußen, Konvektion fast völlig unterdrückt. Weitere Sensitivitätsexperimente unterstreichen die starke Abhängigkeit der mesoskaligen Ergebnisse von den Feuchtefeldern zum Anfangszeitpunkt.


Document Type: Research Article


Publication date: 2004-02-01

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  • Meteorologische Zeitschrift (originally founded in 1866) is the joint periodical of the meteorological societies of Austria, Germany and Switzerland. It accepts high-quality peer-reviewed manuscripts on all aspects of observational, theoretical and computational research out of the entire field of meteorology, including climatology. Meteorologische Zeitschrift represents a natural forum for the meteorological community of Central Europe and worldwide.
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