Search results for "diagnostic climatique"

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L'Oscillation de Madden-Julian et la variabilité pluviométrique régionale en Afrique Subsaharienne

2007

The role of the Madden-Julian Oscillation ("MJO") on rainfall variability in Sub-Saharan Africa is examined, based on daily rain-gauge records and the NCEP-DOE AMIP-II reanalyses. The convective and dynamical signal associated with the MJO is extracted using two differing methodologies, the BMRC daily indices (Wheeler & Hendon 2004) on the one hand, and a Local Mode Analysis ("LMA", Goulet & Duvel 2000) on the other hand. The temporal variability of the MJO (in terms of period, amplitude, seasonality and location of the convective anomalies) is first analysed. Though the overall amplitude of the signal is not related to El Niño, the oscillations occurring under El Niño (La Niña) conditions …

atmospheric <br />dynamicsintraseasonal variabilityinteractions d'échelleSub-Saharan Africavariabilité intrasaisonnièrerainfall<br />dynamique atmosphériqueclimate diagnosticAfrique Subsaharienne[SDU.STU.CL] Sciences of the Universe [physics]/Earth Sciences/Climatology[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatologydiagnostic climatiqueMadden-Julian Oscillationpluviométriescale interactions[ SDU.STU.CL ] Sciences of the Universe [physics]/Earth Sciences/ClimatologyOscillation de Madden-Julian

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