Physics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002angeo..20..575p&link_type=abstract
Annales Geophysicae, vol. 20, Issue 4, pp.575-582
Physics
18
Scientific paper
The correlation of 0.61 found between observed July September Sahelian rainfall in year 0 and September November Guinean rainfall in year - 1, led us to explore the statistical relationships between precipitation, soil moisture and near surface Moist Static Energy (MSE) gradients in West Africa. These analyses were performed over successive 30-year periods and specifically, the most recent period between 1968 1998. It is shown from observations, National Centers for Environmental Predictions and National Center for Atmospheric Research (NCEP/NCAR) reanalyses and from the Global Soil Wetness Project (GSWP) database, that wet Sahelian rainy seasons are preceded by abnormally wet soils over the Sudan-Guinean belt during northern winter. Such moisture anomalies tend to hold during the dry season, then generate increasing MSE gradients just above the continent by March April. These gradients have been shown to be of prime importance for monsoon dynamics and associated rainfall.
Fontaine Bruce
Philippon Nathalie
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