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Communication incl. Poster: BibTeX citation key:  Lawina
Lawin, A. E., Afouda, A. & Lebel, T. 2009. Rainfall trend analysis in five climatic regions in Benin. Work presented at Third International AMMA Conference, July 20—24, at Ouagadougou, Burkina Faso.
Added by: Devic 2009-10-09 09:21:18    Last Edited by: roussot 2009-10-16 16:34:00
Categories: Monsoon system and its variability
Keywords: Precipitation
Creators: Afouda, Lawin, Lebel
Publisher: African Monsoon Multidisciplinary Analyses (Ouagadougou, Burkina Faso)
Collection: Third International AMMA Conference

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The West – African region is submitted to singular climate fluctuations since the beginning of the 70s. Climate changes became therefore a major preoccupation for scientists and decision makers since many decades because of their consequences on society and environment. The capacity of people to control climate variability is more affected in the present context of high anthropic pressure on environment and surface conditions modification. Although most scientists agree on the break of stationarity of rainfall around the end of the 60s and beginning of the 70s, climate trend remains a subject of debate. In our region, it is well known that precipitations are the significant parameter to consider in climate characterization and water resources vulnerability evaluation.
Therefore, this study aims to verify if the downward trend observed on most rain gauges in Benin, during the period 1970 – 1990, is still currently significant. We use three representative rain gauges in each of the five climatic regions defined by Le Barbé et al., (1993) to analyze first, the rainfall trend in each region by parametric and non parametric statistical test and secondly, the distribution of dry and wet sequences in each region. The data used are annual rain series during the period 1940 – 2007. We compare the recent period 1990 – 2007 with the period before 1970 and the period 1970 - 1990.
Last Edited by: roussot