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Catchment classification: multivariate statistical analyses for physiographic similarity in the Upper Niger Basin

Chaibou Begou, J.;  Bazie, P.; Afouda, A.

JamilatouChaibouBegouInt. Journal of Engineering Research and Applications. www.ijera.com ISSN: 2248-9622, Vol. 5, Issue 9, (Part-1) September 2015, pp.60-68
The objective of this study was to determine physiographic similarity, as indicator of hydrologic similarity between catchments located in the Upper Niger Basin, and to derive the dominant factors controlling each group singularity. Results showed a clear distribution into 2 major clusters: a group of easterly flat catchments and another of westerly hilly catchments. This nomenclature came from the interpretation of the main factors, topography and longitude, that seem to control the most important variability between both clusters. In addition, the hilly catchments were designated to be dominated by forest and ACRISOL soil type, two additional drivers of similarity. Read the full article HERE

A unifying view of climate change in the Sahel linking intra-seasonal, interannual and longer time scales

A Giannini, S Salack, T Lodoun, A Ali, A T Gaye and O Ndiaye ; Environmental Research Letters Volume 8 Number , 2013, 8 024010 doi:10.1088/1748-9326/8/2/024010. Consulter l'article intégral ICI.

We propose a re-interpretation of the oceanic influence on the climate of the African Sahel that is consistent across observations, 20th century simulations and 21st century projections, and that resolves the uncertainty in projections of precipitation change in this region: continued warming of the global tropical oceans increases the threshold for convection, potentially drying tropical land, but this 'upped ante' can be met if sufficient moisture is supplied in monsoon flow.

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Early warning systems for food security in West Africa: evolution, achievements and challenges

L. Genesio1, M. Bacci, C. Baron, B. Diarra, A. Di Vecchia, A. Alhassane, I. Hassane, M. Ndiaye, N. Philippon, V. Tarchiani, S. Traoré ; Atmospheric Science Letters Volume 12, Issue 1, pages 142–148, January/March 2011. Consulter l'article inétgral ICI.

In West Africa, early warning systems (EWSs) for food security have been widely recognized to have contributed, in the last 20 years, to an improved ability to deal with famine emergencies.

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An ex-ante evaluation of the use of seasonal climate forecasts for millet growers in SW Niger

  P. Roudier, B. Sultan, P. Quirion, C. Baron, A. Alhassane, S. B. Traoré, B. Muller ; International Journal of Climatology ; Volume 32, Issue 5, pages 759–771, April 2012. Consulter l'article intégral ICI

This work assesses the value of climate forecasts for millet growers in Niger. We quantify the potential value of three kinds of categorical forecasts assigning cumulated rainfall during the forthcoming rainy season by tercile (dry, normal, or humid): (i) a realistic imperfect tercile forecast; (ii) a perfect tercile forecast; and (iii) a perfect tercile forecast which includes a prediction of rainy season onset and offset dates.

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