Contrasting changes in vegetation and northeasterly trade wind intensity during Heinrich Stadial 1 megadroughts in the west African Sahel region

2012 ◽  
Vol 279-280 ◽  
pp. 62-63
Author(s):  
Ilham Bouimetarhan
2015 ◽  
Vol 142 (694) ◽  
pp. 16-29 ◽  
Author(s):  
Allison B. Collow ◽  
Virendra P. Ghate ◽  
Mark A. Miller ◽  
Lynne C. Trabachino

2007 ◽  
Vol 94 (1) ◽  
pp. 87-96 ◽  
Author(s):  
Oumarou Badini ◽  
Claudio O. Stöckle ◽  
Jim W. Jones ◽  
Roger Nelson ◽  
Amadou Kodio ◽  
...  

Author(s):  
Lameen Souag

Songhay is a language group of the West African Sahel region with more than four million speakers, distributed mainly in western Niger and northeastern Mali along the Niger River, but including outlying pockets scattered as far afield as Algeria, Ghana, and Sudan. Strong contact effects along the periphery—notably involving Berber in the north and Bariba and Hausa in the southeast, and Mande languages at an earlier stage—have resulted in a remarkable situation where different varieties may have nearly identical basic vocabularies but conspicuously different typologies. Cladistic and lexical evidence shows that much of the observed variation reflects contact influences quite different from those obtaining today. This chapter examines particularly morphology and syntax across the family. Special attention is given to innovations distinguishing the three principal subgroups (Eastern, Western, and Northern), and to the motivations for these changes.


2021 ◽  
Vol 39 ◽  
pp. 103110
Author(s):  
L. Champion ◽  
N. Gestrich ◽  
K. MacDonald ◽  
L. Nieblas-Ramirez ◽  
D.Q. Fuller

Food Policy ◽  
2019 ◽  
Vol 83 ◽  
pp. 39-47
Author(s):  
Federica Alfani ◽  
Andrew Dabalen ◽  
Peter Fisker ◽  
Vasco Molini

2004 ◽  
Vol 85 (1) ◽  
pp. 61-77 ◽  
Author(s):  
S.M. Haefele ◽  
M.C.S. Wopereis ◽  
A.-M. Schloebohm ◽  
H. Wiechmann

Author(s):  
Guillaume Chagnaud ◽  
Geremy Panthou ◽  
Theo Vischel ◽  
Thierry Lebel

Abstract The West African Sahel has been facing for more than 30 years an increase in extreme rainfalls with strong socio-economic impacts. This situation challenges decision-makers to define adaptation strategies in a rapidly changing climate. The present study proposes (i) a quantitative characterization of the trends in extreme rainfalls at the regional scale, (ii) the translation of the trends into metrics that can be used by hydrological risk managers, (iii) elements for understanding the link between the climatology of extreme and mean rainfall. Based on a regional non-stationary statistical model applied to in-situ daily rainfall data over the period 1983-2015, we show that the region-wide increasing trend in extreme rainfalls is highly significant. The change in extreme value distribution reflects an increase in both the mean and variability, producing a 5%/decade increase in extreme rainfall intensity whatever the return period. The statistical framework provides operational elements for revising the design methods of hydraulic structures which most often assume a stationary climate. Finally, the study shows that the increase in extreme rainfall is more attributable to an increase in the intensity of storms (80%) than to their occurrence (20%), reflecting a major disruption from the decadal variability of the rainfall regime documented in the region since 1950.


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