Relations entre la pluviométrie au Sahel central et divers indices climatiques sur l’Atlantique: exemple de la station de Maïné-Soroa

Bastien Dieppois; Alain Durand; Matthieu Fournier; Nicolas Massei; B. Hassane

Relations entre la pluviométrie au Sahel central et divers indices climatiques sur l’Atlantique: exemple de la station de Maïné-Soroa

Bastien Dieppois, Alain Durand, Matthieu Fournier, Nicolas Massei, B. Hassane

Research output: Chapter in Book/Report/Conference proceeding › Conference proceeding › peer-review

Abstract

Pluviometry variability at Maïné-Soroa station (SE Niger) shows correlation at 0.75 with the Central Sahel pluviometric index established by Lebel and Ali (2009) from 1950 to 2005. Three mains periods were indetified : wet (1950-1967), arid (1968-1999) and semi-arid (1988/89-2005). Continuous Wavelet Transform was used to evaluate forced (climatic) variability of pluviometric signal. An intensification of the 2-4 years and 5-8 years frequency bands is observed during wet and semiarid periods. Conversely, these bands become weaken and the 12-18 years band appears stronger during arid period. Moreover, Wavelet coherence and Phase are used to identify forcing climate indices. During the wet period, climate indices (NAO and Tropical North Atlantic SST) are coherent and in phase with pluviometry, while during the arid period, climate indices (NAO, Tropical North and South Atlantic SSTs) are coherent with pluviometry but out of phases.
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Original language	French
Title of host publication	Risques et Changement Climatiques
Subtitle of host publication	XIII Colloque de L'Association Internationale de Climatologie
Publisher	Association Internationale de Climatologie
Pages	173-178
Number of pages	6
Volume	23
ISBN (Print)	978-2-907696-16-6
Publication status	Published - 2010
Externally published	Yes
Event	XXIIIème COLLOQUE DE L’ASSOCIATION INTERNATIONALE DE CLIMATOLOGIE: 23rd Association Internacionale de Climatologie Conference - Rennes, France Duration: 1 Sept 2010 → 4 Sept 2010

Conference

Conference	XXIIIème COLLOQUE DE L’ASSOCIATION INTERNATIONALE DE CLIMATOLOGIE
Country/Territory	France
City	Rennes
Period	1/09/10 → 4/09/10

Access to Document

http://www.climato.be/aic/colloques/actes/rennes2010_actes.pdf

Cite this

Dieppois, B., Durand, A., Fournier, M., Massei, N., & Hassane, B. (2010). Relations entre la pluviométrie au Sahel central et divers indices climatiques sur l’Atlantique: exemple de la station de Maïné-Soroa. In Risques et Changement Climatiques: XIII Colloque de L'Association Internationale de Climatologie (Vol. 23, pp. 173-178). Association Internationale de Climatologie. http://www.climato.be/aic/colloques/actes/rennes2010_actes.pdf

Relations entre la pluviométrie au Sahel central et divers indices climatiques sur l’Atlantique : exemple de la station de Maïné-Soroa. / Dieppois, Bastien; Durand, Alain; Fournier, Matthieu et al.

Risques et Changement Climatiques: XIII Colloque de L'Association Internationale de Climatologie. Vol. 23 Association Internationale de Climatologie, 2010. p. 173-178.

Research output: Chapter in Book/Report/Conference proceeding › Conference proceeding › peer-review

Dieppois, B, Durand, A, Fournier, M, Massei, N & Hassane, B 2010, Relations entre la pluviométrie au Sahel central et divers indices climatiques sur l’Atlantique: exemple de la station de Maïné-Soroa. in Risques et Changement Climatiques: XIII Colloque de L'Association Internationale de Climatologie. vol. 23, Association Internationale de Climatologie, pp. 173-178, XXIIIème COLLOQUE DE L’ASSOCIATION INTERNATIONALE DE CLIMATOLOGIE, Rennes, France, 1/09/10. <http://www.climato.be/aic/colloques/actes/rennes2010_actes.pdf>

Dieppois, Bastien ; Durand, Alain ; Fournier, Matthieu et al. / Relations entre la pluviométrie au Sahel central et divers indices climatiques sur l’Atlantique : exemple de la station de Maïné-Soroa. Risques et Changement Climatiques: XIII Colloque de L'Association Internationale de Climatologie. Vol. 23 Association Internationale de Climatologie, 2010. pp. 173-178

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abstract = "Pluviometry variability at Ma{\"i}n{\'e}-Soroa station (SE Niger) shows correlation at 0.75 with the Central Sahel pluviometric index established by Lebel and Ali (2009) from 1950 to 2005. Three mains periods were indetified : wet (1950-1967), arid (1968-1999) and semi-arid (1988/89-2005). Continuous Wavelet Transform was used to evaluate forced (climatic) variability of pluviometric signal. An intensification of the 2-4 years and 5-8 years frequency bands is observed during wet and semiarid periods. Conversely, these bands become weaken and the 12-18 years band appears stronger during arid period. Moreover, Wavelet coherence and Phase are used to identify forcing climate indices. During the wet period, climate indices (NAO and Tropical North Atlantic SST) are coherent and in phase with pluviometry, while during the arid period, climate indices (NAO, Tropical North and South Atlantic SSTs) are coherent with pluviometry but out of phases.Discover the world's research",

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AU - Hassane, B.

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AB - Pluviometry variability at Maïné-Soroa station (SE Niger) shows correlation at 0.75 with the Central Sahel pluviometric index established by Lebel and Ali (2009) from 1950 to 2005. Three mains periods were indetified : wet (1950-1967), arid (1968-1999) and semi-arid (1988/89-2005). Continuous Wavelet Transform was used to evaluate forced (climatic) variability of pluviometric signal. An intensification of the 2-4 years and 5-8 years frequency bands is observed during wet and semiarid periods. Conversely, these bands become weaken and the 12-18 years band appears stronger during arid period. Moreover, Wavelet coherence and Phase are used to identify forcing climate indices. During the wet period, climate indices (NAO and Tropical North Atlantic SST) are coherent and in phase with pluviometry, while during the arid period, climate indices (NAO, Tropical North and South Atlantic SSTs) are coherent with pluviometry but out of phases.Discover the world's research

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