Variabilité basse-fréquence des précipitations au Sahel et des températures de surface de l'océan Atlantique au cours du dernier siècle.
Identifieur interne : 000502 ( France/Analysis ); précédent : 000501; suivant : 000503Variabilité basse-fréquence des précipitations au Sahel et des températures de surface de l'océan Atlantique au cours du dernier siècle.
Auteurs : B. Dieppois [France] ; A. Durand [France] ; M. Fournier [France] ; A. Diedhiou [France] ; Bernard Fontaine [France] ; N. Massei [France] ; Z. Nouaceur [France] ; D. Sebag [France]Source :
Descripteurs français
- mix :
- Wicri :
- topic : Sahel.
Abstract
Cette étude examine les téléconnexions entre les températures de surface de la mer (TSM) de l'océan Atlantique et la distribution zonale des précipitations au Sahel au cours du dernier siècle. Depuis la fin des années 60, les précipitations d'Afrique de l'Ouest présentent une tendance négative sur l'ensemble de la bande sahélienne. Pourtant, trois types de variabilité basse-fréquence des précipitations sahélienne sont observés : la côte atlantique (Dakar), le Sahel central (Nioro du Sahel et Mopti) et le Sahel oriental (Niamey, Maradi, Maïné-Soroa). Au cours du XXème siècle, les précipitations sont rarement reliées simultanément avec les TSM de l'Atlantique Nord et Tropical Sud. Aux échelles multi- et quasi-décennale, dans les années 50 et depuis les années 90, un réchauffement des TSM de l'Atlantique Nord (AMO+ : Atlantic Multidecadal Oscillation) contribue à l'augmentation des précipitations sahéliennes de la côte Atlantique à Mopti ou Niamey (6°W/2°E). L'impact des TSM de l'Atlantique Tropical Sud dépend de la période d'observation et de l'échelle de variabilité.
Url:
Affiliations:
- France
- Auvergne-Rhône-Alpes, Basse-Normandie, Haute-Normandie, Rhône-Alpes, Région Bourgogne, Région Normandie
- Caen, Dijon, Grenoble, Le Havre, Rouen
- Université Joseph Fourier, Université de Bourgogne, Université de Bourgogne Franche-Comté, Université de Caen Basse-Normandie, Université de Grenoble, Université de Rouen, Université du Havre
Links toward previous steps (curation, corpus...)
- to stream Hal, to step Corpus: 000794
- to stream Hal, to step Curation: 000794
- to stream Hal, to step Checkpoint: 000288
- to stream Main, to step Merge: 000565
- to stream Main, to step Curation: 000561
- to stream Main, to step Exploration: 000561
- to stream France, to step Extraction: 000502
Links to Exploration step
Hal:hal-00757465Le document en format XML
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Nouaceur</name><affiliation wicri:level="1"><hal:affiliation type="laboratory" xml:id="struct-97036" status="VALID"><orgName>Identité et différenciation des espaces, de l'environnement et des sociétés</orgName><orgName type="acronym">IDEES</orgName><desc><address><addrLine>MTG - IDEES - Batiment IRED Université de ROUEN 7 Rue Thomas Becket 76821 MONT SAINT AIGNAN FRANCE</addrLine><country key="FR"></country></address><ref type="url">http://www.umr-idees.fr/</ref></desc><listRelation><relation active="#struct-300266" type="direct"></relation><relation active="#struct-300317" type="direct"></relation><relation active="#struct-300318" type="direct"></relation><relation name="UMR6266" active="#struct-441569" type="direct"></relation></listRelation><tutelles><tutelle active="#struct-300266" type="direct"><org type="institution" xml:id="struct-300266" status="INCOMING"><orgName>Université de Caen Basse-Normandie</orgName><desc><address><country key="FR"></country></address></desc></org></tutelle><tutelle active="#struct-300317" type="direct"><org type="institution" xml:id="struct-300317" status="VALID"><orgName>Université du Havre</orgName><desc><address><country key="FR"></country></address></desc></org></tutelle><tutelle active="#struct-300318" type="direct"><org type="institution" xml:id="struct-300318" status="VALID"><orgName>Université de Rouen</orgName><desc><address><addrLine> 1 rue Thomas Becket - 76821 Mont-Saint-Aignan</addrLine><country key="FR"></country></address><ref type="url">http://www.univ-rouen.fr/</ref></desc></org></tutelle><tutelle name="UMR6266" active="#struct-441569" type="direct"><org type="institution" xml:id="struct-441569" status="VALID"><idno type="ISNI">0000000122597504</idno><idno type="IdRef">02636817X</idno><orgName>Centre National de la Recherche Scientifique</orgName><orgName type="acronym">CNRS</orgName><date type="start">1939-10-19</date><desc><address><country key="FR"></country></address><ref type="url">http://www.cnrs.fr/</ref></desc></org></tutelle></tutelles></hal:affiliation><country>France</country><placeName><settlement type="city">Caen</settlement><region type="region" nuts="2">Basse-Normandie</region></placeName><orgName type="university">Université de Caen Basse-Normandie</orgName><placeName><settlement type="city">Le Havre</settlement><region type="region" nuts="2">Région Normandie</region><region type="old region" nuts="2">Haute-Normandie</region></placeName><orgName type="university">Université du Havre</orgName><placeName><settlement type="city">Rouen</settlement><region type="region" nuts="2">Région Normandie</region><region type="old region" nuts="2">Haute-Normandie</region></placeName><orgName type="university">Université de Rouen</orgName></affiliation></author><author><name sortKey="Sebag, D" sort="Sebag, D" uniqKey="Sebag D" first="D." last="Sebag">D. Sebag</name><affiliation wicri:level="1"><hal:affiliation type="laboratory" xml:id="struct-847" status="VALID"><orgName>Morphodynamique continentale et côtière</orgName><orgName type="acronym">MCC</orgName><desc><address><addrLine>24 Rue des tilleuls 14000 CAEN</addrLine><country key="FR"></country></address><ref type="url">http://WWW.geos.unicaen.fr</ref></desc><listRelation><relation active="#struct-300045" type="direct"></relation><relation active="#struct-300266" type="direct"></relation><relation active="#struct-300318" type="direct"></relation><relation name="UMR6143" active="#struct-441569" type="direct"></relation></listRelation><tutelles><tutelle active="#struct-300045" type="direct"><org type="institution" xml:id="struct-300045" status="VALID"><orgName>INSU</orgName><desc><address><country key="FR"></country></address></desc></org></tutelle><tutelle active="#struct-300266" type="direct"><org type="institution" xml:id="struct-300266" status="INCOMING"><orgName>Université de Caen Basse-Normandie</orgName><desc><address><country key="FR"></country></address></desc></org></tutelle><tutelle active="#struct-300318" type="direct"><org type="institution" xml:id="struct-300318" status="VALID"><orgName>Université de Rouen</orgName><desc><address><addrLine> 1 rue Thomas Becket - 76821 Mont-Saint-Aignan</addrLine><country key="FR"></country></address><ref type="url">http://www.univ-rouen.fr/</ref></desc></org></tutelle><tutelle name="UMR6143" active="#struct-441569" type="direct"><org type="institution" xml:id="struct-441569" status="VALID"><idno type="ISNI">0000000122597504</idno><idno type="IdRef">02636817X</idno><orgName>Centre National de la Recherche Scientifique</orgName><orgName type="acronym">CNRS</orgName><date type="start">1939-10-19</date><desc><address><country key="FR"></country></address><ref type="url">http://www.cnrs.fr/</ref></desc></org></tutelle></tutelles></hal:affiliation><country>France</country><placeName><settlement type="city">Caen</settlement><region type="region" nuts="2">Basse-Normandie</region></placeName><orgName type="university">Université de Caen Basse-Normandie</orgName><placeName><settlement type="city">Rouen</settlement><region type="region" nuts="2">Région Normandie</region><region type="old region" nuts="2">Haute-Normandie</region></placeName><orgName type="university">Université de Rouen</orgName></affiliation></author></analytic></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="mix" xml:lang="fr"><term>Sahel</term><term>TSM Atlantique</term><term>précipitations</term><term>téléconnexions</term><term>variabilité climatique</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Sahel</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="fr">Cette étude examine les téléconnexions entre les températures de surface de la mer (TSM) de l'océan Atlantique et la distribution zonale des précipitations au Sahel au cours du dernier siècle. Depuis la fin des années 60, les précipitations d'Afrique de l'Ouest présentent une tendance négative sur l'ensemble de la bande sahélienne. Pourtant, trois types de variabilité basse-fréquence des précipitations sahélienne sont observés : la côte atlantique (Dakar), le Sahel central (Nioro du Sahel et Mopti) et le Sahel oriental (Niamey, Maradi, Maïné-Soroa). Au cours du XXème siècle, les précipitations sont rarement reliées simultanément avec les TSM de l'Atlantique Nord et Tropical Sud. Aux échelles multi- et quasi-décennale, dans les années 50 et depuis les années 90, un réchauffement des TSM de l'Atlantique Nord (AMO+ : Atlantic Multidecadal Oscillation) contribue à l'augmentation des précipitations sahéliennes de la côte Atlantique à Mopti ou Niamey (6°W/2°E). L'impact des TSM de l'Atlantique Tropical Sud dépend de la période d'observation et de l'échelle de variabilité.</div></front></TEI><affiliations><list><country><li>France</li></country><region><li>Auvergne-Rhône-Alpes</li><li>Basse-Normandie</li><li>Haute-Normandie</li><li>Rhône-Alpes</li><li>Région Bourgogne</li><li>Région Normandie</li></region><settlement><li>Caen</li><li>Dijon</li><li>Grenoble</li><li>Le Havre</li><li>Rouen</li></settlement><orgName><li>Université Joseph Fourier</li><li>Université de Bourgogne</li><li>Université de Bourgogne Franche-Comté</li><li>Université de Caen Basse-Normandie</li><li>Université de Grenoble</li><li>Université de Rouen</li><li>Université du Havre</li></orgName></list><tree><country name="France"><region name="Basse-Normandie"><name sortKey="Dieppois, B" sort="Dieppois, B" uniqKey="Dieppois B" first="B." last="Dieppois">B. Dieppois</name></region><name sortKey="Diedhiou, A" sort="Diedhiou, A" uniqKey="Diedhiou A" first="A." last="Diedhiou">A. Diedhiou</name><name sortKey="Durand, A" sort="Durand, A" uniqKey="Durand A" first="A." last="Durand">A. Durand</name><name sortKey="Fontaine, Bernard" sort="Fontaine, Bernard" uniqKey="Fontaine B" first="Bernard" last="Fontaine">Bernard Fontaine</name><name sortKey="Fournier, M" sort="Fournier, M" uniqKey="Fournier M" first="M." last="Fournier">M. Fournier</name><name sortKey="Massei, N" sort="Massei, N" uniqKey="Massei N" first="N." last="Massei">N. Massei</name><name sortKey="Nouaceur, Z" sort="Nouaceur, Z" uniqKey="Nouaceur Z" first="Z." last="Nouaceur">Z. Nouaceur</name><name sortKey="Sebag, D" sort="Sebag, D" uniqKey="Sebag D" first="D." last="Sebag">D. Sebag</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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