LeHavreV1, France, Analysis, bibRecord, 000111

Low-frequency variability and zonal contrast in Sahel rainfall and Atlantic sea surface temperature teleconnections during the last century.

Identifieur interne : 000111 ( France/Analysis ); précédent : 000110; suivant : 000112

Low-frequency variability and zonal contrast in Sahel rainfall and Atlantic sea surface temperature teleconnections during the last century.

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 :

Theoretical and Applied Climatology [ 0177-798X ] ; 2015-07.

RBID : Hal:hal-01228760

Abstract

This study systematically examines teleconnections between Atlantic sea surface temperature (SST) and the west–east distribution of Sahel rainfall throughout the twentieth century, taking nonstationarity into account. Sahel rainfall variability of six selected rain gauges displays three dominant time scales: multi-decadal (>20 years), quasi-decadal (8–18 years) and interannual (2–8 years). Regarding their patterns of low-frequency scales, three coherent Sahelian subregions can be identified: the Atlantic Coast (Dakar), western–central Sahel (Nioro and Mopti) and eastern Sahel (Niamey, Maradi, Maine-Soroa). Cross-analyses combining spectral and multivariate analyses of 20 station-based data and West-African gridded rainfall data statistically confirm dissimilarities between the western and eastern Sahel. Western and eastern Sahel rainfall data are correlated with SSTs from different regions of the Atlantic Ocean, especially in the North and tropical South Atlantic. As determined by wavelet coherence and phase, in-phase relationship with North Atlantic SSTs only occurs in wet periods and at the multi- and quasi-decadal scales. This teleconnection depends on the time period and the time scale, displaying a NW–SE pattern, which suggests nonuniform modulations of meridional displacements of the Intertropical Convergence Zone (ITCZ). Tropical South Atlantic SST variability is often related to opposite patterns between the Gulf of Guinean Coast (in phase) and Sahel region (out of phase).Theoretical and Applied Climatology Theoretical and Applied Climatology LookInside

Url:

https://hal.archives-ouvertes.fr/hal-01228760

DOI: 10.1007/s00704-014-1229-5

Affiliations:

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Le document en format XML

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<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>
<idno type="DOI">10.1007/s00704-014-1229-5</idno>
<series><title level="j">Theoretical and Applied Climatology</title>
<idno type="ISSN">0177-798X</idno>
<imprint><date type="datePub">2015-07</date>
</imprint>
</series>
</biblStruct>
</sourceDesc>
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<profileDesc><textClass></textClass>
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<front><div type="abstract" xml:lang="en">This study systematically examines teleconnections between Atlantic sea surface temperature (SST) and the west–east distribution of Sahel rainfall throughout the twentieth century, taking nonstationarity into account. Sahel rainfall variability of six selected rain gauges displays three dominant time scales: multi-decadal (>20 years), quasi-decadal (8–18 years) and interannual (2–8 years). Regarding their patterns of low-frequency scales, three coherent Sahelian subregions can be identified: the Atlantic Coast (Dakar), western–central Sahel (Nioro and Mopti) and eastern Sahel (Niamey, Maradi, Maine-Soroa). Cross-analyses combining spectral and multivariate analyses of 20 station-based data and West-African gridded rainfall data statistically confirm dissimilarities between the western and eastern Sahel. Western and eastern Sahel rainfall data are correlated with SSTs from different regions of the Atlantic Ocean, especially in the North and tropical South Atlantic. As determined by wavelet coherence and phase, in-phase relationship with North Atlantic SSTs only occurs in wet periods and at the multi- and quasi-decadal scales. This teleconnection depends on the time period and the time scale, displaying a NW–SE pattern, which suggests nonuniform modulations of meridional displacements of the Intertropical Convergence Zone (ITCZ). Tropical South Atlantic SST variability is often related to opposite patterns between the Gulf of Guinean Coast (in phase) and Sahel region (out of phase).Theoretical and Applied Climatology Theoretical and Applied Climatology LookInside</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>

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Low-frequency variability and zonal contrast in Sahel rainfall and Atlantic sea surface temperature teleconnections during the last century.

Low-frequency variability and zonal contrast in Sahel rainfall and Atlantic sea surface temperature teleconnections during the last century.

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