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    West African Monsoon Dynamics and Eastern Equatorial Atlantic and Pacific SST Anomalies (1970–88)

    Source: Journal of Climate:;1998:;volume( 011 ):;issue: 008::page 1874
    Author:
    Janicot, Serge
    ,
    Harzallah, Ali
    ,
    Fontaine, Bernard
    ,
    Moron, Vincent
    DOI: 10.1175/1520-0442-11.8.1874
    Publisher: American Meteorological Society
    Abstract: The Laboratoire de Météorologie Dynamique atmospheric GCM is used to investigate relationships between West African monsoon dynamics and SST anomalies in the eastern equatorial Atlantic and Pacific for the period 1970?88. Positive SST anomalies in the eastern equatorial Pacific, mainly associated with a larger east?west divergent circulation over the tropical Atlantic, are found to coincide with negative rainfall anomalies over West Africa. This is the case for the composite ENSO warm episodes of 1972, 1976, 1982, and 1983. By contrast, positive SST anomalies in the eastern equatorial Atlantic are accompanied by a southward shift of the intertropical convergence zone along with negative rainfall anomalies in the Sahel and positive rainfall anomalies in the Guinean region. This was the case in 1987. The ENSO warm event during this year had apparently no significant impact on West African monsoon dynamics. A zonal atmospheric coupling associated with differences of SST anomalies between the eastern equatorial Pacific and the Atlantic is evident in the period 1970?88. Positive (negative) phases of this coupling could enhance the impact of ENSO warm (cold) events on West African monsoon dynamics.
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      West African Monsoon Dynamics and Eastern Equatorial Atlantic and Pacific SST Anomalies (1970–88)

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4209067
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    contributor authorJanicot, Serge
    contributor authorHarzallah, Ali
    contributor authorFontaine, Bernard
    contributor authorMoron, Vincent
    date accessioned2017-06-09T16:25:27Z
    date available2017-06-09T16:25:27Z
    date copyright1998/08/01
    date issued1998
    identifier issn0894-8755
    identifier otherams-6760.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4209067
    description abstractThe Laboratoire de Météorologie Dynamique atmospheric GCM is used to investigate relationships between West African monsoon dynamics and SST anomalies in the eastern equatorial Atlantic and Pacific for the period 1970?88. Positive SST anomalies in the eastern equatorial Pacific, mainly associated with a larger east?west divergent circulation over the tropical Atlantic, are found to coincide with negative rainfall anomalies over West Africa. This is the case for the composite ENSO warm episodes of 1972, 1976, 1982, and 1983. By contrast, positive SST anomalies in the eastern equatorial Atlantic are accompanied by a southward shift of the intertropical convergence zone along with negative rainfall anomalies in the Sahel and positive rainfall anomalies in the Guinean region. This was the case in 1987. The ENSO warm event during this year had apparently no significant impact on West African monsoon dynamics. A zonal atmospheric coupling associated with differences of SST anomalies between the eastern equatorial Pacific and the Atlantic is evident in the period 1970?88. Positive (negative) phases of this coupling could enhance the impact of ENSO warm (cold) events on West African monsoon dynamics.
    publisherAmerican Meteorological Society
    titleWest African Monsoon Dynamics and Eastern Equatorial Atlantic and Pacific SST Anomalies (1970–88)
    typeJournal Paper
    journal volume11
    journal issue8
    journal titleJournal of Climate
    identifier doi10.1175/1520-0442-11.8.1874
    journal fristpage1874
    journal lastpage1882
    treeJournal of Climate:;1998:;volume( 011 ):;issue: 008
    contenttypeFulltext
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