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    The Spatial Coherence of African Rainfall Anomalies: Interhemispheric Teleconnections

    Source: Journal of Climate and Applied Meteorology:;1986:;Volume( 025 ):;Issue: 010::page 1365
    Author:
    Nicholson, Sharon E.
    DOI: 10.1175/1520-0450(1986)025<1365:TSCOAR>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The spatial patterns of rainfall variability over the African continent are examined using a regionally averaged data set comprising the records of 1087 stations. Typical rainfall departure patterns, or anomaly types, are derived using a linear correlation method to assess the similarity of annual departure maps for the years 1901 to 1973. For the region north of the equator, most years fall into one of six types, four of which show a strong opposition between equatorial and subtropical latitudes and two of which show departures of the same sign over the whole region. For the continent as a whole, six types are also derived. These reflect the patterns derived using northern Africa alone, with conditions in the southern subtropics resembling those in subtropical latitudes north of the equator. Continentally, two principal spatial patterns of rainfall variation are evident: anomalies of the same sign over most of Africa and anomalies of the opposite sign in equatorial and subtropical latitudes. Thus, strong interhemispheric teleconnections in rainfall are apparent. The results are discussed in the framework of common continental factors in rainfall variability and in regional climate dynamics.
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      The Spatial Coherence of African Rainfall Anomalies: Interhemispheric Teleconnections

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4146245
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    contributor authorNicholson, Sharon E.
    date accessioned2017-06-09T14:01:23Z
    date available2017-06-09T14:01:23Z
    date copyright1986/10/01
    date issued1986
    identifier issn0733-3021
    identifier otherams-11059.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4146245
    description abstractThe spatial patterns of rainfall variability over the African continent are examined using a regionally averaged data set comprising the records of 1087 stations. Typical rainfall departure patterns, or anomaly types, are derived using a linear correlation method to assess the similarity of annual departure maps for the years 1901 to 1973. For the region north of the equator, most years fall into one of six types, four of which show a strong opposition between equatorial and subtropical latitudes and two of which show departures of the same sign over the whole region. For the continent as a whole, six types are also derived. These reflect the patterns derived using northern Africa alone, with conditions in the southern subtropics resembling those in subtropical latitudes north of the equator. Continentally, two principal spatial patterns of rainfall variation are evident: anomalies of the same sign over most of Africa and anomalies of the opposite sign in equatorial and subtropical latitudes. Thus, strong interhemispheric teleconnections in rainfall are apparent. The results are discussed in the framework of common continental factors in rainfall variability and in regional climate dynamics.
    publisherAmerican Meteorological Society
    titleThe Spatial Coherence of African Rainfall Anomalies: Interhemispheric Teleconnections
    typeJournal Paper
    journal volume25
    journal issue10
    journal titleJournal of Climate and Applied Meteorology
    identifier doi10.1175/1520-0450(1986)025<1365:TSCOAR>2.0.CO;2
    journal fristpage1365
    journal lastpage1381
    treeJournal of Climate and Applied Meteorology:;1986:;Volume( 025 ):;Issue: 010
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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