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    Rainfall Variability in Africa

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    Date
    1979
    Author
    Ogallo, Laban
    Type
    Article
    Language
    en
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    Abstract
    Time series' of annual rainfall for 69 stations in Africa we~e analyzed for trends an? p~riodicities. Trend analysis showed that most of the annual series indicate some forr~s ~f ?sclllatlons .. rather than any particular trend. Use of binomial coefficients to smooth the senes m~lc~ted po.sltl.ve or negative trends in recent years in 20 series, but only four of these were. statlstl~al~y slgmfi.ca?t judging by the Spearman rank correlation test. These four stations were geographically distributed within those showing no significant trends. . . Assuming the generating process to be purely random, the prominent cycles revealed by the spectral analysis were 2.0-2.5 years and 2.7-3.3 years. In general, the larger observed cycles (3.5-4.4 years, 5.0 years, 6.0-6.5 years, 7.0-8.0 years and 10.0 years) were weak at the 0.05 significance level.
    URI
    http://erepository.uonbi.ac.ke:8080/xmlui/handle/123456789/38568
    Citation
    Monthly Weather Review, Vol.107, No. 9, September 1979
    Publisher
    Department of Meteorology, University of Nairobi
    Subject
    Rainfall
    Africa
    Variability
    Description
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    • Faculty of Science & Technology (FST) [4250]

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