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contributor authorOgallo, Laban
date accessioned2017-06-09T16:02:34Z
date available2017-06-09T16:02:34Z
date copyright1979/09/01
date issued1979
identifier issn0027-0644
identifier otherams-59527.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4200095
description abstractTime series of annual rainfall for 69 stations in Africa were analyzed for trends and periodicities. Trend analysis showed that most of the annual series indicate some forms of oscillations rather than any particular trend. Use of binomial coefficients to smooth the series indicated positive or negative trends in recent years in 20 series, but only four of these were statistically significant 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.
publisherAmerican Meteorological Society
titleRainfall Variability in Africa
typeJournal Paper
journal volume107
journal issue9
journal titleMonthly Weather Review
identifier doi10.1175/1520-0493(1979)107<1133:RVIA>2.0.CO;2
journal fristpage1133
journal lastpage1139
treeMonthly Weather Review:;1979:;volume( 107 ):;issue: 009
contenttypeFulltext


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