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Journal of Applied Sciences
  Year: 2007 | Volume: 7 | Issue: 6 | Page No.: 913-917
DOI: 10.3923/jas.2007.913.917
 
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Temporal and Spatial Variability of Ozone Concentration over Four African Stations

M.L. Akinyemi and E.O. Oladiran

Abstract:
The temporal and spatial variability of ozone at four different locations over Africa were studied using satellite data from 1997 to 2002. The stations were Lagos and Dakar in the northern tropics, Kinshasa and Nampula in the southern tropics. The analysis revealed both high and low frequency time component. The temporal variation of ozone was of the high frequency component, while the seasonal oscillations were either annual or biannual. Annual seasonal oscillations were observed at Lagos and Dakar with oscillation period varying between 295 and 375 days, while biannual seasonal oscillations were observed at Kinshasa and Nampula with oscillation period varying between 120 and 200 days. Ozone temporal oscillation periods in all the four locations were between 2 and 6 days. The temporal amplitude varied between 1.0 and 6.5 DU. The observation of the effect of the Quassi Biennial Oscillation (QBO) was more prominent at Lagos than the other three stations. In the years of QBO occurrences, the annual mean of ozone concentration at Lagos were higher than those of Dakar by an average value of 10 DU. While the difference in the years of non-QBO were marginal with an average value of ±1.4 DU. Seasonal and annual variations of ozone concentration over the tropics had higher correlation with location than the temporal variation. Temporal variation was found to be less dependent on the spatial variation.
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How to cite this article:

M.L. Akinyemi and E.O. Oladiran , 2007. Temporal and Spatial Variability of Ozone Concentration over Four African Stations. Journal of Applied Sciences, 7: 913-917.

DOI: 10.3923/jas.2007.913.917

URL: https://scialert.net/abstract/?doi=jas.2007.913.917

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