Observational evidence of climate change on extreme events over East Africa

  • Joshua Ngaina | jngaina@gmail.com Department of Meteorology, University of Nairobi, Kenya.
  • Bethwel Mutai Department of Meteorology, University of Nairobi, Kenya.

Abstract

Examination of trend patterns of rainfall and temperature extremes over East Africa (EA) was based on graphical, regression and Mann-Kendall test approaches, while perturbations of rainfall, sunspot activity (SA) and southern oscillation index (SOI) extremes were computed using moving average methods. Annual total rainfall generally decreased with heavy and extreme precipitation rates confined within short spells during wet days. Observed maximum temperature extremes increased while minimum temperature extremes decreased with a statistically significant rise in the number of hot days and warm nights and a decrease in number of cool days and cold nights. However, space-time pattern of observed changes were not well organized. Perturbations of rainfall, SA and SOI indicated that extreme values were changing with increasing frequency and magnitude. Similarities in observed rainfall over EA illustrated the existence of homogeneous zones of climate change clustered as either coastal (with SA dominant), lake Victoria (unique to both SA and SOI), dry continental (SOI) or wet continental areas (both SA and SOI dominant).

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Author Biographies

Joshua Ngaina, Department of Meteorology, University of Nairobi
Research assistant and Post Graduate student at the Department of Meteorology
Bethwel Mutai, Department of Meteorology, University of Nairobi
Graduate assistant and Post Graduate student at the Department of Meteorology
Published
2013-10-21
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Section
Original Articles
Keywords:
rainfall, temperature, extremes, sunspot activity, southern oscillation index
Statistics
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How to Cite
Ngaina, J., & Mutai, B. (2013). Observational evidence of climate change on extreme events over East Africa. Global Meteorology, 2(1), e2. https://doi.org/10.4081/gm.2013.e2

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