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Atmosphere 2016, 7(11), 150; doi:10.3390/atmos7110150

Patterns of Dekadal Rainfall Variation Over a Selected Region in Lake Victoria Basin, Uganda

1
Department of Geography, Geoinformatics and Climatic Sciences, Makerere University, P.O. Box 7062 Kampala, Uganda
2
Uni Research Climate, Bjerknes Centre for Climate Research, Allegaten 70, 5007 Bergen, Norway
3
Geophysical Institute, University of Bergen, and Bjerknes Centre for Climate Research, Allegaten 70, 5007 Bergen, Norway
4
Uganda National Meteorological Authority, P.O. Box 7025 Kampala, Uganda
5
School of Atmospheric Sciences, and Key Laboratory of Mesoscale Severe Weather of Ministry of Education, Nanjing University, Nanjing 210023, China
6
Department of General Studies, Dar es Salaam Institute of Technology, P.O. Box 2958 Dar-es-Salaam, Tanzania
These authors contributed equally to this work.
*
Authors to whom correspondence should be addressed.
Academic Editor: Nicole Mölders
Received: 15 September 2016 / Revised: 4 November 2016 / Accepted: 15 November 2016 / Published: 22 November 2016
(This article belongs to the Special Issue Global Precipitation with Climate Change)
View Full-Text   |   Download PDF [1427 KB, uploaded 23 November 2016]   |  

Abstract

Understanding variations in rainfall in tropical regions is important due to its impacts on water resources, health and agriculture. This study assessed the dekadal rainfall patterns and rain days to determine intra-seasonal rainfall variability during the March–May season using the Mann–Kendall ( M K ) trend test and simple linear regression ( S L R ) over the period 2000–2015. Results showed an increasing trend of both dekadal rainfall amount and rain days (third and seventh dekads). The light rain days ( S L R = 0.181; M K = 0.350) and wet days ( S L R = 0.092; M K = 0.118) also depict an increasing trend. The rate of increase of light rain days and wet days during the third dekad (light rain days: S L R = 0.020; M K = 0.279 and wet days: S L R = 0.146; M K = 0.376) was slightly greater than during the seventh dekad (light rain days: S L R = 0.014; M K = 0.018 and wet days: S L R = 0.061; M K = 0.315) dekad. Seventy-four percent accounted for 2–4 consecutive dry days, but no significant trend was detected. The extreme rainfall was increasing over the third ( M K = 0.363) and seventh ( M K = 0.429) dekads. The rainfall amount and rain days were highly correlated (r: 0.43–0.72). View Full-Text
Keywords: rain days; wet days; light rain days; dekadal rainfall; intra-season rainfall variation rain days; wet days; light rain days; dekadal rainfall; intra-season rainfall variation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Mugume, I.; Mesquita, M.D.S.; Basalirwa, C.; Bamutaze, Y.; Reuder, J.; Nimusiima, A.; Waiswa, D.; Mujuni, G.; Tao, S.; Jacob Ngailo, T. Patterns of Dekadal Rainfall Variation Over a Selected Region in Lake Victoria Basin, Uganda. Atmosphere 2016, 7, 150.

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