Geospatial Trends and Decadal Anomalies in Extreme Rainfall over Uganda, East Africa
Trends and variability in series comprising the mean of fifteen highest daily rainfall intensities in each year were analyzed considering entire Uganda. The data were extracted from high-resolution (0.5° × 0.5°) gridded daily series of the Princeton Global Forcings covering the period 1948–2008. Var...
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Wiley
2016-01-01
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| Series: | Advances in Meteorology |
| Online Access: | http://dx.doi.org/10.1155/2016/6935912 |
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| author | Charles Onyutha |
| author_facet | Charles Onyutha |
| author_sort | Charles Onyutha |
| collection | DOAJ |
| description | Trends and variability in series comprising the mean of fifteen highest daily rainfall intensities in each year were analyzed considering entire Uganda. The data were extracted from high-resolution (0.5° × 0.5°) gridded daily series of the Princeton Global Forcings covering the period 1948–2008. Variability was analyzed using nonparametric anomaly indicator method and empirical orthogonal functions. Possible drivers of the rainfall variability were investigated. Trends were analyzed using the cumulative rank difference approach. Generally, rainfall was above the long-term mean from the mid-1950s to the late 1960s and again in the 1990s. From around 1970 to the late 1980s, rainfall was characterized by a decrease. The first and second dominant modes of variability correspond with the variation in Indian Ocean Dipole and North Atlantic Ocean index, respectively. The influence of Niño 3 on the rainfall variability of some parts of the country was also evident. The southern and northern parts had positive and negative trends, respectively. The null hypothesis H0 (no trend) was collectively rejected at the significance level of 5% in the series from 7 out of 168 grid points. The insights from the findings of this study are vital for planning and management of risk-based water resources applications. |
| format | Article |
| id | doaj-art-50edc81d84094d0187a984f1350c79ee |
| institution | Kabale University |
| issn | 1687-9309 1687-9317 |
| language | English |
| publishDate | 2016-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Meteorology |
| spelling | doaj-art-50edc81d84094d0187a984f1350c79ee2025-02-03T05:53:44ZengWileyAdvances in Meteorology1687-93091687-93172016-01-01201610.1155/2016/69359126935912Geospatial Trends and Decadal Anomalies in Extreme Rainfall over Uganda, East AfricaCharles Onyutha0Faculty of Technoscience, Muni University, P.O. Box 725, Arua, UgandaTrends and variability in series comprising the mean of fifteen highest daily rainfall intensities in each year were analyzed considering entire Uganda. The data were extracted from high-resolution (0.5° × 0.5°) gridded daily series of the Princeton Global Forcings covering the period 1948–2008. Variability was analyzed using nonparametric anomaly indicator method and empirical orthogonal functions. Possible drivers of the rainfall variability were investigated. Trends were analyzed using the cumulative rank difference approach. Generally, rainfall was above the long-term mean from the mid-1950s to the late 1960s and again in the 1990s. From around 1970 to the late 1980s, rainfall was characterized by a decrease. The first and second dominant modes of variability correspond with the variation in Indian Ocean Dipole and North Atlantic Ocean index, respectively. The influence of Niño 3 on the rainfall variability of some parts of the country was also evident. The southern and northern parts had positive and negative trends, respectively. The null hypothesis H0 (no trend) was collectively rejected at the significance level of 5% in the series from 7 out of 168 grid points. The insights from the findings of this study are vital for planning and management of risk-based water resources applications.http://dx.doi.org/10.1155/2016/6935912 |
| spellingShingle | Charles Onyutha Geospatial Trends and Decadal Anomalies in Extreme Rainfall over Uganda, East Africa Advances in Meteorology |
| title | Geospatial Trends and Decadal Anomalies in Extreme Rainfall over Uganda, East Africa |
| title_full | Geospatial Trends and Decadal Anomalies in Extreme Rainfall over Uganda, East Africa |
| title_fullStr | Geospatial Trends and Decadal Anomalies in Extreme Rainfall over Uganda, East Africa |
| title_full_unstemmed | Geospatial Trends and Decadal Anomalies in Extreme Rainfall over Uganda, East Africa |
| title_short | Geospatial Trends and Decadal Anomalies in Extreme Rainfall over Uganda, East Africa |
| title_sort | geospatial trends and decadal anomalies in extreme rainfall over uganda east africa |
| url | http://dx.doi.org/10.1155/2016/6935912 |
| work_keys_str_mv | AT charlesonyutha geospatialtrendsanddecadalanomaliesinextremerainfalloverugandaeastafrica |