Trends and Periodicities in East African Rainfall Data

Rodhe, Håkan; Virji, Hassan

doi:10.1175/1520-0493(1976)104<0307:tapiea>2.0.co;2

Cited by 103 publications

(77 citation statements)

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“…Further still, CV is low for high-rainfall stations and high for low-rainfall stations (Fig. 4b) which, according to Rodhe and Virji (1976), indicates high reliability and low reliability at those stations, respectively. In the studies of De Luis et al (2000) and Türkeş (1996), it is noted that areas with coefficients of variation higher than 30 % are likely to have more frequent and severe droughts and floods.…”

Section: Annual Rainfall Variabilitymentioning

confidence: 99%

“…Such information is still scarce because of the few studies that have analyzed the relationship of climate patterns and water management among others especially in the East Africa region. For example, Kampata et al (2008), New et al (2006), Schreck and Semazzi (2004), Kruger and Shongwe (2004), Mahe et al(2001), King'uyu et al (2000), Nicholson (1996), Ogallo (1993), Beltrando (1990), Rodhe and Virji (1976), and Samson (1952) are among the most recent studies concerning long-term climatological trends that have fo-cused on surface air temperature and precipitation in Africa. From these and other studies, a range of potential climatic impacts on water management for various geo-graphic areas, flood prevention and control, drought man-agement, food and fiber production, etc.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of mid-twentieth century rainfall trends and variability over southwestern Uganda

Nsubuga

Olwoch

Rautenbach

et al. 2013

Theor Appl Climatol

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A methodology has been applied to investigate the spatial variability and trends existent in a mid-twentieth century climatic time series (for the period recorded by 58 climatic stations in the Albert-Victoria water management area in Uganda. Data were subjected to quality checks before further processing. In the present work, temporal trends were analyzed using Mann-Kendall and linear regression methods. Heterogeneity of monthly rainfall was investigated using the precipitation concentration index (PCI). Results revealed that 53 % of stations have positive trends where 25 % are statistically significant and 45 % of stations have negative trends with 23 % being statistically significant. Very strong trends at 99 % significance level were revealed at 12 stations.

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Section: Annual Rainfall Variabilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of mid-twentieth century rainfall trends and variability over southwestern Uganda

Nsubuga

Olwoch

Rautenbach

et al. 2013

Theor Appl Climatol

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“…The increase in rainfall subsequent to 1961 has been noted in other studies, although Rodhe and Virji (1976) found no evidence of long-term trends in annual rainfall at six rain gauges around Lake Victoria. Farmer (1981) found evidence of a step-like increase in mean ON rainfall over the Kenyan area of Lake Victoria in the early 1960s.…”

Section: The Persistence Of High Lake Victoria Levels After 1961mentioning

confidence: 99%

“…Most studies of this event have only dealt with the characteristics of the rainfall and hydrological anomalies, although Reverdin et al (1986) and Flohn (1987) did touch upon the climatological origins of the event. Reverdin et al (1986) investigated the interannual variability of surface observations in the equatorial Indian Ocean between 1954and 1976. They identified 1961, 1967and 1963 as the three years with the largest cloudiness anomalies, synchronous with positive SST anomalies in the central Indian Ocean and negative anomalies further to the east.…”

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confidence: 99%

Extreme Rainfall Events and Lake Level Changes in East Africa: Recent Events and Historical Precedents

Conway

2002

Advances in Global Change Research

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“…Earlier studies (Rodhe and Virji, 1976;Ropelewski and Halpert, 1987;Ogallo et al, 1994) have also shown the existence of oscillatory peaks in East African rainfall of 2 to 8 years. The decadal signal is found in this study is however only significant from 1920 to 1955.…”

Section: Variability Of Mac Amplitudementioning

confidence: 89%

East African rainfall seasonality based on modulated annual cycle (MAC)

Owiti¹

2012

Int. J. Phys. Sci.

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The spatial and temporal variability of East African rainfall seasonal cycle is investigated based on modulated annual cycle (MAC). Ensemble empirical mode decomposition (EEMD) is used to extract MAC from monthly data for the period 1900 to 2008. The MAC is given by year-to-year changes in annual and semi-annual components. Results show that MAC account for between 45 to 80% proportion of rainfall variability. Spatial structure of MAC shows that it captures the north-south (equatorial) pattern for annual (semi-annual) mode with explained variance of 54% (22%). The spatial structure of MAC further reveals that the seasonality of rainfall over the whole region does not follow the north/south classical scheme where the semi-annual component dominates the equatorial while the annual component dominates areas relatively far from the equator. MAC amplitude tends to be high during anomalous rainfall indicating that the impact of major climate processes that produce seasonal cycle are amplified or suppressed by interannual to longer timescale climate variability modes. This study has shown variability in the seasonal cycle of East African rainfall on interannual-to-longer time scales, which should be considered in studies on variability of rainfall and in seasonal-to-longer time scale prediction of rainfall over the region.

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Trends and Periodicities in East African Rainfall Data

Cited by 103 publications

References 0 publications

Analysis of mid-twentieth century rainfall trends and variability over southwestern Uganda

Analysis of mid-twentieth century rainfall trends and variability over southwestern Uganda

Extreme Rainfall Events and Lake Level Changes in East Africa: Recent Events and Historical Precedents

East African rainfall seasonality based on modulated annual cycle (MAC)

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