Journal
THEORETICAL AND APPLIED CLIMATOLOGY
Volume 137, Issue 1-2, Pages 1117-1134Publisher
SPRINGER WIEN
DOI: 10.1007/s00704-018-2643-x
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Funding
- Natural Environment Research Council/Department for International Development (NERC/DFID) via the Future Climate for Africa (FCFA) [NE/M02038X/1]
- NERC [NE/M02038X/1] Funding Source: UKRI
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The study evaluates the ability of ten regional climate models (RCMs) to simulate the present-day rainfall over Uganda within the Coordinated Regional Downscaling Experiment (CORDEX) for the period 1990-2008. The models' ability to reproduce the space-time variability of annual, seasonal, and interannual rainfall has been diagnosed. A series of metrics have been employed to quantify the RCM-simulated rainfall pattern discrepancies and biases compared to three gridded observational datasets. It is found that most models underestimate the annual rainfall over the country; however, the seasonality of rainfall is properly reproduced by the RCMs with a bimodal component over the major part of the country and a unimodal component over the north. Models reproduce the interannual variability of the dry season (December-February) but fail with the long and short rains seasons even if the ENSO and IOD signal is correctly simulated by most models. In many aspects, the UQAM-CRCM5 RCM is found to perform best over the region. Overall, the ensemble mean of the ten RCMs reproduces the rainfall climatology over Uganda with reasonable skill.
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