Rainfall Variability under Present and Future Climate Scenarios Using the Rossby Center Bias-Corrected Regional Climate Model

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dc.contributor.author Mugo, Jane W.
dc.contributor.author Opijah, Franklin J.
dc.contributor.author Ngaina, Joshua
dc.contributor.author Karanja, Faith
dc.contributor.author Mburu, Mary W.
dc.date.accessioned 2020-12-10T11:49:27Z
dc.date.available 2020-12-10T11:49:27Z
dc.date.issued 2020-09-08
dc.identifier.citation American Journal of Climate Change Vol.09 No.03 (2020) en_US
dc.identifier.issn 2167-9509
dc.identifier.uri https://www.scirp.org/pdf/ajcc_2020090713302824.pdf
dc.identifier.uri http://repository.seku.ac.ke/handle/123456789/6160
dc.description Doi:10.4236/ajcc.2020.93016 en_US
dc.description.abstract This study sought to determine the spatial and temporal variability of rainfall under past and future climate scenarios. The data used comprised station-based monthly gridded rainfall data sourced from the Climate Research Unit (CRU) and monthly model outputs from the Fourth Edition of the Rossby Centre (RCA4) Regional Climate Model (RCM), which has scaled-down nine GCMs for Africa. Although the 9 Global Climate Models (GCMs) downscaled by the RCA4 model was not very good at simulating rainfall in Kenya, the ensemble of the 9 models performed better and could be used for further studies. The ensemble of the models was thus bias-corrected using the scaling method to reduce the error; lower values of bias and Normalized Root Mean Square Error (NRMSE) were recorded when compared to the uncorrected models. The bias-corrected ensemble was used to study the spatial and temporal behaviour of rainfall under baseline (1971 to 2000) and future RCP 4.5 and 8.5 scenarios (2021 to 2050). An insignificant trend was noted under the baseline condition during the March-May (MAM) and October-December (OND) rainfall seasons. A positive significant trend at 5% level was noted under RCP 4.5 and 8.5 scenarios in some stations during both MAM and OND seasons. The increase in rainfall was attributed to global warming due to increased anthropogenic emissions of greenhouse gases. Results on the spatial variability of rainfall indicate the spatial extent of rainfall will increase under both RCP 4.5 and RCP 8.5 scenario when compared to the baseline; the increase is higher under the RCP 8.5 scenario. Overall rainfall was found to be highly variable in space and time, there is a need to invest in the early dissemination of weather forecasts to help farmers adequately prepare in case of unfavorable weather. Concerning the expected increase in rainfall in the future, policymakers need to consider the results of this study while preparing mitigation strategies against the effects of changing rainfall patterns. en_US
dc.language.iso en en_US
dc.publisher Scientific Research Publishing en_US
dc.subject CORDEX en_US
dc.subject Climate Change en_US
dc.subject Bias Correction en_US
dc.subject Ensemble en_US
dc.subject Rainfall en_US
dc.subject Kenya en_US
dc.subject RCA4 en_US
dc.title Rainfall Variability under Present and Future Climate Scenarios Using the Rossby Center Bias-Corrected Regional Climate Model en_US
dc.type Article en_US

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