Title: Potential Impact of 1.5oC and 2oC global warming on consecutive dry and wet days over West Africa
Authors: KLUTSE NANA AMA BROWNEAJAYI VGBOBANIYI EEGBEBIYI TKOUADIO KNKRUMAH FQUAGRAINE KOLUSEGUN CDIASSO UABIODUN BLAWAL KNIKULIN GRIGORYLENNARD CHRISTOPHERDOSIO ALESSANDRO
Citation: ENVIRONMENTAL RESEARCH LETTERS vol. 13 no. 5 p. 055013
Publisher: IOP PUBLISHING LTD
Publication Year: 2018
JRC N°: JRC110425
ISSN: 1748-9326
URI: http://iopscience.iop.org/article/10.1088/1748-9326/aab37b/meta
http://publications.jrc.ec.europa.eu/repository/handle/JRC110425
DOI: 10.1088/1748-9326/aab37b
Type: Articles in periodicals and books
Abstract: We examine the impact of +1.5 ◦C and +2 ◦C global warming levels above pre-industrial levels on consecutive dry days (CDD) and consecutive wet days (CWD), two key indicators for extreme precipitation and seasonal drought. This is done using climate projections from a multi-model ensemble of 25 regional climate model (RCM) simulations. The RCMs take boundary conditions from ten global climate models (GCMs) under the RCP8.5 scenario.We define CDD as the maximum number of consecutive days with rainfall amount less than 1mm and CWD as the maximum number of consecutive days with rainfall amount more than 1 mm. The differences in model representations of the change in CDD and CWD, at 1.5 ◦C and 2◦C global warming, and based on the control period 1971−2000 are reported. The models agree on a noticeable response to both 1.5 ◦C and 2◦C warming for each index. Enhanced warming results in a reduction in mean rainfall across the region.More than 80% of ensemble members agree that CDD will increase over the Guinea Coast, in tandem with a projected decrease in CWD at both 1.5 ◦C and 2◦C global warming levels. These projected changes may influence already fragile ecosystems and agriculture in the region, both of which are strongly affected by mean rainfall and the length of wet and dry periods.
JRC Directorate:Space, Security and Migration

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