Changes in length of rainy season and rainfall extremes under moderate greenhouse gas emission scenario in the Vea catchment, Ghana

The economic implications of extreme climate changes are found to impact sub-Saharan Africa negatively. This study aimed to analyze projected changes in length of rainy season (LRS), and rainfall extreme indices at the Vea catchment, Ghana. The analysis was performed using high-resolution simulated...

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Autores principales:	Isaac Larbi, Bessah Enoch, Clement Nyamekye, Joshua Amuzu, Gloria C. Okafor, Daniel Kwawuvi, Yaw Mensah Asare
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	length of rainy season rainfall extreme indices rainfall projections regional climate model vea catchment Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/2a61dc48e66646c581cc11ecb4a0e541
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spelling	oai:doaj.org-article:2a61dc48e66646c581cc11ecb4a0e5412021-11-05T19:07:48ZChanges in length of rainy season and rainfall extremes under moderate greenhouse gas emission scenario in the Vea catchment, Ghana2040-22442408-935410.2166/wcc.2021.316https://doaj.org/article/2a61dc48e66646c581cc11ecb4a0e5412021-09-01T00:00:00Zhttp://jwcc.iwaponline.com/content/12/6/2594https://doaj.org/toc/2040-2244https://doaj.org/toc/2408-9354The economic implications of extreme climate changes are found to impact sub-Saharan Africa negatively. This study aimed to analyze projected changes in length of rainy season (LRS), and rainfall extreme indices at the Vea catchment, Ghana. The analysis was performed using high-resolution simulated rainfall data from the Weather Research and Forecasting (WRF) model under moderate greenhouse gas emission scenario for the period 2020–2049 relative to the 1981–2010 period. LRS was computed from the difference between rainfall onset and cessation dates, and its trends were assessed using Mann–Kendall test and Sen's slope estimator. Annual rainfall intensity and frequency indices were computed. Results showed an increase in mean LRS from 168 to 177 days, which was at a rate of 1 day/year in the future (2020–2049). The LRS increase would be more significant at northern and south-western parts of the catchment. Rainfall intensity and frequency indices are projected to increase at spatial scale across the catchment. Projected changes in rainfall extremes could increase the frequency and intensity of drought and flood events. Thus, it is necessary to integrate suitable climate change adaptation measures such as rainwater harvesting, flood control measures, and development of early warning systems in the planning process by decision-makers at the catchment. HIGHLIGHTS The spatio-temporal changes in length of rainy season and rainfall extreme indices were analyzed under moderate greenhouse gas emission scenario for the vea catchment.; High resolution regional climate model was employed in this study.; Rainfall intensity and frequency indices are projected to increase at the spatial scale across the catchment.; Mann–Kendall test, onset and cessation of rainfall were used for the data analsysis.;Isaac LarbiBessah EnochClement NyamekyeJoshua AmuzuGloria C. OkaforDaniel KwawuviYaw Mensah AsareIWA Publishingarticlelength of rainy seasonrainfall extreme indicesrainfall projectionsregional climate modelvea catchmentEnvironmental technology. Sanitary engineeringTD1-1066Environmental sciencesGE1-350ENJournal of Water and Climate Change, Vol 12, Iss 6, Pp 2594-2607 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	length of rainy season rainfall extreme indices rainfall projections regional climate model vea catchment Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350
spellingShingle	length of rainy season rainfall extreme indices rainfall projections regional climate model vea catchment Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Isaac Larbi Bessah Enoch Clement Nyamekye Joshua Amuzu Gloria C. Okafor Daniel Kwawuvi Yaw Mensah Asare Changes in length of rainy season and rainfall extremes under moderate greenhouse gas emission scenario in the Vea catchment, Ghana
description	The economic implications of extreme climate changes are found to impact sub-Saharan Africa negatively. This study aimed to analyze projected changes in length of rainy season (LRS), and rainfall extreme indices at the Vea catchment, Ghana. The analysis was performed using high-resolution simulated rainfall data from the Weather Research and Forecasting (WRF) model under moderate greenhouse gas emission scenario for the period 2020–2049 relative to the 1981–2010 period. LRS was computed from the difference between rainfall onset and cessation dates, and its trends were assessed using Mann–Kendall test and Sen's slope estimator. Annual rainfall intensity and frequency indices were computed. Results showed an increase in mean LRS from 168 to 177 days, which was at a rate of 1 day/year in the future (2020–2049). The LRS increase would be more significant at northern and south-western parts of the catchment. Rainfall intensity and frequency indices are projected to increase at spatial scale across the catchment. Projected changes in rainfall extremes could increase the frequency and intensity of drought and flood events. Thus, it is necessary to integrate suitable climate change adaptation measures such as rainwater harvesting, flood control measures, and development of early warning systems in the planning process by decision-makers at the catchment. HIGHLIGHTS The spatio-temporal changes in length of rainy season and rainfall extreme indices were analyzed under moderate greenhouse gas emission scenario for the vea catchment.; High resolution regional climate model was employed in this study.; Rainfall intensity and frequency indices are projected to increase at the spatial scale across the catchment.; Mann–Kendall test, onset and cessation of rainfall were used for the data analsysis.;
format	article
author	Isaac Larbi Bessah Enoch Clement Nyamekye Joshua Amuzu Gloria C. Okafor Daniel Kwawuvi Yaw Mensah Asare
author_facet	Isaac Larbi Bessah Enoch Clement Nyamekye Joshua Amuzu Gloria C. Okafor Daniel Kwawuvi Yaw Mensah Asare
author_sort	Isaac Larbi
title	Changes in length of rainy season and rainfall extremes under moderate greenhouse gas emission scenario in the Vea catchment, Ghana
title_short	Changes in length of rainy season and rainfall extremes under moderate greenhouse gas emission scenario in the Vea catchment, Ghana
title_full	Changes in length of rainy season and rainfall extremes under moderate greenhouse gas emission scenario in the Vea catchment, Ghana
title_fullStr	Changes in length of rainy season and rainfall extremes under moderate greenhouse gas emission scenario in the Vea catchment, Ghana
title_full_unstemmed	Changes in length of rainy season and rainfall extremes under moderate greenhouse gas emission scenario in the Vea catchment, Ghana
title_sort	changes in length of rainy season and rainfall extremes under moderate greenhouse gas emission scenario in the vea catchment, ghana
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/2a61dc48e66646c581cc11ecb4a0e541
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Changes in length of rainy season and rainfall extremes under moderate greenhouse gas emission scenario in the Vea catchment, Ghana

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