Local climate change signals and changes in climate extremes in a typical Sahel catchment: The case of Dano catchment, Burkina Faso

Okafor, Gloria C.; Larbi, Isaac; Chukwuma, E. C.; Nyamekye, Clement; Limantol, Andrew Manoba; Dotse, Sam-Quarcoo

doi:10.1016/j.envc.2021.100285

Cited by 14 publications

(8 citation statements)

References 32 publications

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“…The coefficient of determination (R²), as a validation criterion, helped to understand the relationship between two datasets to identify the most qualified time series to fill the gaps. To evaluate the reconstruction accuracy, the modified time series were compared to agro-climatological datasets of the NASA POWER project (https://power.larc.nasa.gov/; accessed on 7 May 2023) and existing literature [3,40,51].…”

Section: Discussionmentioning

confidence: 99%

“…The increasing frequency of droughts, irregularities in onset and shortening of the rainy period combined with a high reliance on rain-fed agriculture and weak institutional power, or limited adaptive capacity, make many regions less favorable for crop production [1,2]. A study by [3] projected under two representative concentration pathways (RCP 4.5 and RCP 8.5) for the Dano catchment in West Africa showed a decreasing annual rainfall rate of 25% with a temperature increase of about 1.3 • C to 1.5 • C by 2049. To mitigate these impacts, the 2014 Malabo declaration, as the main instrument of the Comprehensive Africa Agriculture Development Programme, aims to allocate 10% of African public resources to enhance agricultural productivity [4].…”

Section: Introductionmentioning

confidence: 99%

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Agricultural Yield Responses to Climate Variabilities in West Africa: A Food Supply and Demand Analysis

Schultze,

Kankam,

Sanfo

et al. 2024

Land

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Agricultural productivity is expected to decrease under changing climate conditions that correspond to the stability of West African food systems. Although numerous studies have evaluated impacts of climate variability on crop yields, many uncertainties are still associated with climate extremes as well as the rapid population growth and corresponding dietary lifestyle. Here, we present a food supply and demand analysis based on the relationship between climate change, crop production, and population growth in three sites from southwestern Burkina Faso to southwestern Ghana. Climate and agricultural time series were analyzed by using boxplots mixed with a Mann–Kendall trend test and Sen’s slope. Food balance sheets were calculated by estimating the demand using a population growth model linked to food supply with local consumption patterns. We found almost insignificant rainfall and temperature trends for both sites in the Sudano-Guinean savannah. Conversely, the climate regime of southwestern Ghana revealed a strong significant increasing temperature over time. Crop yield trends demonstrated that maize and sorghum were significantly enhanced in both study areas of the Sudano-Guinean savannah. Southwestern Ghana depicted a different crop pattern where cassava and plantain showed a strong upward yield trend. The grouped food balance sheets across the regions illustrated a surplus for the Sudano-Guinean savannah while southwestern Ghana exhibited a deficit. Despite the growing yield of various crops, food demand is outpacing regional production.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Agricultural Yield Responses to Climate Variabilities in West Africa: A Food Supply and Demand Analysis

Schultze,

Kankam,

Sanfo

et al. 2024

Land

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“…The rise time corresponding to the time between the beginning of the runoff and the maximum of the flood was determined using the following formula (Equation 13): (13) Where Tm 10 is the rise time and Tb 10 is the base time.…”

Section: Methodsmentioning

confidence: 99%

“…In West Africa, a change in climatic conditions since the 1970s has resulted in a decrease in average annual rainfall and an increase in temperature [12]. Okafor et al [13] realized research to study climate change and Spatio-temporal variations in extreme climate indices of the Dano watershed in Burkina Faso using historical data for the period 1981-2010 and projections for the period 2020-2049. According to the results of their study, the climate change signal in the future based on the ensemble mean of the regional climate models a decrease in the mean annual rainfall by 25.2% and 25.6% for Representative Concentration Pathways 4.5 and Representative Concentration Pathways 8.5 respectively.…”

Section: Introductionmentioning

confidence: 99%

Hydrological Investigation and Characterization of Sokouraba Watershed, Burkina Faso

Harouna

Daou²,

Hassan³

et al. 2022

CJAST

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The purpose of this study is to determine the hydrological characteristics and the morphometric parameters of the Sokouraba watershed (BV) where the climatic hazards make the water resource increasingly insufficient. This watershed has never been the subject of morphometric and hydrological characterization in the past. The present study made it possible thus, to better understand the functioning of the hydrographic networks as well as the quantity of water likely to be used for the construction of a dam in this watershed. According to the hydrologic analysis results, from 1960 to 2019, the annual precipitation values range from 347,3 to 1596,6 mm with an average of 1099,28 mm. The maximum daily rainfall values for the same period vary between 42 and 287 mm with an average of 82.85 mm. The values of wet decennial and wet quinquennial rainfall are respectively 1380 and 1280 mm. The dry five-year and dry ten-year rainfall values are 917 mm and 821 mm respectively. According to the watershed characterization results, the calculated Sokouraba watershed surface is 77,34 Km² and its perimeter is 44,3 Km. The values of the length and the width of the equivalent rectangle of the basin are respectively 17,81 Km and 4,34 Km. The longitudinal slope and the overall slope index values are 3.24 m/km and 3.20 m/Km respectively. The value of the corrected overall slope index of the watershed is 7.05 m/Km while the Gravelius compactness index is 1.42. This value of KG higher than 1 indicates that the watershed of sokouraba is of elongated shape. The specific gradient value of the watershed is 61.99. This value is included between 50 and 100 m, thus according to the classification of the reliefs the latter, the relief of the catchment area of Sokouraba can be qualified as moderate. The values of the length of the main watercourse and the total length of the watercourses calculated are respectively 15,41Km and 63,25 Km. The calculated value of the drainage density of the catchment area is 0.21 Km-1. The value of the attenuation coefficient and the ten-year rainfall calculated in this study are 0,78 and 100,062 mm respectively. The value of the decennial runoff coefficient thus calculated is 27,83%.

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“…However, this is still lacking in Ghana, especially Greater Accra. Existing literature has assessed future CC in terms of temperature and precipitation in West Africa using multiple climate models such as regional and global climate models (Awotwi et al, 2021;Okafor et al, 2019Okafor et al, , 2021Siabi et al, 2021;Yeboah et al, 2022). The new generation of global climate models (GCMs) developed for the CMIP6 are released by the IPCC (AR6) and are now available (Wang et al, 2018).…”

Section: The Coupled Model Intercomparison Project Phase 6 (Cmip 6)mentioning

confidence: 99%

Assessment of Shared Socioeconomic Pathway (Ssp) Climate Scenarios and its Impacts on the Greater Accra Region

Siabi

Awafo²,

Kabo-bah

et al. 2022

SSRN Journal

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Local climate change signals and changes in climate extremes in a typical Sahel catchment: The case of Dano catchment, Burkina Faso

Cited by 14 publications

References 32 publications

Agricultural Yield Responses to Climate Variabilities in West Africa: A Food Supply and Demand Analysis

Agricultural Yield Responses to Climate Variabilities in West Africa: A Food Supply and Demand Analysis

Hydrological Investigation and Characterization of Sokouraba Watershed, Burkina Faso

Assessment of Shared Socioeconomic Pathway (Ssp) Climate Scenarios and its Impacts on the Greater Accra Region

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