Recent climate trends for the Volta Basin in West Africa

Darko, Deborah; Adjei, Kwaku Amaning; Odai, Samuel Nii; Obuobie, Emmanuel; Asmah, Ruby; Trolle, Dennis

doi:10.1002/wea.3303

Cited by 6 publications

(5 citation statements)

References 20 publications

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“…This confirms the results found earlier. The same observations were made by [86], who analyzed the climatic tendency in the Volta watershed during the period 1981-2010. These authors indeed observed a positive tendency in the precipitation of the Sahelian zone of the western part of Africa, which would indicate the establishment of a wet period.…”

Section: Long-term Tendencies Of Precipitationsupporting

confidence: 60%

Long-Term Evolution of Rainfall and Its Consequences on Water Resources: Application to the Watershed of the Kara River (Northern Togo)

Ani

Jaunat

Marin

et al. 2022

Water

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The Kara River watershed (KRW), northern Togo, is facing climate-change impacts that have never been clearly characterized. Six decades of rainfall data (1961–2020) from six measuring stations ideally distributed across the watershed were used in this study. The flow records from two stations situated in contrasting locations on the KRW were also used. Statistical tests were conducted to assess the spatial and temporal variability of the rainfall and to detect tendencies within these meteorological series. The water balance method and calculation of the dry-off coefficient and of the groundwater volume drained by rivers allowed evaluating the impact of climatic evolution on surface flow and on groundwater volumes during the six decades studied. The results showed contrasting spatiotemporal variability of rainfall (and of aquifer recharge) over the watershed with a decreasing tendency upstream and an increasing one downstream. At the same time, the water volume drained by the aquifer to sustain the river’s base flow decreased from −22% to −36% depending on the measuring station. These results constitute a decision-making tool for Togolese water resource managers and are of primary importance for characterizing the fate of water resources worldwide in regions subject to severe droughts.

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Section: Long-term Tendencies Of Precipitationsupporting

confidence: 60%

Long-Term Evolution of Rainfall and Its Consequences on Water Resources: Application to the Watershed of the Kara River (Northern Togo)

Ani

Jaunat

Marin

et al. 2022

Water

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“…Observing continuous dryness in the dry season and continuous wetness in the wet season suggests that residents may lack water during the dry period, water will be available in the wet season. The dry season is a period of prolong drought (lasting about seven months), which affects residents livelihood activities such as domestic chores, farm and animal husbandry as is also reported in the works of Kabo-Bah et al (2016), Darko et al (2018) and Incoom et al (2020).…”

Section: Discussionmentioning

confidence: 99%

Seasonal Differences in Rainfall Distribution Within the Bawku Area in the Savanna Belt of Ghana

Ansah-Mensah,

Asamoah

2023

Ghana J. Geography

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Empirical evidence suggests that temperatures are continuously rising in the savannah areas of Ghana and impacting negatively on residents’ livelihood activities. However, there is paucity of information on the wet and dry seasons’ rate of wetness or dryness in the driest belt of Ghana. Meanwhile, residents of the area are mainly rained agriculturalists. We employed gauge station rainfall and temperature data from Ghana Meteorological Agency to assess the seasonal rainfall characteristics of the Bawku area using XLSTAT and DrinC software. Results from the rainfall anomalies show persistent dryness (-0.017) in the area during the dry season and continuous wetness in the wet season (0.021). Evapotranspiration was consistently higher in the dry season at a rate of 2.6% (0.26) yearly as well as a high rate of aridity [AI] (0.00≤AI≤0.09) in the dry season and low aridity (0.56 ≤AI ≤1.13) during the wet season. Following the reduction in the amount of rainfall, we can conclude that Bawku area is continuously drying amidst the changing climate. It is recommended that the ministry of agriculture should prioritise the construction of mechanised dams or wells and expand irrigation projects in the area to reduce the climate change effects on the livelihood of the residents especially in the dry season.

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“…The Guinea Savanna is the largest agro‐ecological zone in Ghana, stretching from Oti and Bono Regions in the South to Upper East and Upper West Regions in the north (Incoom et al., 2020). The area records a monomodal rainfall with a mean annual rainfall of 1034 mm and a mean monthly temperature ranging from 27 to 35°C (Darko et al., 2019; Ghansah et al., 2018). The Guinea savanna records a mean monthly minimum and maximum relative humidity of 53% and 80%, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…The vegetation is predominantly grassland interspersed with trees and shrubs (Darko et al., 2019). The most frequently recorded herbaceous plants and grasses include Boerhavia diffusa , Andropogon pseudapricus , Tridax procumbens and Panicum maximu (Ziblim et al., 2015).…”

Section: Methodsmentioning

confidence: 99%

Beekeeping improves shea pollination and fruit set in West African agroforestry parklands

Nasare,

Stout,

Kwapong

2024

Ecol Sol and Evidence

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Shea (Vitellaria paradoxa C.F. Gaertn) is a fruit tree of domestic and industrial importance in arid and semi‐arid regions of Sub‐Saharan Africa. Fruit set is largely dependent on insect pollination but recent studies have revealed a pollen deficit. The introduction of managed bees into orchards is an effective approach for enhanced pollination services in temperate climates. However, there is limited information to guide the adoption of this practice in agroforestry parklands. This study investigated the effect of managed honey bee colonies (Apis mellifera) on fruit yield of shea in six parklands across three regions of Ghana. Tree proximity to the apiary had a detectable effect on fruit set within a 500 m range of the apiary. Proximity of shea trees to apiary was significantly related to number of immature fruit set but not number of mature fruits. Fruit weight and size were not significantly related to distance from apiary or pollination treatment. This implies that the introduction of beekeeping has the potential to address shea pollination deficit at least within a 500 m range of the apiary. Further studies are needed to determine the optimal hive density per acreage of shea parkland to maximise pollination services.

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Recent climate trends for the Volta Basin in West Africa

Cited by 6 publications

References 20 publications

Long-Term Evolution of Rainfall and Its Consequences on Water Resources: Application to the Watershed of the Kara River (Northern Togo)

Long-Term Evolution of Rainfall and Its Consequences on Water Resources: Application to the Watershed of the Kara River (Northern Togo)

Seasonal Differences in Rainfall Distribution Within the Bawku Area in the Savanna Belt of Ghana

Beekeeping improves shea pollination and fruit set in West African agroforestry parklands

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