Potential Impacts of Land Cover Change on the Interannual Variability of Rainfall and Surface Temperature over West Africa

Diba, Ibrahima; Camara, Moctar; Sarr, Alioune Badara; Diedhiou, Arona

doi:10.3390/atmos9100376

Cited by 11 publications

(17 citation statements)

References 71 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Land use and land cover changes are known to influence the climate system [3]. Afforestation option is predicted to increase the rainfall over West Africa [51] while deforestation will reduce it [52]. Some study have shown how the change in vegetation affect the rainfall in the region [8,51].…”

Section: Discussionmentioning

confidence: 99%

Climate, Land Use and Land Cover Changes in the Bandama Basin (Côte D’Ivoire, West Africa) and Incidences on Hydropower Production of the Kossou Dam

Kouame

Obahoundje

Diedhiou

et al. 2019

Land

Self Cite

View full text Add to dashboard Cite

Climate and land use/cover changes are potential drivers of change in hydrology and water use. Incidences of these factors on Bandama hydrological basin and Kossou hydropower generation (1981–2016) in West Africa are assessed in this present work. Using Landsat products of United Stated Geological Survey, results show that water bodies areas and land use have increased by 1.89%/year and 11.56%/year respectively, whereas herbaceous savanna, savanna, forest and evergreen forest coverage have been reduced by 1.39%/year, 0.02%/year, 2.39%/year and 3.33%/year respectively from 1988 to 2016. Hydroclimatic analysis reveals that streamflow presents greater change in magnitude compared to rainfall though both increasing trends are not statistically significant at annual scale. Streamflow varies at least four (two) times greatly than the rainfall (monthly and seasonally) annually except during driest months probably due to land use/cover change. In contrast, Kossou hydropower generation is significantly decreasing (p-value 0.007) at both monthly and annual scales possibly due to water abstraction at upstream. Further works are required to elucidate the combined effects of land use/cover and climate changes on hydrological system as well as water abstraction on Kossou generation.

show abstract

Section: Discussionmentioning

confidence: 99%

Climate, Land Use and Land Cover Changes in the Bandama Basin (Côte D’Ivoire, West Africa) and Incidences on Hydropower Production of the Kossou Dam

Kouame

Obahoundje

Diedhiou

et al. 2019

Land

Self Cite

View full text Add to dashboard Cite

show abstract

“…The method of [45] is used to calculate the rainfall and temperature normalized anomalies over the West African domain (20 • W-20 • E; 5 • N-17.5 • N). This latter method is presented in details in [23]. Table 1.…”

Section: Methodsmentioning

confidence: 99%

“…The model description and the experimental setup are extensively described in [23]. Briefly, we used the default version of the International Center for Theoretical Physics (ICTP-Italy-Trieste) regional climate model RegCM4.5 as described in [24].…”

Section: Model Description and Experimental Set Upmentioning

confidence: 99%

“…Large scale precipitation processes have been solved using the subgrid explicit moisture scheme (SUBEX) of [29]. Convection schemes used are those of [30] with the closure of [31] for the main land and [32] for the ocean as in [23]. Horizontal and vertical resolutions are respectively 50 km and 18 vertical levels.…”

Section: Model Description and Experimental Set Upmentioning

confidence: 99%

See 1 more Smart Citation

Investigating West African Monsoon Features in Warm Years Using the Regional Climate Model RegCM4

2019

Self Cite

View full text Add to dashboard Cite

This study investigates the changes in West African monsoon features during warm years using the Regional Climate Model version 4.5 (RegCM4.5). The analysis uses 30 years of datasets of rainfall, surface temperature and wind parameters (from 1980 to 2009). We performed a simulation at a spatial resolution of 50 km with the RegCM4.5 model driven by ERA-Interim reanalysis. The rainfall amount is weaker over the Sahel (western and central) and the Guinea region for the warmest years compared to the coldest ones. The analysis of heat fluxes show that the sensible (latent) heat flux is stronger (weaker) during the warmest (coldest) years. When considering the rainfall events, there is a decrease of the number of rainy days over the Guinea Coast (in the South of Cote d’Ivoire, of Ghana and of Benin) and the western and eastern Sahel during warm years. The maximum length of consecutive wet days decreases over the western and eastern Sahel, while the consecutive dry days increase mainly over the Sahel band during the warm years. The percentage of very warm days and warm nights increase mainly over the Sahel domain and the Guinea region. The model also simulates an increase of the warm spell duration index in the whole Sahel domain and over the Guinea Coast in warm years. The analysis of the wind dynamic exhibits during warm years a weakening of the monsoon flow in the lower levels, a strengthening in the magnitude of the African Easterly Jet (AEJ) in the mid-troposphere and a slight increase of the Tropical Easterly Jet (TEJ) in the upper levels of the atmosphere during warm years.

show abstract

“…Since then, the study of the variability of climatic parameters is one of the major concerns of the scientific community [3][4][5]. That is why it is noted that the findings of researches are useful tools to assist decision-makers in the context of climate change [6].…”

Section: Introductionmentioning

confidence: 99%

Surface Temperature Trend Estimation over 12 Sites in Guinea Using 57 Years of Ground-Based Data

Loua

Benchérif

Bègue

et al. 2020

Climate

View full text Add to dashboard Cite

Trend-Run model was performed to estimate the trend in surface temperatures recorded at 12 sites in Guinea from 1960 to 2016 and to examine the contribution of each climate forcing. The coefficient of determination (R 2 ) calculated varies between 0.60 and 0.90, it provides total information about the simulation capability of the model. The decadal trend values also calculated show an upward trend (between 0.04 °C ± 0.06 °C decade −1 and 0.21 °C ± 0.06 °C decade −1 ). In addition, forcings' contributions were quantified, and the annual oscillation (AO) contribution is higher for most of the stations, followed by semiannual oscillation (SAO). Among the forcings, the tropical Northern Atlantic (TNA) contribution is greater than that of the sunspot number (SSN), Niño3.4 and Atlantic Niño (AN). Moreover, the Mann-Kendall test revealed a positive significant trend for all stations except at the Macenta site. Additionally, with sequential Mann-Kendall test, trend turning points were found only for the stations of Mamou, Koundara and Macenta at different dates. The temperature anomalies depict warming episodes (1970s, 1980s, 1984 and 1990s). Since then, the temperature is consistently increasing over the country. A significant warming has been shown, which might be further investigated using these models with additional contributing factors.

show abstract

Potential Impacts of Land Cover Change on the Interannual Variability of Rainfall and Surface Temperature over West Africa

Cited by 11 publications

References 71 publications

Climate, Land Use and Land Cover Changes in the Bandama Basin (Côte D’Ivoire, West Africa) and Incidences on Hydropower Production of the Kossou Dam

Climate, Land Use and Land Cover Changes in the Bandama Basin (Côte D’Ivoire, West Africa) and Incidences on Hydropower Production of the Kossou Dam

Investigating West African Monsoon Features in Warm Years Using the Regional Climate Model RegCM4

Surface Temperature Trend Estimation over 12 Sites in Guinea Using 57 Years of Ground-Based Data

Contact Info

Product

Resources

About