Modeling the impact of changes in Atlantic sea surface temperature on the climate of West Africa

Adeniyi, M. O.

doi:10.1007/s00703-016-0473-x

Cited by 9 publications

(5 citation statements)

References 50 publications

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“…It is clear that the performance of the RegCM4 appears in line with previous work on West Africa using either the RegCM4 with different configurations (Sylla et al 2015;Saini et al 2015;Adeniyi 2017;Diallo et al 2016;Kebe et al 2016;N'Datchoh et al 2018) or other regional climate models (Diallo et al 2012Sylla et al 2013;Hagos et al 2014;Gbobaniyi et al 2014;Druyan and Fulakeza 2016;Klutse et al 2016). In addition, the RegCM4 simulates accurately the magnitudes/locations of the main WAM circulation features associated with the summer precipitation (not shown).…”

Section: Model Evaluationsupporting

confidence: 73%

“…These changes are the results of a combination of both natural and anthropogenic forcings. Several studies have attempted to explain the Sahelian severe droughts using variety of approaches: (i) variability of sea surface temperature (SST; Folland et al 1986;Giannini et al 2003;Paeth and Hense 2004;Pomposi et al 2016;Adeniyi 2017); (ii) land surfaceatmosphere interactions (Charney et al 1977;Wang and Eltahir 2000;Koster et al 2004;Xue et al 2016;Wang et al 2016); and (iii) large-scale atmospheric teleconnections related to the El Niño or North Atlantic Oscillation (NAO) (Bader and Latif 2003;Joly and Voldoire 2009). The West African climate is dominated by the West African monsoon (WAM) system, and monsoon variability explains most of the total annual precipitation fluctuations.…”

Section: Introductionmentioning

confidence: 99%

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Effect of the African greenbelt position on West African summer climate: a regional climate modeling study

Bamba

Diallo

N’Datchoh

et al. 2018

Theor Appl Climatol

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This modeling study is conducted to examine the potential impact of the reforestation (greenbelt) location (either in Sahel or in Guinean region) on West African summer climate system. To this end, three simulations using the regional climate model RegCM4 driven by ERA-Interim reanalysis were performed at 50 km horizontal resolution over a West African domain for the period 2000-2011. The first experiment, namely the control (CTRL), uses the standard vegetation cover, while the two others incorporate throughout the model integration, a zonal reforestation band of evergreen broadleaf over different locations: (i) over a 13°N-17°N band latitudes in a Sahel-Sahara region (experiment hereafter referred to as GB15N) and (ii) between 8. 5°N-11.5°N in the Guinea Coast region (experiment hereafter referred to as GB10N). A comparison of the CTRL experiment with observation reveals a faithful reproduction of the mean boreal and summer seasonal precipitation pattern, though substantial dry/wet biases remain, especially in the Atlantic Ocean. In addition, the seasonal cycle over sub-regions matches satisfactory the observed pattern. The GB15N reforestation leads to a precipitation increase in the range of 2-4 mm/day over the forested areas, whereas in the GB10N reforestation, precipitation increase is weaker and not necessarily located in the forested areas. Temperature cooling is observed over the reforested area and may be explained by a decrease of ground heat flux related to a reduction of the surface albedo.

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Section: Model Evaluationsupporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Effect of the African greenbelt position on West African summer climate: a regional climate modeling study

Bamba

Diallo

N’Datchoh

et al. 2018

Theor Appl Climatol

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“…The schemes used for radiation, lateral boundary condition, boundary layer, explicit moisture, ocean flux, and pressure gradient flux in this study are in line with Adeniyi (2017). Adeniyi (2019b) reported good performance of cumulus parameterization schemes by Tiedtke (Tiedtke 1996) and Kain-Fritch (Kain, Fritsch 1990) over West Africa.…”

Section: Model Set-upsupporting

confidence: 78%

Simulating the Influence of doubled CO2 on the water budget over West Africa using RegCM4.7

Adeniyi¹

2020

Meteorol. Hydrol. Water Manage.

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This paper simulates the responses of water budget components to doubled CO2 (2 × 378 ppm) concentration in the atmosphere with atmospheric and oceanic surface warming of 2°C. Simulations employed version 4.7 of the Regional Climate Model of the International Centre for Theoretical Physics (ICTP). Two six-year experiments were each repeated twice with the same model physics and parameterizations. The control experiment held the CO2 concentration at 378 ppm (no warming), while the other experiment specified doubled CO2 concentration and warming. The results showed a positive response (60-100% increase) to doubled CO2 for precipitation, runoff, and storage terms in Sierra Leone, Burkina Faso, Guinea Bissau, and the ocean area between 3 and 13°N. However, there was a negative response (up to 60%) for northern Senegal, southern Mali, and northern Nigeria. The reductions in water fluxes were observed mostly on the leeward side of the highlands. Evapotranspiration showed a negative response (1-20%) to doubled CO2 on the land north of 20°N. Burkina Faso and southern Mali responded oppositely to doubled CO2, despite their spatial proximity.

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“…The Lake Coupling described in [39] with modification after [40] were adopted. Detailed descriptions of the configuration, initial and lateral boundary conditions as well as various improved schemes adopted in the CORDEX models have been well documented in the literature [34][35][36][37][38][39][40]. The future climate projections were carried out for two emission scenarios: RCP 2.6 and RCP8.5 of low and high range mitigation scenarios, respectively [41].…”

Section: Model Description and Simulationsmentioning

confidence: 99%

Examination of potential impacts of future climate change on solar radiation in Togo, West Africa

et al. 2020

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This study investigates the potential impacts of future warming on Global Solar Radiation (GSR) in different parts of Togo, West Africa. It used regional climate simulations of the International Centre for Theoretical Physics version 4.7 (RegCM4) driven by HadGEM-ES and NorESM-M GCM for three different time-slice periods: baseline , near future (2031-2060) and far future . The models produced realistic simulations of GSR and temperature characteristics over the stations and the simulations spread are within the observation uncertainty. The simulations compared fairly well with the NASA observations. Biases in both the GSR (10-37 Wm −2 or 5-17%) and temperature (0.1-2.0 °C or 0.5-7.3%) were found to be insignificant at p < 0.05 across all the stations under investigation. The results revealed increasing but insignificant trends (0.025-0.043 °C year −1 ) in observed temperature but decreasing (0.225-0.567 Wm −2 year −1 ) in GSR during the baseline period. The estimated increasing trends (0.004-0.035% year −1 ) in cloud cover were partly attributed to the observed variations in surface GSR. All models projected increase in temperature (0.2-4.6 °C) but decrease in GSR (0.5-5.8%) over the entire country at both annual and seasonal time-scales. The simulated future changes in temperatures and GSR were expected to increase further and decrease, respectively, by the end of the century. The study has noteworthy implication in solar photovoltaic power production under warmer climate. It suggests a need for improved technology with the least climate change impacts over the republic of Togo, West Africa.

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Modeling the impact of changes in Atlantic sea surface temperature on the climate of West Africa

Cited by 9 publications

References 50 publications

Effect of the African greenbelt position on West African summer climate: a regional climate modeling study

Effect of the African greenbelt position on West African summer climate: a regional climate modeling study

Simulating the Influence of doubled CO2 on the water budget over West Africa using RegCM4.7

Examination of potential impacts of future climate change on solar radiation in Togo, West Africa

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