Climate Variability in the Sudano-Guinean Transition Area and Its Impact on Vegetation: The Case of the Lamto Region in Côte D’Ivoire

Diawara, Adama; Yoroba, Fidèle; Kouadio, Yves K.; Kouassi, K. Benjamin; Assamoi, E.; Diedhiou, Arona; Assamoi, P.

doi:10.1155/2014/831414

Cited by 25 publications

(40 citation statements)

References 39 publications

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“…is phase in cocoa production coincided with the period of rainfall deficit across West Africa spreading from the Sahel [7,17,[33][34][35] to the Guinean coast areas, especially in Côte d'Ivoire [17]. us, the low cocoa production during this period could be related to the drought that occurred from 1960 to 1990. is dry condition affected the whole West Africa from the Sahel to the Guinean coast [14,[16][17][18]. It may imply a hydric stress on the cocoa plants and then reduce the cocoa yield.…”

Section: Discussionmentioning

confidence: 99%

“…In the same vein, several works as Nicholson [10], Lamb [11], Folland et al [12], Lamb and Peppler [13], Fontaine and Janicot [14], and Nicholson and Grist [15] evaluate possible mechanisms associated with these deficits in rain amount. For example, these drought episodes are sequences of continuous rainfall deficit periods from 1960 to 1990, which were not only limited to the Sahel area but spread to the coastal regions of West Africa [14,16], especially in Côte d'Ivoire [17,18]. e dry conditions led to a serious disturbance in water resources and then a disaster for the populations and cause a loss in livestock and a gradual disappearance of certain export crops.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Rainfall and Temperature Conditions for a Perennial Crop in Tropical Wetland: A Case Study of Cocoa in Côte d’Ivoire

Yoroba

Kouassi

Diawara

et al. 2019

Advances in Meteorology

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e rainfall and temperature conditions are evaluated for the first time during the 1989-2006 period, in six main cocoa production areas (Abengourou, Agboville, Daloa, Dimbokro, Guiglo, and Soubre) of Côte d'Ivoire using data from SODEXAM (groundbased observation) and the ex-CAISTAB. Statistical analysis shows an important sensitivity of cocoa production to rainfall conditions in all regions. It is worth noting that only the major rainy season from April to July and the rainfall amount of the little dry season from August to September affect the cocoa production for an 80% confidence level. is influence varies from one cacao production area to another. Moreover, the effects related to temperature on the cocoa yield seem to represent a smaller contribution of climate impact than those related to precipitation during the studied period. e temperature change remains in the acceptable range of values, between 25°C and 29°C, which is a favorable condition for cocoa growing. ese findings are obtained despite the significant contributions from nonclimatic factors, to year-to-year variability in cocoa production.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation of Rainfall and Temperature Conditions for a Perennial Crop in Tropical Wetland: A Case Study of Cocoa in Côte d’Ivoire

Yoroba

Kouassi

Diawara

et al. 2019

Advances in Meteorology

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“…Located in West Africa, this region is under a humid climate controlled by the West Africa Monsoon (WAM) system [34,35] during the year. e rainfall regime is related to the local climate type underlined by Kouadio et al [34] and Diawara et al [36] which depends largely on large scale atmospheric circulation and continental meteorological conditions [37]. Its seasonal range follows the same variation that the latitudinal displacement of the intertropical convergence zone (ITCZ), itself linked to uctuations in the trade wind system and the oceanic variables over the tropical Atlantic [38,39].…”

Section: Study Areamentioning

confidence: 98%

Twenty-First Century Projected Changes in Extreme Temperature over Côte d’Ivoire (West Africa)

Yapo

Diawara

Yoroba

et al. 2019

International Journal of Geophysics

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The projection of the future climate changes is of paramount importance inasmuch as it contributes to provide useful information for adaptation planning worldwide to local scales. This study investigated the future changes using four temperature related indices based on an ensemble of 14 CORDEX-Africa simulations at 0.44° × 0.44° of resolution under the RCP4.5 and RCP8.5 scenarios. These indices indicate moderate extremes over Côte d’Ivoire. The results show an increase in the warm extreme indices such as the warm spell days index (HWFI), very warm days frequency index (TX90P), and the warm nights frequency index (TN90P) over the entire country under both emission scenarios. The increase in these indices was higher under RCP8.5 and reached 85, 72, and 90% for HWFI, TX90P, and TN90P respectively. In addition, the magnitude of the changes is relevant along the coastal areas in the 2031–2060 and 2071–2100 periods. Moreover, the intra period extreme temperature range (ETR) shows future decrease following a south-north gradient with values in the range [−0.5; 1.5°C] over the country during January–March (JFM) and October–December (OND) seasons whereas an increase (~0.5°C) is projected for April–June (AMJ) and July–September (JAS) seasons, particularly in the central and northern parts. The minimum temperature increases faster than the maximum, except in AMJ and JAS in the central and northern regions. On the other hand, the changes in the indices based on the mean values of the reference period (1976–2005) are in concordance to the expected warming at the end of the twenty-first century with important trends. The projected changes are, however, subject to uncertainties, which are higher under RCP8.5 than under RCP4.5 scenarios. Overall, these changes are meaningful as all the 14 CORDEX-Africa simulations agree to an increase of warm extreme temperature.

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“…The ecosystem of Lamto (5˚02W and 6˚13N, Figure 1) is located in a tropical subhumid savannah across the Sudano-Guinean Transition Area [24]. The region is of about 160 km north of Abidjan and its climate is controlled by the West African Monsoon (WAM).…”

Section: Study Areamentioning

confidence: 99%

“…The region is of about 160 km north of Abidjan and its climate is controlled by the West African Monsoon (WAM). The recorded annual mean rainfall is about 1200 mm, with important seasonal and interannual variability [24] while the mean annual temperature is ~27˚C with a seasonal temperature range of ±2˚C [25]. The main dry season extends from December to February and the wet season is from March to November, with a short dry season in August ( Figure 2).…”

Section: Study Areamentioning

confidence: 99%

Understanding the Local Carbon Fluxes Variations and Their Relationship to Climate Conditions in a Sub-Humid Savannah-Ecosystem during 2008-2015: Case of Lamto in Cote d’Ivoire

Tiémoko¹,

Yoroba²,

Diawara³

et al. 2020

ACS

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The temporal variations of the Gross Primary Productivity (GPP), the Total Ecosystem Respiration (TER) and the Net Ecosystem Exchange (NEE), and their responses to meteorological conditions (e.g. temperature, radiative flux and precipitation) at Lamto, in wet savannah region across Côte d'Ivoire are analyzed using GFED-CASA and daily meteorological data recorded over the 2008-2015 period. The study shows the links between these carbon fluxes and climate variability at Lamto that is subject to high anthropogenic pressures and seasonal bushfires. The correlative statistics from multiple regression methods were used to assess the different relationships and show how they change in time. The results show important seasonal variability in the Gross Primary Productivity and the Total Ecosystem Respiration mainly associated with the changes in temperature and radiative flux. In addition, the statistical analysis suggests a high correlation between meteorological conditions and the GPP and TER. These climatic conditions may explain 83% and 79% of the variances of GPP and TER respectively. Moreover, the interannual variability of the Net Ecosystem Exchange indicates that around Lamto, in the subhumid savannah, the ecosystem behaves as a carbon sink similar to other West African ecosystems. On the other hand, there is no clear link between the NEE and temperature, radiative flux and precipitation. This lack of connection may suggest a limited response of the NEE interannual dynamics related to the changes in climatic features.

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Climate Variability in the Sudano-Guinean Transition Area and Its Impact on Vegetation: The Case of the Lamto Region in Côte D’Ivoire

Cited by 25 publications

References 39 publications

Evaluation of Rainfall and Temperature Conditions for a Perennial Crop in Tropical Wetland: A Case Study of Cocoa in Côte d’Ivoire

Evaluation of Rainfall and Temperature Conditions for a Perennial Crop in Tropical Wetland: A Case Study of Cocoa in Côte d’Ivoire

Twenty-First Century Projected Changes in Extreme Temperature over Côte d’Ivoire (West Africa)

Understanding the Local Carbon Fluxes Variations and Their Relationship to Climate Conditions in a Sub-Humid Savannah-Ecosystem during 2008-2015: Case of Lamto in Cote d’Ivoire

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