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IDENTIFICATION DE TENDANCES RÉCENTES ET RUPTURES D'HOMOGÉNÉITE DES TEMPÉRATURES : EXEMPLE EN AFRIQUE DE L'OUEST ET SUR LE GOLFE DE GUINÉE

Abstract : In the present context of environmental and climatic change, any trend in meteorological parameters, especially in temperature, is often discussed. This work aims to evaluate long term temperature trends and break points at two weather stations in West Africa (Niamey / Niger and Abidjan / Ivory Coast) and for sea surface temperatures (SSTs) in the Gulf of Guinea. The objective is to examine whether the model predictions of the fifth IPCC assessment report (2013) are consistent with observations and if the evolution of meridian thermal gradients will impact the West African monsoon in a context of global atmospheric and oceanic warming. Various heterogeneities are detected in the series: thermal break points are clearly identified in Niamey and Abidjan, in 1983 and 1986, respectively. After the mid-1980s, annual temperature anomalies show significant warming trends while equatorial Atlantic SST does not present any significant break point. It is however found that the large scale contrast of temperatures between the ocean and the continent represented by the series have increased by 0.07°C per decade during the last 30 years.
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Submitted on : Saturday, July 11, 2015 - 8:41:27 PM
Last modification on : Tuesday, October 19, 2021 - 6:59:51 PM
Long-term archiving on: : Monday, October 12, 2015 - 11:39:46 AM

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Sandra Rome, Guy Caniaux, Justine Ringard, Bastien Dieppois, Arona Diedhiou. IDENTIFICATION DE TENDANCES RÉCENTES ET RUPTURES D'HOMOGÉNÉITE DES TEMPÉRATURES : EXEMPLE EN AFRIQUE DE L'OUEST ET SUR LE GOLFE DE GUINÉE. 28ème colloque internationnal de l'AIC, Université de Liège, Laboratoire de Climatologie et Topoclimatologie, Jul 2015, Liège, Belgique. pp.591-596. ⟨halshs-01175703⟩

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