The intensification of thermal extremes in west Africa

J. Ringard, B. Dieppois, S. Rome, A. Diedhiou, T. Pellarin, A. Konaré, A. Diawara, D. Konaté, B. K. Dje, G. L. Katiellou, I. Seidou Sanda, B. Hassane, T. Vischel, G. F. Garuma, G. Mengistu, M. Camara, A. Diongue, A. T. Gaye, L. Descroix

    Research output: Contribution to journalArticle

    5 Citations (Scopus)

    Abstract

    This study aims in filling the gap in understanding the relationship between trend and extreme in diurnal and nocturnal temperatures (Tx and Tn) over the Gulf of Guinea area and the Sahel. Time-evolution and trend of Tx and Tn anomalies, extreme temperatures and heat waves are examined using regional and station-based indices over the 1900-2012 and 1950-2012 periods respectively. In investigating extreme temperature anomalies and heat waves, a percentile method is used. At the regional and local scales, rising trends in Tx and Tn anomalies, which appear more pronounced over the past 60. years, are identified over the two regions. The trends are characterized by an intensification of: i) nocturnal/Tn warming over the second half of the 20th century; and ii) diurnal/Tx warming over the post-1980s. This is the same scheme with extreme warm days and warm nights. Finally annual number of diurnal and nocturnal heat waves has increase over the Gulf of Guinea coastal regions over the second half of the 20th century, and even more substantially over the post-1980s period. Although this trend in extreme warm days and nights is always overestimated in the simulations, from the Coupled Model Intercomparison Project Phase 5 (CMIP5), those models display rising trends whatever the scenario, which are likely to be more and more pronounced over the two regions in the next 50. years.

    Original languageEnglish
    Pages (from-to)66-77
    Number of pages12
    JournalGlobal and Planetary Change
    Volume139
    DOIs
    Publication statusPublished - Apr 1 2016

    Fingerprint

    warming
    anomaly
    temperature anomaly
    West Africa
    trend
    temperature
    simulation
    heat wave
    gulf
    CMIP
    index
    method
    station

    All Science Journal Classification (ASJC) codes

    • Oceanography
    • Global and Planetary Change

    Cite this

    Ringard, J., Dieppois, B., Rome, S., Diedhiou, A., Pellarin, T., Konaré, A., ... Descroix, L. (2016). The intensification of thermal extremes in west Africa. Global and Planetary Change, 139, 66-77. https://doi.org/10.1016/j.gloplacha.2015.12.009
    Ringard, J. ; Dieppois, B. ; Rome, S. ; Diedhiou, A. ; Pellarin, T. ; Konaré, A. ; Diawara, A. ; Konaté, D. ; Dje, B. K. ; Katiellou, G. L. ; Seidou Sanda, I. ; Hassane, B. ; Vischel, T. ; Garuma, G. F. ; Mengistu, G. ; Camara, M. ; Diongue, A. ; Gaye, A. T. ; Descroix, L. / The intensification of thermal extremes in west Africa. In: Global and Planetary Change. 2016 ; Vol. 139. pp. 66-77.
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    abstract = "This study aims in filling the gap in understanding the relationship between trend and extreme in diurnal and nocturnal temperatures (Tx and Tn) over the Gulf of Guinea area and the Sahel. Time-evolution and trend of Tx and Tn anomalies, extreme temperatures and heat waves are examined using regional and station-based indices over the 1900-2012 and 1950-2012 periods respectively. In investigating extreme temperature anomalies and heat waves, a percentile method is used. At the regional and local scales, rising trends in Tx and Tn anomalies, which appear more pronounced over the past 60. years, are identified over the two regions. The trends are characterized by an intensification of: i) nocturnal/Tn warming over the second half of the 20th century; and ii) diurnal/Tx warming over the post-1980s. This is the same scheme with extreme warm days and warm nights. Finally annual number of diurnal and nocturnal heat waves has increase over the Gulf of Guinea coastal regions over the second half of the 20th century, and even more substantially over the post-1980s period. Although this trend in extreme warm days and nights is always overestimated in the simulations, from the Coupled Model Intercomparison Project Phase 5 (CMIP5), those models display rising trends whatever the scenario, which are likely to be more and more pronounced over the two regions in the next 50. years.",
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    Ringard, J, Dieppois, B, Rome, S, Diedhiou, A, Pellarin, T, Konaré, A, Diawara, A, Konaté, D, Dje, BK, Katiellou, GL, Seidou Sanda, I, Hassane, B, Vischel, T, Garuma, GF, Mengistu, G, Camara, M, Diongue, A, Gaye, AT & Descroix, L 2016, 'The intensification of thermal extremes in west Africa', Global and Planetary Change, vol. 139, pp. 66-77. https://doi.org/10.1016/j.gloplacha.2015.12.009

    The intensification of thermal extremes in west Africa. / Ringard, J.; Dieppois, B.; Rome, S.; Diedhiou, A.; Pellarin, T.; Konaré, A.; Diawara, A.; Konaté, D.; Dje, B. K.; Katiellou, G. L.; Seidou Sanda, I.; Hassane, B.; Vischel, T.; Garuma, G. F.; Mengistu, G.; Camara, M.; Diongue, A.; Gaye, A. T.; Descroix, L.

    In: Global and Planetary Change, Vol. 139, 01.04.2016, p. 66-77.

    Research output: Contribution to journalArticle

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    AU - Dieppois, B.

    AU - Rome, S.

    AU - Diedhiou, A.

    AU - Pellarin, T.

    AU - Konaré, A.

    AU - Diawara, A.

    AU - Konaté, D.

    AU - Dje, B. K.

    AU - Katiellou, G. L.

    AU - Seidou Sanda, I.

    AU - Hassane, B.

    AU - Vischel, T.

    AU - Garuma, G. F.

    AU - Mengistu, G.

    AU - Camara, M.

    AU - Diongue, A.

    AU - Gaye, A. T.

    AU - Descroix, L.

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    Ringard J, Dieppois B, Rome S, Diedhiou A, Pellarin T, Konaré A et al. The intensification of thermal extremes in west Africa. Global and Planetary Change. 2016 Apr 1;139:66-77. https://doi.org/10.1016/j.gloplacha.2015.12.009