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Interhemispheric dynamics of the African rainbelt during the late Quaternary

Singarayer, Joy S. ; Burrough, Sallie L.

Quaternary science reviews, 2015-09, Vol.124, p.48-67 [Periódico revisado por pares]

Elsevier Ltd

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  • Título:
    Interhemispheric dynamics of the African rainbelt during the late Quaternary
  • Autor: Singarayer, Joy S. ; Burrough, Sallie L.
  • Assuntos: Africa ; Climate change ; Intertropical Convergence Zone (ITCZ) ; Quaternary ; Tropical rainbelt
  • É parte de: Quaternary science reviews, 2015-09, Vol.124, p.48-67
  • Descrição: The spatial pattern of precipitation variability in tropical and subtropical Africa over the late Quaternary has long been debated. Prevailing hypotheses variously infer (1) insolation-controlled asymmetry of wet phases between hemispheres, (2) symmetric contraction and expansion of the tropical rainbelt, and (3) independent control on moisture available in Southern Africa via sea surface temperatures in the Indian Ocean. In this study we use climate-model simulations covering the last glacial cycle (120kyr) with HadCM3 and the multi-model ensembles from PMIP3 (the Palaeoclimate Model Intercomparison Project) to investigate the long-term behaviour of the African rainbelt, and test these simulations against existing empirical palaeohydrological records. Through regional model-data comparisons we find evidence for the validity of several hypotheses, with various proposed processes occurring concurrently but with different regional emphasis (e.g. asymmetric shifts at the seasonal extremes and symmetric expansions/contractions towards West equatorial regions). Crucially, variations in rainfall are associated with multiple forcing mechanisms that vary in their dominance both spatially and temporally over the glacial cycle; an important consideration when interpreting and extrapolating from often relatively short palaeoenvironmental records. •We use model simulations for the last 120kyr to explore African rainbelt variations.•The simulations were compared with existing empirical palaeohydrological records.•We find validity in several hypotheses for mechanisms of hydroclimate variation.•These mechanisms occur concurrently, with different regional emphases.•The mechanisms forcing rainbelt variations vary temporally as well as spatially.
  • Editor: Elsevier Ltd
  • Idioma: Inglês
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