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Southern Africa winter temperature shifts and their link to the Southern Annular Mode

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Abstract

The main characteristics of spatial and temporal variability of the winter (June–August) observed surface air minimum temperature (SAMT) of southern Africa (Africa south of the equator) were examined from 1960 to 2011. The empirical orthogonal function (EOF) analysis was used to extract the dominant mode of SAMT variability. Statistically significant shifts were detected in both the index derived from the spatially averaged regional SAMT and its EOF1 time coefficients. These discontinuities displayed a sharp rise followed by an abrupt drop during the periods around 1988 and 2007 respectively. The years corresponded to change points in the Southern Annular Mode index where the 1988 significant alteration to a relatively more positive index polarity was followed by a sudden weakening during the latter shift. The development of the warm phase coincided with the decoupling of SAM from SAMT. This occurred when the strengthening of the western ridge of the Mascarene High appeared to be coupled to the creation of anomalously low pressure systems over Angola and the region pole-ward of South Africa. In this epoch, the meridional wind over southern Africa reversed to become predominantly northerly and hence was symptomatic of warm temperature advection from the lower latitudes. However the post 2007 era, though still of indeterminate length, is characterized by a partial return to the pre-1988 circulation conditions. This implies that the impacts of SAM’s epochal alterations have implications not only for the current climate, but also for the interpretation of climate change over southern Africa.

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Acknowledgments

The authors wish to thank Bindura University of Science for the partial funding of this work. The climate explorer website is thanked for providing the platform on which the figures were constructed. This work was presented at the Earth Temp Network and Global Temp User Consultation Workshop, University of KIT, Karlsruhe, Germany, in June 2014. The principal author is very grateful for the constructive criticisms from the workshop participants especially the emphasis from Prof Chris Merchant from University of Reading to publish the results.

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Authors and Affiliations

  1. Department of Geography, Bindura University of Science, Bindura, Zimbabwe

    Desmond Manatsa, Caxton Matarira, Terrence D. Mushore & Chipo Mudavanhu

  2. Department of Ocean Technology, Policy, and Environment, University of Tokyo, Tokyo, Japan

    Desmond Manatsa

  3. International Center for Theoretical Physics (ICTP), 34151, Trieste, Italy

    Desmond Manatsa

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  1. Desmond Manatsa
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  2. Caxton Matarira
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  3. Terrence D. Mushore
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  4. Chipo Mudavanhu
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Correspondence to Desmond Manatsa.

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Manatsa, D., Matarira, C., Mushore, T.D. et al. Southern Africa winter temperature shifts and their link to the Southern Annular Mode. Clim Dyn 45, 2337–2350 (2015). https://doi.org/10.1007/s00382-015-2474-8

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  • DOI: https://doi.org/10.1007/s00382-015-2474-8

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