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South African Journal of Science

versão impressa ISSN 0038-2353

Resumo

MULDER, N.  e  GRAB, S.W.. Contemporary spatio-temporal patterns of snow cover over the Drakensberg. S. Afr. j. sci. [online]. 2009, vol.105, n.5-6, pp. 228-233. ISSN 0038-2353.

Sixteen years of low-resolution Landsat 5 and 7 satellite images were used to construct Boolean images of snow cover over the Drakensberg through a GIS. Contemporary patterns of snow cover, including altitudinal variations, were determined for individual months and various seasons. The seasonal occurrence and spatial influence of various snow-producing weather systems were determined through remote sensing and the consultation of daily climate data and synoptic charts. A proportional relationship was found between altitude of snow-covered pixels and the number of occurrences that pixels were covered in snow. The highest incidence and most widespread snow cover occurred from June to August; spring snow occurred preferentially in the central and southern Drakensberg regions. Cold fronts and associated cut-off lows accounted for about 80% of snow cover over the Drakensberg.

Palavras-chave : Drakensberg; satellite images; snow-cover patterns; weather systems.

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