Contemporary spatio-temporal patterns of snow cover over the Drakensberg
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 occu...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Academy of Science of South Africa
2010-01-01
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| Series: | South African Journal of Science |
| Online Access: | http://archive.sajs.co.za/index.php/SAJS/article/view/96 |
| Summary: | 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. |
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| ISSN: | 0038-2353 1996-7489 |