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Tropical systems from the southwest Indian Ocean into southern Africa: impacts, dynamics and projected changes
Expanded Title:This project aimed to investigate the influence of tropical systems (such as cyclones, storms, and depressions) from the South West Indian Ocean (SWIO), over the Limpopo River Basin. These systems are associated with the widespread heavy rainfall and subsequent flooding over the Limpopo River Basin. The resultant rainfall over the Limpopo River Basin is historically confined to the January-March period, with a maximum around early February. Less than 10% of the average annual rainfall can be attributed to these systems, yet widespread heavy rainfall events are mostly the result thereof over the region. Deep negative vorticity values are usually confined to regions to the south of the southern African subcontinent while tropical systems are steered towards and into the subcontinent within a warm subtropical upper air ridge. On climate change time scales, the influence of tropical systems from the SWIO over the Limpopo River Basin is expected to decrease by the late 21st century under enhanced anthropogenic forcing. This is due to a simulated intensification of the subtropical high pressure systems over the northern and eastern parts of the southern African subcontinent, responsible for steering these systems further north, where an increase is simulated.
Date Published:01/03/2013
Document Type:Research Report
Document Subjects:Water Resource Management/IWRM - Catchment Management, Water Resource Management/IWRM - Hydrogeology
Document Keywords:Hydrology
Document Format:Report
Document File Type:pdf
Research Report Type:Standard
WRC Report No:1847/1/12
ISBN No:978-1-4312-0384-0
Authors:Malherbe J; Engelbrecht FA; Landman WA; Lumsden T; Theale C
Project No:K5/1847
Organizations:ARC-Institute for Soil, Climate and Water; CSIR; School of Bioresources Engineering and Environmental Hydrology University of KwaZulu-Natal
Document Size:43 540 KB
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