DSpace
 

Researchspace >
General science, engineering & technology >
General science, engineering & technology >
General science, engineering & technology >

Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/5988

Title: Tropical systems from the southwest Indian Ocean making landfall over the Limpopo River Basin, southern Africa: a historical perspective
Authors: Malherbe, J
Engelbrecht, FA
Landman, WA
Engelbrecht, CJ
Keywords: Tropical cyclone
Landfall
Rainfall cyclicity
Tropical systems
Southern Africa tropical systems
Fourier analysis
Closed-low tracking
Issue Date: Mar-2011
Publisher: Wiley
Citation: Malherbe, J, Engelbrecht, FA, Landman, WA and Engelbrecht, CJ. 2011. Tropical systems from the southwest Indian Ocean making landfall over the Limpopo River Basin, southern Africa: a historical perspective. International Journal of Climatology, vol. 32(7), pp 1018-1032
Series/Report no.: Workflow;8575
Abstract: The study provides perspective on the contribution of landfalling tropical systems (cyclones, depressions, storms and lows) from the southwest Indian Ocean (SWIO) towards rainfall over the eastern interior of southern Africa, over the period 1948–2008. Although these systems contribute to <10% of the annual rainfall occurring over the region, their relative contribution to local and widespread heavy rainfall events is shown to be highly significant. About 50% of widespread heavy rainfall events over northeastern South Africa are caused by landfalling tropical systems. Fourier analysis performed on the time series of rainfall occurring over northeastern South Africa in association with these systems reveals the existence of a quasi-18-year cycle. The cycle coincides with the well-known quasi-18-year Dyer–Tyson cycle in rainfall over the summer rainfall region of South Africa. These results suggest that atmospheric and surface conditions leading to wet phases of the Dyer–Tyson cycle also favour the landfall and subsequent westward movement of tropical systems from the SWIO over southern Africa – and their eventual contribution to rainfall over northeastern South Africa and southern Zimbabwe.
Description: Copyright: 2011 Wiley. This is the post-print version of the work. The definitive version is published in the International Journal of Climatology, vol. 32(7), pp 1018-1032
URI: http://onlinelibrary.wiley.com/doi/10.1002/joc.2320/abstract
http://hdl.handle.net/10204/5988
ISSN: 0899-8418
1097-0088
Appears in Collections:Climate change
General science, engineering & technology

Files in This Item:

File Description SizeFormat
Landman14_2011.pdf1.37 MBAdobe PDFView/Open
View Statistics

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace - Feedback