The bi-decadal rainfall cycle, Southern Annular Mode and tropical cyclones over the Limpopo River Basin, southern Africa

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dc.contributor.author Malherbe, Johan B.
dc.contributor.author Landman, W.A. (Willem Adolf), 1964-
dc.contributor.author Engelbrecht, F.A. (Francois Alwyn)
dc.date.accessioned 2014-09-04T10:45:13Z
dc.date.available 2014-09-04T10:45:13Z
dc.date.issued 2014-06
dc.description.abstract The association between bi-decadal rainfall variability over southern Africa and the rainfall contributed by tropical cyclonic systems from the Southwest Indian Ocean (SWIO) provides a potential means towards understanding decadal-scale variability over parts of the region. A multi-decadal period is considered, focusing on the anomalous tropospheric patterns that induced a particularly wet 8-year long sub-period over the Limpopo River Basin. The wet sub-period was also characterized by a larger contribution to rainfall by tropical cyclones and depressions. The findings suggest that a broadening of the Hadley circulation underpinned by an anomalous anticyclonic pattern to the east of southern Africa altered tropospheric steering flow, relative vorticity and moisture contents spatially during the subperiod of 8 years. These circulation modulations induced enhanced potential for tropical systems from the SWIO to cause precipitation over the Limpopo River Basin. The same patterns are also conducive to increasing rainfall over the larger subcontinent, therefore explaining the positive association in the bi-decadal rainfall cycle and rainfall contributed by tropical cyclonic systems from the SWIO. The regional circulation anomalies are also explained in hemispheric context, specifically in relation to the Southern Annular Mode, towards understanding variation over other parts of the Southern Hemisphere at this time scale. en_US
dc.description.librarian hb2014 en_US
dc.description.sponsorship Water Research Commission (WRC Project No.K5/1847) in South Africa and the Agricultural Research Council (Project No. GW 50/053). en_US
dc.description.uri http://link.springer.com/journal/382 en_US
dc.identifier.citation Malherbe, J, Landman, WA & Engelbrecht, FA 2014, 'The bi-decadal rainfall cycle, Southern Annular Mode and tropical cyclones over the Limpopo River Basin, southern Africa', Climate Dynamics, vol. 42, no.11-12, pp. 3121-3138. en_US
dc.identifier.issn 0930-7575 (print)
dc.identifier.issn 1432-0894 (online)
dc.identifier.other 10.1007/s00382-013-2027-y
dc.identifier.uri http://hdl.handle.net/2263/41920
dc.language.iso en en_US
dc.publisher Springer en_US
dc.rights © Springer-Verlag Berlin Heidelberg 2013. The original publication is available at : http://link.springer.com/journal/382. en_US
dc.subject Tropical cyclones en_US
dc.subject Southern Annular Mode en_US
dc.subject Limpopo River Basin, southern Africa en_US
dc.subject Bi-decadal rainfall en_US
dc.title The bi-decadal rainfall cycle, Southern Annular Mode and tropical cyclones over the Limpopo River Basin, southern Africa en_US
dc.type Postprint Article en_US


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