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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Wet and dry spells within particularly wet and dry summers in the South African summer rainfall region
Climate Research, Volume 26, No. 1, Year 2004
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Description
Atmospheric moisture transport over southern Africa and surrounding oceans is considered during wet and dry conditions over the South African summer rainfall region. Wet and dry synoptic spells within wet and dry austral summers are examined. A link between synoptic and seasonal timescales is investigated using seasonal statistics of wet and dry spells. Dry synoptic spells exhibit divergent moisture flux over South Africa, with inflow from the mid-latitude ocean regions to the south. Cyclonic features off the east coast may exist and attract moisture away from South Africa. For wet synoptic spells, there tends to be increased moisture flux from the tropical or subtropical southwest Indian Ocean (SWIO), either associated with ridging along the east coast or a deep low over the interior. Seasonal modulations of the intensity of the heat low over Angola/Namibia appear important for influencing early (OND) and late (JFM) summer rainfall over South Africa. This low may act as the tropical source for tropical temperate troughs and their associated cloudbands that are major synoptic rain-producing systems. Wet (dry) summers are often associated with a southward (northward) shift and strengthening (weakening) of the ITCZ over tropical southeastern Africa. Seasonal rainfall is found to be related to the distribution of wet and dry spells within the season, such that wetter seasons tend to have longer or more intense wet spells rather than a greater number of wet spells. © Inter-Research 2004.
Authors & Co-Authors
Cook, Celia
South Africa
Climate Systems Analysis Group
Reason, Christopher J.C.
South Africa, Cape Town
University of Cape Town
Hewitson, Bruce C.
South Africa
Climate Systems Analysis Group
Statistics
Citations: 185
Authors: 3
Affiliations: 2
Identifiers
Doi:
10.3354/cr026017
ISSN:
0936577X
Study Locations
Angola
Namibia
South Africa