scholarly journals Water vapour transport associated with tropical–temperate trough systems over southern Africa and the southwest Indian Ocean

2004 ◽  
Vol 24 (5) ◽  
pp. 555-568 ◽  
Author(s):  
Martin C. Todd ◽  
Richard Washington ◽  
Paul I. Palmer
Keyword(s):  
Indian Ocean ◽  
Water Vapour ◽  
Southern Africa ◽  
Vapour Transport ◽  
Southwest Indian Ocean ◽  
Water Vapour Transport ◽  
Tropical Temperate Trough

Water vapour transport over the Indian Ocean during summer 1975

Tellus ◽  
1981 ◽  
Vol 33 (5) ◽  
pp. 476-487 ◽  
Author(s):  
Daniel Cadet ◽  
Gilles Reverdin
Keyword(s):  
Indian Ocean ◽  
Water Vapour ◽  
Vapour Transport ◽  
Water Vapour Transport ◽  
The Indian Ocean

scholarly journals Water vapour transport from the tropical Atlantic and summer rainfall in tropical southern Africa

2006 ◽  
Vol 28 (2-3) ◽  
pp. 113-123 ◽  
Author(s):  
N. Vigaud ◽  
Y. Richard ◽  
M. Rouault ◽  
N. Fauchereau
Keyword(s):  
Water Vapour ◽  
Southern Africa ◽  
Summer Rainfall ◽  
Tropical Atlantic ◽  
Vapour Transport ◽  
Water Vapour Transport

scholarly journals Circulation pattern controls of wet days and dry days in Free State, South Africa

2021 ◽  
Author(s):  
Chibuike Chiedozie Ibebuchi
Keyword(s):  
South Africa ◽  
Indian Ocean ◽  
Atmospheric Circulation ◽  
Southern Africa ◽  
Austral Summer ◽  
Free State ◽  
Austral Spring ◽  
Study Region ◽  
Southwest Indian Ocean ◽  
South Indian

AbstractAtmospheric circulation is a vital process in the transport of heat, moisture, and pollutants around the globe. The variability of rainfall depends to some extent on the atmospheric circulation. This paper investigates synoptic situations in southern Africa that can be associated with wet days and dry days in Free State, South Africa, in addition to the underlying dynamics. Principal component analysis was applied to the T-mode matrix (variable is time series and observation is grid points at which the field was observed) of daily mean sea level pressure field from 1979 to 2018 in classifying the circulation patterns in southern Africa. 18 circulation types (CTs) were classified in the study region. From the linkage of the CTs to the observed rainfall data, from 11 stations in Free State, it was found that dominant austral winter and late austral autumn CTs have a higher probability of being associated with dry days in Free State. Dominant austral summer and late austral spring CTs were found to have a higher probability of being associated with wet days in Free State. Cyclonic/anti-cyclonic activity over the southwest Indian Ocean, explained to a good extent, the inter-seasonal variability of rainfall in Free State. The synoptic state associated with a stronger anti-cyclonic circulation at the western branch of the South Indian Ocean high-pressure, during austral summer, leading to enhanced low-level moisture transport by southeast winds was found to have the highest probability of being associated with above-average rainfall in most regions in Free State. On the other hand, the synoptic state associated with enhanced transport of cold dry air, by the extratropical westerlies, was found to have the highest probability of being associated with (winter) dryness in Free State.

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