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North African climate variability. Part 2: Tropical circulation systems.
- Source :
- Theoretical & Applied Climatology; 2007, Vol. 89 Issue 1-2, p37-49, 13p, 1 Diagram, 2 Charts, 4 Graphs, 7 Maps
- Publication Year :
- 2007
-
Abstract
- Tropical North African climate variability is investigated using a Sahel rainfall index and streamflow of the Nile River in the 20<superscript>th</superscript> century. The mechanisms that govern tropical North Africa climate are diagnosed from NCEP reanalysis data in the period 1958ā1998: spatially ā using composite and correlation analysis, and temporally ā using wavelet co-spectral analysis. The Sahelian climate is characterised by a decadal rhythm, whilst the mountainous eastern and equatorial regions exhibit interannual cycles. ENSO-modulated zonal circulations over the Atlantic/Pacific sector are important for decadal variations, and create a climatic polarity between South America and tropical North Africa as revealed through upper-level velocity potential and convection patterns. A more localised NāS shift in convection between the Sahel and Guinea coast is associated with the African Easterly Jet. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0177798X
- Volume :
- 89
- Issue :
- 1-2
- Database :
- Complementary Index
- Journal :
- Theoretical & Applied Climatology
- Publication Type :
- Academic Journal
- Accession number :
- 24718479
- Full Text :
- https://doi.org/10.1007/s00704-006-0243-7