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African monsoons, Part 2: Synoptic-scale wave disturbances in the intertropical convergence zone over north Africa
Author(s) -
Kshudiram Saha,
Sujata Saha
Publication year - 2002
Publication title -
mausam
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.243
H-Index - 12
ISSN - 0252-9416
DOI - 10.54302/mausam.v53i2.1635
Subject(s) - intertropical convergence zone , geology , westerlies , monsoon trough , climatology , baroclinity , african easterly jet , convergence zone , tropical wave , jet stream , monsoon , anticyclone , geography , meteorology , tropical cyclone , precipitation , jet (fluid) , physics , thermodynamics
In this part, the paper discusses several aspects of the origin, structure, development and movement of wave disturbances over the North African tropical zone during the northern summer. Analyzing the cases often actual wave disturbances which later in their life cycles developed into hurricanes over the Atlantic, it finds that though the horizontal and vertical shear of the mean zonal wind associated with the mid-tropospheric easterly jet over Africa satisfies the condition of dynamical instability under certain restrictive boundary conditions, it is the influence of a large-amplitude baroclinic wave in mid-latitude westerlies upon a stationary wave in the mountainous region of the east-central north Africa that appears to trigger the birth of a wave disturbance in the intertropical convergence zone over the Nile valley of Sudan between the Marra and the Ethiopian mountains. Physical processes likely to be important in the formation, development and movement of the disturbances are pointed out.

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