Abrupt shift of the ITCZ over West Africa and intra-seasonal variability

Details Abrupt shift of the ITCZ over West Africa and intra-seasonal variability Abrupt shift of the ITCZ over West Africa and intra-seasonal variability

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.3353s&link_type=abstract

Geophysical Research Letters, Volume 27, Issue 20, p. 3353-3356

Other

67

Meteorology And Atmospheric Dynamics: Climatology, Meteorology And Atmospheric Dynamics: Precipitation, Meteorology And Atmospheric Dynamics: Synoptic-Scale Meteorology, Meteorology And Atmospheric Dynamics: Tropical Meteorology

Scientific paper

The onset of the monsoon system over West Africa is linked to the northward migration of the Inter-Tropical Convergence Zone (ITCZ) during the northern spring and summer. By using daily gridded rainfall data and NCEP/NCAR wind reanalyses over the period 1968-1990, we show that this migration is characterized by an abrupt latitudinal shift of the ITCZ in late June from a quasi-stationary location at 5N in May-June to another quasi-stationary location at 10N in July-August. A composite analysis based on the shift dates shows that this northward shift is associated with the occurrence of a westward-travelling monsoon depression pattern over the Sahel with characteristic periodicities of 20-40 days.

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