Role of the Hoggar massif in the West African monsoon onset

Details Role of the Hoggar massif in the West African monsoon onset Role of the Hoggar massif in the West African monsoon onset

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3201705d&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 1, CiteID L01705

Physics

Geophysics

15

Global Change: Climate Dynamics (0429, 3309), History Of Geophysics: Atmospheric Sciences, Atmospheric Processes: Boundary Layer Processes, Atmospheric Processes: Climatology (1616, 1620, 3305, 4215, 8408), Atmospheric Processes: Land/Atmosphere Interactions (1218, 1631, 1843)

Scientific paper

It has been observed that the West African monsoon onset is concomitant with the enhancement of the Saharan heat low. We show through a combined diagnostic and linear modeling study a possible interaction between northern Africa orography and the deepening of the Saharan heat low at the time of the monsoon onset. The amplification of an anticyclonic circulation above and north of the Hoggar massif leads to an increase and a southeasterly-northeasterly rotation of the wind ahead of the Hoggar which contribute to an increased leeward-trough effect enhancing the Saharan heat low. The Atlas does not play any role during the monsoon onset but contributes to the mean climatological location of the Saharan heat low.

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