Physics
Scientific paper
Sep 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3217701w&link_type=abstract
Geophysical Research Letters, Volume 32, Issue 17, CiteID L17701
Physics
56
Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Global Change: Climate Dynamics (0429, 3309), Atmospheric Processes: General Circulation (1223), Atmospheric Processes: Land/Atmosphere Interactions (1218, 1631, 1843)
Scientific paper
Atmospheric aerosols play an important though uncertain role in the Earth's climate system. The Bodélé Depression in Chad stands out as the planet's largest source of dust, yet very little is known about the atmospheric circulation that maintain this source. We investigate what key large-scale features of the circulation over the Bodélé account for its primacy as a mineral aerosol source. We show, for the first time, the structure and characteristics of the Bodélé Low Level Jet (LLJ) which has a maximum speed near 18°N, 19°E at 925 hPa. It is strongest in the northern winter, receding with the advance of summer in phase with dustiness in the Bodélé. Variability of dust over the Bodélé occurs contemporaneously with the ridging of the Libyan High and pulsing of the pressure gradient which drives the northeasterlies in which the LLJ is embedded.
Todd Martin C.
Washington Richard
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