Abstract
The stagnation and mixing of various air masses at the level of the ITCZ in the dry season, together with the absence of rain, favor, in the Guinean savannah, the formation of a well-aged and homogeneous aerosol made up of very active mixed nuclei. When the drought increases, the aerosol always remains an aged one, i.e. absence of particles with radius r < 0.02 μm, no nucleation mode. However, different properties show a younger and less homogeneous aerosol, i.e. very high counts in all the categories of particles (the concentration of nuclei activated at the supersaturation S {reversed tilde equals} 0.32% reaches 9960 cm-3), poor correlations between the concentrations of various groups of particles and no fog. When the fires are frequent and spread all over the savannah, a permanent addition of new particles to the local background aerosol (due to a complicated circulation) prevents the ageing of the aerosol that is observed during the usual drought with a moderate extension of bushfires. © 1986.
Recommended Citation
F. Désalmand et al., "General Features Of The Aerosol Observed In The Guinean Savannah At The Level Of The ITCZ Influence Of The Drought," Journal of Aerosol Science, vol. 17, no. 2, pp. 149 - 156, Elsevier, Jan 1986.
The definitive version is available at https://doi.org/10.1016/0021-8502(86)90062-5
Department(s)
Physics
International Standard Serial Number (ISSN)
0021-8502
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2023 Elsevier, All rights reserved.
Publication Date
01 Jan 1986
