Bedou M. auteur aut IRD Konare A. auteur aut IRD Seidou-Sanda I. auteur aut IRD Assamoi P. auteur aut IRD Diedhiou Arona auteur aut IRD text journalArticle eng text/pdf born digital access Approximately three years of sunphotometric measurements carried out in the locality of Bidi (13.36 degrees N; 2.30 degrees W) in Burkina Faso (West Africa) from October 1986 to January 1989 were used to estimate the atmospheric precipitable water vapour (APW) and the Angstrom exponent values a. A study of the relationship between these two parameters on a seasonal time scale shows that an increase of water vapour in the Sahel is associated with a decrease of a values, indicating hygroscopic growth of aerosol particles. This result shows that the Sahel aerosol particles may grow in size through water vapour absorption due to hygroscopic properties. specialized aerosol optical depth Angstrom coefficient atmospheric water content and hygroscopic growth 021 2 6 177-183 2007 1992-2248 https://www.documentation.ird.fr/hor/fdi:010044085 1992-2248 [F B010044085] https://www.documentation.ird.fr/hor/fdi:010044085 https://www.documentation.ird.fr/intranet/publi/2008/11/010044085.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2008-12-05 2017-08-23 fdi:010044085 fre