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Scientific Research and Essays Vol. 2 (6),
177-183, June 2007
ISSN 1992-2248
© 2007 Academic Journals
Full Length
Research Paper
Hygroscopic properties
of aerosols in the Sahel: preliminary results
Mouhamadou Bedou1,
Abdourahamane Konare1, Ibrah Seidou-Sanda2,
Paul Assamoi1 and Arona Diedhiou3
1LAPAMF,
Université de Cocody-Abidjan, BP 231 Abidjan, Cote d’Ivoire.
2Université
Abdou Moumouni, Faculté des Sciences, BP 10662 Niamey, Niger.
3IRD,
BP 11416 Niamey, Niger.
*Corresponding Author's E-Mail:
akonare@ictp.it.
Accepted 8 May, 2007 |
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Approximately three years
of sunphotometric measurements carried out in the locality of Bidi
(13.36°N; 2.30°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.
Key words:
Aerosol, optical depth, angstrom coefficient, atmospheric water content
and hygroscopic growth. |
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