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Remote sensing of aerosol optical characteristics in sub-Sahel, West Africa

Pandithurai, G and Pinker, RT and Dubovik, O and Holben, BN and Aro, TO (2001) Remote sensing of aerosol optical characteristics in sub-Sahel, West Africa. Journal of Geophysical Research: Atmospheres, 106 (D22). pp. 28347-28356.

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Abstract

We have determined the characteristics of sub-Sahelian aerosols from a 2-year record of continuous ground-based measurements, made at the University of Ilorin, Ilorin (08°19′N, 04°20′E), Nigeria, in cooperation with the Aerosol Robotic Network. Observations of spectral aerosol optical depths during the dusty harmattan season indicate more than a twofold increase, when compared to other seasons. Retrieved columnar volume size distributions show the existence of bimodality with a dominant coarse mode. The retrieved size distributions were grouped according to different ranges of aerosol optical depths to characterize the aerosols for this particular region. Monthly means of retrieved single-scattering albedos show a sharp decrease from ∼0.95 to ∼0.85 at 500 nm from the preharmattan to the harmattan season when biomass burning is also practiced, increasing the presence of absorbing aerosols. On the basis of these comprehensive observations, we propose to augment existing desert aerosol models, as presented in the literature, to better characterize the dust outbreak season in West Africa, which is quite prolonged and overlaps with the biomass burning season

Item Type: Article
Additional Information: Copyright of this article belongs to American Geophysical Union
Uncontrolled Keywords: aerosol; biomass burning; dust; optical depth; remote sensing, Africa; sub-Sahel
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 26 Apr 2015 05:12
Last Modified: 26 Apr 2015 05:12
URI: http://moeseprints.incois.gov.in/id/eprint/1559

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