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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 53, Iss. 14 — May. 10, 2014
  • pp: 2964–2973

Aerosols in coastal and inland areas in the equatorial African belt

Taddeo Ssenyonga, Dennis Muyimbwa, Willy Okullo, Yi-Chun Chen, Øvyind Frette, Børge Hamre, Andreas Steigen, Arne Dahlback, and Jakob J. Stamnes  »View Author Affiliations


Applied Optics, Vol. 53, Issue 14, pp. 2964-2973 (2014)
http://dx.doi.org/10.1364/AO.53.002964


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Abstract

Aerosols affect the climate directly through absorption and reflection of sunlight back to space and indirectly by acting as cloud condensation nuclei. This paper is based on more than three decades of satellite data (1979–1994 and 1996–2012) from total ozone mapping spectrometer (TOMS) and ozone monitoring instrument (OMI), which have provided measurements of backscattered radiances in the wavelength range from 331 to 380 nm. These data have been used to determine the aerosol climatology and to investigate the influence of the aerosol index (AI) on the ultraviolet index (UVI) in coastal land areas in Serrekunda (13.28°N, 16.34°W), The Gambia, and Dar-es-Salaam (6.8°S, 39.26°E), Tanzania, as well as in inland areas in Kampala (0.19°N, 32.34°E), Uganda. Heavy aerosol loadings were found to occur in the dry seasons at all three locations. To reduce the influence of clouds, we disregarded TOMS and OMI data for days during which the UV reflectivity was larger than 9% and investigated the correlation of the AI with the UVI for the remaining days at the three locations. We found a high correlation coefficient of 0.82 for Serrekunda, but poor correlation for Kampala and Dar-es-Salaam. The average AI for Serrekunda was found to be about three times higher than that for Kampala or Dar-es-Salaam, and a positive trend was found for the AI in Kampala and Dar-es-Salaam, whereas a negative trend was found for the AI in Serrekunda.

© 2014 Optical Society of America

OCIS Codes
(010.0010) Atmospheric and oceanic optics : Atmospheric and oceanic optics
(010.1100) Atmospheric and oceanic optics : Aerosol detection
(010.1110) Atmospheric and oceanic optics : Aerosols
(010.5620) Atmospheric and oceanic optics : Radiative transfer

ToC Category:
Atmospheric and Oceanic Optics

History
Original Manuscript: November 18, 2013
Revised Manuscript: March 27, 2014
Manuscript Accepted: March 30, 2014
Published: May 2, 2014

Virtual Issues
Vol. 9, Iss. 7 Virtual Journal for Biomedical Optics

Citation
Taddeo Ssenyonga, Dennis Muyimbwa, Willy Okullo, Yi-Chun Chen, Øvyind Frette, Børge Hamre, Andreas Steigen, Arne Dahlback, and Jakob J. Stamnes, "Aerosols in coastal and inland areas in the equatorial African belt," Appl. Opt. 53, 2964-2973 (2014)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-53-14-2964


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