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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editor: Gregory W. Faris
  • Vol. 4, Iss. 5 — May. 5, 2009

Evolution of the optical properties of biomass-burning aerosol during the 2003 southeast Australian bushfires

Majed Radhi, Michael A. Box, Gail P. Box, Pawan Gupta, and Sundar A. Christopher  »View Author Affiliations

Applied Optics, Vol. 48, Issue 9, pp. 1764-1773 (2009)

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During January and February 2003, drought conditions led to major bushfires across southeast Australia, causing considerable damage. We have examined aerosol optical depth (AOD) data recorded by a sunphotometer at Wagga Wagga. Although this site lies to the northeast of the fires, periodic changes in wind direction brought smoke plumes over our instrument (AOD in excess of 1.0), sometimes via circuitous routes. By examining the hourly AOD spectra and, specifically, the Ångstrom exponent derived from our two shortest wavelengths, we have observed clear evidence of a shift in the peak radius of the fine mode, most likely as a result of particle coagulation. Selected data sets were inverted to obtain the aerosol size distribution, confirming this conclusion. This was particularly clear on 25 January, when the wind changed during the day so that the afternoon observations were of smoke that had traveled on a more circuitous route to the north of Wagga Wagga before returning.

© 2009 Optical Society of America

OCIS Codes
(010.1110) Atmospheric and oceanic optics : Aerosols
(010.1310) Atmospheric and oceanic optics : Atmospheric scattering
(010.5630) Atmospheric and oceanic optics : Radiometry
(010.0280) Atmospheric and oceanic optics : Remote sensing and sensors

ToC Category:
Atmospheric and Oceanic Optics

Original Manuscript: July 3, 2008
Revised Manuscript: November 12, 2008
Manuscript Accepted: February 25, 2009
Published: March 17, 2009

Virtual Issues
Vol. 4, Iss. 5 Virtual Journal for Biomedical Optics

Majed Radhi, Michael A. Box, Gail P. Box, Pawan Gupta, and Sundar A. Christopher, "Evolution of the optical properties of biomass-burning aerosol during the 2003 southeast Australian bushfires," Appl. Opt. 48, 1764-1773 (2009)

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