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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 43, Iss. 29 — Oct. 10, 2004
  • pp: 5531–5541

Imaginary refractive-index effects on desert-aerosol extinction versus backscatter relationships at 351 nm: numerical computations and comparison with Raman lidar measurements

Maria Rita Perrone, Francesca Barnaba, Ferdinando De Tomasi, Gian Paolo Gobbi, and Anna Maria Tafuro  »View Author Affiliations


Applied Optics, Vol. 43, Issue 29, pp. 5531-5541 (2004)
http://dx.doi.org/10.1364/AO.43.005531


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Abstract

A numerical model is used to investigate the dependence at 351 nm of desert-aerosol extinction and backscatter coefficients on particle imaginary refractive index (m i ). Three ranges (-0.005 ≤ m i ≤ -0.001, -0.01 ≤ m i ≤ -0.001, and -0.02 ≤ m i ≤ -0.001) are considered, showing that backscatter coefficients are reduced as |m i | increases, whereas extinction coefficients are weakly dependent on m i . Numerical results are compared with extinction and backscatter coefficients retrieved by elastic Raman lidar measurements performed during Saharan dust storms over the Mediterranean Sea. The comparison indicates that a range of -0.01 to -0.001 can be representative of Saharan dust aerosols and that the nonsphericity of mineral particles must be considered.

© 2004 Optical Society of America

OCIS Codes
(010.1110) Atmospheric and oceanic optics : Aerosols
(010.3640) Atmospheric and oceanic optics : Lidar

History
Original Manuscript: February 27, 2004
Revised Manuscript: June 23, 2004
Published: October 10, 2004

Citation
Maria Rita Perrone, Francesca Barnaba, Ferdinando De Tomasi, Gian Paolo Gobbi, and Anna Maria Tafuro, "Imaginary refractive-index effects on desert-aerosol extinction versus backscatter relationships at 351 nm: numerical computations and comparison with Raman lidar measurements," Appl. Opt. 43, 5531-5541 (2004)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-43-29-5531

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