Abstract

The classical Ångström exponent is an operationally robust optical parameter that contains size information on all optically active aerosols in the field of view of a sunphotometer. Assuming that the optical effects of a typical (radius) size distribution can be approximated by separate submicrometer and supermicrometer components, we show that one can exploit the spectral curvature information in the measured optical depth to permit a direct estimation of a fine-mode (submicrometer) Ångström exponent (α_f) as well as the optical fraction of fine-mode particles (η). Simple expressions that enable the estimation of these parameters are presented and tested by use of simulations and measurements.

© 2001 Optical Society of America

Retrievals of aerosol optical depth and Ångström exponent from ground-based Sun-photometer data of Singapore

Santo V. Salinas, Boon N. Chew, and Soo C. Liew
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Dual-wavelength Mie-scattering Scheimpflug lidar system developed for the studies of the aerosol extinction coefficient and the Ångström exponent

Liang Mei, Zheng Kong, and Teng Ma
Opt. Express 26(24) 31942-31956 (2018)

Aerosol optical properties and precipitable water vapor column in the atmosphere of Norway

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Appl. Opt. 54(6) 1505-1514 (2015)

Characterization of aerosol optical properties using multiple clustering techniques over Zanjan, Iran, during 2010–2013

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Appl. Opt. 57(11) 2881-2889 (2018)

Aerosol optical properties in Northern Norway and Svalbard

Yi-Chun Chen, Børge Hamre, Øyvind Frette, Dennis Muyimbwa, Sandra Blindheim, Kerstin Stebel, Piotr Sobolewski, Carlos Toledano, and Jakob J. Stamnes
Appl. Opt. 55(4) 660-672 (2016)