Measurements of Visual Range and Radiation-Fog (Haze) Microphysics

Michael B. Meyer Atmospheric Sciences Research Center, State University of New York, Albany NY 12222

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James E. Jiusto Atmospheric Sciences Research Center, State University of New York, Albany NY 12222

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G. Garland Lala Atmospheric Sciences Research Center, State University of New York, Albany NY 12222

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Abstract

An extensive boundary-layer field program was conducted which included simultaneous measurements of visibility and particle size distributions during fog and haze. Several empirical expressions relating changes in visibility to characteristics of the aerosol (droplet) size spectrum and relative humidity are presented and evaluated. Detailed analysis of one evolving dense fog revealed several points of interest regarding the behavior of drop size spectra, including a scheme for approximating fog supersaturation.

Abstract

An extensive boundary-layer field program was conducted which included simultaneous measurements of visibility and particle size distributions during fog and haze. Several empirical expressions relating changes in visibility to characteristics of the aerosol (droplet) size spectrum and relative humidity are presented and evaluated. Detailed analysis of one evolving dense fog revealed several points of interest regarding the behavior of drop size spectra, including a scheme for approximating fog supersaturation.

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