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Lidar observations of arctic haze

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Abstract

In the study of the arctic haze phenomenon, one of the most elusive parameters and one crucial to understanding haze transport climatology is the vertical structure of the haze aerosol. There is also considerable question as to the representativeness of surface observations of arctic haze. Due to the strongly stratified nature of the arctic troposphere, it is necessary to define the mechanisms which transport aerosol to the surface from the transport altitudes of the lower troposphere. To examine these questions, a Mìe scattering lidar was installed at Alert from Sept. 1984 to Mar. 1985. The lidar observes atmospheric aerosols and hydrometeors as they appear in nature, unmodified by sampling effects. As such the results are more realistic of the light-scattering characteristics of the in situ aerosol than are those obtained by integrating nephelometers, for example, which heat the aerosol and dry it before measurement. With this lidar, a pulse (694.3 nm at 0.5-J output energy) was transmitted vertically through an evacuated tube in the roof of a building at Alert. The receiver consisted of a 20-cm diam Fresnel telescope, neutral density, and polarizing filters, an RCA C31000A PMT, Analog Modules LA-90-P logarithmic amplifier, and a LeCroy TR8827 32-MHz digitizer. Data were recorded on a Compaq Plus portable PC.

© 1986 Optical Society of America

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