Extinction coefficients and phase functions of particle size distributions measured inside cloud layers

Karin Weiss-Wrana; Anton Kohnle

doi:10.1117/12.221059

Abstract

The vertical structure of the atmospheric aerosols was investigated during cable car ascents along a steep mountain slope in the German Alps. Aerosol size distributions were measured by operating two particle spectrometer probes with diameter ranges of 0.15-3 micrometers and 1-95 micrometers . Aerosol and hydrometeorits were sampled under the meteorological conditions of clear atmosphere, haze, and thick clouds. For each atmospheric layer the phase function P((theta) ) and the extinction coefficient (sigma) _ext were calculated for the visual ((lambda) equals 0.55 micrometers ), the near IR with Nd:YAG laser radiation ((lambda) equals 1.064 micrometers ) and iodine laser radiation ((lambda) equals 1.315 micrometers ) and the middle IR with CO₂ laser radiation ((lambda) equals 10.59 micrometers ) using the computer code AGAUS of the EOSAEL program library of the US Army Research Laboratory. In the visual and the near IR the aerosol extinction coefficient is not sensitive to variations of the complex refractive index. However, for the CO₂ laser radiation, the uncertainty in the values of optical constants causes large deviations in calculated aerosol extinction coefficients.

Citation Download Citation

Karin Weiss-Wrana, Karin Weiss-Wrana, Anton Kohnle, Anton Kohnle, } "Extinction coefficients and phase functions of particle size distributions measured inside cloud layers", Proc. SPIE 2506, Air Pollution and Visibility Measurements, (20 September 1995); doi: 10.1117/12.221059; https://doi.org/10.1117/12.221059

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