An Analysis of Infrared and Visible Atmospheric Extinction Measurements in Europe
SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA VISIBILITY LAB
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This report discusses an analysis of infrared 3-5 and 8-12 micrometers and visible extinctions recorded in the Netherlands over three 3- month seasons. The data, recorded at hourly intervals during this period, were gathered as a part of the OPAQUE program. They are preliminary releases data. It was found that the infrared aerosol extinctions could effectively be sorted into a clear to haze category and a mist to fog category. Two observations were required to determine the appropriate category the visual extinction and the relative humidity. The use of either parameter alone yielded a much less effective categorization. As a result of this work, one may suggest two primary future avenues of investigation. First, interrogate the remaining OPAQUE data to determine the distribution and persistence of the infrared aerosol extinctions in the mist at other locations. Secondly, begin an experimental study to determine the feasibility of detecting large water droplet formation and thus the high infrared aerosol extinctions using measurements such as bluered scattering ratios. The experimental approach would be to explore measurement techniques which are operationally feasible and which are theoretically expected to be effective in detecting large water droplet formation and thus high infrared aerosol extinctions.