FOG DROPLET GROWTH AND PRECIPITATION-RATE MEASUREMENTS WITH AN ULTRA-VIOLET WAVELENGTH TRANSMISSOMETER.
BOLLAY (E) ASSOCIATES INC SANTA BARBARA CALIF
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This report describes measurements of radiation fog droplet growth and precipitation-rate. The instrument used was an ultra-violet wavelength transmissometer developed previously by the Federal Aviation Agency as part of its research activities in airfield instrumentation. Measurements were made at Portland Oregon International Airport in FY66 and Corvallis, Oregon in FY67. The fog droplet growth measurements were inconclusive, apparently because of an invariance in the .1 to 1.0 micrometers droplet size spectrum as radiation fog forms in continuously saturated air. Precipitation-rate power spectra are found to be similar to those obtained with conventional rain-rate gage data. Author