Slant Path Low Visibility Atmospheric Conditions.
Abstract
A slant transmission path for measuring the quality of light transmission in the visible (0.35 to 0.90 micron) and thermal (1.25 to 12.75 micron) window has been installed. Transmitters are located at 1650 m a.s.1. on a mountain peak, receivers at the valley institute where the signals (lower limit < 0, 1% transmission) are processed. Direct distance is 2.7 km, inclination of the path against horizon 19 deg. The following quantities are recorded at the mountain and also at the valley station: Precipitation rate, temperature, humidity, aerosol particle spectrum from 0.4 to 20 micron 0, and visibility. Profiles of temperature and humidity are recorded by sondes on one of the gondolas of a nearby cable car or by small radiosondes. Aerosol backscatter between valley and mountain station is recorded by a multi-frequency slant lidar (347 nm, 530 nm, and 694 nm, in near future also 1060 nm). This system serves to study in the course of measuring campaigns the dependence of light transmission on the meteorological situation (fog, precipitation, humidity) and on aerosol conditions mainly during moderate to strong haze or mist, as well as generally on the air mass type, particularly in cases of vertical inhomogeneity (layer structures).
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1980
- Accession Number
- ADA096341
Entities
People
- Reinhold Reiter
- Rudolf Sladkovic
- Walter Carnuth
- Werner Funk