On the Measurement of Liquid Water in Fogs & Clouds below 0°C

Abstract

1. Applying the fact that the collection efficicncy of a thin wire is nearly equal to unity, the author has made a simple apparatus for measuring the content of the supercooled fog water, which is essentially a circular wire-netting mounted in front of a hand-anemometer.
2. Measuring the weight of the ice deposit on wire and the wind course in an adequate time interval, the water content may be easily obtamed.
3. By careful treatment of the apparatus, the error can be held less than 10%.
4. Most of the observed water content in mountain upslope fog are less than 0.5gr. per m³ at the temperature 0°C_??_-10°C.
5. The observed data have been discussed in relation, to the problem of visibiiity in fog, and as the constant of the Trabert's formula the value 2.1 has been obtained, which is about one third of the Köhler's result.
6. The effect of the intermixed ice particles on visibility appears to be rather small.