Issues of Assessing Visibility Taking into Account the Effect of Humidified Aerosol and Air Temperature

Abstract

The article is devoted to the assessment of visibility, taking into account the influence of humidified aerosol and air temperature. It is well known that visibility depends on the optical properties of atmospheric components, the physical properties of the observed object, as well as the threshold visual contrast of the observer. The purpose of this article is to study the joint dependence of meteorological visibility on both relative humidity and air temperature. The scenario of meteorological measurements is considered when multistep measurements of the relative humidity index RH(T ) are carried out in the temperature range (T –T ) x x 0with an equal step. It is shown that, in order to achieve maximum information content of the measurements, the temperature T should be chosen so that RH(T ) is proportional to the value C (T –T ). Thus, the procedure for x 0 1 x 0multi-step visibility measurements in conditions of increasing air temperature over time is determined. According to the calculated regularity, at each step of measuring the newly introduced indicator, which is a shifted value of relative visibility, the temperature increment in the next step should be selected proportionally to the value of relative humidity in the current measurement step.