The influence of the wind regime on the methanol concentration change in the atmospheric air of the city residential area

Abstract

The influence of the wind regime on the methanol concentration in the city residential area, which is released into the atmosphere as a result of the petrochemical enterprise, is analyzed. The initial data are the data obtained by the automatic atmospheric air control station (AAACS). There are the time series of the methanol concentration changes, the speed and angle of the wind direction for 3 years. The analysis of methanol concentration changes in the air of a settlement depending on the wind regime was carried out. It was revealed that the quality of atmospheric air in the residential area deteriorates with the north, east and south-west wind directions. Three-dimensional diagrams were built. They display the change in the methanol concentration in the atmospheric air depending on two parameters: wind direction and speed. It was found that at a wind speed of 1-2 m /s increase the air methanol concentration in the zone of population compact residence. The ways of methanol intake into the atmospheric air at dangerous wind directions have been determined. It has been established that an increase of the atmospheric air methanol concentration is due to the following reasons: the emission of a polluted gas mixture by a petrochemical enterprise, mechanical turbulence due to the high roughness of the underlying surface, the accumulation of pollutants over a reduced pressure area, in particular, over water bodies.