Vol. 18, issue 11, article # 9

Abstract:

Data of remote (up to 3 km) measurements of NO₂ profiles in a strongly polluted atmosphere of industrial center of Tomsk city are presented, obtained with the use of designed correlation spectral device DAN-2 operating with reflected and scattered solar radiation at λ = 0.4 μm. A possibility of using the scattered solar radiation reflected from different surfaces, characteristic of urban landscapes (walls and roofs of buildings, plant chimneys, trees, etc.) as a reference calibrating signal for the device has been studied. The efficiency of using such calibrating signals and calibrating signals from the background solar radiation scattered in atmosphere was compared. It was found that diffusively scattering rough underlying surfaces are most efficient for calibration of the instrument. A possibility of the device operating and measuring concentrations, integral over the path, under conditions of heavy cloudiness has been demonstrated. Mean stationary NO₂ concentration was found to be 1-5 mg/m³ at the emission height within 100-200 m from the source and to depend weekly on the wind direction.