On the Possibility of Eliminating the Influence of the Atmospheric Aerosol on the Result of Measuring Harmful Gases in the Atmosphere above the Industrial Zones


Atmospheric air is the most vulnerable object of the environment. Volatile components of oil and petroleum products, oxides of sulfur, nitrogen, and carbon, as well as the large number of aerosols formed during the combustion of oil waste, enter the atmosphere from the objects of the petrochemical plants. The need in the aerosol correction when performing solar photometric measurements of the concentration of harmful idle in the atmosphere above the industrial zones is shown in the article. It is noted that when using known aerosol correction methods, the power dependence of the optical thickness of the atmospheric aerosol on the wavelength of the performed measurements does not allow to make  accurate correction of its effect on the result of solar photometric measurements of the atmospheric idle in the visible range of the spectrum. Based on the well-known Angstrom formula for calculating the optical thickness of the atmospheric aerosol, the new method was developed for correcting the effect of atmospheric aerosol on the result of solar photometric measurements. According to the proposed method, the optical thickness of an atmospheric aerosol can be defined as a scalar weighted convolution of the values of the aerosol optical thickness at the wavelengths equidistant from the central wavelength of the studied gas absorption by the preset value. Looked for weight coefficients are calculated by solving the system of two formed equations. The first of these equations is formed by normalizing the sum of the entered weight coefficients equal to one, and the second-by the property of the Angstrom formula. The model example is given concerning calculation of the main used indices at the implementation of the proposed method. The values are estimated that are related to the weight coefficients of the optical thicknesses of the atmospheric aerosol on two wavelengths located on the left and right from the wavelength equal to 1μm.

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DOI: 10.24000/0409-2961-2020-3-7-11
Year: 2020
Issue num: March
Keywords : aerosol solar photometer optical thickness idle absorption spectru