Dependence of megacity aerosol pollution estimates based on the atmospheric electric field strength on the unperturbed conductivity profile
Abstract
Ultrafine particles are very harmful to human health, so it is extremely important to develop indirect methods for estimating the concentration of aerosol particles with sizes up to 0.1 µm in diameter in atmosphere. Aerosol particles and the atmospheric electric field strength are tightly related with each other what allows the electric field usage for such estimates. The impossibility of in situ measurements of altitude dependencies, especially for the conductivity function, necessitates a study on the dependence of the results obtained on the specific profile taken. In this study, numerical estimates of the parameters of the model for estimating aerosol concentration in the air on the basis of electric field strength values for three conductivity profiles proposed from literature sources are used: a profile consisting of a single exponent, a profile consisting of three exponents, and a profile that well reflects the characteristics affecting the electric field of the surface layer atmosphere. It is shown that the use of two close profiles reflecting the altitudinal inhomogeneity of the conductivity profile gives almost indistinguishable results, however, a very different profile strongly changes the obtained estimates (the particle concentration in a megacity changes by almost an order of magnitude).
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