Using measurements of the GSA instrument onboard the Resurs-P satellite, the authors performed an experiment for the retrieval of the high-detailed spatial NO2 distribution in the troposphere. The authors developed an algorithm to obtain the tropospheric NO2 2D distribution with the horizontal spatial resolution reaching 2.4 km for the first time at the world level and provided on a grid with a step of 120 m. The high spatial resolution of the NO2 space measurements for the first time allowed the identification of local sources of NO2 pollution and their plumes. Earlier, we compared our large-scale NO2 distribution structures with measurements from another satellite instrument, OMI, and obtained a reasonable agreement between the NO2 fields taken by the two systems on September 29, 2016 for Hebei province, the North China Plain, which is the most NO2 polluted area in the world. For the validation of fine structures detected in the NO2 fields of GSA/Resurs-P, we are developing methods based on comparisons with numerical models. The paper presents preliminary results of comparisons of the GSA/Resurs-P tropospheric NO2 measurements with simulations performed by models describing the transport of impurities in the atmosphere with different accuracy.
The authors are developing methods for the determination of the emissions from urban sources of key impurities basing on surface and high-detailed satellite measurements. For the applications in these researches we develop a simplified parameterized model of chemical transformations in the atmosphere. This work is devoted to estimation of the effective lifetimes and the decay rates of nitrogen oxides (NOx) entering the atmosphere as a result of emissions of industrial enterprises basing on chemical-transport simulation. The estimation of effective decay rates, which allows to relatively simply parameterize chemical processes occurring in a plume, is necessary for further use in transport models based on systems of the diffusion-reaction-advection equations and describing the behavior of the plume. The effective decay rates are calculated as the inverse of the times over which the concentrations of the corresponding nitrogen oxides decrease by e times compared to their maximum values. The dependence of their concentrations on time is found by solving a system of kinetic equations describing the reactions occurring in the plume. For the numerical solution of the Cauchy problem, a finite-difference scheme is used that takes into account the structure of the kinetic equations and has the second order of the approximation error.