Comparison of space high-detailed experimental and model data on tropospheric NO2 distribution

Abstract

In 2016 the authors performed space experiments to obtain the tropospheric NO2 field with the horizontal spatial resolution for the first time at the world level reaching 2.4 km. The NO2 fields were restored based on spectral measurements of GSA instrument installed on board the Russian satellites of the Resurs-P series. For the first time, the high spatial resolution of the new method makes it possible to identify local sources of NO2 pollution and their plumes. Good agreement with OMI NO2 observations with resolution 13 km x 24 km confirmed the reliability of the obtained Resurs-P NO2 fields in general. For the validation of high-detailed structures detected in the NO2 fields of GSA/Resurs-P, we are developing methods based on comparisons with chemical transport models. The comparison is performed for Hebei province, the North China Plain, which is the most NO2 polluted area in the world, using Resurs-P data obtained on September 29, 2016. The paper presents preliminary comparison of the Resurs-P tropospheric NO2 field with simulation based on HYSPLIT transport model. For the solution of the problem a high-detailed chemical transport model based on a solution of the nonlinear heat and mass transfer equation is under development. A theoretical background of the methods of asymptotic analysis of multidimensional singularly perturbed problems for the nonlinear heat and mass transfer equation is proposed.