Experiments on high-detailed mapping of tropospheric NO2 using GSA/Resurs-P observations: results, validation with models and measurements, estimation of emission power

Experiments for the retrieval of the high-detailed spatial NO2 distribution in the troposphere using measurements of the GSA instrument onboard satellites of Resurs-P series were performed in 2016-2017. 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 allowed the identification of local sources of NO2 pollution and their plumes from space observations. To validate the fine structures detected in the NO2 fields of GSA/Resurs-P, we perform comparisons with chemical transport models. The paper presents preliminary results of a comparison with a new model which is based on a numerical-asymptotic approach. The comparison was performed for NO2 observations on September 29, 2016 over Hebei province, the North China Plain. We propose, in particular, a new efficient approach using this model to obtain estimates of emissions from local anthropogenic sources based on GSA/Resurs-P observational data. To validate the coarse structures in the GSA/Resurs-P NO2 field, in this paper, we perform comparisons of our data based on spectral imagery of Tokyo region, Japan, taken in March-April 2017 with observations of OMI/Aura and TROPOMI/Sentinel-5P. The comparison confirmed the reliability of the GSA NO2 fields in general.