Articles | Volume 9, issue 3
https://doi.org/10.5194/gmd-9-1111-2016
https://doi.org/10.5194/gmd-9-1111-2016
Development and technical paper
 | 
22 Mar 2016
Development and technical paper |  | 22 Mar 2016

OMI NO2 column densities over North American urban cities: the effect of satellite footprint resolution

Hyun Cheol Kim, Pius Lee, Laura Judd, Li Pan, and Barry Lefer

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Short summary
Fair comparison between satellite- and modeled urban NO2 column densities is important in emission inventory evaluation and regulation policy making. This study focuses on the impact of satellite footprint resolution geometry. Since OMI NO2 pixels are too coarse to resolve fine-scale urban plumes, it may cause 20–30 % bias over major cities. We introduce approaches to adjust spatial and vertical structure (downscaling & averaging kernel), and demonstrate improved agreement between sat. and model.