Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
19 Apr 2017
Review status
This discussion paper is under review for the journal Atmospheric Chemistry and Physics (ACP).
A high-resolution and observationally constrained OMI NO2 satellite retrieval
Daniel L. Goldberg1,2, Lok N. Lamsal3,4, Christopher P. Loughner5,6, Zifeng Lu1,2, and David G. Streets1,2 1Energy Systems Division, Argonne National Laboratory, Argonne, IL 60439, USA
2Computation Institute, University of Chicago, Chicago, IL 60637, USA
3Goddard Earth Sciences Technology and Research, Universities Space Research Association, Columbia, MD 21046, USA
4NASA Goddard Space Flight Center, Code 614, Greenbelt, MD 20771, USA
5NOAA Air Resources Laboratory, College Park, MD 20740, USA
6Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD 20740, USA
Abstract. This work presents a new high resolution NO2 dataset derived from the standard NASA Ozone Monitoring Instrument (OMI) NO2 version 3.0 retrieval that can be used to estimate surface level concentrations. The standard NASA product uses NO2 vertical profile shape factors from a 1.25° × 1° (~ 110 × 110 km) resolution Global Model Initiative (GMI) model simulation to calculate air mass factors, a critical value used to determine observed tropospheric NO2 vertical columns. To better estimate vertical profile shape factors, we use a high resolution Community Multi-scale Air Quality (CMAQ) model simulation (1.33 × 1.33 km) to generate tropospheric air mass factors and tropospheric NO2 columns during summertime in the eastern United States. Results show OMI NO2 tropospheric columns in this new product increase by up to 160 % in city centers, and decrease by 20–50 % in the rural areas outside of urban areas when compared to the operational product. This new product shows much better agreement with the Pandora NO2 spectrometer measurements acquired during the DISCOVER-AQ Maryland field campaign. Furthermore, the correlation between this satellite product and EPA NO2 monitors in urban areas has improved dramatically: r2 = 0.60 in new product, r2 = 0.39 in operational product, signifying that this new product is a better indicator of surface concentrations than the operational product. Our work emphasizes the need to use high resolution models to re-calculate satellite data in areas with large spatial heterogeneities in NOx emissions. Although the current work is focused on the eastern United States, the methodology developed in this work can be applied to other world regions to produce high-quality region-specific NO2 satellite retrievals.

Citation: Goldberg, D. L., Lamsal, L. N., Loughner, C. P., Lu, Z., and Streets, D. G.: A high-resolution and observationally constrained OMI NO2 satellite retrieval, Atmos. Chem. Phys. Discuss., doi:10.5194/acp-2017-219, in review, 2017.
Daniel L. Goldberg et al.
Daniel L. Goldberg et al.
Daniel L. Goldberg et al.


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Short summary
We developed a new satellite NO2 product using a high spatial resolution (1.33 × 1.33 km) model simulation constrained by aircraft observations. The re-calibrated satellite product is now able to see the spatial distribution of NO2 pollution over a large area with more clarity. The satellite is now in better agreement with monitors at ground level observing the same pollution.
We developed a new satellite NO2 product using a high spatial resolution (1.33 × 1.33 km) model...