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ACP | Articles | Volume 19, issue 13
Atmos. Chem. Phys., 19, 8863–8878, 2019
https://doi.org/10.5194/acp-19-8863-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
Atmos. Chem. Phys., 19, 8863–8878, 2019
https://doi.org/10.5194/acp-19-8863-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 12 Jul 2019

Research article | 12 Jul 2019

Using satellite observations of tropospheric NO2 columns to infer long-term trends in US NOx emissions: the importance of accounting for the free tropospheric NO2 background

Rachel F. Silvern et al.

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Cited articles

Air Sciences: 2002 Fire Emission Inventory for the WRAP Region – Phase II, Denver and Portland, 2005. 
Amedro, D., Bunkan, A. J. C., Berasategui, M., and Crowley, J. N.: Kinetics of the OH+NO2 reaction: Rate coefficients (217–333 K, 16–1200 mbar) and fall-off parameters for N2 and O2 bath-gases, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-297, in review, 2019. 
Anderson, D. C., Loughner, C. P., Diskin, G., Weinheimer, A., Canty, T. P., Salawitch, R. J., Worden, H. M., Fried, A., Mikoviny, T., Wisthaler, A., and Dickerson, R. R.: Measured and modeled CO and NOy in DISCOVER-AQ: An evaluation of emissions and chemistry over the eastern US, Atmos. Environ., 96, 78–87, https://doi.org/10.1016/j.atmosenv.2014.07.004, 2014. 
Anderson, J. G., Weisenstein, D. K., Bowman, K. P., Homeyer, C. R., Smith, J. B., Wilmouth, D. M., Sayres, D. S., Klobas, J. E., Leroy, S. S., Dykema, J. A., and Wofsy, S. C.: Stratospheric ozone over the United States in summer linked to observations of convection and temperature via chlorine and bromine catalysis, P. Natl. Acad. Sci. USA, 114, E4905–E4913, https://doi.org/10.1073/pnas.1619318114, 2017. 
Anderson, J. G., Clapp, C. E., Bowman, K. P., Homeyer, C. R., Weisenstein, D. K., Smith, J. B., Wilmouth, D. M., and Klobas, J. E.: Coupling Free Radical Catalysis, Convective Injection into the Stratosphere, Climate Forcing, and Human Health, AMS Annual Meeting, Phoenix, AZ, 2019. 
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The US EPA reports a steady decrease in nitrogen oxide (NOx) emissions from fuel combustion over the 2005–2017 period, while satellite observations show a leveling off after 2009, suggesting emission reductions and related air quality gains have halted. We show the sustained decrease in NOx emissions is in fact consistent with observed trends in surface NO2 and ozone concentrations and that the flattening of the satellite trend reflects a growing influence from the non-anthropogenic background.
The US EPA reports a steady decrease in nitrogen oxide (NOx) emissions from fuel combustion over...
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