Articles | Volume 19, issue 13
https://doi.org/10.5194/acp-19-8863-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-19-8863-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
12 Jul 2019
Research article |
| 12 Jul 2019
| 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
Department of Earth and Planetary Sciences, Harvard University,
Cambridge, MA, USA
Daniel J. Jacob
Department of Earth and Planetary Sciences, Harvard University,
Cambridge, MA, USA
School of Engineering and Applied Sciences, Harvard University,
Cambridge, MA, USA
Loretta J. Mickley
School of Engineering and Applied Sciences, Harvard University,
Cambridge, MA, USA
Melissa P. Sulprizio
School of Engineering and Applied Sciences, Harvard University,
Cambridge, MA, USA
Katherine R. Travis
Department of Civil and Environmental Engineering, Massachusetts
Institute of Technology, Cambridge, MA, USA
now at: NASA Langley Research Center, Hampton, VA, USA
Eloise A. Marais
Department of Physics and Astronomy, University of Leicester,
Leicester, UK
Ronald C. Cohen
Department of Chemistry, University of California, Berkeley, CA, USA
Department of Earth and Planetary Science, University of California,
Berkeley, CA, USA
Joshua L. Laughner
Department of Chemistry, University of California, Berkeley, CA, USA
now at: Division of Geological and Planetary Sciences, California
Institute of Technology, Pasadena, CA, USA
Sungyeon Choi
Science Systems and Applications Inc., Lanham, MD, USA
Joanna Joiner
Science Systems and Applications Inc., Lanham, MD, USA
NASA Goddard Space Flight Center, Greenbelt, MD, USA
Lok N. Lamsal
NASA Goddard Space Flight Center, Greenbelt, MD, USA
Goddard Earth Sciences Technology and Research, Universities Space
Research Association, Columbia, MD, USA
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Short summary
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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