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Direct observation of changing NO_x lifetime in North American cities

Laughner, Joshua L. and Cohen, Ronald C. (2019) Direct observation of changing NO_x lifetime in North American cities. Science, 366 (6466). pp. 723-727. ISSN 0036-8075. doi:10.1126/science.aax6832.

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NO_x lifetime relates nonlinearly to its own concentration; therefore, by observing how NO_x lifetime changes with changes in its concentration, inferences can be made about the dominant chemistry occurring in an urban plume. We used satellite observations of NO₂ from a new high-resolution product to show that NOx lifetime in approximately 30 North American cities has changed between 2005 and 2014 in a manner consistent with our understanding of NO_x chemistry.

Item Type:Article
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URLURL TypeDescription Materials
Laughner, Joshua L.0000-0002-8599-4555
Cohen, Ronald C.0000-0001-6617-7691
Alternate Title:Direct observation of changing NOx lifetime in North American cities
Additional Information:© 2019 American Association for the Advancement of Science. This is an article distributed under the terms of the Science Journals Default License. Received 13 April 2019; accepted 9 October 2019. The authors thank P. Romer for assistance with the steady-state model used to generate Fig. 1. Funding: This work was supported by a NASA ESS Fellowship (NNX14AK89H), NASA grant NNX15AE37G, and the TEMPO project (SV3-83019). This work used the Cheyenne high-performance computing cluster (doi:10.5065/D6RX99HX) provided by NCAR’s Computational and Information Systems Laboratory, sponsored by the National Science Foundation. This research also used the Savio computational cluster resource provided by the Berkeley Research Computing program at the University of California, Berkeley (supported by the University of California, Berkeley, chancellor, vice chancellor for research, and chief information officer). Author contributions: R.C.C. and J.L.L. jointly conceived the study, and J.L.L. executed it. The authors declare no competing interests. Data and materials availability: The BEHR product (13) is freely available. The code used in this work is available at (23), and intermediate data (line densities and fits) are available at (24).
Funding AgencyGrant Number
NASA Earth and Space Science FellowshipNNX14AK89H
Smithsonian Astrophysical ObservatorySV3-83019
Issue or Number:6466
Record Number:CaltechAUTHORS:20191107-125823204
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Official Citation:Direct observation of changing NOx lifetime in North American cities. BY JOSHUA L. LAUGHNER, RONALD C. COHEN. SCIENCE 08 NOV 2019: 723-727.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:99738
Deposited By: Tony Diaz
Deposited On:07 Nov 2019 21:31
Last Modified:16 Nov 2021 17:48

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