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Title: Analysis of long-term observations of NO<inf>x</inf> and CO in megacities and application to constraining emissions inventories
Authors: Hassler, B.
McDonald, B. C.
Frost, G. J.
Borbon, A.
Carslaw, D. C.
Civerolo, K.
Granier, C.
Monks, Paul S.
Monks, S.
Parrish, D. D.
Pollack, I. B.
Rosenlof, K. H.
Ryerson, T. B.
von Schneidemesser, E.
Trainer, M.
First Published: 22-Sep-2016
Publisher: American Geophysical Union (AGU), Wiley
Citation: Geophysical Research Letters, 2016, 43 (18), pp. 9920-9930
Abstract: Long-term atmospheric NOx/CO enhancement ratios in megacities provide evaluations of emission inventories. A fuel-based emission inventory approach that diverges from conventional bottom-up inventory methods explains 1970–2015 trends in NOx/CO enhancement ratios in Los Angeles. Combining this comparison with similar measurements in other U.S. cities demonstrates that motor vehicle emissions controls were largely responsible for U.S. urban NOx/CO trends in the past half century. Differing NOx/CO enhancement ratio trends in U.S. and European cities over the past 25 years highlights alternative strategies for mitigating transportation emissions, reflecting Europe's increased use of light-duty diesel vehicles and correspondingly slower decreases in NOx emissions compared to the U.S. A global inventory widely used by global chemistry models fails to capture these long-term trends and regional differences in U.S. and Europe megacity NOx/CO enhancement ratios, possibly contributing to these models' inability to accurately reproduce observed long-term changes in tropospheric ozone.
DOI Link: 10.1002/2016GL069894
ISSN: 0094-8276
eISSN: 1944-8007
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Archived with reference to SHERPA/RoMEO and publisher website.
Appears in Collections:Published Articles, Dept. of Chemistry

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