Analysis of long-term observations of NOx and CO in megacities and application to constraining emissions inventories

Hassler, Birgit; McDonald, Brian C.; Frost, Gregory J.; Borbon, Agnes; Carslaw, David C.; Civerolo, Kevin; Granier, Claire; Monks, Paul S.; Monks, Sarah; Parrish, David D.; Pollack, Ilana B.; Rosenlof, Karen H.; Ryerson, Thomas B.; von Schneidemesser, Erika; Trainer, Michael

doi:10.1002/2016gl069894

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Analysis of long-term observations of NOx and CO in megacities and application to constraining emissions inventories

2016
By Hassler, Birgit ; McDonald, Brian C. ; Frost, Gregory J. ; ...
Source: Geophysical Research Letters, 43(18), 9920-9930.

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Journal Title:

Geophysical Research Letters
Personal Author:

Hassler, Birgit ; McDonald, Brian C. ; Frost, Gregory J. ; Borbon, Agnes ; Carslaw, David C. ; ... More +

Hassler, Birgit ; McDonald, Brian C. ; Frost, Gregory J. ; Borbon, Agnes ; Carslaw, David C. ; Civerolo, Kevin ; Granier, Claire ; Monks, Paul S. ; Monks, Sarah ; Parrish, David D. ; Pollack, Ilana B. ; Rosenlof, Karen H. ; Ryerson, Thomas B. ; von Schneidemesser, Erika ; Trainer, Michael Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; ESRL (Earth System Research Laboratory) ; CIRES (Cooperative Institute for Research in Environmental Sciences)

OAR (Oceanic and Atmospheric Research) ; ESRL (Earth System Research Laboratory) ; CIRES (Cooperative Institute for Research in Environmental Sciences) Less -
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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.
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Geophysical Research Letters, 43(18), 9920-9930.
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https://doi.org/10.1002/2016gl069894
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urn:sha256:05cfc21c9882b58bbef23bd3c0c128d3f2177349f699609e53f71314b44a978c
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Analysis of long-term observations of NOx and CO in megacities and application to constraining emissions inventories

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