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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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2016
Source: Geophysical Research Letters, 43(18), 9920-9930.
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Journal Title:Geophysical Research Letters
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NOAA Program & Office:
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Description: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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Source:Geophysical Research Letters, 43(18), 9920-9930.
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Rights Information:Other
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Compliance:Submitted
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Main Document Checksum:urn:sha256:05cfc21c9882b58bbef23bd3c0c128d3f2177349f699609e53f71314b44a978c
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