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

作者：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

来源：Geophysical Research Letters, 2016, 43(18): 9920-9930.

DOI：10.1002/2016GL069894

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.

• 出版日期2016-9-28