Analysis of long-term observations of NO<sub>x</sub> and CO in megacities and application to constraining emissions inventories

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

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

Birgit Hassler ^{1, 2} Brian C. Mcdonald ^{1, 2} Gregory J. Frost ¹ Agnes Borbon ³ David C. Carslaw ⁴ Kevin Civerolo ⁵ Claire Granier ^{1, 2, 6} Paul S. Monks ⁷ Sarah Monks ^{1, 2} David D. Parrish ^{1, 2} Ilana B. Pollack ^{8, 1, 2} Karen H. Rosenlof ¹ Thomas B. Ryerson ¹ Erika von Schneidemesser ⁹ Michael Trainer ¹

1 ESRL - NOAA Earth System Research Laboratory

2 CIRES - Cooperative Institute for Research in Environmental Sciences

3 LaMP - Laboratoire de météorologie physique

4 WACL - Wolfson Atmospheric Chemistry Laboratories

5 NY DEC - New York State Department of Environmental Conservation

6 TROPO - LATMOS

LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales

7 Department of Chemistry [Leicester]

8 Department of Atmospheric Science [Fort Collins]

9 IASS - Institute for Advanced Sustainability Studies [Potsdam]

Abstract : Long-term atmospheric NO_x/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 NO_x/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 NO_x/CO trends in the past half century. Differing NO_x/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 NO_x 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 NO_x/CO enhancement ratios, possibly contributing to these models' inability to accurately reproduce observed long-term changes in tropospheric ozone.

Keywords : chemistry-climate models megacities emissions inventories long-term trends

Document type :

Journal articles

Domain :

Physics [physics] / Physics [physics] / Atmospheric and Oceanic Physics [physics.ao-ph]

Environmental Sciences

Sciences of the Universe [physics] / Ocean, Atmosphere

Complete list of metadatas

https://hal-insu.archives-ouvertes.fr/insu-01371221
Contributor : Catherine Cardon <>
Submitted on : Saturday, September 24, 2016 - 6:54:31 PM
Last modification on : Wednesday, August 14, 2019 - 11:56:05 AM

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

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