Search from over 60,000 research works

Advanced Search

Measurements of traffic-dominated pollutant emissions in a Chinese megacity

[thumbnail of Open Access]
Preview
2020-acp-20-8737-2020-Freya.pdf - Published Version (6MB) | Preview
Available under license: Creative Commons Attribution
Add to AnyAdd to TwitterAdd to FacebookAdd to LinkedinAdd to PinterestAdd to Email

Squires, F. A. orcid id iconORCID: https://orcid.org/0000-0002-3364-4617, Nemitz, E. orcid id iconORCID: https://orcid.org/0000-0002-1765-6298, Langford, B., Wild, O. orcid id iconORCID: https://orcid.org/0000-0002-6227-7035, Drysdale, W. S. orcid id iconORCID: https://orcid.org/0000-0002-7114-7144, Acton, W. J. F., Fu, P. orcid id iconORCID: https://orcid.org/0000-0001-6249-2280, Grimmond, C. S. B. orcid id iconORCID: https://orcid.org/0000-0002-3166-9415, Hamilton, J. F., Hewitt, C. N. orcid id iconORCID: https://orcid.org/0000-0001-7973-2666, Hollaway, M. orcid id iconORCID: https://orcid.org/0000-0003-0386-2696, Kotthaus, S. orcid id iconORCID: https://orcid.org/0000-0002-4051-0705, Lee, J. orcid id iconORCID: https://orcid.org/0000-0001-5397-2872, Metzger, S. orcid id iconORCID: https://orcid.org/0000-0002-4201-852X, Pingintha-Durden, N., Shaw, M., Vaughan, A. R., Wang, X. orcid id iconORCID: https://orcid.org/0000-0002-1982-0928, Wu, R., Zhang, Q. and Zhang, Y. orcid id iconORCID: https://orcid.org/0000-0003-0614-2096 (2020) Measurements of traffic-dominated pollutant emissions in a Chinese megacity. Atmospheric Chemistry and Physics, 20 (14). pp. 8737-8761. ISSN 1680-7316 doi: 10.5194/acp-20-8737-2020

Abstract/Summary

Direct measurements of NOx, CO and aromatic volatile organic compound (VOC) (benzene, toluene, C2-benzenes and C3-benzenes) flux were made for a central area of Beijing using the eddy-covariance technique. Measurements were made during two intensive field campaigns in central Beijing as part of the Air Pollution and Human Health (APHH) project, the first in November–December 2016 and the second during May–June 2017, to contrast wintertime and summertime emission rates. There was little difference in the magnitude of NOx flux between the two seasons (mean NOx flux was 4.41 mg m−2 h−1 in the winter compared to 3.55 mg m−2 h−1in the summer). CO showed greater seasonal variation, with mean CO flux in the winter campaign (34.7 mg m−2 h−1) being over twice that of the summer campaign (15.2 mg m−2 h−1). Larger emissions of aromatic VOCs in summer were attributed to increased evaporation due to higher temperatures. The largest fluxes in NOx and CO generally occurred during the morning and evening rush hour periods, indicating a major traffic source with high midday emissions of CO, indicating an additional influence from cooking fuel. Measured NOx and CO fluxes were then compared to the MEIC 2013 emissions inventory, which was found to significantly overestimate emissions for this region,providing evidence that proxy-based emissions inventories have positive biases in urban centres. This first set of pollutant fluxes measured in Beijing provides an important benchmark of emissions from the city which can help to inform and evaluate current emissions inventories.

Altmetric Badge

Item Type Article
URI https://reading-clone.eprints-hosting.org/id/eprint/93373
Item Type Article
Refereed Yes
Divisions Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
Publisher Copernicus Publications
Download/View statistics View download statistics for this item

Downloads

Downloads per month over past year

University Staff: Request a correction | Centaur Editors: Update this record

Search Google Scholar