Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

IF value: 5.414
IF5.414
IF 5-year value: 5.958
IF 5-year
5.958
CiteScore value: 9.7
CiteScore
9.7
SNIP value: 1.517
SNIP1.517
IPP value: 5.61
IPP5.61
SJR value: 2.601
SJR2.601
Scimago H <br class='widget-line-break'>index value: 191
Scimago H
index
191
h5-index value: 89
h5-index89
Preprints
https://doi.org/10.5194/acp-2020-35
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-35
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  13 Feb 2020

13 Feb 2020

Review status
A revised version of this preprint is currently under review for the journal ACP.

Rainforest-like Atmospheric Chemistry in a Polluted Megacity

Mike J. Newland1, Daniel J. Bryant1, Rachel E. Dunmore1, Thomas J. Bannan2, W. Joe F. Acton3, Ben Langford4, James R. Hopkins1,5, Freya A. Squires1, William Dixon1, William S. Drysdale1, Peter D. Ivatt1, Mathew J. Evans1, Peter M. Edwards1, Lisa K. Whalley6,7, Dwayne E. Heard6,7, Eloise J. Slater6, Robert Woodward-Massey8, Chunxiang Ye8, Archit Mehra2, Stephen D. Worrall2,a, Asan Bacak2, Hugh Coe2, Carl J. Percival2,b, C. Nicholas Hewitt3, James D. Lee1,5, Tianqu Cui9, Jason D. Surratt9, Xinming Wang10, Alastair C. Lewis1,5, Andrew R. Rickard1,5, and Jacqueline F. Hamilton1 Mike J. Newland et al.
  • 1Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, UK
  • 2School of Earth and EnvironmentalSciences, The University of Manchester, Manchester, UK
  • 3Lancaster Environment Centre, Lancaster University, Lancaster, UK
  • 4Centre for Ecology and Hydrology, Edinburgh, EH26 0QB, UK
  • 5National Centre for Atmospheric Science (NCAS), University of York, York, UK
  • 6School of Chemistry, University of Leeds, Leeds, UK
  • 7National Centre for Atmospheric Science, School of Chemistry, University of Leeds, UK
  • 8Beijing Innovation Center for Engineering Science and Advanced Technology, State Key Joint Laboratory for Environmental Simulation and Pollution Control, Center for Environment and Health, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China
  • 9Department of Environmental Sciences and Engineering, Gillings School of Global Health, University of North Carolina, Chapel Hill, USA
  • 10Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China
  • anow at: Chemical Engineering and Applied Chemistry, School of Engineering and Applied Science, Aston University, Birmingham, UK
  • bnow at: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA, USA

Abstract. The impact of volatile organic compound (VOC) emissions to the atmosphere on the production of secondary pollutants, such as ozone and secondary organic aerosol (SOA), is mediated by the concentration of nitric oxide (NO). Polluted urban atmospheres are typically considered to be high-NO environments, while remote regions such as rainforests, with minimal anthropogenic influences, are considered to be low-NO. Policy to reduce urban air pollution is typically developed assuming that the chemistry is controlled by the high-NO regime. However, our observations from central Beijing show that this simplistic separation of regimes is flawed. Despite being in one of the largest megacities in the world, we observe significant formation of gas and aerosol phase oxidation products associated with the low-NO rainforest-like regime during the afternoon. This is caused by a surprisingly low concentration of NO, coupled with high concentrations of VOCs and of the atmospheric oxidant hydroxyl (OH). Box model calculations suggest that during the morning high-NO chemistry predominates (95 %) but in the afternoon low-NO chemistry plays a greater role (30 %). With increasing global emphasis on reducing air pollution, the modelling tools used to develop urban air quality policy need to adequately represent both high- and low-NO regimes if they are to have utility.

Mike J. Newland et al.

Interactive discussion

Status: final response (author comments only)
Status: final response (author comments only)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
[Login for Authors/Editors] [Subscribe to comment alert] Printer-friendly Version - Printer-friendly version Supplement - Supplement

Mike J. Newland et al.

Mike J. Newland et al.

Viewed

Total article views: 484 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
339 135 10 484 47 12 17
  • HTML: 339
  • PDF: 135
  • XML: 10
  • Total: 484
  • Supplement: 47
  • BibTeX: 12
  • EndNote: 17
Views and downloads (calculated since 13 Feb 2020)
Cumulative views and downloads (calculated since 13 Feb 2020)

Viewed (geographical distribution)

Total article views: 636 (including HTML, PDF, and XML) Thereof 626 with geography defined and 10 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 

Cited

Saved

No saved metrics found.

Discussed

No discussed metrics found.
Latest update: 22 Sep 2020
Publications Copernicus
Download
Short summary
We report the formation of secondary pollutants in the urban Megacity of Beijing that are typically associated with remote regions such as rainforests. This is caused by extremely low levels of nitric oxide (NO), typically expected to be high in urban areas, observed in the afternoon. This work has significant implications for how we understand atmospheric chemistry in the urban environment, and thus how to implement effective policies to improve urban air quality.
We report the formation of secondary pollutants in the urban Megacity of Beijing that are...
Citation
Altmetrics