Global tropospheric halogen (Cl, Br, I) chemistry and its impact on oxidants

Wang, Xuan; Jacob, Daniel J.; Downs, William; Zhai, Shuting; Zhu, Lei; Shah, Viral; Holmes, Christopher D.; Sherwen, Tomás; Alexander, Becky; Evans, Mathew J.; Eastham, Sebastian D.; Neuman, J. Andrew; Veres, Patrick R.; Koenig, Theodore K.; Volkamer, Rainer; Huey, L. Gregory; Bannan, Thomas J.; Percival, Carl J.; Lee, Ben H.; Thornton, Joel A.

doi:https://doi.org/10.5194/acp-21-13973-2021

Articles | Volume 21, issue 18

https://doi.org/10.5194/acp-21-13973-2021

© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-21-13973-2021

© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 21, issue 18

Research article

|

21 Sep 2021

Research article |

| 21 Sep 2021

Global tropospheric halogen (Cl, Br, I) chemistry and its impact on oxidants

Xuan Wang, Daniel J. Jacob, William Downs, Shuting Zhai, Lei Zhu, Viral Shah, Christopher D. Holmes, Tomás Sherwen, Becky Alexander, Mathew J. Evans, Sebastian D. Eastham, J. Andrew Neuman, Patrick R. Veres, Theodore K. Koenig, Rainer Volkamer, L. Gregory Huey, Thomas J. Bannan, Carl J. Percival, Ben H. Lee, and Joel A. Thornton

Supplement

https://doi.org/10.5194/acp-21-13973-2021-supplement

Data sets

ATom: L2 Measurements from the NOAA ToF Chemical Ionization Mass Spectrometer (CIMS) P. R. Veres, J. A. Neuman, and T. B. Ryerson https://doi.org/10.3334/ORNLDAAC/1745

UW-High Resolution Time of Flight Mass Spectrometer -- CIMS1. Version 1.1 UCAR/NCAR - Earth Observing Laboratory https://doi.org/10.5065/D6RF5S6B

Airborne Multi-AXis Differential Optical Absorption Spectroscopy (AMAX-DOAS) Data R. Volkamer, T. Koenig, S. Baidar, and B. Dix https://doi.org/10.5065/D6F769MF

Georgia Tech Chemical Ionization Mass Spectrometer (GTCIMS) Bromine In Situ Measurements, Version 3.0 L. Huey https://doi.org/10.5065/D6DV1GW3

GV AMAX-DOAS Data, Version 5.0 R. Volkamer and B. Dix https://data.eol.ucar.edu/dataset/352.082

FAAM B826 CAST flight, number 3: Airborne atmospheric measurements from core and non-core instrument suites on board the BAE-146 aircraft Facility for Airborne Atmospheric Measurements, Natural Environment Research Council, Met Office https://catalogue.ceda.ac.uk/uuid/565b6bb5a0535b438ad2fae4c852e1b3

Model code and software

geoschem/geos-chem: GEOS-Chem 12.9.0 (12.9.0) B. Yantosca, M. Sulprizio, L. Lundgren, kelvinhb, 22degrees, D. Ridley, S. D. Eastham, R. Pound, T. Sherwen, H. Lin, J. Fisher, W. Downs, C. Thackray, michael-s-long, C. Holmes, GanLuo, J. Zhuang, SpaceMouse, L. Bindle, L. Murray, noelleselin, xin-chen-github, emily-ramnarine, gianga, L. Zhu, F. Yao, C. Fite, S. Song, and zsx-GitHuband ayhwong https://doi.org/10.5281/zenodo.3950327

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Short summary

Halogen radicals have a broad range of implications for tropospheric chemistry, air quality, and climate. We present a new mechanistic description and comprehensive simulation of tropospheric halogens in a global 3-D model and compare the model results with surface and aircraft measurements. We find that halogen chemistry decreases the global tropospheric burden of ozone by 11 %, NO_x by 6 %, and OH by 4 %.