Articles | Volume 21, issue 18
Atmos. Chem. Phys., 21, 13973–13996, 2021
https://doi.org/10.5194/acp-21-13973-2021
Atmos. Chem. Phys., 21, 13973–13996, 2021
https://doi.org/10.5194/acp-21-13973-2021

Research article 21 Sep 2021

Research article | 21 Sep 2021

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

Xuan Wang et al.

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 %, NOx by 6 %, and OH by 4 %.
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