Articles | Volume 26, issue 3
https://doi.org/10.5194/acp-26-2353-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-26-2353-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
16 Feb 2026
Research article |
| 16 Feb 2026
| 16 Feb 2026
Aerosol iodine recycling is a major control on tropospheric reactive iodine abundance
Department of Atmospheric and Climate Science, University of Washington, Seattle, WA, United States
Leyang Liu
School of Energy and Environment, City University of Hong Kong, Hong Kong SAR, China
University of Hong Kong Shenzhen Research Institute, Shenzhen, China
Xuan Wang
School of Energy and Environment, City University of Hong Kong, Hong Kong SAR, China
University of Hong Kong Shenzhen Research Institute, Shenzhen, China
Yuk-Chun Chan
Department of Atmospheric and Climate Science, University of Washington, Seattle, WA, United States
Alyson Fritzmann
University of California Los Angeles Department of Atmospheric and Oceanic Sciences, Los Angeles, CA, United States
Ryan Pound
Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, UK
Amy Lees
Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, UK
Lewis Marden
Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, UK
Mat Evans
Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, UK
Lucy J. Carpenter
Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, UK
Jochen Stutz
University of California Los Angeles Department of Atmospheric and Oceanic Sciences, Los Angeles, CA, United States
Joel A. Thornton
Department of Atmospheric and Climate Science, University of Washington, Seattle, WA, United States
Gordon Novak
NOAA Chemical Sciences Laboratory, Boulder, CO, United States
Andrew Rollins
NOAA Chemical Sciences Laboratory, Boulder, CO, United States
Gregory P. Schill
NOAA Chemical Sciences Laboratory, Boulder, CO, United States
Xu-Cheng He
Institute for Atmospheric and Earth System Research/Physics, University of Helsinki, 00014 Helsinki, Finland
Henning Finkenzeller
Institute for Atmospheric and Earth System Research/Physics, University of Helsinki, 00014 Helsinki, Finland
Mago Reza
Department of Chemistry, University of Colorado Boulder, Boulder, CO, United States
Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado Boulder, Boulder, CO, United States
Rainer Volkamer
Department of Chemistry, University of Colorado Boulder, Boulder, CO, United States
Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado Boulder, Boulder, CO, United States
Kelvin H. Bates
Department of Mechanical Engineering, University of Colorado, Boulder, CO, United States
Alfonso Saiz-Lopez
Department of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Blas Cabrera, CSIC, Madrid, Spain
Anoop S. Mahajan
Centre for Climate Change Research, Indian Institute of Tropical Meteorology, Pune, India
Department of Atmospheric and Climate Science, University of Washington, Seattle, WA, United States
Data sets
Role of iodine oxoacids in atmospheric aerosol nucleation: data resources (Version v1) X.-C. He et al. https://doi.org/10.5281/zenodo.4299441
GV AMAX-DOAS Data. Version 5.0 R. Volkamer and B. Dix https://doi.org/10.26023/DJX0-85VQ-Q80X
Airborne Multi-AXis Differential Optical Absorption Spectroscopy (AMAX-DOAS) Data. Version 2.0 R. Volkamer et al. https://doi.org/10.5065/D6F769MF
ATom: Merged Atmospheric Chemistry, Trace Gases, and Aerosols, Version 2 (Version 2.0) S. C. Wofsy et al. https://doi.org/10.3334/ORNLDAAC/1925
Short summary
Global chemical transport models previously treated aerosols as a sink for reactive iodine (Iy); however, aerosol iodide is also a source of Iy via heterogeneous reactions involving hypohalous acids and halogen nitrates. We implemented this chemistry into GEOS-Chem, in addition to explicitly representing three aerosol iodine types: soluble organic iodine (SOI), iodide, and iodate. We found that aerosol recycling of iodide to form Iy is more than twice as fast as the other Iy sources combined.
Global chemical transport models previously treated aerosols as a sink for reactive iodine (Iy);...
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