Articles | Volume 20, issue 21
https://doi.org/10.5194/acp-20-12905-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/acp-20-12905-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
05 Nov 2020
Research article |
| 05 Nov 2020
| 05 Nov 2020
Trends in global tropospheric hydroxyl radical and methane lifetime since 1850 from AerChemMIP
David S. Stevenson
CORRESPONDING AUTHOR
School of GeoSciences, The University of Edinburgh, EH9 3FF, UK
Alcide Zhao
School of GeoSciences, The University of Edinburgh, EH9 3FF, UK
Department of Meteorology, University of Reading, UK
National Centre for Atmospheric Science, University of Reading, UK
Vaishali Naik
National Oceanic and Atmospheric Administration (NOAA), Geophysical Fluid Dynamics Laboratory (GFDL), Princeton, NJ 08540, USA
Fiona M. O'Connor
Met Office Hadley Centre, Exeter, UK
Simone Tilmes
Atmospheric Chemistry Observations and Modeling Laboratory, National
Center for Atmospheric Research, Boulder, CO, USA
Guang Zeng
National Institute of Water and Atmospheric Research (NIWA),
Wellington, New Zealand
Lee T. Murray
Department of Earth and Environmental Sciences, University of
Rochester, Rochester, NY, USA
William J. Collins
Department of Meteorology, University of Reading, UK
Paul T. Griffiths
National Centre for Atmospheric Science, University of Cambridge,
UK
Department of Chemistry, University of Cambridge, UK
Sungbo Shim
National Institute of Meteorological Sciences, Seogwipo-si,
Jeju-do, Korea
Larry W. Horowitz
National Oceanic and Atmospheric Administration (NOAA), Geophysical Fluid Dynamics Laboratory (GFDL), Princeton, NJ 08540, USA
Lori T. Sentman
National Oceanic and Atmospheric Administration (NOAA), Geophysical Fluid Dynamics Laboratory (GFDL), Princeton, NJ 08540, USA
Louisa Emmons
Atmospheric Chemistry Observations and Modeling Laboratory, National
Center for Atmospheric Research, Boulder, CO, USA
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Latest update: 27 Nov 2023
Short summary
We present historical trends in atmospheric oxidizing capacity (OC) since 1850 from the latest generation of global climate models and compare these with estimates from measurements. OC controls levels of many key reactive gases, including methane (CH4). We find small model trends up to 1980, then increases of about 9 % up to 2014, disagreeing with (uncertain) measurement-based trends. Major drivers of OC trends are emissions of CH4, NOx, and CO; these will be important for future CH4 trends.
We present historical trends in atmospheric oxidizing capacity (OC) since 1850 from the latest...
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