Preprints
https://doi.org/10.5194/gmd-2021-107
https://doi.org/10.5194/gmd-2021-107

Submitted as: model description paper 11 Jun 2021

Submitted as: model description paper | 11 Jun 2021

Review status: this preprint is currently under review for the journal GMD.

Iodine chemistry in the chemistry-climate model SOCOL-AERv2-iodine

Arseniy Karagodin-Doyennel1,2,, Eugene Rozanov1,2,3,, Timofei Sukhodolov1,2,3,, Tatiana Egorova2,, Alfonso Saiz-Lopez4, Carlos A. Cuevas4, Rafael P. Fernandez4,5, Tomás Sherwen6,7, Rainer Volkamer1,8,9,10, Theodore K. Koenig8,9, Tanguy Giroud1, and Thomas Peter1 Arseniy Karagodin-Doyennel et al.
  • 1The Institute for Atmospheric and Climate Science (IAC) ETH, Zurich, Switzerland
  • 2The Physikalisch-Meteorologisches Observatorium Davos/World Radiation Center (PMOD/WRC), Davos, Switzerland
  • 3Department of Physics of Earth, Faculty of Physics, Saint Petersburg State University, Saint Petersburg, Russia
  • 4Department of Atmospheric Chemistry and Climate, IQFR-CSIC, Spain
  • 5Institute for Interdisciplinary Science, National Research Council (ICB-CONICET), FCEN-UNCuyo, Mendoza, Argentina
  • 6National Centre for Atmospheric Science, University of York, York, YO10 5DD, UK
  • 7Wolfson Atmospheric Chemistry Laboratories, University of York, York, YO10 5DD, UK
  • 8Department of Chemistry, University of Colorado Boulder, Boulder, CO 80309
  • 9Cooperative Institute for Research in Environmental Sciences, Boulder, CO 80309
  • 10Laboratory of Radiochemistry and Environmental Chemistry, Paul Scherrer Institute, 5232 Villigen, Switzerland
  • These authors contributed equally to this work.

Abstract. This paper introduces a new version of the chemistry-climate model SOCOL-AERv2, supplemented by an iodine chemistry module. We conducted three twenty-year-long ensemble experiments to assess the validity of modeled iodine and to quantify the effects of iodine on ozone. The obtained iodine distributions with SOCOL-AERv2-iodine show good agreement with the CAM-chem model simulations and AMAX-DOAS observations. For the present-day atmosphere, the model suggests the strongest influence of iodine in the lower stratosphere with an ozone loss of up to 30 ppbv at low latitudes and up to 100 ppbv at high latitudes. Globally averaged, the model suggests iodine-induced chemistry to result in an ozone column reduction of 3–4 %, maximizing at high latitudes. In the troposphere, iodine chemistry lowers tropospheric ozone concentrations by 5–10 % depending on the geographical location. We also determined the sensitivity of ozone to iodine applying a 2-fold increase of iodine emissions, which reduces the ozone column globally by an additional 1.5–2.5 %. We found that in the lower troposphere, the share of ozone loss induced by iodine originating from inorganic sources is 75 % and 25 % by iodine originating from organic sources, and contributions become similar at about 50 hPa. These results constrain the importance of atmospheric iodine chemistry for present and future conditions, even though uncertainties remain high due to the paucity of observational data of iodine species.

Arseniy Karagodin-Doyennel et al.

Status: open (until 06 Aug 2021)

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Arseniy Karagodin-Doyennel et al.

Arseniy Karagodin-Doyennel et al.

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Short summary
Here, we present the iodine chemistry module in the SOCOL-AERv2 model. The obtained iodine distribution showed a good agreement when validated against other simulations and available observations. We also estimated the contribution of iodine to ozone loss in the case of present-day iodine emissions, the sensitivity of ozone to doubled iodine emissions, and when considering only organic or inorganic iodine sources. The new model can be used as a tool to further studies of iodine effect on ozone.