Preprints
https://doi.org/10.5194/gmd-2021-35
https://doi.org/10.5194/gmd-2021-35

Submitted as: model description paper 11 Mar 2021

Submitted as: model description paper | 11 Mar 2021

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

Atmosphere-Ocean-Aerosol-Chemistry-Climate Model SOCOLv4.0: description and evaluation

Timofei Sukhodolov1,2,3, Tatiana Egorova1,2, Andrea Stenke2, William T. Ball4, Christina Brodowsky2, Gabriel Chiodo2,5, Aryeh Feinberg2,6,7, Marina Friedel2, Arseniy Karagodin-Doyennel1,2, Thomas Peter2, Sandro Vattioni2, and Eugene Rozanov1,2,3 Timofei Sukhodolov et al.
  • 1Physikalisch-Meteorologisches Observatorium Davos and World Radiation Center, Davos, Switzerland
  • 2Institute for Atmospheric and Climate Science, ETH Zurich, Zurich, Switzerland
  • 3St. Petersburg State University, St. Petersburg, Russia
  • 4Department of Geoscience and Remote Sensing, Faculty of Civil Engineering and Geosciences, TU Delft, Delft, the Netherlands
  • 5Department of Applied Physics and Applied Mathematics, Columbia University, New York (NY), USA
  • 6Institute of Biogeochemistry and Pollutant Dynamics, ETH Zurich, Zurich, Switzerland
  • 7Eawag, Swiss Federal Institute of Aquatic Science and Technology, Dübendorf, Switzerland

Abstract. This paper features the new Atmosphere-Ocean-Aerosol-Chemistry-Climate Model SOCOLv4.0 and its validation. The new model was built by interactively coupling the MPI-ESM1.2 Earth System Model (T63, L47) with the chemistry (99 species) and size-resolving (40 bins) sulfate aerosol microphysics modules from the Aerosol-Chemistry-Climate Model SOCOL-AERv2. We evaluate its performance against reanalysis products and observations of atmospheric circulation, temperature, and trace gases distribution, with a focus on stratospheric processes. We show that SOCOLv4.0 captures the low- and mid-latitude stratospheric ozone well in terms of the climatological state, variability and evolution. The model provides an accurate representation of climate change, showing a global surface warming trend consistent with observations as well as realistic cooling in the stratosphere caused by greenhouse gas emissions, although, as in previous model versions, a too fast residual circulation and exaggerated mixing in the surf zone are still present. The stratospheric sulfur budget for moderate volcanic activity is well represented by the model, albeit with slightly underestimated aerosol lifetime after major eruptions. The presence of the interactive ocean and a successful representation of recent climate and ozone layer trends make SOCOLv4.0 ideal for studies devoted to future ozone evolution and effects of greenhouse gases and ozone-destroying substances, as well as the evaluation of potential solar geoengineering measures through sulfur injections. Potential further model improvements could be to increase the vertical resolution, which is expected to allow better meridional transport in the stratosphere, as well as to update the photolysis calculation module and budget of mesospheric odd nitrogen. In summary, this paper demonstrates that SOCOLv4.0 is well suited for applications related to the stratospheric ozone and sulfate aerosol evolution, including its participation in ongoing and future model intercomparison projects.

Timofei Sukhodolov et al.

Status: open (until 06 May 2021)

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  • RC1: 'Comment on gmd-2021-35', Anonymous Referee #1, 23 Apr 2021 reply

Timofei Sukhodolov et al.

Model code and software

Atmosphere-Ocean-Aerosol-Chemistry-Climate Model SOCOLv4.0 code Sukhodolov et al. https://doi.org/10.5281/zenodo.4570622

Timofei Sukhodolov et al.

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Short summary
This paper features the new Atmosphere-Ocean-Aerosol-Chemistry-Climate Model SOCOLv4.0 and its validation. The model performance is evaluated against reanalysis products and observations of atmospheric circulation and trace gases distribution, with a focus on stratospheric processes. Although we identified some problems to be addressed in further model upgrades, we demonstrated that SOCOLv4.0 is already well suited for studies related to chemistry-climate-aerosol interactions.