Submitted as: model evaluation paper 29 Sep 2021

Submitted as: model evaluation paper | 29 Sep 2021

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

Simulation of organics in the atmosphere: evaluation of EMACv2.54 with the Mainz Organic Mechanism (MOM) coupled to the ORACLE (v1.0) submodel

Andrea Pozzer1, Simon Reifenberg1, Vinod Kumar1, Bruno Franco2, Domenico Taraborrelli3, Sergy Gromov1, Sebastian Ehrhart1, Patrick Jöckel4, Rolf Sander1, Veronica Fall5, Simon Rosanka3, Vlassis Karydis3, Dimitris Akritidis6, Tamara Emmerichs3, Monica Crippa7, Diego Guizzardi7, Johannes W. Kaiser8, Lieven Clarisse2, Astrid Kiendler-Scharr3, Holger Tost9, and Alexandra Tsimpidi3,10 Andrea Pozzer et al.
  • 1Atmospheric Chemistry Department, Max Planck Institute for Chemistry, Mainz, Germany
  • 2Université libre de Bruxelles (ULB), Spectroscopy, Quantum Chemistry and Atmospheric Remote Sensing (SQUARES), Brussels, Belgium
  • 3Institute of Energy and Climate Research, IEK-8: Troposphere, Forschungszentrum Jülich GmbH, 52428 Jülich, Germany
  • 4Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, Oberpfaffenhofen, Germany
  • 5Illinois-Indiana Sea Grant, University of Illinois, Champaign, IL, USA
  • 6Department of Meteorology and Climatology, School of Geology, Aristotle University of Thessaloniki, Thessaloniki, Greece
  • 7European Commission, Joint Research Centre, Ispra (VA), Italy
  • 8Satellite-based Climate Monitoring Unit, Deutscher Wetterdienst (DWD), Offenbach am Main, Germany
  • 9Institute for Atmospheric Physics, Johannes Gutenberg University, Mainz, Germany
  • 10National Observatory of Athens, Inst. for Environmental Research and Sustainable Development, Athens, 15236, Greece

Abstract. An updated and expanded representation of organics in the chemistry general circulation model EMAC (ECHAM5/MESSy for Atmospheric Chemistry) has been evaluated. First, the comprehensive Mainz Organic Mechanism (MOM) in the submodel MECCA (Module Efficiently Calculating the Chemistry of the Atmosphere) was activated with explicit degradation of organic species up to five carbon atoms and a simplified mechanism for larger molecules. Second, the ORACLE submodel (version 1.0) considers now condensation on aerosols for all organics in the mechanism. Parameterizations for aerosol yields are used only for the lumped species that are not included in the explicit mechanism. The simultaneous usage of MOM and ORACLE allows an efficient estimation, not only of the chemical degradation of the simulated volatile organic compounds, but also of the contribution of organics to the growth and fate of (organic) aerosol, with a complexity of the mechanism largely increased compared to EMAC simulations with more simplified chemistry. The model evaluation presented here reveals that the OH concentration is well reproduced globally, while significant biases for observed oxygenated organics are present. We also investigate the general properties of the aerosols and their composition, showing that the more sophisticated and process-oriented secondary aerosol formation does not degrade the good agreement of previous model configurations with observations at the surface, allowing further research in the field of gas-aerosol interactions.

Andrea Pozzer et al.

Status: open (until 25 Nov 2021)

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Andrea Pozzer et al.

Andrea Pozzer et al.


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Short summary
A newly developed set-up of the chemistry general circulation model EMAC (ECHAM5/MESSy for Atmospheric Chemistry) is here evaluated; a comprehensive organic degradation mechanism is used and coupled with a volatility base model. The results show that the model is reproducing most of the tracer and aerosols satisfactorily, although with discrepancies for oxygenated organic gases and that this model configuration can be used for further research in atmospheric chemistry.