Journal cover Journal topic
Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/gmd-2017-191
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Model description paper
03 Nov 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).
The Chemistry Climate Model ECHAM6.3-HAM2.3-MOZ1.0
Martin G. Schultz1,a, Scarlet Stadtler1, Sabine Schröder1, Domenico Taraborrelli1, Bruno Franco1,b, Jonathan Krefting2, Alexandra Henrot3, Sylvaine Ferrachat4, Ulrike Lohmann4, David Neubauer4, Colombe Siegenthaler-Le Drian5, Sebastian Wahl6, Harri Kokkola7, Thomas Kühn7, Sebastian Rast8, Hauke Schmidt8, Philip Stier9, Doug Kinnison10, Geoffrey S. Tyndall10, John J. Orlando10, and Catherine Wespes11 1Institut für Energie- und Klimaforschung, IEK-8, Forschungszentrum Jülich, Germany
2Meteorologisches Institut, Universität Bonn, Bonn, Germany
3Unité de Modélisation du Climat et des Cycles Biogéochimiques, University of Liège, Liège, Belgium
4Institute for Atmospheric and Climate Science, ETH Zurich, Zurich, Switzerland
5Centre for Climate Systems Modeling (C2SM), ETH Zurich, Switzerland
6GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
7Finnish Meteorological Institute, Atmospheric Research Centre of Eastern Finland, Kuopio, Finland
8Max Planck Institute for Meteorology, Hamburg, Germany
9Atmospheric, Oceanic and Planetary Physics, Department of Physics, University of Oxford, Oxford, United Kingdom
10NCAR, Atmospheric Chemistry Observations & Modeling, Boulder, CO, USA
11Universite Libre de Bruxelles, Brussels, Belgium
anow at: Jülich Supercomputing Centre, Forschungszentrum Jülich, Germany
bnow at: Universite Libre de Bruxelles, Brussels, Belgium
Abstract. The chemistry climate model ECHAM-HAMMOZ contains a detailed representation of tropospheric and stratospheric reactive chemistry and state-of-the-art parametrisations of aerorols using either a modal scheme (M7) or a bin scheme (SALSA). This article describes and evaluates the model version ECHAM6.3-HAM2.3-MOZ1.0 with a focus on the tropospheric gas-phase chemistry. A ten-year model simulation was performed to test the stability of the model and provide data for its evaluation. The comparison to observations concentrates on the year 2008 and includes total column observations of ozone (O3) and carbon monoxide (CO) from Infrared Atmospheric Sounding Interferometer (IASI) and Ozone Monitoring Instrument (OMI), Microwave Limb Sounder (MLS) observations of temperature, nitric acid (HNO3), chlorine monoxide (ClO), and O3 for the evaluation of polar stratospheric processes, an ozone sonde climatology, surface ozone observations from the Tropospheric Ozone Assessment Report (TOAR) database, and surface CO data from the Global Atmosphere Watch network. Global budgets of ozone, hydroxide (OH), nitrogen oxides (NOx), aerosols, clouds, and radiation are analyzed and compared to the literature. ECHAM-HAMMOZ performs well in many aspects. However, in the base simulation, lightning NOx emissions are very low, and the impact of the heterogeneous reaction of HNO3 on dust and seasalt aerosol is too strong. Sensitivity simulations with increased lightning NOx or modified heterogeneous chemistry deteriorate the comparison with observations and yield excessively large ozone budget terms and too much OH. We hypothesize that this is an impact of potential issues with tropical convection in the ECHAM model.

Citation: Schultz, M. G., Stadtler, S., Schröder, S., Taraborrelli, D., Franco, B., Krefting, J., Henrot, A., Ferrachat, S., Lohmann, U., Neubauer, D., Siegenthaler-Le Drian, C., Wahl, S., Kokkola, H., Kühn, T., Rast, S., Schmidt, H., Stier, P., Kinnison, D., Tyndall, G. S., Orlando, J. J., and Wespes, C.: The Chemistry Climate Model ECHAM6.3-HAM2.3-MOZ1.0, Geosci. Model Dev. Discuss., https://doi.org/10.5194/gmd-2017-191, in review, 2017.
Martin G. Schultz et al.
Martin G. Schultz et al.
Martin G. Schultz et al.

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Short summary
The chemistry climate model ECHAM-HAMMOZ contains a detailed representation of tropospheric and stratospheric reactive chemistry and state-of-the-art parametrisations of aerorols. It thus allows detailed investigations of chemical processes in the climate system. Evaluation of the model with various observational data yields good results, but the model has a tendency to produce too much OH in the tropics. This highlights the important interplay between atmospheric chemistry and dynamics.
The chemistry climate model ECHAM-HAMMOZ contains a detailed representation of tropospheric and...
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