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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/gmd-2018-235
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2018-235
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Model evaluation paper 11 Oct 2018

Model evaluation paper | 11 Oct 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).

The aerosol-climate model ECHAM6.3-HAM2.3: Aerosol evaluation

Ina Tegen1, David Neubauer2, Sylvaine Ferrachat2, Colombe Siegenthaler-Le Drian3, Isabelle Bey3,a, Nick Schutgens4,b, Philip Stier4, Duncan Watson-Parris4, Tanja Stanelle2, Hauke Schmidt5, Sebastian Rast5, Harri Kokkola6, Martin Schultz7, Sabine Schroeder7, Nikos Daskalakis8, Stefan Barthel1, Bernd Heinold1, and Ulrike Lohmann2 Ina Tegen et al.
  • 1Leibniz Institute for Tropospheric Research, Leipzig, Germany
  • 2Centre for Climate Systems Modeling (C2SM), ETH Zurich, Switzerland
  • 3Department of Physics, University of Oxford, United Kingdom
  • 4Institute of Atmospheric and Climate Science, ETH Zurich, Switzerland
  • 5Max Planck Institute for Meteorology, Hamburg, Germany
  • 6Atmospheric Research Centre of Eastern Finland, Finnish Meteorological Institute, Kuopio, Finland
  • 7Forschungszentrum Juelich, Juelich, Germany
  • 8Laboratory for Modeling and Observation of the Earth System (LAMOS), Institute of Environmental Physics (IUP), University of Bremen, Bremen, Germany
  • anow at: MeteoSwiss, Geneva, Switzerland
  • bnow at: Faculty of Life and Earth Sciences, Vrije Universiteit, Amsterdam, The Netherlands

Abstract. We introduce and evaluate the aerosol simulations with the global aerosol-climate model ECHAM6.3-HAM2.3, which is the aerosol component of the fully coupled aerosol-chemistry-climate model ECHAM-HAMMOZ. Both the host atmospheric climate model ECHAM6.3 and the aerosol model HAM2.3 were updated from previous versions. The updated version of the HAM aerosol model contains improved parameterizations of aerosol processes such as cloud activation, as well as updated emission fields for anthropogenic aerosol species and modifications in the online computation of sea salt and mineral dust aerosol emissions. Aerosol results from nudged and free running simulations for the 10-year period 2003 to 2012 are compared to various measurements of aerosol properties. While there are regional deviations between model and observations, the model performs well overall in terms of aerosol optical thickness, but may underestimate coarse mode aerosol concentrations to some extent, so that the modeled particles are smaller than indicated by the observations. Sulfate aerosol measurements in the US and Europe are reproduced well by the model, while carbonaceous aerosol species are biased low. Both mineral dust and sea salt aerosol concentrations are improved compared to previous versions of ECHAM-HAM. The evaluation of the simulated aerosol distributions serves as a basis for the suitability of the model for simulating aerosol-climate interactions in a changing climate.

Ina Tegen et al.
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Status: final response (author comments only)
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Ina Tegen et al.
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Short summary
We describe a new version of the aerosol-climate model ECHAM-HAM and show tests of the performance of model by comparing different aspects of the aerosol distribution with different datasets. The updated version of the HAM aerosol model contains improved descriptions of aerosol processes including updated emission fields and cloud processes. While there are regional deviations between model and observations, the model performs well overall.
We describe a new version of the aerosol-climate model ECHAM-HAM and show tests of the ...
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