GMD Geoscientific Model Development GMD Geosci. Model Dev. 1991-9603 Copernicus Publications Göttingen, Germany 10.5194/gmd-3-717-2010 Development cycle 2 of the Modular Earth Submodel System (MESSy2) Jöckel P. 1 4 Kerkweg A. 2 Pozzer A. 3 Sander R. 1 Tost H. 1 Riede H. 1 Baumgaertner A. 1 Gromov S. 1 Kern B. 1 Max-Planck Institute for Chemistry, Air Chemistry Department, P.O. Box 3060, 55020 Mainz, Germany Institute for Atmospheric Physics, University Mainz, 55128 Mainz, Germany Cyprus Institute, EEWRC, P.O. Box 27456, 1645 Nicosia, Cyprus now at: Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre, Oberpfaffenhofen, 82230 Wessling, Germany 22 12 2010 3 2 717 752 Copyright: © 2010 P. Jöckel et al. 2010 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://gmd.copernicus.org/articles/3/717/2010/gmd-3-717-2010.html The full text article is available as a PDF file from https://gmd.copernicus.org/articles/3/717/2010/gmd-3-717-2010.pdf

The Modular Earth Submodel System (MESSy) is an open, multi-institutional project providing a strategy for developing comprehensive Earth System Models (ESMs) with highly flexible complexity. The first version of the MESSy infrastructure and process submodels, mainly focusing on atmospheric chemistry, has been successfully coupled to an atmospheric General Circulation Model (GCM) expanding it into an Atmospheric Chemistry GCM (AC-GCM) for nudged simulations and into a Chemistry Climate Model (CCM) for climate simulations. <br><br> Here, we present the second development cycle of MESSy, which comprises (1) an improved and extended infrastructure for the basemodel independent coupling of process-submodels, (2) new, highly valuable diagnostic capabilities for the evaluation with observational data and (3) an improved atmospheric chemistry setup. With the infrastructural changes, we place the headstone for further model extensions from a CCM towards a comprehensive ESM. The new diagnostic submodels will be used for regular re-evaluations of the continuously further developing model system. The updates of the chemistry setup are briefly evaluated.

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