The MESSy source code is available under the GNU General Public License (GPL) at no charge. Since the GPL was not written with scientific programs in mind, the source-code is not directly accessible from the web.

If you would like to use or to contribute to MESSy, please send a letter of intent to

Please note further:

• If you plan to apply for external funding and your proposal involves the application and/or further development of MESSy, you are requested to inform messy_admin@lists.mpic.de to avoid conflicts of interest.
• The MESSy submodels are categorised individually, depending on their development and publication status (see list of submodels: MESSy Submodels, information can be found here: MESSy-submodel license information).
• When you plan to publish results based on MESSy in a scientific journal, the Creative Commons Attribution-NonCommerical-ShareAlike Licence also applies. In particular, we ask you to follow these points:
  • You are requested to consult us ( messy_admin@lists.mpic.de) on proper acknowledgement, and in particular on potential co-authorships, during the early drafting phase of your manuscript (publication or proposal). Please recall that all submodel maintainers should be contacted individually about the use of the code, recent bug-fixes and other changes, and proper acknowledgement or co-authorship (see the traffic light regulations: MESSy-submodel license information). We will only request co-authorship for model developers where it is really appropriate.
  • We request that colleagues using ECHAM5/MESSy or stand-alone components of MESSy in planned publications or proposals send a preprint of their draft manuscript at least two weeks prior to submission to messy_admin@lists.mpic.de to give us some time to check and prevent misinterpretation of model results and conflicts of interest. Normally we put drafts on our internal, password protected server. If you object to this procedure, we will instead distribute the draft only to submodel maintainers involved.
  • Please cite the application of ECHAM5/MESSy as
    "The ECHAM/MESSy Atmospheric Chemistry (EMAC) model is a numerical chemistry and climate simulation system that includes sub-models describing tropospheric and middle atmosphere processes and their interaction with oceans, land and human influences (Jöckel et al., 2006). It uses the first version of the Modular Earth Submodel System (MESSy1) to link multi-institutional computer codes. The core atmospheric model is the 5th generation European Centre Hamburg general circulation model (ECHAM5, Roeckner et al., 2006). For the present study we applied EMAC (ECHAM5 version 5.3.01, MESSy version 1.9) in the T42L90MA-resolution, i.e. with a spherical truncation of T42 (corresponding to a quadratic gaussian grid of approx. 2.8 by 2.8 degrees in latitude and longitude) with 90 vertical hybrid pressure levels up to 0.01 hPa. The applied model setup comprised the submodels ..." (other versions/resolutions as appropriate) followed by a list of submodels (with references, see MESSy Publications) with the following references
    
    • P. Jöckel, H. Tost, A. Pozzer, C. Brühl, J. Buchholz, L. Ganzeveld, P. Hoor, A. Kerkweg, M. G. Lawrence, R. Sander, B. Steil, G. Stiller, M. Tanarhte, D. Taraborrelli, J. van Aardenne, J. Lelieveld, The atmospheric chemistry general circulation model ECHAM5/MESSy1: consistent simulation of ozone from the surface to the mesosphere, Atmos. Chem. Phys., 6, 5067-5104, 2006.
      http://www.atmos-chem-phys.net/6/5067/2006/
    • E. Roeckner, Brokopf, R., Esch, M., Giorgetta, M., Hagemann, S., Kornblueh, L., Manzini, E., Schlese, U., and Schulzweida, U.: Sensitivity of simulated climate to horizontal and vertical resolution in the ECHAM5 atmosphere model, J. Climate, 19, 3771-3791, 2006.
  • Please cite the following publication for applications of MESSy:
    
    • P. Jöckel, R. Sander, A. Kerkweg, H. Tost, and J. Lelieveld, Technical Note: The Modular Earth Submodel System (MESSy) - a new approach towards Earth System Modeling, Atmos. Chem. Phys., 5, 433-444, 2005.
      http://www.atmos-chem-phys.net/5/433/2005/
• If you have developed additional code based on MESSy, you are expected to make it available to the scientific community using this license. Please email us a copy of your new code. This will help us to coordinate developments of different research groups.
• Note that the base model ECHAM5 is NOT part of MESSy! The GCM ECHAM5 has been developed at the Max Planck-Institute for Meteorology in Hamburg. If you want to use ECHAM5/MESSy, you need to apply for an ECHAM5 license first, see: http://www.mpimet.mpg.de/en/wissenschaft/modelle/echam/echam5.html
  Please send us a copy of the ECHAM5 license approval together with your letter of intent.