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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Volume 7, issue 6
Geosci. Model Dev., 7, 2653-2662, 2014
https://doi.org/10.5194/gmd-7-2653-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: The Modular Earth Submodel System (MESSy) (ACP/GMD inter-journal...

Geosci. Model Dev., 7, 2653-2662, 2014
https://doi.org/10.5194/gmd-7-2653-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

Model description paper 13 Nov 2014

Model description paper | 13 Nov 2014

The photolysis module JVAL-14, compatible with the MESSy standard, and the JVal PreProcessor (JVPP)

R. Sander1, P. Jöckel2, O. Kirner3, A. T. Kunert1,*, J. Landgraf4, and A. Pozzer1 R. Sander et al.
  • 1Air Chemistry Department, Max-Planck Institute of Chemistry, P.O. Box 3060, 55020 Mainz, Germany
  • 2Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, Oberpfaffenhofen, 82230 Wessling, Germany
  • 3Steinbuch Centre for Computing, Karlsruhe Institute of Technology, P.O. Box 3640, 76021 Karlsruhe, Germany
  • 4Netherlands Institute for Space Research (SRON), Utrecht, the Netherlands
  • *now at: Multiphase Chemistry Department, Max-Planck Institute of Chemistry, P.O. Box 3060, 55020 Mainz, Germany

Abstract. We present version 14 of the photolysis module JVAL. Taking atmospheric conditions as input, JVAL calculates photolysis rate coefficients, i.e. the speed of dissociation of atmospheric molecules in the sunlight. Computational efficiency is obtained through the use of parameters for polynomial curve fitting and lookup tables. Physical changes compared to the previous version include a parameterization of the Lyman-alpha absorption, and an update of the UV/VIS cross sections to the most recent recommended values. JVAL also includes the auxiliary program JVPP (JVal PreProcessor) which pre-calculates these parameters based on the absorption cross sections and quantum yields of the atmospheric molecules. It is possible to use JVAL either as a stand-alone program or as a module inside the Modular Earth Submodel System (MESSy). JVAL is a community model published under the GNU General Public License.

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