ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-12-5633-2012 Impacts of the January 2005 solar particle event on noctilucent clouds and water at the polar summer mesopause Winkler H. 1 von Savigny C. 1 Burrows J. P. 1 Wissing J. M. 2 Schwartz M. J. 3 Lambert A. 3 García-Comas M. 4 Institut für Umweltphysik, Universität Bremen, Bremen, Germany Fachbereich Physik, Universität Osnabrück, Osnabrück, Germany Jet Propulsion Laboratory, California Institute of Technology, Pasadena, USA Instituto de Astrofísica de Andalucía – CSIC, Granada, Spain 28 06 2012 12 12 5633 5646 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/12/5633/2012/acp-12-5633-2012.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/12/5633/2012/acp-12-5633-2012.pdf

The response of noctilucent clouds to the solar particle event in January 2005 is investigated by means of icy particle and ion chemistry simulations. It is shown that the decreasing occurrence rate of noctilucent clouds derived from measurements of the SCIAMACHY/Envisat instrument can be reproduced by one-dimensional model simulations if temperature data from the MLS/Aura instrument are used. The model calculations indicate that the sublimation of noctilucent clouds leads to significant changes of the water distribution in the mesopause region. These model results are compared with H<sub>2</sub>O measurements from the MLS and the MIPAS/Envisat satellite instruments. The pronounced modelled water enhancement below the icy particle layer and its decrease during the SPE are not observed by the satellite instruments. At altitudes >85 km the satellite measurements show an increase of H<sub>2</sub>O during the SPE in qualitative agreement with the model predictions. The discrepancies between model H<sub>2</sub>O and observations at lower altitudes might be attributed to the one-dimensional model approach which in particular neglects inhomogeneities and horizontal transport processes. Additionally, it is revealed that the water depletion due to reactions of proton hydrates during the considered solar particle event has only a minor impact on the icy particles.

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