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Energetic particle precipitation in ECHAM5/MESSy – Part 2: Solar proton events

Baumgaertner, Andreas J. G. and Jöckel, Patrick and Riede, Hella and Stiller, Gabriele and Funke, Bernd (2010) Energetic particle precipitation in ECHAM5/MESSy – Part 2: Solar proton events. Atmospheric Chemistry and Physics, 10, pp. 7285-7302. DOI: 10.5194/acp-10-7285-2010.

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Official URL: http://www.atmos-chem-phys.net/10/7285/2010/


The atmospheric chemistry general circulation model ECHAM5/MESSy (EMAC) has been extended by processes that parameterize particle precipitation. Several types of particle precipitation that directly affect NOy and HOx concentrations in the middle atmosphere are accounted for and discussed in a series of papers. In part 1, the EMAC parameterization for NOx produced in the upper atmosphere by low-energy electrons is presented. Here, we discuss production of NOy and HOx associated with Solar Proton Events (SPEs). A submodel that parameterizes the effects of precipitating protons, based on flux measurements by instruments on the IMP or GOES satellites, was added to the EMAC model. Production and transport of NOy and HOx, as well as effects on other chemical species and dynamics during the 2003 Halloween SPEs are presented. Comparisons with MIPAS/ENVISAT measurements of a number of species affected by the SPE are shown and discussed. There is good agreement for NO2, but a severe disagreement is found for N2O similar to other studies. We discuss the effects of an altitude dependence of the N/NO production rate on the N2O and NOy changes during the SPE. This yields a modified parameterization that shows mostly good agreement between MIPAS and model results for NO2, N2O, O3, and HOCl. With the ability of EMAC to relax the model meteorology to observations, accurate assessment of total column ozone loss is also possible, yielding a loss of approximately 10 DU at the end of November. Discrepancies remain for HNO3, N2O5, and ClONO2, which are likely a consequence from the missing cluster ion chemistry and ion-ion recombination in the EMAC model as well as known issues with the model's NOy partitioning.

Document Type:Article
Title:Energetic particle precipitation in ECHAM5/MESSy – Part 2: Solar proton events
AuthorsInstitution or Email of Authors
Baumgaertner, Andreas J. G.MPI for Chemistry
Jöckel, PatrickPatrick.Joeckel@dlr.de
Riede, HellaMPI for Chemistry
Stiller, GabrieleFZ Karlsruhe
Funke, BerndFZ Karlsruhe
Date:August 2010
Journal or Publication Title:Atmospheric Chemistry and Physics
Refereed publication:Yes
In Open Access:Yes
In ISI Web of Science:Yes
Page Range:pp. 7285-7302
Keywords:energetic particles, atmospheric chemistry, solar proton events
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Atmosphären- und Klimaforschung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Dynamics
Deposited By: Patrick Jöckel
Deposited On:15 Nov 2010 18:21
Last Modified:12 Dec 2013 21:04

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