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The influence of Middle Range Energy Electrons on atmospheric chemistry and regional climate

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Publication date 2016
Author Arsenovic P., Rozanov E., Stenke A., Funke B., Wissing J.M., Mursula K., Tummon F., Peter T.,
Project Future and Past Solar Influence on the Terrestrial Climate II
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Original article (peer-reviewed)

Journal Journal of Atmospheric and Solar-Terrestrial Physics
Volume (Issue) 149
Page(s) 180 - 190
Title of proceedings Journal of Atmospheric and Solar-Terrestrial Physics
DOI 10.1016/j.jastp.2016.04.008

Open Access

Abstract

We investigate the influence of Middle Range Energy Electrons (MEE; typically 30-300 keV) precipitation on the atmosphere using the SOCOL3-MPIOM chemistry-climate model with coupled ocean. Model si- mulations cover the 2002-2010 period for which ionization rates from the AIMOS dataset and atmo- spheric composition observations from MIPAS are available. Results show that during geomagnetically active periods MEE significantly increase the amount of NOy and HOx in the polar winter mesosphere, in addition to other particles and sources, resulting in local ozone decreases of up to 35%. These changes are followed by an intensification of the polar night jet, as well as mesospheric warming and stratospheric cooling. The contribution of MEE also substantially enhances the difference in the ozone anomalies between geomagnetically active and quiet periods. Comparison with MIPAS NOy observations indicates that the additional source of NOy from MEE improves the model results, however substantial under- estimation above 50 km remains and requires better treatment of the NOy source from the thermo- sphere. A surface air temperature response is detected in several regions, with the most pronounced warming occurring in the Antarctic during austral winter. Surface warming of up to 2 K is also seen over continental Asia during boreal winter.
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