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Impact of chlorine ion chemistry on ozone loss in the middle atmosphere during very large solar proton events

Borthakur, Monali 1; Sinnhuber, Miriam ORCID iD icon 2; Laeng, Alexandra 1; Reddmann, Thomas 1; Braesicke, Peter 1; Stiller, Gabriele ORCID iD icon 2; Clarmann, Thomas von; Funke, Bernd; Usoskin, Ilya; Wissing, Jan Maik; Yakovchuk, Olesya
1 Institut für Meteorologie und Klimaforschung (IMK), Karlsruher Institut für Technologie (KIT)
2 Institut für Meteorologie und Klimaforschung – Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF), Karlsruher Institut für Technologie (KIT)

Abstract:

Solar coronal mass ejections can accelerate charged particles, mostly protons, to high energies, causing solar proton events (SPEs). Such energetic particles can precipitate upon the Earth's atmosphere, mostly in polar regions because of geomagnetic shielding. Here, SPE-induced chlorine activation due to ion chemistry can occur, and the activated chlorine depletes ozone in the polar middle atmosphere. We use the state-of-the-art 1D stacked-box Exoplanetary Terrestrial Ion Chemistry (ExoTIC) model of atmospheric ion and neutral composition to investigate such events in the Northern Hemisphere (NH). The Halloween SPE that occurred in late October 2003 is used as a test field for our study. This event has been extensively studied before using different 3D models and satellite observations. Our main purpose is to use such a large event that has been recorded by the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) on the Environmental Satellite (ENVISAT) to evaluate the performance of the ion chemistry model. Sensitivity tests were carried out for different model settings with a focus on the chlorine species of HOCl and ClONO2 as well as O3 and reactive nitrogen, NOy. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000163443
Veröffentlicht am 25.10.2023
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
Institut für Meteorologie und Klimaforschung (IMK)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 17.10.2023
Sprache Englisch
Identifikator ISSN: 1680-7324
KITopen-ID: 1000163443
HGF-Programm 12.11.28 (POF IV, LK 01) The role of the near-Earth space
Erschienen in Atmospheric Chemistry and Physics
Verlag European Geosciences Union (EGU)
Band 23
Heft 20
Seiten 12985–13013
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 16.10.2023
Nachgewiesen in Web of Science
Dimensions
Scopus
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