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Model studies of short-term variations induced in trace gases by particle precipitation in the mesosphere and lower thermosphere

Fytterer, T. 1; Bender, S. 1; Berger, U.; Nieder, H. 1; Sinnhuber, M. ORCID iD icon 1; Wissing, J. M.
1 Institut für Meteorologie und Klimaforschung (IMK), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

The 3-D global chemistry and transport model (3dCTM) was used to investigate NO, OH, and O3 from January 2002 to May 2010 between 60 km and 133 km. Their daytime and nighttime mean zonal means (55°–75° geomagnetic latitude) were analyzed with respect to short-term variations associated with particle precipitation. The corresponding ionization rates were derived from the 3-D atmospheric ionization module Osnabrück (AIMOS), which is based on particle flux measurements. The trace gas variations with respect to their background were investigated by using a superposed epoch analysis. The 27 day signature associated with particle precipitation is found in NO, while it is only indicated in OH and O3 during winter. A varying solar spectrum associated with the 11 year solar cycle causes modifications of this signal up to 10%, while the main patterns are conserved. Published observations show a clear 27 day signal, qualitatively agreeing with the model results at altitudes >70 km except for O3 in Northern Hemisphere winter. Further differences occur with respect to the magnitude of the trace gas variations, primarily attributed to the different trace gas background and dynamical variations of the background atmosphere. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000063199
Veröffentlicht am 18.01.2018
DOI: 10.1002/2015JA022291
Zitationen: 6
Zitationen: 6
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2016
Sprache Englisch
Identifikator ISSN: 2169-9380, 0148-0227, 2156-2202, 2169-9402
KITopen-ID: 1000063199
HGF-Programm 12.04.05 (POF III, LK 01) Trends,Variaility,Large-Scale Processes
Erschienen in Journal of geophysical research / Space physics
Verlag John Wiley and Sons
Band 121
Heft 10
Seiten 10,431–10,447
Nachgewiesen in Scopus
Web of Science
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