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A semi-empirical model for mesospheric and stratospheric NOy produced by energetic particle precipitation

Funke, Bernd; Lopez-Puertas, Manuel; Stiller, Gabriele P.; Versick, Stefan; Clarmann, Thomas von

The MIPAS Fourier transform spectrometer on board Envisat has measured global distributions of the six principal reactive nitrogen (NO$_{γ}$) compounds (HNO$_{3}$, NO$_{2}$, NO, N$_{2}$O$_{5}$, ClONO$_{2}$, and HNO$_{4}$) during 2002–2012. These observations were used previously to detect regular polar winter descent of reactive nitrogen produced by energetic particle precipitation (EPP) down to the lower stratosphere, often called the EPP indirect effect. It has further been shown that the observed fraction of NO$_{γ}$ produced by EPP (EPP-NO$_{γ}$ ) has a nearly linear relationship with the geomagnetic A$_{ρ}$ index when taking into account the time lag introduced by transport. Here we exploit these results in a semiempirical model for computation of EPP-modulated NO$_{γ}$ densities and wintertime downward fluxes through stratospheric and mesospheric pressure levels. Since the A$_{ρ}$ dependence of EPP-NO$_{γ}$ is distorted during episodes of strong descent in Arctic winters associated with elevated stratopause events, a specific parameterization has been developed for these episodes. This model accurately reproduces the observati ... mehr

Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
Steinbuch Centre for Computing (SCC)
Publikationstyp Zeitschriftenaufsatz
Jahr 2016
Sprache Englisch
Identifikator DOI: 10.5194/acp-16-8667-2016
ISSN: 1680-7316, 1680-7324
URN: urn:nbn:de:swb:90-599087
KITopen ID: 1000059908
HGF-Programm 12.04.05; LK 01
Erschienen in Atmospheric chemistry and physics
Band 16
Heft 13
Seiten 8667-8693
Lizenz CC BY 3.0 DE: Creative Commons Namensnennung 3.0 Deutschland
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