Berlin 2014 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 2: Erdnaher Weltraum

EP 2.6: Vortrag

Montag, 17. März 2014, 18:00–18:15, DO24 1.103

Solar influence on the MLT region: NOx production due to energetic particles and solar radiation — •Holger Nieder¹, Nadine Wieters², and Miriam Sinnhuber¹ — ¹Karlsruhe Institute of Technology, Institute for Meteorology and Climate Research — ²University of Bremen, Institute of Environmental Physics

The chemistry in the mesosphere/lower thermosphere (MLT) region is always driven by forcing from solar radiation and energetic particles. The resulting ionisation, dissociation and excitation of the constituents lead to production of reactive species such as NOx (N, NO, NO2), directly from dissociation as well as indirectly from subsequent ionic reactions. NOx can be transported downwards and contribute to ozone depletion in polar winter.

The production rate of NOx is approximately proportional to the ionisation rate, but the coefficient depends considerably on the atmospheric background state and on the types of primary ions produced, where the latter is different for photoionisation and ionisation due to energetic particles.

The production of NOx is investigated in detail. Its implications are studied using 1d chemistry and 3d chemistry and transport models.