Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa11a1456h&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SA11A-1456
Physics
[0342] Atmospheric Composition And Structure / Middle Atmosphere: Energy Deposition, [2716] Magnetospheric Physics / Energetic Particles: Precipitating
Scientific paper
Energetic particle precipitation (EPP) in the upper atmosphere contributes to polar stratospheric enhancements of NOx. The first experimental evidence of this emerged when the Limb Infrared Monitor of the Stratosphere (LIMS) observed stratospheric NOx enhancements during the Arctic winter of 1978/79. Such enhancements have since been observed on numerous occasions, but until recently were much less obvious in the Northern Hemisphere than in the Southern Hemisphere. It is now understood that the magnitude of these stratospheric NOx enhancements depends on both the level of EPP and dynamical conditions. Three out of the last six Arctic winters have seen much larger than average polar stratospheric NOx enhancements due to EPP that have been attributed to extraordinary meteorological events. These are unique events on record and affirm that even with low levels of EPP, the stratosphere can still be influenced to a large degree by EPP. In this study, data from the LIMS instrument is revisited in order to understand the NOx enhancement it observed with respect to meteorological conditions and EPP activity. The temporal evolution of NOx in the polar vortex as measured by LIMS is compared to more recent satellite data, including the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) instrument. Preliminary results indicate that the enhancements are caused neither by elevated EPP nor unusual dynamical conditions, but rather are seen because of the ability of LIMS to observe in the polar night.
Funke Bernd
Harvey L.
Holt L. A.
Randall Cora E.
Stiller Gabriele P.
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