Mathematics – Logic
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa23b..09s&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SA23B-09
Mathematics
Logic
[0341] Atmospheric Composition And Structure / Middle Atmosphere: Constituent Transport And Chemistry, [2455] Ionosphere / Particle Precipitation, [3334] Atmospheric Processes / Middle Atmosphere Dynamics
Scientific paper
Model studies have suggested that Odd Nitrogen, NOx, created by Energetic Particle Precipitation (EPP) and the consequent ozone loss through catalytic loss cycles could have an effect on stratospheric and tropospheric (e.g. surface level) temperatures. These effects can potentially be comparable to the effects induced by the solar cycle at high latitudes. Significant mesospheric and stratospheric NOx enhancements have been observed during times of high solar activity (e.g. during Solar Proton Events). NOx can also be, through dynamics, transported from high altitudes (mesosphere-lower thermosphere), where it's created by EPP, down to the stratosphere. Once the NOx reaches the the stratosphere, ozone loss reactions involving NOx provide a link to the general stratospheric ozone balance. Surface temperature effects similar to those reported in the model studies were recently found in re-analysis meteorological data sets, but the mechanism connecting the high altitude NOx production to the surface level remained unclear. In this work, using meteorological re-analysis and operational data sets from the European Centre for Medium Range Weather Forecast and the UK Met Office from 1957 to 2009, we examine the vertical propagation and extent, particularly in the stratosphere, of temperature and wind anomalies related to enhanced geomagnetic activity (i.e. enhanced EPP into the atmosphere), to provide better understanding of the linking mechanism. Furthermore we discuss results from the atmospheric chemistry general circulation model ECHAM5/MESSy, which provides a more comprehensive view of the variation in atmospheric parameters as a result of varying EPP input.
Baumgaertner A. J.
Clilverd Mark
Jöckel P.
Seppälä A. M.
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