An Investigation of the Effect of Particle Ionization on the Earth's Middle Atmosphere Using a Two-dimensional Model

Details An Investigation of the Effect of Particle Ionization on the Earth's Middle Atmosphere Using a Two-dimensional Model An Investigation of the Effect of Particle Ionization on the Earth's Middle Atmosphere Using a Two-dimensional Model

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsa13a..01r&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SA13A-01

Physics

0300 Atmospheric Composition And Structure, 0340 Middle Atmosphere: Composition And Chemistry, 0341 Middle Atmosphere: Constituent Transport And Chemistry (3334), 2455 Particle Precipitation

Scientific paper

The amount of NO transported to the stratosphere is determined by mesospheric processes where uncertainties in the production, loss and transport of odd nitrogen exist. We have used the NRL 2 Dimensional model of atmospheric chemistry and dynamics to investigate aspects of the transport of odd nitrogen from the mesopause region to the upper stratosphere. An important aspect of the NOx transport problem is determining the influence of time varying middle energy electron ionization rates on the flux of odd nitrogen into the lower atmosphere. This problem is investigated with the two dimensional model employing a time dependent ionization source scaled to the measured particle energy incident on the atmosphere. The model results are guided by comparisons to HALOE measurements of mesospheric and stratospheric odd nitrogen. In particular we will use the data to provide information on the interannual and seasonal variability of odd nitrogen in the upper stratosphere/mesosphere. These data will be compared over several years with the model results employing the time dependent energy measurements to calculate the flux of odd nitrogen into the lower atmosphere. The effect of the enhanced odd nitrogen on upper stratospheric ozone will be discussed.

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