Modeling the Chemical and Dynamical Response of the Whole Atmosphere to Energetic Particle Precipitation

Details Modeling the Chemical and Dynamical Response of the Whole Atmosphere to Energetic Particle Precipitation Modeling the Chemical and Dynamical Response of the Whole Atmosphere to Energetic Particle Precipitation

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa34a..03m&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA34A-03

Physics

0335 Ion Chemistry Of The Atmosphere (2419, 2427), 0340 Middle Atmosphere: Composition And Chemistry, 3334 Middle Atmosphere Dynamics (0341, 0342), 3337 Global Climate Models (1626, 4928), 3369 Thermospheric Dynamics (0358)

Scientific paper

Investigations into the role of the middle and upper atmosphere on climate have led to development of coupled chemistry climate models that extend in altitude to the mesosphere and lower thermosphere. These models are now being used to investigate the importance of variable solar and geomagnetic forcing on composition and dynamics throughout the whole atmosphere.This study reviews investigations into the influence of energetic particle precipitation (EPP) on stratospheric composition and dynamics, and presents analysis of simulations using NCAR's Whole Atmosphere Community Climate Model (WACCM). We find ionization from EPP in the polar regions during the declining phase of solar cycle 23 lead to significant increases in the concentration of hydrogen and nitrogen species. This period was remarkable in that it included a series of large solar proton events (SPEs). Analysis of an ensemble of WACCM simulations indicates that SPEs affect ozone chemistry either directly via increased catalytic loss from the enhanced hydrogen and nitrogen species, or indirectly from perturbations to active chlorine and bromine partitioning. In the stratosphere, ozone and temperatures changes can persist for months following an SPE and are not restricted to the region where SPE ionization occurred.

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