Other
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsa51a0503p&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SA51A-0503
Other
0340 Middle Atmosphere: Composition And Chemistry, 0341 Middle Atmosphere: Constituent Transport And Chemistry (3334), 1650 Solar Variability
Scientific paper
Because they are entwined, considerable attention has been given to the understanding of the atmospheric effects of solar activities so that we may more clearly understand and more reliably predict the effects of human activities on the atmosphere. The talk, therefore, will present a new modeling study of the effects of solar maximum to minimum UV variability on the Earth's mesosphere and stratosphere. Several striking developments have taken place in atmospheric chemistry, since the previous modeling studies of the effects of solar UV variability. For example, a new source of odd nitrogen (NOX = NO + NO2) directly from the O2 and N2 principals rather than their O(1D) and N2O derivatives have been found. This source is driven by solar UV with λ < 205 nm. As another example, it has been found that photodissociation of O3 at λ 193 nm (or less) produces O(1S) and that this production significantly modifies the middle atmospheric source strength of the OH radicals. These new molecular processes directly amount to new mechanism to link the variable solar UV to the middle atmospheric trace species concentration, O3, heating rates, dynamics etceteras. Without the extra OH production via the O(1S), the new sources of NOX tend to widen the gap between the model predictions and observations of middle atmospheric O3 changes in response to solar maximum to minimum UV variation. The effect of the additional OH production is currently being modeled. The presentation will include discussions of both. Furthermore, what needs to be done in the laboratory, modeling, and observational data analysis will also be discussed.
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