Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa21a0227z&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SA21A-0227
Other
0310 Airglow And Aurora, 0341 Middle Atmosphere: Constituent Transport And Chemistry (3334), 3332 Mesospheric Dynamics, 3389 Tides And Planetary Waves
Scientific paper
Airglow emissions are routinely used to remotely retrieve the abundances of atmospheric species. When the photochemical timescales of the species at the excited states are comparable to the dynamical timescales of the diurnal variation of temperature and wave motions, the coupling between dynamics and photochemistry becomes important in determining the strength and variation of the airglow emissions by those excited species. A one-dimensional photochemical-diffusive-advective model is used to quantitatively investigate the effect of dynamical-photochemical coupling on O2(1 Sigma) and O2(1 Delta) concentrations in the upper mesosphere and lower thermosphere. Specifically, we compare the fractional differences of the two excited species between those derived from the coupled model and from the photochemical equilibrium model. It is found that the fractional difference of O2(1 Sigma) is less than 0.5% due to its very short chemical relaxation time. On the other hand, the fractional difference of O2(1 Delta) ranges from more than 30% in early morning to about 10% in the later afternoon because its chemical relaxation time is comparable to that of diurnal variations. Large amplitudes of tidal waves near the mesopause and in the lower thermosphere are mainly responsible for the large fractional difference and uncertainty in O2(1 Delta) in the afternoon. By systematically comparing the 9.6 micron (ozone) and 1.27 micron (O2(1 Delta)) emissions measured by TIMED/SABER, we will discuss the implications of dynamical-photochemical coupling for ozone retrieved from 1.27 micron O2 emission in the upper mesosphere and lower thermosphere.
Mlynczak Martin G.
Russell James M.
Talaat Elsayed R.
Yee J.
Zhu Xiyu
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