Other
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa53a1238f&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SA53A-1238
Other
[0340] Atmospheric Composition And Structure / Middle Atmosphere: Composition And Chemistry, [0355] Atmospheric Composition And Structure / Thermosphere: Composition And Chemistry, [3360] Atmospheric Processes / Remote Sensing
Scientific paper
Among the processes governing the energy balance in the mesosphere and lower thermosphere (MLT), the quenching of CO2(ν2) vibrational levels in collisions with oxygen atoms plays an important role. However, neither the rate coefficient of this process (k(CO2-O)) nor the atomic oxygen concentrations ([O]) in the MLT are well known. The discrepancy between k(CO2-O) measured in the lab and retrieved from atmospheric measurements is of about factor of 2.5. At the same time, the discrepancy between [O] in the MLT measured by different instruments is of the same order of magnitude. In this work we combine temperature data from a ground based lidar with limb radiances from a satellite infrared radiometer to estimate k(CO2-O). We used the night- and daytime temperatures between 80 and 110 km measured by the Colorado State University narrow-band sodium (Na) lidar located at Fort Collins, Colorado (41N, 255E) as ground truth of the SABER/TIMED nearly simultaneous (±10 minutes ) and common volume (within ±1 degree in latitude, ±2 degrees in longitude) observations. We used ALI-ARMS non-LTE research code designed to calculate the non-equilibrium radiance in planetary atmospheres to retrieve the product of k(CO2-O) x [O] from 15 μm CO2 limb radiance measured by SABER. The values retrieved for all overlapping measurements were then used to estimate the k(CO2-O) rate coefficient and its possible variation range by utilizing the [O] values measured by the SABER and other instruments.
Feofilov A.
Goldberg Richard A.
Kutepov Andrey
Pesnell William Dean
She Canlin
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