Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sa22a06w&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SA22A-06
Physics
0341 Middle Atmosphere--, Onstituent Transport And Chemistry (3334), 3334 Middle Atmosphere Dynamics (0341, 0342)
Scientific paper
Observation of wavelike radiance structures in the below the horizon (BTH) CO2 4.3 μ m band by the MSX satellite [Picard et al, GRL, 25, 2809,1998; Dewan et al, GRL, 25, 939, 1998] have been interpreted as gravity wave induced perturbations of the background emission. That analysis used band radiance contribution functions (CFs), calculated using an accurate LBL radiative transfer model (FASCODE), to show that the MSX instrument is sensitive to temperature perturbations in the upper stratosphere. In this work we rigorously simulate wave-induced emission fluctuations using an accurate line-by-line radiative transfer model (FASCODE) for the line-of-sight radiance corresponding to space-based BTH observations through a gravity wave perturbed atmosphere. We show that, for small perturbations likely to be present in the stratosphere where the CFs peak, the CF approximation is an adequate representation for response to wave perturbations. We examine the sensitivity of the CFs to the background atmospheric profile (temperature and pressure) and show that a reasonable description of the background (accurate climatology) is necessary in order to use the CF analysis. In the daytime, however, the CO2 4.3 μ m band becomes progressively more non-LTE above 50 km and the CF approach is no longer directly applicable. Although there is a secondary peak in the CF in the 80-90km region where the ν 3 bands are efficiently pumped by solar excitation, we show that radiance from this region does not significantly contribute to the wave induced emission because the source function there is largely decoupled from the kinetic temperature. The simulation shows that the radiance structure arising from realistic wave fields does in fact look like the radiance structures observed by MSX. We also simulate the perturbations seen in OH airglow near 85 km arising from the same wave field.
Makhlouf U. B.
Picard Richard H.
Winick Jeremy R.
Wintersteiner Peter P.
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