18 April 2003 Structure of radiance from an atmosphere perturbed by superposed gravity waves
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Analysis of 4.3-μm CO2 radiance data from the MSX (Midcourse Space Experiment) satellite has shown that gravity waves dominate the fluctuations of radiance at 4.3 μm for both earthlimb (above-the-horizon) and downlooking (below-the-horizon) lines-of-sight under a broad class of conditions. We review previous work on the spectra of known sources of gravity waves and on wave filtering mechanisms by M. J. Alexander and others, as well as the characteristics of gravity-wave power spectra. We then consider the power spectra of line-of-sight radiance fluctuations emitted and self-absorbed by an atmosphere perturbed by gravity waves, discussing the shape of the spectrum and the spectral slopes. We show examples of radiance spectra from gravity-wave-perturbed atmospheres that have two different slopes, with a steeper slope at large wavenumber, and discuss mechanisms that can account for this effect. The effect of latitude and season on the 4.3-μm fluctuations will also be considered.
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Richard H. Picard, Richard H. Picard, Edmond M. Dewan, Edmond M. Dewan, James H. Brown, James H. Brown, Robert R. O'Neil, Robert R. O'Neil, Jeremy R. Winick, Jeremy R. Winick, William A. M. Blumberg, William A. M. Blumberg, Peter P. Wintersteiner, Peter P. Wintersteiner, } "Structure of radiance from an atmosphere perturbed by superposed gravity waves", Proc. SPIE 4882, Remote Sensing of Clouds and the Atmosphere VII, (18 April 2003); doi: 10.1117/12.463361; https://doi.org/10.1117/12.463361

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