Observation of Tidal Effects on LWIR Radiance Above the Mesopause
Scientific rept. no. 2, 1 Aug 2005-31 Jul 2006
ARCON CORP WALTHAM MA
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An examination of CO2 infrared limb radiance, directly measured by the SABER instrument aboard the TIMED satellite, reveals unusual structure in the region just above the mesopause, at tangent heights of 95-110 km Global coverage afforded by SABER makes it possible to investigate this behavior, which includes prominent regions with positive radiance Gradients, as a function of latitude, local time, and season The local-time dependence, in particular, suggests a role for atmospheric tides using a tidal model, Global Scale Wave Model, and our non-GTE ARC rode, we modeled the 15 Om radiance. These calculations reproduced the main features of the Global radiance structure, including the heights where positive Gradients occur, and its variation with local time for different latitudes and seasons The conclusion is that tidal perturbation of the temperature field in the lower thermosphere is directly responsible for the observed variability of the long-wave infrared limb radiance.
- Atmospheric Physics