Other
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990phdt........76f&link_type=abstract
Thesis (PH.D.)--UNIVERSITY OF COLORADO AT BOULDER, 1990.Source: Dissertation Abstracts International, Volume: 51-06, Section: B,
Other
Scientific paper
Inertio-gravity wave signals in the Limb Infrared Monitor of the Stratosphere (LIMS) satellite instrument temperature data are examined. The height, geographic, and time coverage includes most of the middle atmosphere (100 mb to.1 mb), almost the entire globe (64 S to 84 N), and late October 1978 to late May 1979. The resolution (~5.5 km vertically, and a single horizontal Nyquist wavelength of 144 km) is sufficient to capture those scales of middle atmosphere gravity waves which dominate the temperature spectrum. The inertio-gravity wave signal is defined by differencing profiles of total state temperatures and globally mapped planetary waves. These residual temperature profiles are characterized by growth with height (amplitude e-folding scales ~ 25 km), and strong correlation between adjacent profiles (decorrelation lengths ~1000 km). These characteristics are consistent with an inertio -gravity wave interpretation. Higher frequency gravity waves are excluded from the LIMS temperature data by radiative transfer effects. The inertio-gravity wave signals are quantified further by examining residual temperature variance, vertical spectra, and horizontal spectra. The variance shows intriguing though largely empirical relationships with the background winds. A strong correlation in time and space is seen between the LIMS inertio-gravity wave variance and the total gravity wave forcing inferred indirectly from the mapped large scale atmosphere. This correlation implies that inertio-gravity waves may be dominating the total gravity wave momentum transport in the lower to middle mesosphere. An alternative interpretation is that the inertio-gravity wave distribution is the same as that of the high frequency gravity waves, which both theory and ground-based observations indicate are important in the momentum budget of the mesosphere. The vertical inertio -gravity wave spectra are variable in shape, being red in winter but showing pronounced long wavelength rollover in the tropics and during summer. The inertio-gravity wave horizontal spectra are truly universal in shape, with slight rollover at long wavelength (>=q3000 km), very nearly like k_sp{H} {-5/3} at intermediate wavelengths, and slight flattening due to aliasing at short wavelengths (<=q1000 km). Horizontal spectra of the inverted temperature profiles are also examined. Such profiles contain signals of both inertio-gravity waves and planetary waves, but allow direct comparison with other high horizontal resolution measurements of the middle atmosphere. In contrast with the inertio-gravity wave spectra, these spectra are seen to have shapes which vary with height.
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