Physics – Geophysics
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....20.3869v&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 20, April 20, 1985, p. 3869-3879.
Physics
Geophysics
Geophysics, Planetary Waves, Stratosphere, Traveling Waves, Amplitudes, Eigenvectors, Latitude, Orthogonal Functions, Propagation Modes, Southern Hemisphere
Scientific paper
The temperature amplitude and phase structures of zonally propagating planetary waves are determined between 79 S and 79 N latitudes at the 10 and 1 mbar levels through the use of spectral analysis and complex-valued empirical orthogonal function analysis. The data are temperatures regressed from Nimbus 4 and 5 satellite infrared radiances during the solstitial seasons of 1970-1974. The structures of three westward moving normal modes and two eastward moving modes linked to instabilities near the winter stratopause are described. Waves of zonal wavenumber 4, 5, and 6 which are eastward moving in the summer Southern Hemisphere are also observed; a wave 1, 16-day period, westward moving mode commonly observed in geopotential fields is not seen here. The results concur with recent studies of traveling waves and provide estimates of average wave temperature amplitudes in the upper stratosphere.
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