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RAYMOND J. DELAND

Abstract

Zonal harmonics of the radiances measured by the three central channels of the SIRS instrument on Nimbus 3, representing vertically averaged temperatures in the lower and middle stratosphere, were computed. The traveling components of the lowest zonal wave numbers were estimated by the quadrature-spectrum method of Deland for periods of 1–12 cycles/mo.

The westward-traveling planetary-scale waves in the equatorial regions, previously described by Fritz, are approximately in phase with, and appear to be forced by, the westward-traveling planetary waves of middle latitudes. The traveling planetary waves are eastward traveling in high southern latitudes in winter, in contrast to an average slow westward motion in high northern latitudes in winter. The vertical structure of the traveling planetary-scale waves is remarkably uniform for all latitudes, with the temperature waves in the lower stratosphere (channels 6 and 7) lagging behind those in the middle stratosphere (channel 8) by approximately 2 days.

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Raymond J. Deland

Abstract

No abstract available.

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RAYMOND J. DELAND

Abstract

One month of daily spherical harmonic expansions of 500-mb. height in the Northern Hemisphere were studied. The movements of the waves are compared with the Rossby-Haurwitz wave speeds computed from the zonal geostrophic wind profile. Systematic differences between the observed and theoretical wave speeds are found.

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RAYMOND J. DELAND

Abstract

No Abstract Available.

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RAYMOND J. DELAND
and
YEONG-JER LIN

Abstract

Fluctuations of the planetary-scale waves, represented by spherical harmonics of the 500-mb. geopotential field, are statistically analyzed. A study is made of the prediction of these fluctuations from previous changes and using the non-divergent spherical vorticity equation.

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RAYMOND J. DELAND
and
KEITH W. JOHNSON

Abstract

The vertical structure of traveling planetary-scale waves is investigated using spherical harmonics of the geopotential field at levels from 1000 mb. to 10 mb., obtained from ESSA analyses. Fluctuations of the large-scale harmonics are analyzed using vector regression methods.

Westward-moving planetary-scale waves are shown to be present throughout the year at all the levels analyzed, with upward increasing amplitude in winter.

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