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The latitude-height structure of 40-50 day variations in atmospheric angular momentumUsing five years of U.S. National Meteorological Center twice-daily global analyses, a description of the two-dimensional latitude-height structure of the winds responsible for quasi-periodic variations in the relative angular momentum of the atmosphere observed by Langley et al. (1981) is constructed. Cross-spectral and amplitude phase eigenvector techniques indicate that these variations are associated with wave-like motions in the tropical upper troposphere which propagate poleward and downward in phase within the tropics. The tropical component is suggested to be the zonally averaged part of the motions described by Madden and Julian (1971, 1972), while a Northern Hemisphere midlatitude component whose phase is essentially independent of height may be a direct response to the tropical motions. Alternatively, both motions may be the common response to an as yet unidentified tropical forcing.
Document ID
19830063492
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Anderson, J. R.
(MIT Cambridge, MA, United States)
Rosen, R. D.
(Atmospheric and Environmental Research, Inc. Cambridge, MA, United States)
Date Acquired
August 11, 2013
Publication Date
June 1, 1983
Publication Information
Publication: Journal of the Atmospheric Sciences
Volume: 40
ISSN: 0022-4928
Subject Category
Geophysics
Accession Number
83A44710
Funding Number(s)
CONTRACT_GRANT: NAS5-25870
CONTRACT_GRANT: NAS5-27231
Distribution Limits
Public
Copyright
Other

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