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The earth's angular momentum budget on subseasonal time scalesIrregular length of day (LOD) fluctuations on time scales of less than a few years are largely produced by atmospheric torques on the underlying planet. Significant coherence is found between the respective time series of LOD and atmospheric angular momentum (AAM) determinations at periods down to 8 days, with lack of coherence at shorter periods caused by the declining signal-to-measurement noise ratios of both data types. Refinements to the currently accepted model of tidal earth rotation variations are required, incorporating in particular the nonequilibrium effect of the oceans. The remaining discrepancies between LOD and AAM in the 100- to 10-day period range may be due to either a common error in the AAM data sets from different meteorological centers, or another component of the angular momentum budget.
Document ID
19920038875
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Dickey, J. O.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Marcus, S. L.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Steppe, J. A.
(JPL Pasadena, CA, United States)
Hide, R.
(Oxford, University Observatory, United Kingdom)
Date Acquired
August 15, 2013
Publication Date
January 17, 1992
Publication Information
Publication: Science
Volume: 255
ISSN: 0036-8075
Subject Category
Geophysics
Accession Number
92A21499
Distribution Limits
Public
Copyright
Other

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