The earth's angular momentum budget on subseasonal time scales

Details The earth's angular momentum budget on subseasonal time scales The earth's angular momentum budget on subseasonal time scales

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992sci...255..321d&link_type=abstract

Science (ISSN 0036-8075), vol. 255, Jan. 17, 1992, p. 321-324.

Mathematics

Logic

27

Angular Momentum, Atmospheric Effects, Daytime, Earth Rotation, Signal To Noise Ratios, Time Measurement, Geodesy, Kalman Filters, Power Spectra

Scientific paper

Irregular 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.

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