A spectral analysis of the earth's angular momentum budget

Details A spectral analysis of the earth's angular momentum budget A spectral analysis of the earth's angular momentum budget

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.5385e&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, June 10, 1985, p. 5385-5404. NASA-supported research.

Physics

Geophysics

56

Angular Momentum, Atmospheric Effects, Earth Core, Earth Rotation, Spectrum Analysis, Bandpass Filters, Conservation Laws, Data Processing, Geophysics, Meteorology, Periodic Variations, Power Spectra, Tides

Scientific paper

The exchange of angular momentum between the solid earth and the atmosphere from January 1976 through March 1982 is investigated using estimates of the earth's rotation from optical astrometry and lunar laser ranging and meteorological estimates of the atmospheric angular momentum M(atm). The physics of the earth's angular momentum budget is described, and earth rotation measurements are related to changes in the angular momentum of the fluid parts of the earth. The availability and reliability of earth rotation and M(atm) data are reported, and the possibility of estimating the exchange of angular momentum with the oceans and with the core is examined. Estimates of the power spectrum, cospectral coherence, and linear transfer functions and an analysis of the unmodeled part of the angular momentum budget are presented and discussed. The amplitude and phase of the semiannual, monthly, and fortnightly tidal variations in the length of day are estimated after removing observed atmospheric excitation.

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