Atmospheric excitation of the earth's annual wobble - 1980-1988

Details Atmospheric excitation of the earth's annual wobble - 1980-1988 Atmospheric excitation of the earth's annual wobble - 1980-1988

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.6577c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, April 10, 1991, p. 6577-6582.

Mathematics

Logic

27

Angular Momentum, Atmospheric Circulation, Earth Rotation, Polar Wandering (Geology), Annual Variations, Geopotential Height, Power Spectra, Wind Velocity

Scientific paper

Global meteorological analyses from the European Center for Medium Range Weather Forecasts are employed to compute the atmospheric excitation psi of the polar motion for the 9-year period of 1980-1988. Both the matter component psi(matter) and the motion component psi (motion) are computed, the former with and without the oceanic inverted barometer (IB) effect. It is found that psi(motion) contributes significantly to the total excitation psi overall and nonnegligibly to the annual signal in psi, or the annual wobble excitation in particular. The results for the annual wobble excitation, in terms of the prograde component psi(t) and the retrogade component phsi(-) for January 1, are within the (rather large) range of previous estimates. The IB effect has a small impact on psi(+), whereas its impact on psi(-) is considerable.

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