Atmospheric angular momentum fluctuations, length-of-day changes and polar motion

Details Atmospheric angular momentum fluctuations, length-of-day changes and polar motion Atmospheric angular momentum fluctuations, length-of-day changes and polar motion

May 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983rspsa.387...31b&link_type=abstract

Royal Society (London), Proceedings, Series A - Mathematical and Physical Sciences (ISSN 0080-4630), vol. 387, no. 1792, May 9,

Mathematics

Logic

255

Angular Momentum, Atmospheric Effects, Daytime, Earth Rotation, Momentum Transfer, Polar Wandering (Geology), Atmospheric Circulation, Earth Movements, Equatorial Atmosphere, Geodynamics, Love Waves, Oblate Spheroids, Periodic Variations, Polar Coordinates, Wind Effects

Scientific paper

Meteorological effects on the variable rotation of the solid earth are discussed in terms of fluctuations in the total angular momentum of the atmosphere about the earth's center of mass. The basic formulas of nonrigid body rotational dynamics are briefly derived, the ensuing wobble excitation function is examined in detail, and some difficulties with standard treatments are identified. A simple new equatorial angular momentum function is proposed that can be accurately calculated from current meteorological data. The use of Love numbers to allow for the rotational and surface load deformation of the nonrigid earth is discussed, leading to a definition of effective angular momentum functions for the atmosphere. The values of the atmospheric angular momentum functions are compared with the astronomically observed values of length of day and polar motion.

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