Correction and update to 'The earth's C21 and S21 gravity coefficients and the rotation of the core'

Details Correction and update to 'The earth's C21 and S21 gravity coefficients and the rotation of the core' Correction and update to 'The earth's C21 and S21 gravity coefficients and the rotation of the core'

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990geoji.101..709w&link_type=abstract

Geophysical Journal International (ISSN 0955-419X), vol. 101, June 1990, p. 709-711.

Other

6

Earth Core, Earth Mantle, Gravitational Fields, Rotating Fluids, Topography, Angular Velocity, Axes Of Rotation, Earth Rotation, Spherical Harmonics

Scientific paper

Wahr (1987) used satellite constraints on C21 and S21 (the spherical harmonic coefficients of the earth's external gravitational potential) to infer certain properties of the core and core/mantle boundary. It is shown here, contrary to the claim by Wahr, that it is not possible to use C21 and S21 to placed bounds on the core's products of inertia. As a result, Wahr's constraints on the l = 2, m = 1 components of the core/mantle boundary topography and on the angular orientation of the inner core with respect to the earth's rotation vector are not justified. On the other hand, Wahr's conclusions about the time-averaged torque between the core and mantle and the resulting implications for the l = 2, m = 1 components of fluid pressure at the top of the core can be strengthened. Wahr's conclusions about the mean rotational flow in the core are unaltered.

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