Long Wavelength Dynamics of an Ice Age Earth: Implications for GRACE

Details Long Wavelength Dynamics of an Ice Age Earth: Implications for GRACE Long Wavelength Dynamics of an Ice Age Earth: Implications for GRACE

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusm.g13a..06m&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #G13A-06

Physics

1213 Earth'S Interior: Dynamics (8115, 8120), 1227 Planetary Geodesy And Gravity (5420, 5714, 6019), 1239 Rotational Variations

Scientific paper

The remnant gravitational signature of the Earth's response to the Late Pleistocene glacial cycles, or glacial isostatic adjustment (GIA), is a primary target of the GRACE satellite gravity mission. At the longest wavelengths, numerical simulations of the secular variation in the geopotential due to GIA exhibit a pronounced (degree two, order one) anomaly associated with so-called `rotational feedback'. That is, a perturbation in the geopotential arising from GIA-induced deflections in the Earth's rotation vector. The amplitude of the feedback signal is a function of the adopted Earth model and it has been the source of ongoing debate within the GIA literature. We revisit this issue using a new treatment of the equations governing load-induced rotation perturbations on spherically symmetric, viscoelastic Earth models. We demonstrate that previous estimates of the rotational feedback signal in present day rates of change of the geopotential (and also crustal velocities) have been significantly overestimated by the traditional rotation theory. This result has important implications for the analysis of secular trends constrained by the GRACE satellite mission.

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