The precession constant and its long-term variation

This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.1016/j.icarus.2020.114172. This is version 2 of this Preprint.

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Authors

Siavash Ghelichkhan, Jocelyn Fuentes, Mark Hoggard , Fred Richards, Jerry X Mitrovica

Abstract

The dynamical flattening of the Earth, H, related to the precession constant, is a fundamental astro-geodetic parameter that appears in studies of the Earth's rotation and orbital evolution. We present numerical predictions and observations of the variation in H over time scales ranging from tens of millions of years to decades. The geophysical processes controlling this variation include solid-state convection in the rocky mantle of the Earth that drives plate tectonics, isostatic adjustments due to ice age loading, and ice-ocean mass transfer linked to modern global climate change. The time dependence of H is complex and non-linear, and thus, in contrast to previous suggestions, cannot be captured by a constant rate parameter.

DOI

https://doi.org/10.31223/X58C8Q

Subjects

Astrophysics and Astronomy, Earth Sciences, Physical Sciences and Mathematics, Planetary Sciences

Keywords

Earth rotation, Precession constant, Dynamical flattening

Dates

Published: 2020-12-08 17:46

Last Updated: 2021-03-11 22:52

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License

CC BY Attribution 4.0 International

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