Skip to main content
Publications | Persons | Institutes | Projects
[ report an error in this record ]basket (0): add | show Print this page

Earth's rotation: observations and relation to deep interior
Rekier, J.; Chao, B.F.; Chen, J.; Dehant, V.; Rosat, S.; Zhu, P. (2022). Earth's rotation: observations and relation to deep interior. Surveys in Geophysics 43(1): 149-175. https://dx.doi.org/10.1007/s10712-021-09669-x
In: Surveys in Geophysics. Kluwer Academic Publishers: Dordrecht; Tokyo; Lancaster; Boston. ISSN 0169-3298; e-ISSN 1573-0956, more
Peer reviewed article  

Available in  Authors 

Author keywords
    Earth's rotation; Polar motion; Length of day; Nutation; Observations

Authors  Top 
  • Rekier, J., more
  • Chao, B.F.
  • Chen, J.

Abstract
    Observation of the variations in the Earth's rotation at time scales ranging from subdiurnal to multidecadal allows us to learn about its deep interior structure. We review all three types of motion of the Earth's rotation axis: polar motion (PM), length of day variations (Delta LOD) and nutations, with particular attention to how the combination of geodetic, magnetic and gravity observations provides insight into the dynamics of the liquid core, including its interactions with the mantle. Models of the Earth's PM are able to explain most of the observed signal with the exception of the so-called Markowitz wobble. In addition, whereas the quasi-six year oscillations (SYO) observed in both Delta LOD and PM can be explained as the result of Atmosphere, Oceans and Hydrosphere Forcing (AOH) for PM, this is not true for Delta LOD where the subtraction of the AOH only makes the signal more visible. This points to a missing-possibly common-interpretation related to deep interior dynamics, the latter being also the most likely explanation of other oscillations in Delta LOD on interannual timescales. Deep Earth's structure and dynamics also have an impact on the nutations reflected in the values of the Basic Earth Parameters (BEP). We give a brief review of recent works aiming to independently evaluate the BEP and their implications for the study of deep interior dynamics.

All data in the Integrated Marine Information System (IMIS) is subject to the VLIZ privacy policy Top | Authors