Intelligent Earth system sensing, scientific enquiry and discovery


Excitation of Free Core Nutation by geophysical fluids

Xiaoming Cui, Heping Sun, Jianqiao Xu
Institute of Geodesy and Geophysics. Chinese Academy of Sciences
Oral presentation

The Earth’s free core nutation (FCN) is a rotation mode sourced of core-mantle boundary. The observed FCN signal from VLBI measurements shows apparent fluctuations in period, phase and amplitude. We study the excitation of FCN by the atmospheric and oceanic Effective Angular Momentum Functions time series from different geophysical models. And part of Hydrological Angular Momentum Functions is considered. Compared with the observed FCN, the excited signal shows different consistency over time. The contribution of different geophysical fluids is also discussed. 

Scientific Topic: 
Variations in Earth rotation (Harald Schuh, Richard Gross)
Presentation date time: 
Wednesday, June 8, 2016 - 09:30 to 09:45