EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Harmonic fluctuations in the relative paleointensity data?

Marcia Ernesto, Thamyris Britto, and George Caminha-Maciel
Marcia Ernesto et al.
  • Universidade de Sao Paulo, Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Geophysics, Sao Paulo, Brazil (

The existing relative paleointensity (RPI) database allowed the construction of reliable stacking curves for at least the last 1 Myr. Observed fluctuations in the RPI curves suggest both lithologic/climatic influence or geodynamo processes. Stacked power spectra for RPI data from ten North and South Atlantic cores revealed a spectral peak at ~5.3kyr for data covering the last 100 kyr. This signal exhibits a similar phase for most of the series. The observed spectral peak has no apparent correspondence in the benthic O18 spectra from the same cores, suggesting the RPI signal is free from the climatic influence. Therefore, it may be a real geodynamo feature.

How to cite: Ernesto, M., Britto, T., and Caminha-Maciel, G.: Harmonic fluctuations in the relative paleointensity data?, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-13406,, 2021.