Wavelet analysis on paleomagnetic (and computer simulated) VGP time series
We present Continuous Wavelet Transform (CWT) data analysis of Virtual Geomagnetic Pole (VGP) latitude time series. The analyzed time series are sedimentary paleomagnetic and geodynamo simulated data. Two mother wavelets (the Morlet function and the first derivative of a Gaussian function) are used...
Published in: | Annals of Geophysics |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
2003
|
Subjects: | |
Online Access: | https://doi.org/10.4401/ag-3429 https://doaj.org/article/aed012c82a654338b76742a453162eb1 |
id |
ftdoajarticles:oai:doaj.org/article:aed012c82a654338b76742a453162eb1 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:aed012c82a654338b76742a453162eb1 2023-05-15T16:19:40+02:00 Wavelet analysis on paleomagnetic (and computer simulated) VGP time series A. Siniscalchi G. Giberti S. Lorito M. Iorio 2003-06-01T00:00:00Z https://doi.org/10.4401/ag-3429 https://doaj.org/article/aed012c82a654338b76742a453162eb1 EN eng Istituto Nazionale di Geofisica e Vulcanologia (INGV) http://www.annalsofgeophysics.eu/index.php/annals/article/view/3429 https://doaj.org/toc/1593-5213 https://doaj.org/toc/2037-416X doi:10.4401/ag-3429 1593-5213 2037-416X https://doaj.org/article/aed012c82a654338b76742a453162eb1 Annals of Geophysics, Vol 46, Iss 3 (2003) CWT VGP geodynamo simulations excursions and reversals Earth's orbital parameters Meteorology. Climatology QC851-999 Geophysics. Cosmic physics QC801-809 article 2003 ftdoajarticles https://doi.org/10.4401/ag-3429 2022-12-30T22:53:39Z We present Continuous Wavelet Transform (CWT) data analysis of Virtual Geomagnetic Pole (VGP) latitude time series. The analyzed time series are sedimentary paleomagnetic and geodynamo simulated data. Two mother wavelets (the Morlet function and the first derivative of a Gaussian function) are used in order to detect features related to the spectral content as well as polarity excursions and reversals. By means of the Morlet wavelet, we estimate both the global spectrum and the time evolution of the spectral content of the paleomagnetic data series. Some peaks corresponding to the orbital components are revealed by the spectra and the local analysis helped disclose their statistical significance. Even if this feature could be an indication of orbital influence on geodynamo, other interpretations are possible. In particular, we note a correspondence of local spectral peaks with the appearance of the excursions in the series. The comparison among the paleomagnetic and simulated spectra shows a similarity in the high frequency region indicating that their degree of regularity is analogous. By means of Gaussian first derivative wavelet, reversals and excursions of polarity were sought. The analysis was performed first on the simulated data, to have a guide in understanding the features present in the more complex paleomagnetic data. Various excursions and reversals have been identified, despite of the prevalent normality of the series and its inherent noise. The found relative chronology of the paleomagnetic data reversals was compared with a coeval global polarity time scale (Channel et al., 1995). The relative lengths of polarity stability intervals are found similar, but a general shift appears between the two scales, that could be due to the datation uncertainties of the Hauterivian/Barremian boundary. Article in Journal/Newspaper Geomagnetic Pole Directory of Open Access Journals: DOAJ Articles Annals of Geophysics 46 3 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
CWT VGP geodynamo simulations excursions and reversals Earth's orbital parameters Meteorology. Climatology QC851-999 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
CWT VGP geodynamo simulations excursions and reversals Earth's orbital parameters Meteorology. Climatology QC851-999 Geophysics. Cosmic physics QC801-809 A. Siniscalchi G. Giberti S. Lorito M. Iorio Wavelet analysis on paleomagnetic (and computer simulated) VGP time series |
topic_facet |
CWT VGP geodynamo simulations excursions and reversals Earth's orbital parameters Meteorology. Climatology QC851-999 Geophysics. Cosmic physics QC801-809 |
description |
We present Continuous Wavelet Transform (CWT) data analysis of Virtual Geomagnetic Pole (VGP) latitude time series. The analyzed time series are sedimentary paleomagnetic and geodynamo simulated data. Two mother wavelets (the Morlet function and the first derivative of a Gaussian function) are used in order to detect features related to the spectral content as well as polarity excursions and reversals. By means of the Morlet wavelet, we estimate both the global spectrum and the time evolution of the spectral content of the paleomagnetic data series. Some peaks corresponding to the orbital components are revealed by the spectra and the local analysis helped disclose their statistical significance. Even if this feature could be an indication of orbital influence on geodynamo, other interpretations are possible. In particular, we note a correspondence of local spectral peaks with the appearance of the excursions in the series. The comparison among the paleomagnetic and simulated spectra shows a similarity in the high frequency region indicating that their degree of regularity is analogous. By means of Gaussian first derivative wavelet, reversals and excursions of polarity were sought. The analysis was performed first on the simulated data, to have a guide in understanding the features present in the more complex paleomagnetic data. Various excursions and reversals have been identified, despite of the prevalent normality of the series and its inherent noise. The found relative chronology of the paleomagnetic data reversals was compared with a coeval global polarity time scale (Channel et al., 1995). The relative lengths of polarity stability intervals are found similar, but a general shift appears between the two scales, that could be due to the datation uncertainties of the Hauterivian/Barremian boundary. |
format |
Article in Journal/Newspaper |
author |
A. Siniscalchi G. Giberti S. Lorito M. Iorio |
author_facet |
A. Siniscalchi G. Giberti S. Lorito M. Iorio |
author_sort |
A. Siniscalchi |
title |
Wavelet analysis on paleomagnetic (and computer simulated) VGP time series |
title_short |
Wavelet analysis on paleomagnetic (and computer simulated) VGP time series |
title_full |
Wavelet analysis on paleomagnetic (and computer simulated) VGP time series |
title_fullStr |
Wavelet analysis on paleomagnetic (and computer simulated) VGP time series |
title_full_unstemmed |
Wavelet analysis on paleomagnetic (and computer simulated) VGP time series |
title_sort |
wavelet analysis on paleomagnetic (and computer simulated) vgp time series |
publisher |
Istituto Nazionale di Geofisica e Vulcanologia (INGV) |
publishDate |
2003 |
url |
https://doi.org/10.4401/ag-3429 https://doaj.org/article/aed012c82a654338b76742a453162eb1 |
genre |
Geomagnetic Pole |
genre_facet |
Geomagnetic Pole |
op_source |
Annals of Geophysics, Vol 46, Iss 3 (2003) |
op_relation |
http://www.annalsofgeophysics.eu/index.php/annals/article/view/3429 https://doaj.org/toc/1593-5213 https://doaj.org/toc/2037-416X doi:10.4401/ag-3429 1593-5213 2037-416X https://doaj.org/article/aed012c82a654338b76742a453162eb1 |
op_doi |
https://doi.org/10.4401/ag-3429 |
container_title |
Annals of Geophysics |
container_volume |
46 |
container_issue |
3 |
_version_ |
1766006083822813184 |