Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/15702
Authors: Caricchi, Chiara* 
Campuzano, Saioa Arquero* 
Sagnotti, Leonardo* 
Macrì, Patrizia* 
Lucchi, Renata Giulia* 
Title: Reconstruction of the Virtual Geomagnetic Pole (VGP) path at high latitude for the last 22 kyr: The role of radial field flux patches as VGP attractor
Journal: Earth and Planetary Science Letters 
Series/Report no.: /595 (2022)
Publisher: Elsevier
Issue Date: 2022
DOI: 10.1016/j.epsl.2022.117762
Keywords: geomagnetic paleosecular variation
relative paleointensit
flux lobes
Levantine Iron Age Anomaly
marine sediment cores
arctic region
Subject Classificationsolid earth
paleomagnetism
Abstract: Reconstruction of geomagnetic field changes has a strong potential to complement geodynamo modeling and improve the understanding of Earth’s core dynamics. Recent works based on geomagnetic measure-ments pointed out that over the last two decades the position of the north magnetic pole has been largely determined by the influence of two competing flux lobes under Canada and Siberia. In order to understand if the waxing and waning of magnetic flux lobes have driven the path of geo-magnetic paleopoles in the past, we present an augmented and updated record of the chronology and paleosecular variation of geomagnetic field for the last 22 kyr derived from sedimentary cores collected along the north-western margin of Barents Sea and western margin of Spitsbergen (Arctic). The path of the virtual geomagnetic pole (VGP) has been reconstructed over this time period and compared with the maps of the radial component of the geomagnetic field at the core-mantle boundary, obtained from the most recent models. The VGP path includes centuries during which the VGP position is stable and cen-turies during which its motion accelerates. We recognize both clockwise and counterclockwise VGP paths, mostly developing inside the surface projection of the inner core tangent cylinder in the Arctic region. The VGP path seems to follow the appearance of Brpatches of normal magnetic flux, especially those located under Siberia and Canada areas, but also those that may cause peculiar paleomagnetic features such as the Levantine Iron Age Anomaly.
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Caricchi_et_al_2022.pdfRestricted Paper5.37 MBAdobe PDF
Caricchi_et_al_Manuscript.pdfPreprint version3.03 MBAdobe PDFView/Open
Supplementary_Material.pdfSupplementary material_Normalization method for relative paleointensity curves and models Figs. S1to S8.8.18 MBAdobe PDFView/Open
Table_S1_Cores information and age models.xlsxTable S1. Details of sedimentary cores (Spreadsheet 1), age models (Spreadsheet 2) and tie points (Spreadsheet 3).996.06 kBMicrosoft Excel XMLView/Open
Table_S2_FCF_global and Canadian-Siberian hemispheres.xlsxTable S2. Global Flux Concentration Factor (FCF) calculated for maps in Figs.7, 8, S7 and S8.10.83 kBMicrosoft Excel XMLView/Open
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