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Evidence for persistent 7000‐ and 3500‐year geomagnetic oscillations
Author(s) -
Southon John
Publication year - 2002
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2002gl014734
Subject(s) - earth's magnetic field , archaeomagnetic dating , geology , holocene , climatology , geophysics , atmospheric sciences , paleontology , physics , quantum mechanics , magnetic field
A 14,500‐year record of atmospheric 14 C contains evidence for 7000‐ and 3500‐ year oscillations. Since the Holocene archaeomagnetic record also contains features consistent with a 7000‐year cycle, a likely explanation is that the 14 C data are recording modulation of cosmogenic isotope production due to variations in geomagnetic shielding. A longer‐term 36 Cl record contains evidence for similar periodicities, suggesting that these geomagnetic variations may have been present for tens of millennia.