Geomagnetic Strength Over the Last 50,000 Years and Changes in Atmospheric 14 C Concentration

Palaeomagnetic field strength measurements for the last 50,000 years are summarized. The period before ~12,000 yr bp is characterized by low dipole moments, but high values are associated with the Lake Mungo polarity excursion between ~32,000 and ~28,000 yr bp. The variation since 12,000 yr bp, based on new results from Australia and published data from the Northern Hemisphere has a quasi-cyclic appearance with maxima at ~10,000 and ~3500 yr bp. The geomagnetic record is used to predict variations in atmospheric 14 C concentration, and the results are compared with independent comparisons between 14 C and other dating methods. Long-term variations in the 14 C time-scale are readily explained by known geomagnetic changes

Atmospheric sciences · Climatology · Earth's magnetic field · Excursion · Geomagnetic secular variation · Geomagnetic storm · Magnetic field · Maxima · Northern Hemisphere · Physics · Radiocarbon dating · Secular variation · Southern Hemisphere · Geology and Paleoclimatology Research · Geomagnetism and Paleomagnetism Studies · Planetary Science and Exploration · Geology · Geophysics · Paleontology

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