Paleomagnetic evidence for long-term (10,000 year) memory and periodic behavior in the earth's core dynamo process

Details Paleomagnetic evidence for long-term (10,000 year) memory and periodic behavior in the earth's core dynamo process Paleomagnetic evidence for long-term (10,000 year) memory and periodic behavior in the earth's core dynamo process

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988georl..15.1101l&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 15, Sept. 1988, p. 1101-1104.

Physics

36

Dynamo Theory, Earth Core, Geomagnetism, Paleomagnetism, Secular Variations, Magnetic Measurement, Southern California, Waveforms

Scientific paper

A new paleomagnetic secular variation (PSV) record from the late Quaternary Wilson Creek beds of Mono Lake, California contains a distinctive periodic vector waveform that follows and is almost certainly related to the Mono Lake excursion. A comparison of all published PSV results from the Wilson Creek beds suggests that the magnetic field at Mono Lake went through an interval (36,000-28,000 ybp) of very low amplitude PSV followed by the Mono Lake excursion (28,000-27,000 ybp) and four subsequent recurrences (27,000-12,500 ybp) of the excursion waveform with relatively diminished amplitudes (lower than the excursion amplitude but higher than PSV amplitudes at Mono Lake since 12,500 ybp). This pattern clearly suggests that the Mono Lake excursion is related to 'typical' PSV; it also suggests that the core dynamo process responsible for PSV is capable of near impulse onset, persistence over a time scale of 15,000 years, and quasi-periodic behavior that is nonwavelength dispersive in time.

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