Geomagnetic paleointensity variation with a 100 kyr quasi-period

Details Geomagnetic paleointensity variation with a 100 kyr quasi-period Geomagnetic paleointensity variation with a 100 kyr quasi-period

Aug 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000e%26psl.181....7y&link_type=abstract

Earth and Planetary Science Letters, Volume 181, Issue 1-2, p. 7-14.

Physics

14

Scientific paper

We analyzed records of geomagnetic field intensity (paleointensity) during the last 700 kyr in five sediment cores from a wide region of the Pacific Ocean. A global paleointensity variation with a 100 kyr quasi-period was successfully extracted using the wavelet transform. Because the variation does not correlate with that of magnetic properties of the sediments, it originated from a change in the geomagnetic field. The 100 kyr quasi-period of the geomagnetic field is close to the timescales of eccentricity, one of the Earth's orbital elements, and of the glacial-interglacial cycle of the late Quaternary paleoclimate. In particular, there is a correlation between the variations of the geomagnetic field intensity and climate with an 18 kyr time lag. While the geodynamo has widely been thought to be a self-sustained system, our results support the possibility of an external energy supply of the variation through orbital forcing or climate change.

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