A geomagnetic chronology for antarctic ice accumulation

Details A geomagnetic chronology for antarctic ice accumulation A geomagnetic chronology for antarctic ice accumulation

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21..337m&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 5, p. 337-340

Mathematics

Logic

33

Antarctic Regions, Beryllium Isotopes, Geochronology, Geomagnetism, Ice, Cosmic Rays, Magnetic Fields, Paleomagnetism

Scientific paper

The curve of Be-10 flux versus age in the Vostok ice core largely covaries with a synthetic curve calculated assuming that a large fraction of Be-10 production rate is modulated by changes in the geomagnetic field intensity. With this assumption, it is also possible to derive a precise chronology for the Vostok core. This chronology is in good agreement with a very recent glaciological chronology obtained for Vostok ice core, and improves the correspondence of climate events recorded in Antarctic ice with correlative events recorded in deep sea sediments. Therefore, the idea that changes in the Be-10 flux at Vostok may arise from variations in Earth's geomagnetic dipole field has to be seriously considered. This would imply that a large portion of the Be-10 deposited there is derived from lower latitudes.

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