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Geomagnetic Modulation of the 36Cl Flux in the GRIP Ice Core, Greenland

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Science  27 Feb 1998:
Vol. 279, Issue 5355, pp. 1330-1332
DOI: 10.1126/science.279.5355.1330

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Abstract

Geomagnetic field strength is expected to affect the production rate of cosmogenic isotopes such as beryllium-10, carbon-14, or chlorine-36. Chlorine-36 data from the Greenland Ice Core Project (GRIP) ice core agree well with a production rate calculation based on a paleomagnetic reconstruction for the past 100,000 years over both long- and short-term variations. A chlorine-36 peak at 38,000 years ago previously found in the beryllium-10 record from the Vostok ice core can be explained by a period of low geomagnetic field intensity.

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