Evidence of high cosmic dust concentrations in late Pleistocene polar ice (20,000-14,000 years BP)

Details Evidence of high cosmic dust concentrations in late Pleistocene polar ice (20,000-14,000 years BP) Evidence of high cosmic dust concentrations in late Pleistocene polar ice (20,000-14,000 years BP)

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985metic..20..545l&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 20, Sept. 30, 1985, p. 545-558. Research supported by the University of Missouri, Reed Colleg

Computer Science

6

Abundance, Climate, Cosmic Dust, Ice, Interplanetary Medium, Solar System, Chemical Analysis, Light Scattering

Scientific paper

The cosmic dust concentration in the solar system during the last ice age was investigated by means of eight samples from 1215-1279 m depth in the Camp Century ice core. Neutron activation analysis was applied to measure the Ir and Ni concentrations. The study was carried out to test the hypothesis that sudden cosmic dust enrichments in the solar system may have attenuated sunlight sufficiently to cause the ice ages. The cosmic dust concentrations were compared to concentrations up in ocean core samples from the same epoch. The data indicate that five instances of several orders of magnitude increases in the cosmic dust abundance occurred during the period 20,000-14,000 BP. The particles were small enough to have caused, in dispersion, significant alterations in the amount of sunlight reaching the earth.

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