30,000 years of cosmic dust in Antarctic ice.
Polar ice provides an archive for the influx of cosmic dust. Here, we present a high-resolution, glacial-to-interglacial record of cosmic dust using helium isotope analysis of the European Project for Ice Coring in Antarctica (EPICA) ice core drilled in Dronning Maud Land. We obtained a relatively constant 3He flux over the past 30,000 years. This finding excludes 3He as a pacemaker of late Pleistocene glacial cycles. Rather, it supports 3He as a constant flux parameter in paleoclimatic studies. A last glacial-to-Holocene shift of the 4He/non-sea salt Ca2+ ratio appears to indicate a glacial-to-interglacial change in the terrestrial dust source.
Winckler
Gisela
G
Lamont-Doherty Earth Observatory (L-DEO), Earth Institute at Columbia University, Palisades, NY 10964, USA. winckler@ldeo.columbia.edu
Fischer
Hubertus
H