AI Article Synopsis
- Polar ice serves as a record of cosmic dust accumulation, examined through helium isotope analysis from an Antarctic ice core.
- The study found a steady influx of 3He over the last 30,000 years, suggesting it does not influence glacial cycles, but rather remains constant in paleoclimate research.
- A comparison of 4He to non-sea salt Ca2+ ratios hints at changes in the source of terrestrial dust from glacial to interglacial periods.
Article Abstract
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.
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| http://dx.doi.org/10.1126/science.1127469 | DOI Listing |
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