Proxies and measurement techniques for mineral dust in Antarctic ice cores

Environ Sci Technol. 2008 Aug 1;42(15):5675-81. doi: 10.1021/es703078z.

Abstract

To improve quantitative interpretation of ice core aeolian dust records, a systematic methodological comparison was made. This involved methods for water-insoluble particle counting (Coulter counter and laser-sensing particle detector), soluble ion analysis (ion chromatography and continuous flow analysis), elemental analysis (inductively coupled plasma mass spectroscopy at pH 1 and after full acid digestion), and water-insoluble elemental analysis (proton induced X-ray emission). Antarctic ice core samples covering the last deglaciation from the EPICA Dome C (EDC) and the EPICA Dronning Maud Land (EDML) cores were used. All methods correlate very well among each other, but the ratios of glacial age to Holocene concentrations, which are typically a factor approximately 100, differ between the methods by up to a factor of 2 with insoluble particles showing the largest variability. The recovery of ICP-MS measurements depends on the digestion method and is differentfor different elements and during different climatic periods. EDC and EDML samples have similar dust composition, which suggests a common dust source or a common mixture of sources for the two sites. The analyzed samples further reveal a change of dust composition during the last deglaciation.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antarctic Regions
  • Dust / analysis*
  • Environmental Monitoring / instrumentation
  • Environmental Monitoring / methods*
  • Environmental Pollutants / analysis*
  • Ice / analysis*
  • Inhalation Exposure*
  • Mass Spectrometry / methods*
  • Minerals / analysis*
  • Particle Size
  • Time Factors

Substances

  • Dust
  • Environmental Pollutants
  • Ice
  • Minerals