Long-wavelength optical logging for high-resolution detection of ash layers in glacier ice

Wing S. Chan, Merlin L. Mah, Ryan C. Bay, Joseph J. Talghader

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

A new instrument for high-resolution optical logging has been built and tested in Antarctica. Its purpose is to obtain records of volcanic products and other scattering features, such as bubbles and impurities, preserved in polar ice sheets, and it achieves this by using long wavelength near-infrared light that is absorbed by the ice before many scattering events occur. Longer wavelengths ensure that the return signal is composed primarily of a single or few backscattering event(s) that limit its spatial spread. The compact optical logger features no components on its body that draw power, which minimizes its size and weight. A prototype of the logger was built and tested at Siple Dome A borehole, and the results were correlated with prior optical logging profiles and records of volcanic products from collected ice core samples.

Original languageEnglish (US)
Pages (from-to)17-21
Number of pages5
JournalJournal of Glaciology
Volume63
Issue number237
DOIs
StatePublished - Feb 1 2017

Bibliographical note

Publisher Copyright:
© The Author(s) 2016.

Keywords

  • Antarctica
  • ash
  • borehole logging
  • instrumentation
  • optics

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