Dynamic perennial firn aquifer on an Arctic glacier

Knut Christianson, Jack Kohler, Richard B. Alley, Christopher Nuth, Ward J.J. Van Pelt

Research output: Contribution to journalArticle

20 Scopus citations

Abstract

Ice-penetrating radar and GPS observations reveal a perennial firn aquifer (PFA) on a Svalbard ice field, similar to those recently discovered in southeastern Greenland. A bright, widespread radar reflector separates relatively dry and water-saturated firn. This surface, the phreatic firn water table, is deeper beneath local surface elevation maxima, shallower in surface lows, and steeper where the surface is steep. The reflector crosscuts snow stratigraphy; we use the apparent deflection of accumulation layers due to the higher dielectric permittivity below the water table to infer that the firn pore space becomes progressively more saturated as depth increases. Our observations indicate that PFAs respond rapidly (subannually) to surface forcing, and are capable of providing significant input to the englacial hydrology system.

Original languageEnglish (US)
Pages (from-to)1418-1426
Number of pages9
JournalGeophysical Research Letters
Volume42
Issue number5
DOIs
StatePublished - Mar 16 2015

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

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    Christianson, K., Kohler, J., Alley, R. B., Nuth, C., & Van Pelt, W. J. J. (2015). Dynamic perennial firn aquifer on an Arctic glacier. Geophysical Research Letters, 42(5), 1418-1426. https://doi.org/10.1002/2014GL062806