Drainage from water-filled crevasses along the margins of Jakobshavn Isbræ: A potential catalyst for catchment expansion

D. J. Lampkin, N. Amador, B. R. Parizek, K. Farness, K. Jezek

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Saturated crevasses occur in local depressions within the shear margins of Jakobshavn Isbræ at inflections in the ice stream's flow direction. Spatio-temporal variability of seven distinctive saturated crevasse groups was examined during the 2007 melt season. The area of saturated crevasses reached its maximum extent, ~1.8 km2, in early July, and remained largely constant until early August. Filling rates are correlated with regional melt production, while drainage rates are highly correlated with areal extent. Estimates on potential drainage volume from the largest crevasse system are ~9.23 × 10-3 km3 ± 2.15 × 10 -8 km3 and ~ 4.92 × 10-2 km3 ± 3.58 × 10-8 km3, respectively, over a 16 day interval and are more than required for a distributed basal hydrologic system across this area to temporarily flood bedrock obstacles believed to control basal sliding. Future drainage events, likely extending farther inland with warming, could result in enhanced lateral mass discharge into the ice stream, with implications for the dynamic evolution of the entire basin.

Original languageEnglish (US)
Pages (from-to)795-813
Number of pages19
JournalJournal of Geophysical Research: Earth Surface
Volume118
Issue number2
DOIs
StatePublished - Jun 1 2013

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

Fingerprint Dive into the research topics of 'Drainage from water-filled crevasses along the margins of Jakobshavn Isbræ: A potential catalyst for catchment expansion'. Together they form a unique fingerprint.

Cite this