Bed elevation of Jakobshavn Isbræ, West Greenland, from high-resolution airborne gravity and other data

L. An, E. Rignot, S. Elieff, M. Morlighem, R. Millan, J. Mouginot, D. M. Holland, D. Holland, J. Paden

Research output: Contribution to journalArticle

Abstract

Jakobshavn Isbræ, West Greenland, which holds a 0.6 m sea level volume equivalent, has been speeding up and retreating since the late 1990s. Interpretation of its retreat has been hindered by difficulties in measuring its ice thickness with airborne radar depth sounders. Here we employ high-resolution, helicopter-borne gravity data from 2012 to reconstruct its bed elevation within 50 km of the ocean margin using a three-dimensional inversion constrained by fjord bathymetry data offshore and a mass conservation algorithm inland. We find the glacier trough to be asymmetric and several 100 m deeper than estimated previously in the lower part. From 1996 to 2016, the grounding line migrated at 0.6 km/yr from 700 m to 1100 m depth. Upstream, the bed drops to 1600 m over 10 km then slowly climbs to 1200 m depth in 40 km. Jakobshavn Isbræ will continue to retreat along a retrograde slope for decades to come.

Original languageEnglish (US)
JournalGeophysical Research Letters
DOIs
StateAccepted/In press - 2017

Fingerprint

Greenland
beds
gravity
gravitation
high resolution
airborne radar
grounding line
glaciers
bathymeters
helicopters
ice thickness
fjord
sounding
sea level
troughs
bathymetry
upstream
conservation
margins
oceans

Keywords

  • Bathymetry
  • Gravity
  • Greenland
  • Mass balance
  • Remote sensing

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

An, L., Rignot, E., Elieff, S., Morlighem, M., Millan, R., Mouginot, J., ... Paden, J. (Accepted/In press). Bed elevation of Jakobshavn Isbræ, West Greenland, from high-resolution airborne gravity and other data. Geophysical Research Letters. https://doi.org/10.1002/2017GL073245

Bed elevation of Jakobshavn Isbræ, West Greenland, from high-resolution airborne gravity and other data. / An, L.; Rignot, E.; Elieff, S.; Morlighem, M.; Millan, R.; Mouginot, J.; Holland, D. M.; Holland, D.; Paden, J.

In: Geophysical Research Letters, 2017.

Research output: Contribution to journalArticle

An, L. ; Rignot, E. ; Elieff, S. ; Morlighem, M. ; Millan, R. ; Mouginot, J. ; Holland, D. M. ; Holland, D. ; Paden, J. / Bed elevation of Jakobshavn Isbræ, West Greenland, from high-resolution airborne gravity and other data. In: Geophysical Research Letters. 2017.
@article{9fb244ad3a684601ac3f0235c044c9bc,
title = "Bed elevation of Jakobshavn Isbr{\ae}, West Greenland, from high-resolution airborne gravity and other data",
abstract = "Jakobshavn Isbr{\ae}, West Greenland, which holds a 0.6 m sea level volume equivalent, has been speeding up and retreating since the late 1990s. Interpretation of its retreat has been hindered by difficulties in measuring its ice thickness with airborne radar depth sounders. Here we employ high-resolution, helicopter-borne gravity data from 2012 to reconstruct its bed elevation within 50 km of the ocean margin using a three-dimensional inversion constrained by fjord bathymetry data offshore and a mass conservation algorithm inland. We find the glacier trough to be asymmetric and several 100 m deeper than estimated previously in the lower part. From 1996 to 2016, the grounding line migrated at 0.6 km/yr from 700 m to 1100 m depth. Upstream, the bed drops to 1600 m over 10 km then slowly climbs to 1200 m depth in 40 km. Jakobshavn Isbr{\ae} will continue to retreat along a retrograde slope for decades to come.",
keywords = "Bathymetry, Gravity, Greenland, Mass balance, Remote sensing",
author = "L. An and E. Rignot and S. Elieff and M. Morlighem and R. Millan and J. Mouginot and Holland, {D. M.} and D. Holland and J. Paden",
year = "2017",
doi = "10.1002/2017GL073245",
language = "English (US)",
journal = "Geophysical Research Letters",
issn = "0094-8276",
publisher = "American Geophysical Union",

}

TY - JOUR

T1 - Bed elevation of Jakobshavn Isbræ, West Greenland, from high-resolution airborne gravity and other data

AU - An, L.

AU - Rignot, E.

AU - Elieff, S.

AU - Morlighem, M.

AU - Millan, R.

AU - Mouginot, J.

AU - Holland, D. M.

AU - Holland, D.

AU - Paden, J.

PY - 2017

Y1 - 2017

N2 - Jakobshavn Isbræ, West Greenland, which holds a 0.6 m sea level volume equivalent, has been speeding up and retreating since the late 1990s. Interpretation of its retreat has been hindered by difficulties in measuring its ice thickness with airborne radar depth sounders. Here we employ high-resolution, helicopter-borne gravity data from 2012 to reconstruct its bed elevation within 50 km of the ocean margin using a three-dimensional inversion constrained by fjord bathymetry data offshore and a mass conservation algorithm inland. We find the glacier trough to be asymmetric and several 100 m deeper than estimated previously in the lower part. From 1996 to 2016, the grounding line migrated at 0.6 km/yr from 700 m to 1100 m depth. Upstream, the bed drops to 1600 m over 10 km then slowly climbs to 1200 m depth in 40 km. Jakobshavn Isbræ will continue to retreat along a retrograde slope for decades to come.

AB - Jakobshavn Isbræ, West Greenland, which holds a 0.6 m sea level volume equivalent, has been speeding up and retreating since the late 1990s. Interpretation of its retreat has been hindered by difficulties in measuring its ice thickness with airborne radar depth sounders. Here we employ high-resolution, helicopter-borne gravity data from 2012 to reconstruct its bed elevation within 50 km of the ocean margin using a three-dimensional inversion constrained by fjord bathymetry data offshore and a mass conservation algorithm inland. We find the glacier trough to be asymmetric and several 100 m deeper than estimated previously in the lower part. From 1996 to 2016, the grounding line migrated at 0.6 km/yr from 700 m to 1100 m depth. Upstream, the bed drops to 1600 m over 10 km then slowly climbs to 1200 m depth in 40 km. Jakobshavn Isbræ will continue to retreat along a retrograde slope for decades to come.

KW - Bathymetry

KW - Gravity

KW - Greenland

KW - Mass balance

KW - Remote sensing

UR - http://www.scopus.com/inward/record.url?scp=85018958836&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85018958836&partnerID=8YFLogxK

U2 - 10.1002/2017GL073245

DO - 10.1002/2017GL073245

M3 - Article

AN - SCOPUS:85018958836

JO - Geophysical Research Letters

JF - Geophysical Research Letters

SN - 0094-8276

ER -