Jakobshavn Glacier Bed Elevation
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-resolut...
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ftzenodo:oai:zenodo.org:5012721 2023-05-15T16:21:14+02:00 Jakobshavn Glacier Bed Elevation An, Lu 2018-03-23 https://zenodo.org/record/5012721 https://doi.org/10.7280/D1J37Z unknown https://zenodo.org/communities/dryad https://zenodo.org/record/5012721 https://doi.org/10.7280/D1J37Z oai:zenodo.org:5012721 info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/legalcode info:eu-repo/semantics/other dataset 2018 ftzenodo https://doi.org/10.7280/D1J37Z 2023-03-10T14:30:34Z 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 1996-2016, the grounding line migrated at 0.6 km/yr from 700 m to 1,100 m depth. Upstream, the bed drops to 1,600 m over 10 km then slowly climbs to 1,200 m depth in 40 km. Jakobshavn Isbræ will continue to retreat along a retrograde slope for decades to come. An L., E. Rignot, S.H.P. Elieff, M. Morlighem, R. Millan, J. Mouginot, D.M. Holland, D. Holland, and J. Paden (2017), Bed elevation of Jakobshavn Isbræ, West Greenland, from high-resolution airborne gravity and other data, Geophys. Res. Lett., 44, doi:10.1002/2017GL073245. Dataset glacier Greenland Jakobshavn Jakobshavn isbræ Zenodo Greenland Jakobshavn Isbræ ENVELOPE(-49.917,-49.917,69.167,69.167) |
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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 1996-2016, the grounding line migrated at 0.6 km/yr from 700 m to 1,100 m depth. Upstream, the bed drops to 1,600 m over 10 km then slowly climbs to 1,200 m depth in 40 km. Jakobshavn Isbræ will continue to retreat along a retrograde slope for decades to come. An L., E. Rignot, S.H.P. Elieff, M. Morlighem, R. Millan, J. Mouginot, D.M. Holland, D. Holland, and J. Paden (2017), Bed elevation of Jakobshavn Isbræ, West Greenland, from high-resolution airborne gravity and other data, Geophys. Res. Lett., 44, doi:10.1002/2017GL073245. |
format |
Dataset |
author |
An, Lu |
spellingShingle |
An, Lu Jakobshavn Glacier Bed Elevation |
author_facet |
An, Lu |
author_sort |
An, Lu |
title |
Jakobshavn Glacier Bed Elevation |
title_short |
Jakobshavn Glacier Bed Elevation |
title_full |
Jakobshavn Glacier Bed Elevation |
title_fullStr |
Jakobshavn Glacier Bed Elevation |
title_full_unstemmed |
Jakobshavn Glacier Bed Elevation |
title_sort |
jakobshavn glacier bed elevation |
publishDate |
2018 |
url |
https://zenodo.org/record/5012721 https://doi.org/10.7280/D1J37Z |
long_lat |
ENVELOPE(-49.917,-49.917,69.167,69.167) |
geographic |
Greenland Jakobshavn Isbræ |
geographic_facet |
Greenland Jakobshavn Isbræ |
genre |
glacier Greenland Jakobshavn Jakobshavn isbræ |
genre_facet |
glacier Greenland Jakobshavn Jakobshavn isbræ |
op_relation |
https://zenodo.org/communities/dryad https://zenodo.org/record/5012721 https://doi.org/10.7280/D1J37Z oai:zenodo.org:5012721 |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/legalcode |
op_doi |
https://doi.org/10.7280/D1J37Z |
_version_ |
1766009246095245312 |