Grounding Line Retreat and Ice Discharge Variability at Two Surging, Ice Shelf‐Forming Basins of Flade Isblink Ice Cap, Northern Greenland
Ice discharge from Flade Isblink ice cap (NE Greenland) maintains an ice shelf at the northwestern fringe of the ice cap. The two outlet basins feeding this ice shelf surged during the late 1990s. Ice shelves are rare in Greenland and surges of ice shelf terminating glaciers even rarer. Understandin...
Published in: | Journal of Geophysical Research: Earth Surface |
---|---|
Main Authors: | , , , |
Format: | Other Non-Article Part of Journal/Newspaper |
Language: | unknown |
Published: |
Wiley
2022
|
Subjects: | |
Online Access: | https://elib.dlr.de/189818/ https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2021JF006302 |
id |
ftdlr:oai:elib.dlr.de:189818 |
---|---|
record_format |
openpolar |
spelling |
ftdlr:oai:elib.dlr.de:189818 2023-05-15T16:21:24+02:00 Grounding Line Retreat and Ice Discharge Variability at Two Surging, Ice Shelf‐Forming Basins of Flade Isblink Ice Cap, Northern Greenland Möller, Marco Friedl, Peter Palmer, Steven Marzeion, Ben 2022-02-06 https://elib.dlr.de/189818/ https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2021JF006302 unknown Wiley Möller, Marco und Friedl, Peter und Palmer, Steven und Marzeion, Ben (2022) Grounding Line Retreat and Ice Discharge Variability at Two Surging, Ice Shelf‐Forming Basins of Flade Isblink Ice Cap, Northern Greenland. Journal of Geophysical Research, 127 (2), Seiten 1-25. Wiley. doi:10.1029/2021JF006302 <https://doi.org/10.1029/2021JF006302>. ISSN 0148-0227. Internationales Bodensegment Zeitschriftenbeitrag PeerReviewed 2022 ftdlr https://doi.org/10.1029/2021JF006302 2022-11-14T00:13:42Z Ice discharge from Flade Isblink ice cap (NE Greenland) maintains an ice shelf at the northwestern fringe of the ice cap. The two outlet basins feeding this ice shelf surged during the late 1990s. Ice shelves are rare in Greenland and surges of ice shelf terminating glaciers even rarer. Understanding and explaining the evolution of ice mass changes in the two basins is hampered by a lack of knowledge about processes at their grounding zones. We determined, for the first time, the grounding line locations of these basins and analyzed their variability with time. We further quantified ice discharge and its variability during the period 1988–2020. We found that the grounding lines advanced slightly between 1993 and 1999 during the glacier surges, but showed overall retreats of 2.2 ± 1.3 km in basin 2 and 2.7 ± 0.9 km in basin 3 until 2019 over retrograde sloping beds. The retreats were promoted by increasing buoyancy forces due to increasing water depth, but opposing buttressing forces of the ice shelf induced a differing response of the grounding line in the two basins. Based on the observed patterns of flow and retreat, we characterized the surges as “Svalbard-type”, modified by buttressing effects of the ice shelf. We calculated total ice discharges over the study period of 1.85 ± 1.59 Gt in basin 2 and 1.38 ± 1.22 Gt in basin 3. We observed reductions in ice discharge of at least 90% after the surges, that persisted for the remainder of the period studied. Other Non-Article Part of Journal/Newspaper glacier glacier Greenland Ice cap Ice Shelf Ice Shelves Svalbard German Aerospace Center: elib - DLR electronic library Svalbard Greenland Flade Isblink ENVELOPE(-15.000,-15.000,81.583,81.583) Journal of Geophysical Research: Earth Surface 127 2 |
institution |
Open Polar |
collection |
German Aerospace Center: elib - DLR electronic library |
op_collection_id |
ftdlr |
language |
unknown |
topic |
Internationales Bodensegment |
spellingShingle |
Internationales Bodensegment Möller, Marco Friedl, Peter Palmer, Steven Marzeion, Ben Grounding Line Retreat and Ice Discharge Variability at Two Surging, Ice Shelf‐Forming Basins of Flade Isblink Ice Cap, Northern Greenland |
topic_facet |
Internationales Bodensegment |
description |
Ice discharge from Flade Isblink ice cap (NE Greenland) maintains an ice shelf at the northwestern fringe of the ice cap. The two outlet basins feeding this ice shelf surged during the late 1990s. Ice shelves are rare in Greenland and surges of ice shelf terminating glaciers even rarer. Understanding and explaining the evolution of ice mass changes in the two basins is hampered by a lack of knowledge about processes at their grounding zones. We determined, for the first time, the grounding line locations of these basins and analyzed their variability with time. We further quantified ice discharge and its variability during the period 1988–2020. We found that the grounding lines advanced slightly between 1993 and 1999 during the glacier surges, but showed overall retreats of 2.2 ± 1.3 km in basin 2 and 2.7 ± 0.9 km in basin 3 until 2019 over retrograde sloping beds. The retreats were promoted by increasing buoyancy forces due to increasing water depth, but opposing buttressing forces of the ice shelf induced a differing response of the grounding line in the two basins. Based on the observed patterns of flow and retreat, we characterized the surges as “Svalbard-type”, modified by buttressing effects of the ice shelf. We calculated total ice discharges over the study period of 1.85 ± 1.59 Gt in basin 2 and 1.38 ± 1.22 Gt in basin 3. We observed reductions in ice discharge of at least 90% after the surges, that persisted for the remainder of the period studied. |
format |
Other Non-Article Part of Journal/Newspaper |
author |
Möller, Marco Friedl, Peter Palmer, Steven Marzeion, Ben |
author_facet |
Möller, Marco Friedl, Peter Palmer, Steven Marzeion, Ben |
author_sort |
Möller, Marco |
title |
Grounding Line Retreat and Ice Discharge Variability at Two Surging, Ice Shelf‐Forming Basins of Flade Isblink Ice Cap, Northern Greenland |
title_short |
Grounding Line Retreat and Ice Discharge Variability at Two Surging, Ice Shelf‐Forming Basins of Flade Isblink Ice Cap, Northern Greenland |
title_full |
Grounding Line Retreat and Ice Discharge Variability at Two Surging, Ice Shelf‐Forming Basins of Flade Isblink Ice Cap, Northern Greenland |
title_fullStr |
Grounding Line Retreat and Ice Discharge Variability at Two Surging, Ice Shelf‐Forming Basins of Flade Isblink Ice Cap, Northern Greenland |
title_full_unstemmed |
Grounding Line Retreat and Ice Discharge Variability at Two Surging, Ice Shelf‐Forming Basins of Flade Isblink Ice Cap, Northern Greenland |
title_sort |
grounding line retreat and ice discharge variability at two surging, ice shelf‐forming basins of flade isblink ice cap, northern greenland |
publisher |
Wiley |
publishDate |
2022 |
url |
https://elib.dlr.de/189818/ https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2021JF006302 |
long_lat |
ENVELOPE(-15.000,-15.000,81.583,81.583) |
geographic |
Svalbard Greenland Flade Isblink |
geographic_facet |
Svalbard Greenland Flade Isblink |
genre |
glacier glacier Greenland Ice cap Ice Shelf Ice Shelves Svalbard |
genre_facet |
glacier glacier Greenland Ice cap Ice Shelf Ice Shelves Svalbard |
op_relation |
Möller, Marco und Friedl, Peter und Palmer, Steven und Marzeion, Ben (2022) Grounding Line Retreat and Ice Discharge Variability at Two Surging, Ice Shelf‐Forming Basins of Flade Isblink Ice Cap, Northern Greenland. Journal of Geophysical Research, 127 (2), Seiten 1-25. Wiley. doi:10.1029/2021JF006302 <https://doi.org/10.1029/2021JF006302>. ISSN 0148-0227. |
op_doi |
https://doi.org/10.1029/2021JF006302 |
container_title |
Journal of Geophysical Research: Earth Surface |
container_volume |
127 |
container_issue |
2 |
_version_ |
1766009404151300096 |