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Grounding Line Retreat and Ice Discharge Variability at Two Surging, Ice Shelf‐Forming Basins of Flade Isblink Ice Cap, Northern Greenland

Möller, Marco and Friedl, Peter and Palmer, Steven and 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: Earth Surface, 127 (2), pp. 1-25. Wiley. doi: 10.1029/2021JF006302. ISSN 2169-9003.

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Official URL: https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2021JF006302

Abstract

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.

Item URL in elib:https://elib.dlr.de/190440/
Document Type:Article
Title:Grounding Line Retreat and Ice Discharge Variability at Two Surging, Ice Shelf‐Forming Basins of Flade Isblink Ice Cap, Northern Greenland
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Möller, MarcoUNSPECIFIEDhttps://orcid.org/0000-0002-4503-0989UNSPECIFIED
Friedl, PeterUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Palmer, StevenDepartment of Geography, University of Exeter, Exeter, UKhttps://orcid.org/0000-0003-3977-8509UNSPECIFIED
Marzeion, BenInstitute of Geography, University of Bremen, Bremen, Germanyhttps://orcid.org/0000-0002-6185-3539UNSPECIFIED
Date:6 February 2022
Journal or Publication Title:Journal of Geophysical Research: Earth Surface
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:127
DOI:10.1029/2021JF006302
Page Range:pp. 1-25
Publisher:Wiley
ISSN:2169-9003
Status:Published
Keywords:Grounding Line, Remote Sensing, Radar, Flade Isblink, Glacier Velocity, Sentinel-1
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - HPDA use
Location: Oberpfaffenhofen
Institutes and Institutions:German Remote Sensing Data Center > International Ground Segment
Deposited By: Friedl, Peter
Deposited On:22 Nov 2022 19:56
Last Modified:11 Dec 2023 09:11

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