Carrivick, Jonathan L, How, Penelope, Lea, James M, Sutherland, Jenna L, Grimes, Michael, Tweed, Fiona S, Cornford, Stephen, Quincey, Duncan J and Mallalieu, Joseph
ORCID: https://orcid.org/0000-0002-1988-8594
(2022)
Ice-marginal proglacial lakes across Greenland: present status and a possible future.
Geophysical Research Letters, 49 (12).
e2022GL099276.
ISSN 0094-8276
Abstract
Ice-marginal lakes can affect glacier dynamics but are ignored in studies of the evolution of the Greenland ice sheet (GrIS) and of peripheral mountain glaciers and ice caps (PGICs). Here we show that lakes occupy 10% of the GrIS ice margin and occur on 5% of PGICs. Ice velocity at the GrIS margin is enhanced by ∼ 25% at lakes versus on land. Mean ice discharge into lakes is ∼4.9 Gt.yr, which is ∼1% of ice discharged through marine termini. We locate thousands of subglacial overdeepenings within which 7,404 km2 of future lakes could form, all of which will be ice-marginal at some time. Future lakes in the west and east will be restricted to the margin of the GrIS and within alpine valleys, respectively. This status and possible future leads us to contend that lakes should be incorporated into projections of Greenland ice loss.
Item Type: |
Article
|
Peer-reviewed: |
Yes
|
Date Deposited: |
16 Jan 2023 08:41
|
Publisher: |
American Geophysical Union |
Additional Information: |
This is an Open Access article which appeared in Geophysical Research Letters. |
Divisions: |
Faculties > Science and Engineering |
Subject terms: |
Science & Technology, Physical Sciences, Geosciences, Multidisciplinary, Geology, Greenland, ice sheet, glacier, lake, meltwater, proglacial, LAND-TERMINATING GLACIERS, WEST GREENLAND, SHEET, RHONEGLETSCHER, ACCELERATION, DISCHARGE, TERMINUS, CLIMATE, FLOW, Meteorology & Atmospheric Sciences |
Data Access Statement: |
Ice-marginal lakes are available from How et al. (2021). https://catalogue.ceda.ac.uk/uuid/7ea7540135f441369716ef867d217519. Greenland ice sheet catchments are available from Mouginot and Rignot (2019) http://doi.org/10.7280/D1WT11. Hydrological catchments of the GrIS are available from Mankoff, Noël et al. (2019) https://dataverse01.geus.dk/dataverse/freshwater. A Greenland coastline is available from Gerrish (2020) http://doi.org/10.5285/8CECDE06-8474-4B58-A9CB-B820FA4C9429. PGICs are available from RGI v6 obtained from GLIMS (2021; Raup et al., 2007) http://glims.colorado.edu/glacierdata/. Annual ice velocity grids are available from Joughin (2020) https://nsidc.org/data/nsidc-0725/versions/2. Ice surface elevation, ice thickness, ice sheet bed topography from BedMachine v4 (Morlighem et al., 2021) http://doi.org/10.5067/VLJ5YXKCNGXO. Our shapefiles of lake and marine boundaries (lines), ice discharge into lakes (points), lake catchments (polygons) and overdeepenings/possible future lakes (polygons) are available via the Research Data Leeds Repository http://doi.org/10.5518/1107. |
URI: |
https://e-space.mmu.ac.uk/id/eprint/631192 |
DOI: |
https://doi.org/10.1029/2022GL099276 |
ISSN |
0094-8276 |
e-ISSN |
1944-8007 |
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