Ice-marginal proglacial lakes across Greenland: Present status and a possible future

Jonathan L. Carrivick, Penelope How, James M. Lea, Jenna L. Sutherland, Michael Grimes, Fiona S. Tweed, Stephen Cornford, Duncan J. Quincey, Joseph Mallalieu

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

1 Citationer (Scopus)

Abstrakt

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.

OriginalsprogEngelsk
Artikelnummere2022GL099276
Antal sider9
TidsskriftGeophysical Research Letters
Vol/bind49
Udgave nummer12
DOI
StatusUdgivet - 28 jun. 2022

Programområde

  • Programområde 5: Natur og klima

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