Centennial response of Greenland’s three largest outlet glaciers


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ingo.sasgen [ at ] awi.de

Abstract

The Greenland Ice Sheet is the largest land ice contributor to sea level rise. This will continue in the future but at an uncertain rate and observational estimates are limited to the last few decades. Understanding the long-term glacier response to external forcing is key to improving projections. Here we use historical photographs to calculate ice loss from 1880–2012 for Jakobshavn, Helheim, and Kangerlussuaq glacier. We estimate ice loss corresponding to a sea level rise of 8.1 ± 1.1 millimetres from these three glaciers. Projections of mass loss for these glaciers, using the worst-case scenario, Representative Concentration Pathways 8.5, suggest a sea level contribution of 9.1–14.9 mm by 2100. RCP8.5 implies an additional global temperature increase of 3.7 °C by 2100, approximately four times larger than that which has taken place since 1880. We infer that projections forced by RCP8.5 underestimate glacier mass loss which could exceed this worst-case scenario.



Item Type
Article
Authors
Divisions
Primary Division
Programs
Primary Topic
Helmholtz Cross Cutting Activity (2021-2027)
Research Networks
Peer revision
Peer-reviewed, Web of Science / Scopus
Publication Status
Published online
Eprint ID
56305
DOI 10.1038/s41467-020-19580-5

Cite as
Khan, S. A. , Bjørk, A. A. , Bamber, J. L. , Morlighem, M. , Bevis, M. , Kjær, K. H. , Mouginot, J. , Løkkegaard, A. , Holland, D. M. , Aschwanden, A. , Zhang, B. , Helm, V. , Korsgaard, N. J. , Colgan, W. , Larsen, N. K. , Liu, L. , Hansen, K. , Barletta, V. , Dahl-Jensen, T. S. , Søndergaard, A. S. , Csatho, B. M. , Sasgen, I. , Box, J. and Schenk, T. (2020): Centennial response of Greenland’s three largest outlet glaciers , Nature Communications, 11 (1), p. 5718 . doi: 10.1038/s41467-020-19580-5


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