Geodetic measurements reveal similarities between Last Glacial Maximum and present-day mass loss from the Greenland ice sheet
Accurate quantification of the millennial-scale mass balance of the Greenland ice sheet (GrIS) and its contribution to global sea-level rise remain challenging because of sparse in situ observations in key regions. Glacial isostatic adjustment (GIA) is the ongoing response of the solid Earth to ice...
Published in: | Science Advances |
---|---|
Main Authors: | , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
American Association for the Advancement of Science
2016
|
Subjects: | |
Online Access: | https://epic.awi.de/id/eprint/56309/ https://epic.awi.de/id/eprint/56309/1/sciadv1600931.pdf https://www.science.org/doi/10.1126/sciadv.1600931 https://hdl.handle.net/10013/epic.4b1e5971-a9df-4f04-b161-73933d0aff21 |
id |
ftawi:oai:epic.awi.de:56309 |
---|---|
record_format |
openpolar |
spelling |
ftawi:oai:epic.awi.de:56309 2024-09-15T18:08:38+00:00 Geodetic measurements reveal similarities between Last Glacial Maximum and present-day mass loss from the Greenland ice sheet Khan, Shfaqat A Sasgen, Ingo Bevis, Michael van Dam, Tonie Bamber, Jonathan L Wahr, John Willis, Michael Kjær, Kurt H Wouters, Bert Helm, Veit Csatho, Beata Fleming, Kevin Björk, G. Aschwanden, Andy Knudsen, Per Kuipers Munneke, Peters 2016 application/pdf https://epic.awi.de/id/eprint/56309/ https://epic.awi.de/id/eprint/56309/1/sciadv1600931.pdf https://www.science.org/doi/10.1126/sciadv.1600931 https://hdl.handle.net/10013/epic.4b1e5971-a9df-4f04-b161-73933d0aff21 unknown American Association for the Advancement of Science https://epic.awi.de/id/eprint/56309/1/sciadv1600931.pdf Khan, S. A. , Sasgen, I. orcid:0000-0002-8993-0989 , Bevis, M. , van Dam, T. , Bamber, J. L. , Wahr, J. , Willis, M. , Kjær, K. H. , Wouters, B. , Helm, V. , Csatho, B. , Fleming, K. , Björk, G. , Aschwanden, A. , Knudsen, P. and Kuipers Munneke, P. (2016) Geodetic measurements reveal similarities between Last Glacial Maximum and present-day mass loss from the Greenland ice sheet , Science Advances, 2 (9), e1600931 . doi:10.1126/sciadv.1600931 <https://doi.org/10.1126/sciadv.1600931> , hdl:10013/epic.4b1e5971-a9df-4f04-b161-73933d0aff21 EPIC3Science Advances, American Association for the Advancement of Science, 2(9), pp. e1600931 Article isiRev 2016 ftawi https://doi.org/10.1126/sciadv.1600931 2024-06-24T04:28:46Z Accurate quantification of the millennial-scale mass balance of the Greenland ice sheet (GrIS) and its contribution to global sea-level rise remain challenging because of sparse in situ observations in key regions. Glacial isostatic adjustment (GIA) is the ongoing response of the solid Earth to ice and ocean load changes occurring since the Last Glacial Maximum (LGM; ~21 thousand years ago) and may be used to constrain the GrIS deglaciation history. We use data from the Greenland Global Positioning System network to directly measure GIA and estimate basin-wide mass changes since the LGM. Unpredicted, large GIA uplift rates of +12 mm/year are found in southeast Greenland. These rates are due to low upper mantle viscosity in the region, from when Greenland passed over the Iceland hot spot about 40 million years ago. This region of concentrated soft rheology has a profound influence on reconstructing the deglaciation history of Greenland. We reevaluate the evolution of the GrIS since LGM and obtain a loss of 1.5-m sea-level equivalent from the northwest and southeast. These same sectors are dominating modern mass loss. We suggest that the present destabilization of these marine-based sectors may increase sea level for centuries to come. Our new deglaciation history and GIA uplift estimates suggest that studies that use the Gravity Recovery and Climate Experiment satellite mission to infer present-day changes in the GrIS may have erroneously corrected for GIA and underestimated the mass loss by about 20 gigatons/year. Article in Journal/Newspaper Greenland Ice Sheet Iceland Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Science Advances 2 9 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Accurate quantification of the millennial-scale mass balance of the Greenland ice sheet (GrIS) and its contribution to global sea-level rise remain challenging because of sparse in situ observations in key regions. Glacial isostatic adjustment (GIA) is the ongoing response of the solid Earth to ice and ocean load changes occurring since the Last Glacial Maximum (LGM; ~21 thousand years ago) and may be used to constrain the GrIS deglaciation history. We use data from the Greenland Global Positioning System network to directly measure GIA and estimate basin-wide mass changes since the LGM. Unpredicted, large GIA uplift rates of +12 mm/year are found in southeast Greenland. These rates are due to low upper mantle viscosity in the region, from when Greenland passed over the Iceland hot spot about 40 million years ago. This region of concentrated soft rheology has a profound influence on reconstructing the deglaciation history of Greenland. We reevaluate the evolution of the GrIS since LGM and obtain a loss of 1.5-m sea-level equivalent from the northwest and southeast. These same sectors are dominating modern mass loss. We suggest that the present destabilization of these marine-based sectors may increase sea level for centuries to come. Our new deglaciation history and GIA uplift estimates suggest that studies that use the Gravity Recovery and Climate Experiment satellite mission to infer present-day changes in the GrIS may have erroneously corrected for GIA and underestimated the mass loss by about 20 gigatons/year. |
format |
Article in Journal/Newspaper |
author |
Khan, Shfaqat A Sasgen, Ingo Bevis, Michael van Dam, Tonie Bamber, Jonathan L Wahr, John Willis, Michael Kjær, Kurt H Wouters, Bert Helm, Veit Csatho, Beata Fleming, Kevin Björk, G. Aschwanden, Andy Knudsen, Per Kuipers Munneke, Peters |
spellingShingle |
Khan, Shfaqat A Sasgen, Ingo Bevis, Michael van Dam, Tonie Bamber, Jonathan L Wahr, John Willis, Michael Kjær, Kurt H Wouters, Bert Helm, Veit Csatho, Beata Fleming, Kevin Björk, G. Aschwanden, Andy Knudsen, Per Kuipers Munneke, Peters Geodetic measurements reveal similarities between Last Glacial Maximum and present-day mass loss from the Greenland ice sheet |
author_facet |
Khan, Shfaqat A Sasgen, Ingo Bevis, Michael van Dam, Tonie Bamber, Jonathan L Wahr, John Willis, Michael Kjær, Kurt H Wouters, Bert Helm, Veit Csatho, Beata Fleming, Kevin Björk, G. Aschwanden, Andy Knudsen, Per Kuipers Munneke, Peters |
author_sort |
Khan, Shfaqat A |
title |
Geodetic measurements reveal similarities between Last Glacial Maximum and present-day mass loss from the Greenland ice sheet |
title_short |
Geodetic measurements reveal similarities between Last Glacial Maximum and present-day mass loss from the Greenland ice sheet |
title_full |
Geodetic measurements reveal similarities between Last Glacial Maximum and present-day mass loss from the Greenland ice sheet |
title_fullStr |
Geodetic measurements reveal similarities between Last Glacial Maximum and present-day mass loss from the Greenland ice sheet |
title_full_unstemmed |
Geodetic measurements reveal similarities between Last Glacial Maximum and present-day mass loss from the Greenland ice sheet |
title_sort |
geodetic measurements reveal similarities between last glacial maximum and present-day mass loss from the greenland ice sheet |
publisher |
American Association for the Advancement of Science |
publishDate |
2016 |
url |
https://epic.awi.de/id/eprint/56309/ https://epic.awi.de/id/eprint/56309/1/sciadv1600931.pdf https://www.science.org/doi/10.1126/sciadv.1600931 https://hdl.handle.net/10013/epic.4b1e5971-a9df-4f04-b161-73933d0aff21 |
genre |
Greenland Ice Sheet Iceland |
genre_facet |
Greenland Ice Sheet Iceland |
op_source |
EPIC3Science Advances, American Association for the Advancement of Science, 2(9), pp. e1600931 |
op_relation |
https://epic.awi.de/id/eprint/56309/1/sciadv1600931.pdf Khan, S. A. , Sasgen, I. orcid:0000-0002-8993-0989 , Bevis, M. , van Dam, T. , Bamber, J. L. , Wahr, J. , Willis, M. , Kjær, K. H. , Wouters, B. , Helm, V. , Csatho, B. , Fleming, K. , Björk, G. , Aschwanden, A. , Knudsen, P. and Kuipers Munneke, P. (2016) Geodetic measurements reveal similarities between Last Glacial Maximum and present-day mass loss from the Greenland ice sheet , Science Advances, 2 (9), e1600931 . doi:10.1126/sciadv.1600931 <https://doi.org/10.1126/sciadv.1600931> , hdl:10013/epic.4b1e5971-a9df-4f04-b161-73933d0aff21 |
op_doi |
https://doi.org/10.1126/sciadv.1600931 |
container_title |
Science Advances |
container_volume |
2 |
container_issue |
9 |
_version_ |
1810446010199048192 |