Geodetic measurements reveal similarities between post-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...
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Online Access: | https://epic.awi.de/id/eprint/42070/ https://epic.awi.de/id/eprint/42070/1/khan2016sa.pdf https://doi.org/10.1126/sciadv.1600931 https://hdl.handle.net/10013/epic.48881 https://hdl.handle.net/10013/epic.48881.d001 |
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ftawi:oai:epic.awi.de:42070 2024-09-15T18:08:38+00:00 Geodetic measurements reveal similarities between post-Last Glacial Maximum and present-day mass loss from the Greenland ice sheet Khan, S. A. Sasgen, I. Bevis, M. van Dam, T. Bamber, J. L. Wahr, J. Willis, M. Kjaer, K. H. Wouters, B. Helm, V. Csatho, B. Fleming, K. Bjork, A. A. Aschwanden, A. Knudsen, P. Munneke, P. K. 2016 application/pdf https://epic.awi.de/id/eprint/42070/ https://epic.awi.de/id/eprint/42070/1/khan2016sa.pdf https://doi.org/10.1126/sciadv.1600931 https://hdl.handle.net/10013/epic.48881 https://hdl.handle.net/10013/epic.48881.d001 unknown AAAS Washington https://epic.awi.de/id/eprint/42070/1/khan2016sa.pdf https://hdl.handle.net/10013/epic.48881.d001 Khan, S. A. , Sasgen, I. orcid:0000-0002-8993-0989 , Bevis, M. , van Dam, T. , Bamber, J. L. , Wahr, J. , Willis, M. , Kjaer, K. H. , Wouters, B. , Helm, V. orcid:0000-0001-7788-9328 , Csatho, B. , Fleming, K. , Bjork, A. A. , Aschwanden, A. , Knudsen, P. and Munneke, P. K. (2016) Geodetic measurements reveal similarities between post-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.48881 EPIC3Science Advances, AAAS Washington, 2(9), pp. e1600931, ISSN: 2375-2548 Article peerRev 2016 ftawi https://doi.org/10.1126/sciadv.1600931 2024-06-24T04:15:36Z 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 e1600931 |
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Open Polar |
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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, S. A. Sasgen, I. Bevis, M. van Dam, T. Bamber, J. L. Wahr, J. Willis, M. Kjaer, K. H. Wouters, B. Helm, V. Csatho, B. Fleming, K. Bjork, A. A. Aschwanden, A. Knudsen, P. Munneke, P. K. |
spellingShingle |
Khan, S. A. Sasgen, I. Bevis, M. van Dam, T. Bamber, J. L. Wahr, J. Willis, M. Kjaer, K. H. Wouters, B. Helm, V. Csatho, B. Fleming, K. Bjork, A. A. Aschwanden, A. Knudsen, P. Munneke, P. K. Geodetic measurements reveal similarities between post-Last Glacial Maximum and present-day mass loss from the Greenland ice sheet |
author_facet |
Khan, S. A. Sasgen, I. Bevis, M. van Dam, T. Bamber, J. L. Wahr, J. Willis, M. Kjaer, K. H. Wouters, B. Helm, V. Csatho, B. Fleming, K. Bjork, A. A. Aschwanden, A. Knudsen, P. Munneke, P. K. |
author_sort |
Khan, S. A. |
title |
Geodetic measurements reveal similarities between post-Last Glacial Maximum and present-day mass loss from the Greenland ice sheet |
title_short |
Geodetic measurements reveal similarities between post-Last Glacial Maximum and present-day mass loss from the Greenland ice sheet |
title_full |
Geodetic measurements reveal similarities between post-Last Glacial Maximum and present-day mass loss from the Greenland ice sheet |
title_fullStr |
Geodetic measurements reveal similarities between post-Last Glacial Maximum and present-day mass loss from the Greenland ice sheet |
title_full_unstemmed |
Geodetic measurements reveal similarities between post-Last Glacial Maximum and present-day mass loss from the Greenland ice sheet |
title_sort |
geodetic measurements reveal similarities between post-last glacial maximum and present-day mass loss from the greenland ice sheet |
publisher |
AAAS Washington |
publishDate |
2016 |
url |
https://epic.awi.de/id/eprint/42070/ https://epic.awi.de/id/eprint/42070/1/khan2016sa.pdf https://doi.org/10.1126/sciadv.1600931 https://hdl.handle.net/10013/epic.48881 https://hdl.handle.net/10013/epic.48881.d001 |
genre |
Greenland Ice Sheet Iceland |
genre_facet |
Greenland Ice Sheet Iceland |
op_source |
EPIC3Science Advances, AAAS Washington, 2(9), pp. e1600931, ISSN: 2375-2548 |
op_relation |
https://epic.awi.de/id/eprint/42070/1/khan2016sa.pdf https://hdl.handle.net/10013/epic.48881.d001 Khan, S. A. , Sasgen, I. orcid:0000-0002-8993-0989 , Bevis, M. , van Dam, T. , Bamber, J. L. , Wahr, J. , Willis, M. , Kjaer, K. H. , Wouters, B. , Helm, V. orcid:0000-0001-7788-9328 , Csatho, B. , Fleming, K. , Bjork, A. A. , Aschwanden, A. , Knudsen, P. and Munneke, P. K. (2016) Geodetic measurements reveal similarities between post-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.48881 |
op_doi |
https://doi.org/10.1126/sciadv.1600931 |
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Science Advances |
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2 |
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9 |
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