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Geodetic measurements reveal similarities between post–Last Glacial Maximum and present-day mass loss from the Greenland ice sheet

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dc.contributor.authorKhan, S. A.en
dc.contributor.authorSasgen, I.en
dc.contributor.authorBevis, M.en
dc.contributor.authorVan Dam, T.en
dc.contributor.authorBamber, J. L.en
dc.contributor.authorWillis, Michael J.en
dc.contributor.authorKjær, K. H.en
dc.contributor.authorWouters, B.en
dc.contributor.authorHelm, V.en
dc.contributor.authorCsatho, B.en
dc.contributor.authorFleming, K.en
dc.contributor.authorBjørk, A. A.en
dc.contributor.authorAschwanden, A.en
dc.contributor.authorKnudsen, P.en
dc.contributor.authorMunneke, P. K.en
dc.date.accessioned2024-02-21T19:21:20Zen
dc.date.available2024-02-21T19:21:20Zen
dc.date.issued2016-09-21en
dc.description.abstractAccurate 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.en
dc.description.versionPublished versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1126/sciadv.1600931en
dc.identifier.eissn2375-2548en
dc.identifier.issn2375-2548en
dc.identifier.issue9en
dc.identifier.otherPMC5031466en
dc.identifier.other1600931 (PII)en
dc.identifier.pmid27679819en
dc.identifier.urihttps://hdl.handle.net/10919/118093en
dc.identifier.volume2en
dc.language.isoenen
dc.publisherAmerican Association for the Advancement of Science (AAAS)en
dc.relation.urihttps://www.ncbi.nlm.nih.gov/pubmed/27679819en
dc.rightsCreative Commons Attribution-NonCommercial 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/en
dc.subjectGPSen
dc.subjectGreenland Ice Sheeten
dc.subjectLast Glacial Maximumen
dc.subjectSea level riseen
dc.subjectclimate changeen
dc.subjectglacial isostatic adjustmenten
dc.titleGeodetic measurements reveal similarities between post–Last Glacial Maximum and present-day mass loss from the Greenland ice sheeten
dc.title.serialScience Advancesen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.otherJournal Articleen
dcterms.dateAccepted2016-08-22en
pubs.organisational-group/Virginia Techen
pubs.organisational-group/Virginia Tech/Scienceen
pubs.organisational-group/Virginia Tech/Science/Geosciencesen
pubs.organisational-group/Virginia Tech/All T&R Facultyen
pubs.organisational-group/Virginia Tech/Science/COS T&R Facultyen

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