A multimillion-year-old record of Greenland vegetation and glacial history preserved in sediment beneath 1.4 km of ice at Camp Century
Understanding the history of the Greenland Ice Sheet (GrIS) is critical for determining its sensitivity to warming and contribution to sea level; however, that history is poorly known before the last interglacial. Most knowledge comes from interpretation of marine sediment, an indirect record of pas...
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ftunivbruxelles:oai:dipot.ulb.ac.be:2013/330536 2023-10-09T21:49:20+02:00 A multimillion-year-old record of Greenland vegetation and glacial history preserved in sediment beneath 1.4 km of ice at Camp Century Christ, Andrew J. Bierman, Paul Robert Schaefer, Joerg M. Dahl-Jensen, Dorthe Steffensen, Jørgen Peder Corbett, Lee B. Peteet, Dorothy M. Thomas, Elizabeth K. Steig, Eric J. Rittenour, Tammy M. Tison, Jean-Louis Blard, Pierre-Henri Perdrial, Nicolas Dethier, David P. Lini, Andrea Hidy, Alan J. Caffee, Marc W. Southon, John 2021-03 1 full-text file(s): application/pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/330536 https://dipot.ulb.ac.be/dspace/bitstream/2013/330536/3/Christ.pdf en eng uri/info:doi/10.1073/pnas.2021442118 uri/info:pmid/33723012 uri/info:scp/85102911995 https://dipot.ulb.ac.be/dspace/bitstream/2013/330536/3/Christ.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/330536 1 full-text file(s): info:eu-repo/semantics/openAccess Proceedings of the National Academy of Sciences of the United States of America, 118 (13 Sciences exactes et naturelles Arctic Climate Ice core Ice sheet Pleistocene info:eu-repo/semantics/article info:ulb-repo/semantics/articlePeerReview info:ulb-repo/semantics/openurl/article 2021 ftunivbruxelles 2023-09-13T22:23:29Z Understanding the history of the Greenland Ice Sheet (GrIS) is critical for determining its sensitivity to warming and contribution to sea level; however, that history is poorly known before the last interglacial. Most knowledge comes from interpretation of marine sediment, an indirect record of past ice-sheet extent and behavior. Subglacial sediment and rock, retrieved at the base of ice cores, provide terrestrial evidence for GrIS behavior during the Pleistocene. Here, we use multiple methods to determine GrIS history from subglacial sediment at the base of the Camp Century ice core collected in 1966. This material contains a stratigraphic record of glaciation and vegetation in northwestern Greenland spanning the Pleistocene. Enriched stable isotopes of pore-ice suggest precipitation at lower elevations implying ice-sheet absence. Plant macrofossils and biomarkers in the sediment indicate that paleo-ecosystems from previous interglacial periods are preserved beneath the GrIS. Cosmogenic 26 Al/ 10 Be and luminescence data bracket the burial of the lower-most sediment between <3.2 ± 0.4 Ma and >0.7 to 1.4 Ma. In the upper-most sediment, cosmogenic 26 Al/ 10 Be data require exposure within the last 1.0 ± 0.1 My. The unique subglacial sedimentary record from Camp Century documents at least two episodes of ice-free, vegetated conditions, each followed by glaciation. The lower sediment derives from an Early Pleistocene GrIS advance. 26 Al/ 10 Be ratios in the upper-most sediment match those in subglacial bedrock from central Greenland, suggesting similar ice-cover histories across the GrIS. We conclude that the GrIS persisted through much of the Pleistocene but melted and reformed at least once since 1.1 Ma. SCOPUS: re.j info:eu-repo/semantics/published Article in Journal/Newspaper Arctic Greenland ice core Ice Sheet DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) Arctic Greenland |
institution |
Open Polar |
collection |
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
English |
topic |
Sciences exactes et naturelles Arctic Climate Ice core Ice sheet Pleistocene |
spellingShingle |
Sciences exactes et naturelles Arctic Climate Ice core Ice sheet Pleistocene Christ, Andrew J. Bierman, Paul Robert Schaefer, Joerg M. Dahl-Jensen, Dorthe Steffensen, Jørgen Peder Corbett, Lee B. Peteet, Dorothy M. Thomas, Elizabeth K. Steig, Eric J. Rittenour, Tammy M. Tison, Jean-Louis Blard, Pierre-Henri Perdrial, Nicolas Dethier, David P. Lini, Andrea Hidy, Alan J. Caffee, Marc W. Southon, John A multimillion-year-old record of Greenland vegetation and glacial history preserved in sediment beneath 1.4 km of ice at Camp Century |
topic_facet |
Sciences exactes et naturelles Arctic Climate Ice core Ice sheet Pleistocene |
description |
Understanding the history of the Greenland Ice Sheet (GrIS) is critical for determining its sensitivity to warming and contribution to sea level; however, that history is poorly known before the last interglacial. Most knowledge comes from interpretation of marine sediment, an indirect record of past ice-sheet extent and behavior. Subglacial sediment and rock, retrieved at the base of ice cores, provide terrestrial evidence for GrIS behavior during the Pleistocene. Here, we use multiple methods to determine GrIS history from subglacial sediment at the base of the Camp Century ice core collected in 1966. This material contains a stratigraphic record of glaciation and vegetation in northwestern Greenland spanning the Pleistocene. Enriched stable isotopes of pore-ice suggest precipitation at lower elevations implying ice-sheet absence. Plant macrofossils and biomarkers in the sediment indicate that paleo-ecosystems from previous interglacial periods are preserved beneath the GrIS. Cosmogenic 26 Al/ 10 Be and luminescence data bracket the burial of the lower-most sediment between <3.2 ± 0.4 Ma and >0.7 to 1.4 Ma. In the upper-most sediment, cosmogenic 26 Al/ 10 Be data require exposure within the last 1.0 ± 0.1 My. The unique subglacial sedimentary record from Camp Century documents at least two episodes of ice-free, vegetated conditions, each followed by glaciation. The lower sediment derives from an Early Pleistocene GrIS advance. 26 Al/ 10 Be ratios in the upper-most sediment match those in subglacial bedrock from central Greenland, suggesting similar ice-cover histories across the GrIS. We conclude that the GrIS persisted through much of the Pleistocene but melted and reformed at least once since 1.1 Ma. SCOPUS: re.j info:eu-repo/semantics/published |
format |
Article in Journal/Newspaper |
author |
Christ, Andrew J. Bierman, Paul Robert Schaefer, Joerg M. Dahl-Jensen, Dorthe Steffensen, Jørgen Peder Corbett, Lee B. Peteet, Dorothy M. Thomas, Elizabeth K. Steig, Eric J. Rittenour, Tammy M. Tison, Jean-Louis Blard, Pierre-Henri Perdrial, Nicolas Dethier, David P. Lini, Andrea Hidy, Alan J. Caffee, Marc W. Southon, John |
author_facet |
Christ, Andrew J. Bierman, Paul Robert Schaefer, Joerg M. Dahl-Jensen, Dorthe Steffensen, Jørgen Peder Corbett, Lee B. Peteet, Dorothy M. Thomas, Elizabeth K. Steig, Eric J. Rittenour, Tammy M. Tison, Jean-Louis Blard, Pierre-Henri Perdrial, Nicolas Dethier, David P. Lini, Andrea Hidy, Alan J. Caffee, Marc W. Southon, John |
author_sort |
Christ, Andrew J. |
title |
A multimillion-year-old record of Greenland vegetation and glacial history preserved in sediment beneath 1.4 km of ice at Camp Century |
title_short |
A multimillion-year-old record of Greenland vegetation and glacial history preserved in sediment beneath 1.4 km of ice at Camp Century |
title_full |
A multimillion-year-old record of Greenland vegetation and glacial history preserved in sediment beneath 1.4 km of ice at Camp Century |
title_fullStr |
A multimillion-year-old record of Greenland vegetation and glacial history preserved in sediment beneath 1.4 km of ice at Camp Century |
title_full_unstemmed |
A multimillion-year-old record of Greenland vegetation and glacial history preserved in sediment beneath 1.4 km of ice at Camp Century |
title_sort |
multimillion-year-old record of greenland vegetation and glacial history preserved in sediment beneath 1.4 km of ice at camp century |
publishDate |
2021 |
url |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/330536 https://dipot.ulb.ac.be/dspace/bitstream/2013/330536/3/Christ.pdf |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Greenland ice core Ice Sheet |
genre_facet |
Arctic Greenland ice core Ice Sheet |
op_source |
Proceedings of the National Academy of Sciences of the United States of America, 118 (13 |
op_relation |
uri/info:doi/10.1073/pnas.2021442118 uri/info:pmid/33723012 uri/info:scp/85102911995 https://dipot.ulb.ac.be/dspace/bitstream/2013/330536/3/Christ.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/330536 |
op_rights |
1 full-text file(s): info:eu-repo/semantics/openAccess |
_version_ |
1779312356526915584 |