Basal debris of the NEEM ice core, Greenland: a window into sub-ice-sheet geology, basal ice processes and ice-sheet oscillations
Abstract We present new data from the debris-rich basal ice layers of the NEEM ice core (NW Greenland). Using mineralogical observations, SEM imagery, geochemical data from silicates (meteoric 10 Be, εNd, 87 Sr/ 86 Sr) and organic material (C/N, δ 13 C), we characterize the source material, successi...
Published in: | Journal of Glaciology |
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Language: | English |
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Cambridge University Press (CUP)
2023
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Online Access: | http://dx.doi.org/10.1017/jog.2022.122 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143022001228 |
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crcambridgeupr:10.1017/jog.2022.122 2024-10-06T13:49:05+00:00 Basal debris of the NEEM ice core, Greenland: a window into sub-ice-sheet geology, basal ice processes and ice-sheet oscillations Blard, Pierre-Henri Protin, Marie Tison, Jean-Louis Fripiat, François Dahl-Jensen, Dorthe Steffensen, Jørgen P. Mahaney, William C. Bierman, Paul R. Christ, Andrew J. Corbett, Lee B. Debaille, Vinciane Rigaudier, Thomas Claeys, Philippe 2023 http://dx.doi.org/10.1017/jog.2022.122 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143022001228 en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by-nc-sa/4.0 Journal of Glaciology volume 69, issue 276, page 1011-1029 ISSN 0022-1430 1727-5652 journal-article 2023 crcambridgeupr https://doi.org/10.1017/jog.2022.122 2024-09-11T04:04:34Z Abstract We present new data from the debris-rich basal ice layers of the NEEM ice core (NW Greenland). Using mineralogical observations, SEM imagery, geochemical data from silicates (meteoric 10 Be, εNd, 87 Sr/ 86 Sr) and organic material (C/N, δ 13 C), we characterize the source material, succession of previous glaciations and deglaciations and the paleoecological conditions during ice-free episodes. Meteoric 10 Be data and grain features indicate that the ice sheet interacted with paleosols and eroded fresh bedrock, leading to mixing in these debris-rich ice layers. Our analysis also identifies four successive stages in NW Greenland: (1) initial preglacial conditions, (2) glacial advance 1, (3) glacial retreat and interglacial conditions and (4) glacial advance 2 (current ice-sheet development). C/N and δ 13 C data suggest that deglacial environments favored the development of tundra and taiga ecosystems. These two successive glacial fluctuations observed at NEEM are consistent with those identified from the Camp Century core basal sediments over the last 3 Ma. Further inland, GRIP and GISP2 summit sites have remained glaciated more continuously than the western margin, with less intense ice-substratum interactions than those observed at NEEM. Article in Journal/Newspaper Greenland GRIP ice core Ice Sheet Journal of Glaciology taiga Tundra Cambridge University Press Greenland Journal of Glaciology 69 276 1011 1029 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
Abstract We present new data from the debris-rich basal ice layers of the NEEM ice core (NW Greenland). Using mineralogical observations, SEM imagery, geochemical data from silicates (meteoric 10 Be, εNd, 87 Sr/ 86 Sr) and organic material (C/N, δ 13 C), we characterize the source material, succession of previous glaciations and deglaciations and the paleoecological conditions during ice-free episodes. Meteoric 10 Be data and grain features indicate that the ice sheet interacted with paleosols and eroded fresh bedrock, leading to mixing in these debris-rich ice layers. Our analysis also identifies four successive stages in NW Greenland: (1) initial preglacial conditions, (2) glacial advance 1, (3) glacial retreat and interglacial conditions and (4) glacial advance 2 (current ice-sheet development). C/N and δ 13 C data suggest that deglacial environments favored the development of tundra and taiga ecosystems. These two successive glacial fluctuations observed at NEEM are consistent with those identified from the Camp Century core basal sediments over the last 3 Ma. Further inland, GRIP and GISP2 summit sites have remained glaciated more continuously than the western margin, with less intense ice-substratum interactions than those observed at NEEM. |
format |
Article in Journal/Newspaper |
author |
Blard, Pierre-Henri Protin, Marie Tison, Jean-Louis Fripiat, François Dahl-Jensen, Dorthe Steffensen, Jørgen P. Mahaney, William C. Bierman, Paul R. Christ, Andrew J. Corbett, Lee B. Debaille, Vinciane Rigaudier, Thomas Claeys, Philippe |
spellingShingle |
Blard, Pierre-Henri Protin, Marie Tison, Jean-Louis Fripiat, François Dahl-Jensen, Dorthe Steffensen, Jørgen P. Mahaney, William C. Bierman, Paul R. Christ, Andrew J. Corbett, Lee B. Debaille, Vinciane Rigaudier, Thomas Claeys, Philippe Basal debris of the NEEM ice core, Greenland: a window into sub-ice-sheet geology, basal ice processes and ice-sheet oscillations |
author_facet |
Blard, Pierre-Henri Protin, Marie Tison, Jean-Louis Fripiat, François Dahl-Jensen, Dorthe Steffensen, Jørgen P. Mahaney, William C. Bierman, Paul R. Christ, Andrew J. Corbett, Lee B. Debaille, Vinciane Rigaudier, Thomas Claeys, Philippe |
author_sort |
Blard, Pierre-Henri |
title |
Basal debris of the NEEM ice core, Greenland: a window into sub-ice-sheet geology, basal ice processes and ice-sheet oscillations |
title_short |
Basal debris of the NEEM ice core, Greenland: a window into sub-ice-sheet geology, basal ice processes and ice-sheet oscillations |
title_full |
Basal debris of the NEEM ice core, Greenland: a window into sub-ice-sheet geology, basal ice processes and ice-sheet oscillations |
title_fullStr |
Basal debris of the NEEM ice core, Greenland: a window into sub-ice-sheet geology, basal ice processes and ice-sheet oscillations |
title_full_unstemmed |
Basal debris of the NEEM ice core, Greenland: a window into sub-ice-sheet geology, basal ice processes and ice-sheet oscillations |
title_sort |
basal debris of the neem ice core, greenland: a window into sub-ice-sheet geology, basal ice processes and ice-sheet oscillations |
publisher |
Cambridge University Press (CUP) |
publishDate |
2023 |
url |
http://dx.doi.org/10.1017/jog.2022.122 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143022001228 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland GRIP ice core Ice Sheet Journal of Glaciology taiga Tundra |
genre_facet |
Greenland GRIP ice core Ice Sheet Journal of Glaciology taiga Tundra |
op_source |
Journal of Glaciology volume 69, issue 276, page 1011-1029 ISSN 0022-1430 1727-5652 |
op_rights |
http://creativecommons.org/licenses/by-nc-sa/4.0 |
op_doi |
https://doi.org/10.1017/jog.2022.122 |
container_title |
Journal of Glaciology |
container_volume |
69 |
container_issue |
276 |
container_start_page |
1011 |
op_container_end_page |
1029 |
_version_ |
1812177162212474880 |