The Northwestern Greenland Ice Sheet During The Early Pleistocene Was Similar To Today
The multi-million year history of the Greenland Ice Sheet remains poorly known. Ice-proximal glacial marine diamict provides a direct but discontinuous record of ice sheet behavior; it is underutilized as a climate archive. Here, we present a novel multiproxy analysis of an Early Pleistocene marine...
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ftunivermont:oai:scholarworks.uvm.edu:casfac-1016 2023-07-02T03:32:21+02:00 The Northwestern Greenland Ice Sheet During The Early Pleistocene Was Similar To Today Christ, Andrew J. Bierman, Paul R. Knutz, Paul C. Corbett, Lee B. Fosdick, Julie C. Thomas, Elizabeth K. Cowling, Owen C. Hidy, Alan J. Caffee, Marc W. 2019-12-01T08:00:00Z application/pdf https://scholarworks.uvm.edu/casfac/15 https://doi.org/10.1029/2019GL085176 https://scholarworks.uvm.edu/context/casfac/article/1016/viewcontent/BiermanNorthwestern.pdf unknown UVM ScholarWorks https://scholarworks.uvm.edu/casfac/15 doi:10.1029/2019GL085176 https://scholarworks.uvm.edu/context/casfac/article/1016/viewcontent/BiermanNorthwestern.pdf ©2019. American Geophysical Union. All Rights Reserved. College of Arts and Sciences Faculty Publications climate proxies cosmogenic nuclides lipid biomarkers paleoclimate thermochronology Climate Solutions Climate text 2019 ftunivermont https://doi.org/10.1029/2019GL085176 2023-06-13T18:32:33Z The multi-million year history of the Greenland Ice Sheet remains poorly known. Ice-proximal glacial marine diamict provides a direct but discontinuous record of ice sheet behavior; it is underutilized as a climate archive. Here, we present a novel multiproxy analysis of an Early Pleistocene marine diamict from northwestern Greenland. Low cosmogenic nuclide concentrations indicate minimal near-surface exposure, similar to modern terrestrial sediment. Detrital apatite (U-Th-Sm)/He (AHe) ages all predate glaciation by >150 million years, suggesting the northwestern Greenland Ice Sheet had, by 1.9 Ma, not yet incised fjords of sufficient depth to excavate grains with young AHe ages. The diamict contains terrestrial plant leaf wax, likely from land surfaces surrounding the ice sheet. These data indicate that a persistent, dynamic ice sheet existed in northwestern Greenland by 1.9 Ma and that diamict is a useful archive of ice sheet history and process. Text Greenland Ice Sheet The University of Vermont: ScholarWorks @ UVM Greenland Geophysical Research Letters 47 1 |
institution |
Open Polar |
collection |
The University of Vermont: ScholarWorks @ UVM |
op_collection_id |
ftunivermont |
language |
unknown |
topic |
climate proxies cosmogenic nuclides lipid biomarkers paleoclimate thermochronology Climate Solutions Climate |
spellingShingle |
climate proxies cosmogenic nuclides lipid biomarkers paleoclimate thermochronology Climate Solutions Climate Christ, Andrew J. Bierman, Paul R. Knutz, Paul C. Corbett, Lee B. Fosdick, Julie C. Thomas, Elizabeth K. Cowling, Owen C. Hidy, Alan J. Caffee, Marc W. The Northwestern Greenland Ice Sheet During The Early Pleistocene Was Similar To Today |
topic_facet |
climate proxies cosmogenic nuclides lipid biomarkers paleoclimate thermochronology Climate Solutions Climate |
description |
The multi-million year history of the Greenland Ice Sheet remains poorly known. Ice-proximal glacial marine diamict provides a direct but discontinuous record of ice sheet behavior; it is underutilized as a climate archive. Here, we present a novel multiproxy analysis of an Early Pleistocene marine diamict from northwestern Greenland. Low cosmogenic nuclide concentrations indicate minimal near-surface exposure, similar to modern terrestrial sediment. Detrital apatite (U-Th-Sm)/He (AHe) ages all predate glaciation by >150 million years, suggesting the northwestern Greenland Ice Sheet had, by 1.9 Ma, not yet incised fjords of sufficient depth to excavate grains with young AHe ages. The diamict contains terrestrial plant leaf wax, likely from land surfaces surrounding the ice sheet. These data indicate that a persistent, dynamic ice sheet existed in northwestern Greenland by 1.9 Ma and that diamict is a useful archive of ice sheet history and process. |
format |
Text |
author |
Christ, Andrew J. Bierman, Paul R. Knutz, Paul C. Corbett, Lee B. Fosdick, Julie C. Thomas, Elizabeth K. Cowling, Owen C. Hidy, Alan J. Caffee, Marc W. |
author_facet |
Christ, Andrew J. Bierman, Paul R. Knutz, Paul C. Corbett, Lee B. Fosdick, Julie C. Thomas, Elizabeth K. Cowling, Owen C. Hidy, Alan J. Caffee, Marc W. |
author_sort |
Christ, Andrew J. |
title |
The Northwestern Greenland Ice Sheet During The Early Pleistocene Was Similar To Today |
title_short |
The Northwestern Greenland Ice Sheet During The Early Pleistocene Was Similar To Today |
title_full |
The Northwestern Greenland Ice Sheet During The Early Pleistocene Was Similar To Today |
title_fullStr |
The Northwestern Greenland Ice Sheet During The Early Pleistocene Was Similar To Today |
title_full_unstemmed |
The Northwestern Greenland Ice Sheet During The Early Pleistocene Was Similar To Today |
title_sort |
northwestern greenland ice sheet during the early pleistocene was similar to today |
publisher |
UVM ScholarWorks |
publishDate |
2019 |
url |
https://scholarworks.uvm.edu/casfac/15 https://doi.org/10.1029/2019GL085176 https://scholarworks.uvm.edu/context/casfac/article/1016/viewcontent/BiermanNorthwestern.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
College of Arts and Sciences Faculty Publications |
op_relation |
https://scholarworks.uvm.edu/casfac/15 doi:10.1029/2019GL085176 https://scholarworks.uvm.edu/context/casfac/article/1016/viewcontent/BiermanNorthwestern.pdf |
op_rights |
©2019. American Geophysical Union. All Rights Reserved. |
op_doi |
https://doi.org/10.1029/2019GL085176 |
container_title |
Geophysical Research Letters |
container_volume |
47 |
container_issue |
1 |
_version_ |
1770271900860153856 |