Subglacial precipitates record Antarctic ice sheet response to late Pleistocene millennial climate cycles
Ice cores and offshore sedimentary records demonstrate enhanced ice loss along Antarctic coastal margins during millennial-scale warm intervals within the last glacial termination. However, the distal location and short temporal coverage of these records leads to uncertainty in both the spatial foot...
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ftcdlib:oai:escholarship.org:ark:/13030/qt9268270t 2023-11-12T04:08:27+01:00 Subglacial precipitates record Antarctic ice sheet response to late Pleistocene millennial climate cycles Piccione, Gavin Blackburn, Terrence Tulaczyk, Slawek Rasbury, E Troy Hain, Mathis P Ibarra, Daniel E Methner, Katharina Tinglof, Chloe Cheney, Brandon Northrup, Paul Licht, Kathy 5428 2022-01-01 application/pdf https://escholarship.org/uc/item/9268270t unknown eScholarship, University of California qt9268270t https://escholarship.org/uc/item/9268270t public Nature Communications, vol 13, iss 1 Earth Sciences Physical Geography and Environmental Geoscience Geology Climate Action article 2022 ftcdlib 2023-10-16T18:05:29Z Ice cores and offshore sedimentary records demonstrate enhanced ice loss along Antarctic coastal margins during millennial-scale warm intervals within the last glacial termination. However, the distal location and short temporal coverage of these records leads to uncertainty in both the spatial footprint of ice loss, and whether millennial-scale ice response occurs outside of glacial terminations. Here we present a >100kyr archive of periodic transitions in subglacial precipitate mineralogy that are synchronous with Late Pleistocene millennial-scale climate cycles. Geochemical and geochronologic data provide evidence for opal formation during cold periods via cryoconcentration of subglacial brine, and calcite formation during warm periods through the addition of subglacial meltwater originating from the ice sheet interior. These freeze-flush cycles represent cyclic changes in subglacial hydrologic-connectivity driven by ice sheet velocity fluctuations. Our findings imply that oscillating Southern Ocean temperatures drive a dynamic response in the Antarctic ice sheet on millennial timescales, regardless of the background climate state. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Southern Ocean University of California: eScholarship Antarctic Southern Ocean The Antarctic |
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Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Earth Sciences Physical Geography and Environmental Geoscience Geology Climate Action |
spellingShingle |
Earth Sciences Physical Geography and Environmental Geoscience Geology Climate Action Piccione, Gavin Blackburn, Terrence Tulaczyk, Slawek Rasbury, E Troy Hain, Mathis P Ibarra, Daniel E Methner, Katharina Tinglof, Chloe Cheney, Brandon Northrup, Paul Licht, Kathy Subglacial precipitates record Antarctic ice sheet response to late Pleistocene millennial climate cycles |
topic_facet |
Earth Sciences Physical Geography and Environmental Geoscience Geology Climate Action |
description |
Ice cores and offshore sedimentary records demonstrate enhanced ice loss along Antarctic coastal margins during millennial-scale warm intervals within the last glacial termination. However, the distal location and short temporal coverage of these records leads to uncertainty in both the spatial footprint of ice loss, and whether millennial-scale ice response occurs outside of glacial terminations. Here we present a >100kyr archive of periodic transitions in subglacial precipitate mineralogy that are synchronous with Late Pleistocene millennial-scale climate cycles. Geochemical and geochronologic data provide evidence for opal formation during cold periods via cryoconcentration of subglacial brine, and calcite formation during warm periods through the addition of subglacial meltwater originating from the ice sheet interior. These freeze-flush cycles represent cyclic changes in subglacial hydrologic-connectivity driven by ice sheet velocity fluctuations. Our findings imply that oscillating Southern Ocean temperatures drive a dynamic response in the Antarctic ice sheet on millennial timescales, regardless of the background climate state. |
format |
Article in Journal/Newspaper |
author |
Piccione, Gavin Blackburn, Terrence Tulaczyk, Slawek Rasbury, E Troy Hain, Mathis P Ibarra, Daniel E Methner, Katharina Tinglof, Chloe Cheney, Brandon Northrup, Paul Licht, Kathy |
author_facet |
Piccione, Gavin Blackburn, Terrence Tulaczyk, Slawek Rasbury, E Troy Hain, Mathis P Ibarra, Daniel E Methner, Katharina Tinglof, Chloe Cheney, Brandon Northrup, Paul Licht, Kathy |
author_sort |
Piccione, Gavin |
title |
Subglacial precipitates record Antarctic ice sheet response to late Pleistocene millennial climate cycles |
title_short |
Subglacial precipitates record Antarctic ice sheet response to late Pleistocene millennial climate cycles |
title_full |
Subglacial precipitates record Antarctic ice sheet response to late Pleistocene millennial climate cycles |
title_fullStr |
Subglacial precipitates record Antarctic ice sheet response to late Pleistocene millennial climate cycles |
title_full_unstemmed |
Subglacial precipitates record Antarctic ice sheet response to late Pleistocene millennial climate cycles |
title_sort |
subglacial precipitates record antarctic ice sheet response to late pleistocene millennial climate cycles |
publisher |
eScholarship, University of California |
publishDate |
2022 |
url |
https://escholarship.org/uc/item/9268270t |
op_coverage |
5428 |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Ice Sheet Southern Ocean |
genre_facet |
Antarc* Antarctic Ice Sheet Southern Ocean |
op_source |
Nature Communications, vol 13, iss 1 |
op_relation |
qt9268270t https://escholarship.org/uc/item/9268270t |
op_rights |
public |
_version_ |
1782328745326018560 |