Terrestrial evidence for ocean forcing of Heinrich events and subglacial hydrologic connectivity of the Laurentide Ice Sheet
During the last glacial period, the Laurentide Ice Sheet (LIS) underwent episodes of rapid iceberg discharge, recorded in ocean sediments as “Heinrich events” (HEs). Two competing models attempt to describe the stimulus for HEs via either internal ice sheet oscillations or external ocean-climate sys...
Published in: | Science Advances |
---|---|
Main Authors: | , , , , , |
Format: | Text |
Language: | English |
Published: |
American Association for the Advancement of Science
2022
|
Subjects: | |
Online Access: | http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9581489/ http://www.ncbi.nlm.nih.gov/pubmed/36260662 https://doi.org/10.1126/sciadv.abp9329 |
id |
ftpubmed:oai:pubmedcentral.nih.gov:9581489 |
---|---|
record_format |
openpolar |
spelling |
ftpubmed:oai:pubmedcentral.nih.gov:9581489 2023-05-15T15:35:23+02:00 Terrestrial evidence for ocean forcing of Heinrich events and subglacial hydrologic connectivity of the Laurentide Ice Sheet Edwards, Graham H. Blackburn, Terrence Piccione, Gavin Tulaczyk, Slawek Miller, Gifford H. Sikes, Cosmo 2022-10-19 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9581489/ http://www.ncbi.nlm.nih.gov/pubmed/36260662 https://doi.org/10.1126/sciadv.abp9329 en eng American Association for the Advancement of Science http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9581489/ http://www.ncbi.nlm.nih.gov/pubmed/36260662 http://dx.doi.org/10.1126/sciadv.abp9329 Copyright © 2022 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY). https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution license (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. CC-BY Sci Adv Earth Environmental Ecological and Space Sciences Text 2022 ftpubmed https://doi.org/10.1126/sciadv.abp9329 2022-10-30T00:35:21Z During the last glacial period, the Laurentide Ice Sheet (LIS) underwent episodes of rapid iceberg discharge, recorded in ocean sediments as “Heinrich events” (HEs). Two competing models attempt to describe the stimulus for HEs via either internal ice sheet oscillations or external ocean-climate system forcing. We present a terrestrial record of HEs from the northeastern LIS that strongly supports ocean-climate forcing. Subglacial carbonate precipitates from Baffin Island record episodes of subglacial melting coincident with the three most recent HEs, resulting from acceleration of nearby marine-terminating ice streams. Synchronized ice stream acceleration over Baffin Island and Hudson Strait is inconsistent with internal ice sheet oscillations alone and indicates a shared ocean-climate stimulus to coordinate these different glaciological systems. Isotopic compositions of these precipitates record widespread subglacial groundwater connectivity beneath the LIS. Extensive basal melting and flushing of these aquifers during the last HE may have been a harbinger for terminal deglaciation. Text Baffin Island Baffin Hudson Strait Ice Sheet PubMed Central (PMC) Baffin Island Hudson Hudson Strait ENVELOPE(-70.000,-70.000,62.000,62.000) Science Advances 8 42 |
institution |
Open Polar |
collection |
PubMed Central (PMC) |
op_collection_id |
ftpubmed |
language |
English |
topic |
Earth Environmental Ecological and Space Sciences |
spellingShingle |
Earth Environmental Ecological and Space Sciences Edwards, Graham H. Blackburn, Terrence Piccione, Gavin Tulaczyk, Slawek Miller, Gifford H. Sikes, Cosmo Terrestrial evidence for ocean forcing of Heinrich events and subglacial hydrologic connectivity of the Laurentide Ice Sheet |
topic_facet |
Earth Environmental Ecological and Space Sciences |
description |
During the last glacial period, the Laurentide Ice Sheet (LIS) underwent episodes of rapid iceberg discharge, recorded in ocean sediments as “Heinrich events” (HEs). Two competing models attempt to describe the stimulus for HEs via either internal ice sheet oscillations or external ocean-climate system forcing. We present a terrestrial record of HEs from the northeastern LIS that strongly supports ocean-climate forcing. Subglacial carbonate precipitates from Baffin Island record episodes of subglacial melting coincident with the three most recent HEs, resulting from acceleration of nearby marine-terminating ice streams. Synchronized ice stream acceleration over Baffin Island and Hudson Strait is inconsistent with internal ice sheet oscillations alone and indicates a shared ocean-climate stimulus to coordinate these different glaciological systems. Isotopic compositions of these precipitates record widespread subglacial groundwater connectivity beneath the LIS. Extensive basal melting and flushing of these aquifers during the last HE may have been a harbinger for terminal deglaciation. |
format |
Text |
author |
Edwards, Graham H. Blackburn, Terrence Piccione, Gavin Tulaczyk, Slawek Miller, Gifford H. Sikes, Cosmo |
author_facet |
Edwards, Graham H. Blackburn, Terrence Piccione, Gavin Tulaczyk, Slawek Miller, Gifford H. Sikes, Cosmo |
author_sort |
Edwards, Graham H. |
title |
Terrestrial evidence for ocean forcing of Heinrich events and subglacial hydrologic connectivity of the Laurentide Ice Sheet |
title_short |
Terrestrial evidence for ocean forcing of Heinrich events and subglacial hydrologic connectivity of the Laurentide Ice Sheet |
title_full |
Terrestrial evidence for ocean forcing of Heinrich events and subglacial hydrologic connectivity of the Laurentide Ice Sheet |
title_fullStr |
Terrestrial evidence for ocean forcing of Heinrich events and subglacial hydrologic connectivity of the Laurentide Ice Sheet |
title_full_unstemmed |
Terrestrial evidence for ocean forcing of Heinrich events and subglacial hydrologic connectivity of the Laurentide Ice Sheet |
title_sort |
terrestrial evidence for ocean forcing of heinrich events and subglacial hydrologic connectivity of the laurentide ice sheet |
publisher |
American Association for the Advancement of Science |
publishDate |
2022 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9581489/ http://www.ncbi.nlm.nih.gov/pubmed/36260662 https://doi.org/10.1126/sciadv.abp9329 |
long_lat |
ENVELOPE(-70.000,-70.000,62.000,62.000) |
geographic |
Baffin Island Hudson Hudson Strait |
geographic_facet |
Baffin Island Hudson Hudson Strait |
genre |
Baffin Island Baffin Hudson Strait Ice Sheet |
genre_facet |
Baffin Island Baffin Hudson Strait Ice Sheet |
op_source |
Sci Adv |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9581489/ http://www.ncbi.nlm.nih.gov/pubmed/36260662 http://dx.doi.org/10.1126/sciadv.abp9329 |
op_rights |
Copyright © 2022 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY). https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution license (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1126/sciadv.abp9329 |
container_title |
Science Advances |
container_volume |
8 |
container_issue |
42 |
_version_ |
1766365723354988544 |