Climate variability and ice-sheet dynamics during the last three glaciations
A composite North Atlantic record from DSDP Site 609 and IODP Site U1308 spans the past 300,000 years and shows that variability within the penultimate glaciation differed substantially from that of the surrounding two glaciations. Hematite-stained grains exhibit similar repetitive down-core variati...
Published in: | Earth and Planetary Science Letters |
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Format: | Article in Journal/Newspaper |
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Online Access: | http://eprints.esc.cam.ac.uk/3233/ http://eprints.esc.cam.ac.uk/3233/1/Obrochta%20et%20al.%20-%202014%20-%20Climate%20variability%20and%20ice-sheet%20dynamics%20during.pdf http://eprints.esc.cam.ac.uk/3233/2/1-s2.0-S0012821X14005494-gr001.jpg http://eprints.esc.cam.ac.uk/3233/3/mmc1.pdf http://eprints.esc.cam.ac.uk/3233/4/mmc2.kml http://www.sciencedirect.com/science/article/pii/S0012821X14005494 https://doi.org/10.1016/j.epsl.2014.09.004 |
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ftucambridgeesc:oai:eprints.esc.cam.ac.uk:3233 2023-05-15T13:55:44+02:00 Climate variability and ice-sheet dynamics during the last three glaciations Obrochta, Stephen P. Crowley, Thomas J. Channell, James E. T. Hodell, David A. Baker, Paul A. Seki, Arisa Yokoyama, Yusuke 2014-11 text image http://eprints.esc.cam.ac.uk/3233/ http://eprints.esc.cam.ac.uk/3233/1/Obrochta%20et%20al.%20-%202014%20-%20Climate%20variability%20and%20ice-sheet%20dynamics%20during.pdf http://eprints.esc.cam.ac.uk/3233/2/1-s2.0-S0012821X14005494-gr001.jpg http://eprints.esc.cam.ac.uk/3233/3/mmc1.pdf http://eprints.esc.cam.ac.uk/3233/4/mmc2.kml http://www.sciencedirect.com/science/article/pii/S0012821X14005494 https://doi.org/10.1016/j.epsl.2014.09.004 en eng http://eprints.esc.cam.ac.uk/3233/1/Obrochta%20et%20al.%20-%202014%20-%20Climate%20variability%20and%20ice-sheet%20dynamics%20during.pdf http://eprints.esc.cam.ac.uk/3233/2/1-s2.0-S0012821X14005494-gr001.jpg http://eprints.esc.cam.ac.uk/3233/3/mmc1.pdf http://eprints.esc.cam.ac.uk/3233/4/mmc2.kml Obrochta, Stephen P. and Crowley, Thomas J. and Channell, James E. T. and Hodell, David A. and Baker, Paul A. and Seki, Arisa and Yokoyama, Yusuke (2014) Climate variability and ice-sheet dynamics during the last three glaciations. Earth and Planetary Science Letters, 406. pp. 198-212. ISSN 0012821X DOI https://doi.org/10.1016/j.epsl.2014.09.004 <https://doi.org/10.1016/j.epsl.2014.09.004> cc_by cc_by_nd CC-BY CC-BY-ND 01 - Climate Change and Earth-Ocean Atmosphere Systems Article PeerReviewed 2014 ftucambridgeesc https://doi.org/10.1016/j.epsl.2014.09.004 2020-08-27T18:09:36Z A composite North Atlantic record from DSDP Site 609 and IODP Site U1308 spans the past 300,000 years and shows that variability within the penultimate glaciation differed substantially from that of the surrounding two glaciations. Hematite-stained grains exhibit similar repetitive down-core variations within the Marine Isotope Stage (MIS) 8 and 4–2 intervals, but little cyclic variability within the MIS 6 section. There is also no petrologic evidence, in terms of detrital carbonate-rich (Heinrich) layers, for surging of the Laurentide Ice Sheet through the Hudson Strait during MIS 6. Rather, very high background concentration of iceberg-rafted debris (IRD) indicates near continuous glacial meltwater input that likely increased thermohaline disruption sensitivity to relatively weak forcing events, such as expanded sea ice over deepwater formation sites. Altered (sub)tropical precipitation patterns and Antarctic warming during high orbital precession and low 65°N summer insolation appear related to high abundance of Icelandic glass shards and southward sea ice expansion. Differing European and North American ice sheet configurations, perhaps aided by larger variations in eccentricity leading to cooler summers, may have contributed to the relative stability of the Laurentide Ice Sheet in the Hudson Strait region during MIS 6. Article in Journal/Newspaper Antarc* Antarctic Hudson Strait Ice Sheet Iceberg* North Atlantic Sea ice University of Cambridge, Department of Earth Sciences: ESC Publications Antarctic Hudson Hudson Strait ENVELOPE(-70.000,-70.000,62.000,62.000) Earth and Planetary Science Letters 406 198 212 |
institution |
Open Polar |
collection |
University of Cambridge, Department of Earth Sciences: ESC Publications |
op_collection_id |
ftucambridgeesc |
language |
English |
topic |
01 - Climate Change and Earth-Ocean Atmosphere Systems |
spellingShingle |
01 - Climate Change and Earth-Ocean Atmosphere Systems Obrochta, Stephen P. Crowley, Thomas J. Channell, James E. T. Hodell, David A. Baker, Paul A. Seki, Arisa Yokoyama, Yusuke Climate variability and ice-sheet dynamics during the last three glaciations |
topic_facet |
01 - Climate Change and Earth-Ocean Atmosphere Systems |
description |
A composite North Atlantic record from DSDP Site 609 and IODP Site U1308 spans the past 300,000 years and shows that variability within the penultimate glaciation differed substantially from that of the surrounding two glaciations. Hematite-stained grains exhibit similar repetitive down-core variations within the Marine Isotope Stage (MIS) 8 and 4–2 intervals, but little cyclic variability within the MIS 6 section. There is also no petrologic evidence, in terms of detrital carbonate-rich (Heinrich) layers, for surging of the Laurentide Ice Sheet through the Hudson Strait during MIS 6. Rather, very high background concentration of iceberg-rafted debris (IRD) indicates near continuous glacial meltwater input that likely increased thermohaline disruption sensitivity to relatively weak forcing events, such as expanded sea ice over deepwater formation sites. Altered (sub)tropical precipitation patterns and Antarctic warming during high orbital precession and low 65°N summer insolation appear related to high abundance of Icelandic glass shards and southward sea ice expansion. Differing European and North American ice sheet configurations, perhaps aided by larger variations in eccentricity leading to cooler summers, may have contributed to the relative stability of the Laurentide Ice Sheet in the Hudson Strait region during MIS 6. |
format |
Article in Journal/Newspaper |
author |
Obrochta, Stephen P. Crowley, Thomas J. Channell, James E. T. Hodell, David A. Baker, Paul A. Seki, Arisa Yokoyama, Yusuke |
author_facet |
Obrochta, Stephen P. Crowley, Thomas J. Channell, James E. T. Hodell, David A. Baker, Paul A. Seki, Arisa Yokoyama, Yusuke |
author_sort |
Obrochta, Stephen P. |
title |
Climate variability and ice-sheet dynamics during the last three glaciations |
title_short |
Climate variability and ice-sheet dynamics during the last three glaciations |
title_full |
Climate variability and ice-sheet dynamics during the last three glaciations |
title_fullStr |
Climate variability and ice-sheet dynamics during the last three glaciations |
title_full_unstemmed |
Climate variability and ice-sheet dynamics during the last three glaciations |
title_sort |
climate variability and ice-sheet dynamics during the last three glaciations |
publishDate |
2014 |
url |
http://eprints.esc.cam.ac.uk/3233/ http://eprints.esc.cam.ac.uk/3233/1/Obrochta%20et%20al.%20-%202014%20-%20Climate%20variability%20and%20ice-sheet%20dynamics%20during.pdf http://eprints.esc.cam.ac.uk/3233/2/1-s2.0-S0012821X14005494-gr001.jpg http://eprints.esc.cam.ac.uk/3233/3/mmc1.pdf http://eprints.esc.cam.ac.uk/3233/4/mmc2.kml http://www.sciencedirect.com/science/article/pii/S0012821X14005494 https://doi.org/10.1016/j.epsl.2014.09.004 |
long_lat |
ENVELOPE(-70.000,-70.000,62.000,62.000) |
geographic |
Antarctic Hudson Hudson Strait |
geographic_facet |
Antarctic Hudson Hudson Strait |
genre |
Antarc* Antarctic Hudson Strait Ice Sheet Iceberg* North Atlantic Sea ice |
genre_facet |
Antarc* Antarctic Hudson Strait Ice Sheet Iceberg* North Atlantic Sea ice |
op_relation |
http://eprints.esc.cam.ac.uk/3233/1/Obrochta%20et%20al.%20-%202014%20-%20Climate%20variability%20and%20ice-sheet%20dynamics%20during.pdf http://eprints.esc.cam.ac.uk/3233/2/1-s2.0-S0012821X14005494-gr001.jpg http://eprints.esc.cam.ac.uk/3233/3/mmc1.pdf http://eprints.esc.cam.ac.uk/3233/4/mmc2.kml Obrochta, Stephen P. and Crowley, Thomas J. and Channell, James E. T. and Hodell, David A. and Baker, Paul A. and Seki, Arisa and Yokoyama, Yusuke (2014) Climate variability and ice-sheet dynamics during the last three glaciations. Earth and Planetary Science Letters, 406. pp. 198-212. ISSN 0012821X DOI https://doi.org/10.1016/j.epsl.2014.09.004 <https://doi.org/10.1016/j.epsl.2014.09.004> |
op_rights |
cc_by cc_by_nd |
op_rightsnorm |
CC-BY CC-BY-ND |
op_doi |
https://doi.org/10.1016/j.epsl.2014.09.004 |
container_title |
Earth and Planetary Science Letters |
container_volume |
406 |
container_start_page |
198 |
op_container_end_page |
212 |
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1766262571575279616 |