Anatomy of Heinrich Layer 1 and its role in the last deglaciation
X-ray fluorescence (XRF) core scanning and X-ray computed tomography data were measured every 1 mm to study the structure of Heinrich Event 1 during the last deglaciation at International Ocean Discovery Program Site U1308. Heinrich Layer 1 comprises two distinct layers of ice-rafted detritus (IRD),...
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Online Access: | http://hdl.handle.net/10261/152051 https://doi.org/10.1002/2016PA003028 https://doi.org/10.13039/501100000781 |
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ftcsic:oai:digital.csic.es:10261/152051 2024-02-11T10:04:36+01:00 Anatomy of Heinrich Layer 1 and its role in the last deglaciation Hodell, David A. Nicholl, Joseph A.L. Bontognali, Tomaso R.R. Danino, Steffan Dorador, Javier Dowdeswell, Julian A. Einsle, Joshua F. Kuhlmann, Holger Martrat, Belen Mleneck-Vautravers, Maryline J. Rodríguez-Tovar, Francisco Javier Röhl, Ursula European Research Council 2017-03-01 http://hdl.handle.net/10261/152051 https://doi.org/10.1002/2016PA003028 https://doi.org/10.13039/501100000781 en eng Wiley-Blackwell #PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/EC/FP7/320750 Publisher's version 10.1002/2016PA003028 Sí Paleoceanography 32 (3): 284-303 (2017) http://hdl.handle.net/10261/152051 doi:10.1002/2016PA003028 http://dx.doi.org/10.13039/501100000781 open Deglaciation Heinrich event North Atlantic Paleoclimate artículo http://purl.org/coar/resource_type/c_6501 2017 ftcsic https://doi.org/10.1002/2016PA00302810.13039/501100000781 2024-01-16T10:24:14Z X-ray fluorescence (XRF) core scanning and X-ray computed tomography data were measured every 1 mm to study the structure of Heinrich Event 1 during the last deglaciation at International Ocean Discovery Program Site U1308. Heinrich Layer 1 comprises two distinct layers of ice-rafted detritus (IRD), which are rich in detrital carbonate (DC) and poor in foraminifera. Each DC layer consists of poorly sorted, coarse-grained clasts of IRD embedded in a dense, fine-grained matrix of glacial rock flour that is partially cemented. The radiocarbon ages of foraminifera at the base of the two layers indicate a difference of 1400 14C years, suggesting that they are two distinct events, but the calendar ages depend upon assumptions made for surface reservoir ages. The double peak indicates at least two distinct stages of discharge of the ice streams that drained the Laurentide Ice Sheet through Hudson Strait during HE1 or, alternatively, the discharge of two independent ice streams containing detrital carbonate. Heinrich Event 1.1 was the larger of the two events and began at ~16.2 ka (15.5–17.1 ka) when the polar North Atlantic was already cold and Atlantic Meridional Overturning Circulation (AMOC) weakened. The younger peak (H1.2) at ~15.1 ka (14.3 to 15.9 ka) was a weaker event than H1.1 that was accompanied by minor cooling. Our results support a complex history for Heinrich Stadial 1 (HS1) with reduction in AMOC during the early part (~20–16.2 ka) possibly driven by melting of European ice sheets, whereas the Laurentide Ice Sheet assumed a greater role during the latter half (~16.2–14.7 ka). ©2017. American Geophysical Union. All Rights Reserved. We thank Nick Evans and Giulio Lampronti for XRD analysis and Vera Lukies (MARUM) for assistance with XRF core scanning. David Naafs and an anonymous referee substantially improved the manuscript through their detailed reviews. This research used data acquired at the XRF Core Scanner Lab at the MARUM–Center for Marine Environmental Sciences, University of Bremen, Germany. ... Article in Journal/Newspaper Hudson Strait Ice Sheet North Atlantic Digital.CSIC (Spanish National Research Council) Hudson Hudson Strait ENVELOPE(-70.000,-70.000,62.000,62.000) Paleoceanography 32 3 284 303 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Deglaciation Heinrich event North Atlantic Paleoclimate |
spellingShingle |
Deglaciation Heinrich event North Atlantic Paleoclimate Hodell, David A. Nicholl, Joseph A.L. Bontognali, Tomaso R.R. Danino, Steffan Dorador, Javier Dowdeswell, Julian A. Einsle, Joshua F. Kuhlmann, Holger Martrat, Belen Mleneck-Vautravers, Maryline J. Rodríguez-Tovar, Francisco Javier Röhl, Ursula Anatomy of Heinrich Layer 1 and its role in the last deglaciation |
topic_facet |
Deglaciation Heinrich event North Atlantic Paleoclimate |
description |
X-ray fluorescence (XRF) core scanning and X-ray computed tomography data were measured every 1 mm to study the structure of Heinrich Event 1 during the last deglaciation at International Ocean Discovery Program Site U1308. Heinrich Layer 1 comprises two distinct layers of ice-rafted detritus (IRD), which are rich in detrital carbonate (DC) and poor in foraminifera. Each DC layer consists of poorly sorted, coarse-grained clasts of IRD embedded in a dense, fine-grained matrix of glacial rock flour that is partially cemented. The radiocarbon ages of foraminifera at the base of the two layers indicate a difference of 1400 14C years, suggesting that they are two distinct events, but the calendar ages depend upon assumptions made for surface reservoir ages. The double peak indicates at least two distinct stages of discharge of the ice streams that drained the Laurentide Ice Sheet through Hudson Strait during HE1 or, alternatively, the discharge of two independent ice streams containing detrital carbonate. Heinrich Event 1.1 was the larger of the two events and began at ~16.2 ka (15.5–17.1 ka) when the polar North Atlantic was already cold and Atlantic Meridional Overturning Circulation (AMOC) weakened. The younger peak (H1.2) at ~15.1 ka (14.3 to 15.9 ka) was a weaker event than H1.1 that was accompanied by minor cooling. Our results support a complex history for Heinrich Stadial 1 (HS1) with reduction in AMOC during the early part (~20–16.2 ka) possibly driven by melting of European ice sheets, whereas the Laurentide Ice Sheet assumed a greater role during the latter half (~16.2–14.7 ka). ©2017. American Geophysical Union. All Rights Reserved. We thank Nick Evans and Giulio Lampronti for XRD analysis and Vera Lukies (MARUM) for assistance with XRF core scanning. David Naafs and an anonymous referee substantially improved the manuscript through their detailed reviews. This research used data acquired at the XRF Core Scanner Lab at the MARUM–Center for Marine Environmental Sciences, University of Bremen, Germany. ... |
author2 |
European Research Council |
format |
Article in Journal/Newspaper |
author |
Hodell, David A. Nicholl, Joseph A.L. Bontognali, Tomaso R.R. Danino, Steffan Dorador, Javier Dowdeswell, Julian A. Einsle, Joshua F. Kuhlmann, Holger Martrat, Belen Mleneck-Vautravers, Maryline J. Rodríguez-Tovar, Francisco Javier Röhl, Ursula |
author_facet |
Hodell, David A. Nicholl, Joseph A.L. Bontognali, Tomaso R.R. Danino, Steffan Dorador, Javier Dowdeswell, Julian A. Einsle, Joshua F. Kuhlmann, Holger Martrat, Belen Mleneck-Vautravers, Maryline J. Rodríguez-Tovar, Francisco Javier Röhl, Ursula |
author_sort |
Hodell, David A. |
title |
Anatomy of Heinrich Layer 1 and its role in the last deglaciation |
title_short |
Anatomy of Heinrich Layer 1 and its role in the last deglaciation |
title_full |
Anatomy of Heinrich Layer 1 and its role in the last deglaciation |
title_fullStr |
Anatomy of Heinrich Layer 1 and its role in the last deglaciation |
title_full_unstemmed |
Anatomy of Heinrich Layer 1 and its role in the last deglaciation |
title_sort |
anatomy of heinrich layer 1 and its role in the last deglaciation |
publisher |
Wiley-Blackwell |
publishDate |
2017 |
url |
http://hdl.handle.net/10261/152051 https://doi.org/10.1002/2016PA003028 https://doi.org/10.13039/501100000781 |
long_lat |
ENVELOPE(-70.000,-70.000,62.000,62.000) |
geographic |
Hudson Hudson Strait |
geographic_facet |
Hudson Hudson Strait |
genre |
Hudson Strait Ice Sheet North Atlantic |
genre_facet |
Hudson Strait Ice Sheet North Atlantic |
op_relation |
#PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/EC/FP7/320750 Publisher's version 10.1002/2016PA003028 Sí Paleoceanography 32 (3): 284-303 (2017) http://hdl.handle.net/10261/152051 doi:10.1002/2016PA003028 http://dx.doi.org/10.13039/501100000781 |
op_rights |
open |
op_doi |
https://doi.org/10.1002/2016PA00302810.13039/501100000781 |
container_title |
Paleoceanography |
container_volume |
32 |
container_issue |
3 |
container_start_page |
284 |
op_container_end_page |
303 |
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1790601268119470080 |