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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ftuglasgow:oai:eprints.gla.ac.uk:205249 2023-05-15T16:35:39+02:00 Anatomy of Heinrich Layer 1 and its role in the last deglaciation Hodell, David A. Nicholl, Joseph A. Bontognali, Tomaso R.R. Danino, Steffan Dorador, Javier Dowdeswell, Julian A. Einsle, Joshua Kuhlmann, Holger Martrat, Belen Mleneck-Vautravers, Maryline J. Rodríguez-Tovar, Francisco Javier Röhl, Ursula 2017-03 text http://eprints.gla.ac.uk/205249/ http://eprints.gla.ac.uk/205249/1/205249.pdf en eng Wiley http://eprints.gla.ac.uk/205249/1/205249.pdf Hodell, D. A. et al. (2017) Anatomy of Heinrich Layer 1 and its role in the last deglaciation. Paleoceanography <http://eprints.gla.ac.uk/view/journal_volume/Paleoceanography.html>, 32(3), pp. 284-303. (doi:10.1002/2016PA003028 <http://dx.doi.org/10.1002/2016PA003028>) Articles PeerReviewed 2017 ftuglasgow https://doi.org/10.1002/2016PA003028 2020-03-12T23:15:52Z 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). Article in Journal/Newspaper Hudson Strait Ice Sheet North Atlantic University of Glasgow: Enlighten - Publications Hudson Hudson Strait ENVELOPE(-70.000,-70.000,62.000,62.000) Paleoceanography 32 3 284 303 |
institution |
Open Polar |
collection |
University of Glasgow: Enlighten - Publications |
op_collection_id |
ftuglasgow |
language |
English |
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). |
format |
Article in Journal/Newspaper |
author |
Hodell, David A. Nicholl, Joseph A. Bontognali, Tomaso R.R. Danino, Steffan Dorador, Javier Dowdeswell, Julian A. Einsle, Joshua Kuhlmann, Holger Martrat, Belen Mleneck-Vautravers, Maryline J. Rodríguez-Tovar, Francisco Javier Röhl, Ursula |
spellingShingle |
Hodell, David A. Nicholl, Joseph A. Bontognali, Tomaso R.R. Danino, Steffan Dorador, Javier Dowdeswell, Julian A. Einsle, Joshua 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 |
author_facet |
Hodell, David A. Nicholl, Joseph A. Bontognali, Tomaso R.R. Danino, Steffan Dorador, Javier Dowdeswell, Julian A. Einsle, Joshua 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 |
publishDate |
2017 |
url |
http://eprints.gla.ac.uk/205249/ http://eprints.gla.ac.uk/205249/1/205249.pdf |
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 |
http://eprints.gla.ac.uk/205249/1/205249.pdf Hodell, D. A. et al. (2017) Anatomy of Heinrich Layer 1 and its role in the last deglaciation. Paleoceanography <http://eprints.gla.ac.uk/view/journal_volume/Paleoceanography.html>, 32(3), pp. 284-303. (doi:10.1002/2016PA003028 <http://dx.doi.org/10.1002/2016PA003028>) |
op_doi |
https://doi.org/10.1002/2016PA003028 |
container_title |
Paleoceanography |
container_volume |
32 |
container_issue |
3 |
container_start_page |
284 |
op_container_end_page |
303 |
_version_ |
1766025920906264576 |