Enhanced iceberg discharge in the western North Atlantic during all Heinrich events of the last glaciation
A series of catastrophic iceberg and meltwater discharges to the North Atlantic, termed Heinrich events, punctuated the last ice age. During Heinrich events, coarse terrigenous debris released from the drifting icebergs was preserved in deep-sea sediments, serving as an indicator of iceberg passage....
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ftcolumbiauniv:oai:academiccommons.columbia.edu:10.7916/tyqg-s038 2023-05-15T16:35:38+02:00 Enhanced iceberg discharge in the western North Atlantic during all Heinrich events of the last glaciation Zhou, Yuxin McManus, Jerry F. Jacobel, Allison W. Costa, Kassandra Maria Wang, Shouyi Alvarez Caraveo, Blanca 2021 https://doi.org/10.7916/tyqg-s038 English eng https://doi.org/10.7916/tyqg-s038 Icebergs Glaciology Pleistocene Geologic Epoch Articles 2021 ftcolumbiauniv https://doi.org/10.7916/tyqg-s038 2022-06-25T22:19:54Z A series of catastrophic iceberg and meltwater discharges to the North Atlantic, termed Heinrich events, punctuated the last ice age. During Heinrich events, coarse terrigenous debris released from the drifting icebergs was preserved in deep-sea sediments, serving as an indicator of iceberg passage. Quantifying the vertical flux of ice-rafted debris (IRD) in open-ocean settings can resolve questions regarding the timing and spatial variation in ice sheet calving intensity. In this study, 230Thxs-based IRD flux throughout the last glacial period was measured in a deep-sea sediment core from the western North Atlantic, and complemented by data spanning 0-32 ka from a sediment core in the Labrador Sea. The cores were recovered from sites downstream from Hudson Strait, a likely conduit for icebergs calving from the Laurentide ice sheet (LIS). We compare our results with equivalent existing data from the eastern North Atlantic and show that the two cores in our study have higher IRD fluxes during all Heinrich events, notably including events H3 (∼31 ka) and H6 (∼60 ka). This study demonstrates that the LIS played a role in all Heinrich events, and raises the likelihood that a single mechanism can account for the genesis of these events. Article in Journal/Newspaper Hudson Strait Ice Sheet Labrador Sea North Atlantic Columbia University: Academic Commons Hudson Hudson Strait ENVELOPE(-70.000,-70.000,62.000,62.000) |
institution |
Open Polar |
collection |
Columbia University: Academic Commons |
op_collection_id |
ftcolumbiauniv |
language |
English |
topic |
Icebergs Glaciology Pleistocene Geologic Epoch |
spellingShingle |
Icebergs Glaciology Pleistocene Geologic Epoch Zhou, Yuxin McManus, Jerry F. Jacobel, Allison W. Costa, Kassandra Maria Wang, Shouyi Alvarez Caraveo, Blanca Enhanced iceberg discharge in the western North Atlantic during all Heinrich events of the last glaciation |
topic_facet |
Icebergs Glaciology Pleistocene Geologic Epoch |
description |
A series of catastrophic iceberg and meltwater discharges to the North Atlantic, termed Heinrich events, punctuated the last ice age. During Heinrich events, coarse terrigenous debris released from the drifting icebergs was preserved in deep-sea sediments, serving as an indicator of iceberg passage. Quantifying the vertical flux of ice-rafted debris (IRD) in open-ocean settings can resolve questions regarding the timing and spatial variation in ice sheet calving intensity. In this study, 230Thxs-based IRD flux throughout the last glacial period was measured in a deep-sea sediment core from the western North Atlantic, and complemented by data spanning 0-32 ka from a sediment core in the Labrador Sea. The cores were recovered from sites downstream from Hudson Strait, a likely conduit for icebergs calving from the Laurentide ice sheet (LIS). We compare our results with equivalent existing data from the eastern North Atlantic and show that the two cores in our study have higher IRD fluxes during all Heinrich events, notably including events H3 (∼31 ka) and H6 (∼60 ka). This study demonstrates that the LIS played a role in all Heinrich events, and raises the likelihood that a single mechanism can account for the genesis of these events. |
format |
Article in Journal/Newspaper |
author |
Zhou, Yuxin McManus, Jerry F. Jacobel, Allison W. Costa, Kassandra Maria Wang, Shouyi Alvarez Caraveo, Blanca |
author_facet |
Zhou, Yuxin McManus, Jerry F. Jacobel, Allison W. Costa, Kassandra Maria Wang, Shouyi Alvarez Caraveo, Blanca |
author_sort |
Zhou, Yuxin |
title |
Enhanced iceberg discharge in the western North Atlantic during all Heinrich events of the last glaciation |
title_short |
Enhanced iceberg discharge in the western North Atlantic during all Heinrich events of the last glaciation |
title_full |
Enhanced iceberg discharge in the western North Atlantic during all Heinrich events of the last glaciation |
title_fullStr |
Enhanced iceberg discharge in the western North Atlantic during all Heinrich events of the last glaciation |
title_full_unstemmed |
Enhanced iceberg discharge in the western North Atlantic during all Heinrich events of the last glaciation |
title_sort |
enhanced iceberg discharge in the western north atlantic during all heinrich events of the last glaciation |
publishDate |
2021 |
url |
https://doi.org/10.7916/tyqg-s038 |
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 Labrador Sea North Atlantic |
genre_facet |
Hudson Strait Ice Sheet Labrador Sea North Atlantic |
op_relation |
https://doi.org/10.7916/tyqg-s038 |
op_doi |
https://doi.org/10.7916/tyqg-s038 |
_version_ |
1766025917683990528 |