Early to mid-Holocene Atlantic water influx and deglacial meltwater events, Beaufort Sea Slope, Arctic Ocean
Holocene high-resolution cores from the margin of the Arctic Ocean are rare. Core P189AR-P45 collected in 405-m water depth on the Beaufort Sea slope, west of the Mackenzie River delta (70°33.03′N and 141°52.08′W), is in close vertical proximity to the present-day upper limit of modified Atlantic wa...
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Cambridge University Press (CUP)
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crcambridgeupr:10.1016/j.yqres.2003.08.003 2024-06-09T07:43:52+00:00 Early to mid-Holocene Atlantic water influx and deglacial meltwater events, Beaufort Sea Slope, Arctic Ocean Andrews, John T. Dunhill, Gita 2004 http://dx.doi.org/10.1016/j.yqres.2003.08.003 http://api.elsevier.com/content/article/PII:S0033589403001352?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589403001352?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400012709 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 61, issue 1, page 14-21 ISSN 0033-5894 1096-0287 journal-article 2004 crcambridgeupr https://doi.org/10.1016/j.yqres.2003.08.003 2024-05-15T13:05:57Z Holocene high-resolution cores from the margin of the Arctic Ocean are rare. Core P189AR-P45 collected in 405-m water depth on the Beaufort Sea slope, west of the Mackenzie River delta (70°33.03′N and 141°52.08′W), is in close vertical proximity to the present-day upper limit of modified Atlantic water. The 5.11-m core spans the interval between ∼6800 and 10,400 14 C yr B.P. (with an 800-yr ocean reservoir correction). The sediment is primarily silty clay with an average grain-size of 9 φ. The chronology is constrained by seven radiocarbon dates. The rate of sediment accumulation averaged 1.35 mm/yr. Stable isotopic data (δ 18 O and δ 13 C) were obtained on the polar planktonic foraminifera Neogloboquadrina pachyderma (s) and the benthic infaunal species Cassidulina neoteretis . A distinct low-δ 18 O event is captured in both the benthic and planktonic data at ∼10,000 14 C yr B.P.—probably recording the glacial Lake Agassiz outburst flood associated with the North Atlantic preboreal cold event. The benthic foraminifera are dominated in the earliest Holocene by C. neoteretis , a species associated with modified Atlantic water masses. This species decreases toward the core top with a marked environmental reversal occurring ∼7800 14 C yr B.P. possibly coincident with the northern hemisphere 8200 cal yr B.P. cold event. Article in Journal/Newspaper Arctic Arctic Ocean Beaufort Sea Foraminifera* Mackenzie river Neogloboquadrina pachyderma North Atlantic Planktonic foraminifera Cambridge University Press Arctic Arctic Ocean Mackenzie River Glacial Lake ENVELOPE(-129.463,-129.463,58.259,58.259) Quaternary Research 61 1 14 21 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
Holocene high-resolution cores from the margin of the Arctic Ocean are rare. Core P189AR-P45 collected in 405-m water depth on the Beaufort Sea slope, west of the Mackenzie River delta (70°33.03′N and 141°52.08′W), is in close vertical proximity to the present-day upper limit of modified Atlantic water. The 5.11-m core spans the interval between ∼6800 and 10,400 14 C yr B.P. (with an 800-yr ocean reservoir correction). The sediment is primarily silty clay with an average grain-size of 9 φ. The chronology is constrained by seven radiocarbon dates. The rate of sediment accumulation averaged 1.35 mm/yr. Stable isotopic data (δ 18 O and δ 13 C) were obtained on the polar planktonic foraminifera Neogloboquadrina pachyderma (s) and the benthic infaunal species Cassidulina neoteretis . A distinct low-δ 18 O event is captured in both the benthic and planktonic data at ∼10,000 14 C yr B.P.—probably recording the glacial Lake Agassiz outburst flood associated with the North Atlantic preboreal cold event. The benthic foraminifera are dominated in the earliest Holocene by C. neoteretis , a species associated with modified Atlantic water masses. This species decreases toward the core top with a marked environmental reversal occurring ∼7800 14 C yr B.P. possibly coincident with the northern hemisphere 8200 cal yr B.P. cold event. |
format |
Article in Journal/Newspaper |
author |
Andrews, John T. Dunhill, Gita |
spellingShingle |
Andrews, John T. Dunhill, Gita Early to mid-Holocene Atlantic water influx and deglacial meltwater events, Beaufort Sea Slope, Arctic Ocean |
author_facet |
Andrews, John T. Dunhill, Gita |
author_sort |
Andrews, John T. |
title |
Early to mid-Holocene Atlantic water influx and deglacial meltwater events, Beaufort Sea Slope, Arctic Ocean |
title_short |
Early to mid-Holocene Atlantic water influx and deglacial meltwater events, Beaufort Sea Slope, Arctic Ocean |
title_full |
Early to mid-Holocene Atlantic water influx and deglacial meltwater events, Beaufort Sea Slope, Arctic Ocean |
title_fullStr |
Early to mid-Holocene Atlantic water influx and deglacial meltwater events, Beaufort Sea Slope, Arctic Ocean |
title_full_unstemmed |
Early to mid-Holocene Atlantic water influx and deglacial meltwater events, Beaufort Sea Slope, Arctic Ocean |
title_sort |
early to mid-holocene atlantic water influx and deglacial meltwater events, beaufort sea slope, arctic ocean |
publisher |
Cambridge University Press (CUP) |
publishDate |
2004 |
url |
http://dx.doi.org/10.1016/j.yqres.2003.08.003 http://api.elsevier.com/content/article/PII:S0033589403001352?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589403001352?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400012709 |
long_lat |
ENVELOPE(-129.463,-129.463,58.259,58.259) |
geographic |
Arctic Arctic Ocean Mackenzie River Glacial Lake |
geographic_facet |
Arctic Arctic Ocean Mackenzie River Glacial Lake |
genre |
Arctic Arctic Ocean Beaufort Sea Foraminifera* Mackenzie river Neogloboquadrina pachyderma North Atlantic Planktonic foraminifera |
genre_facet |
Arctic Arctic Ocean Beaufort Sea Foraminifera* Mackenzie river Neogloboquadrina pachyderma North Atlantic Planktonic foraminifera |
op_source |
Quaternary Research volume 61, issue 1, page 14-21 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1016/j.yqres.2003.08.003 |
container_title |
Quaternary Research |
container_volume |
61 |
container_issue |
1 |
container_start_page |
14 |
op_container_end_page |
21 |
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1801372711692271616 |