Late Holocene paleoceanography in the Chukchi and Beaufort Seas, Arctic Ocean, based on benthic foraminifera and ostracodes
Calcareous microfossil assemblages in late Holocene sediments from the western Arctic continental shelf provide an important baseline for evaluating the impacts of today’s changing Arctic oceanography. This study compares 14C-dated late Holocene microfaunal assemblages of sediment cores SWERUS-L2-2-...
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ftuniaarhuspubl:oai:pure.atira.dk:publications/555e5b38-1d10-4faa-9b94-2186f5f9eebb 2023-05-15T14:26:12+02:00 Late Holocene paleoceanography in the Chukchi and Beaufort Seas, Arctic Ocean, based on benthic foraminifera and ostracodes Seidenstein, Julia L. Cronin, Thomas M. Gemery, Laura Keigwin, Lloyd D. Pearce, Christof Jakobsson, Martin Coxall, Helen K. Wei, Emily A. Driscoll, Neal W. 2018-12-01 https://pure.au.dk/portal/da/publications/late-holocene-paleoceanography-in-the-chukchi-and-beaufort-seas-arctic-ocean-based-on-benthic-foraminifera-and-ostracodes(555e5b38-1d10-4faa-9b94-2186f5f9eebb).html https://doi.org/10.1007/s41063-018-0058-7 eng eng info:eu-repo/semantics/restrictedAccess Seidenstein , J L , Cronin , T M , Gemery , L , Keigwin , L D , Pearce , C , Jakobsson , M , Coxall , H K , Wei , E A & Driscoll , N W 2018 , ' Late Holocene paleoceanography in the Chukchi and Beaufort Seas, Arctic Ocean, based on benthic foraminifera and ostracodes ' , Arktos , vol. 4 , no. 1 , 23 . https://doi.org/10.1007/s41063-018-0058-7 article 2018 ftuniaarhuspubl https://doi.org/10.1007/s41063-018-0058-7 2023-03-08T23:56:22Z Calcareous microfossil assemblages in late Holocene sediments from the western Arctic continental shelf provide an important baseline for evaluating the impacts of today’s changing Arctic oceanography. This study compares 14C-dated late Holocene microfaunal assemblages of sediment cores SWERUS-L2-2-PC1, 2-MC4 and 2-KL1 (57 mwd), which record the last 4200 years in the Herald Canyon (Chukchi Sea shelf), and HLY1302-JPC-32, GGC-30, MC-29 (60 mwd), which record the last 3000 years in the Beaufort Sea shelf off the coast of Canada. Foraminiferal and ostracode assemblages are typical of Arctic continental shelf environments with annual sea-ice cover and show relatively small changes in terms of variability of dominant species. Important microfaunal changes in the Beaufort site include a spike in Spiroplectammina biformis coinciding with a decrease in Cassidulina reniforme in the last few centuries suggesting an increase of Pacific Water influence and decreased sea-ice. There is low-amplitude centennial-scale variability in proportions of benthic foraminiferal species, such as C. reniforme. In addition to these species, Cassidulina teretis s.l., Elphidium excavatum clavatum and Stainforthia feylingi are also common at this site. At the Herald Canyon site in the last few centuries, C. reniforme peaks around 150 years BP and then decreases while Spiroplectammina earlandi spikes and Acanthocythereis dunelmensis decreases also suggesting an increase in Pacific Water influence and decreased sea-ice at this site. This site also includes Buccella spp. and Elphidium excavatum clavatum. Differences in benthic foraminifera and ostracode species dominance between the two sites may be due to a greater influence of Pacific Water in the Chukchi shelf, compared to the more distal Beaufort shelf, which is also affected by the Beaufort Gyre and the Mackenzie River. Article in Journal/Newspaper Arctic Arctic Arctic Ocean Beaufort Sea Chukchi Chukchi Sea Foraminifera* Mackenzie river Sea ice Aarhus University: Research Arctic Arctic Ocean Beaufort Shelf ENVELOPE(-142.500,-142.500,70.000,70.000) Canada Chukchi Sea Chukchi Shelf ENVELOPE(-169.167,-169.167,70.550,70.550) Mackenzie River Pacific arktos 4 1 1 17 |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
description |
Calcareous microfossil assemblages in late Holocene sediments from the western Arctic continental shelf provide an important baseline for evaluating the impacts of today’s changing Arctic oceanography. This study compares 14C-dated late Holocene microfaunal assemblages of sediment cores SWERUS-L2-2-PC1, 2-MC4 and 2-KL1 (57 mwd), which record the last 4200 years in the Herald Canyon (Chukchi Sea shelf), and HLY1302-JPC-32, GGC-30, MC-29 (60 mwd), which record the last 3000 years in the Beaufort Sea shelf off the coast of Canada. Foraminiferal and ostracode assemblages are typical of Arctic continental shelf environments with annual sea-ice cover and show relatively small changes in terms of variability of dominant species. Important microfaunal changes in the Beaufort site include a spike in Spiroplectammina biformis coinciding with a decrease in Cassidulina reniforme in the last few centuries suggesting an increase of Pacific Water influence and decreased sea-ice. There is low-amplitude centennial-scale variability in proportions of benthic foraminiferal species, such as C. reniforme. In addition to these species, Cassidulina teretis s.l., Elphidium excavatum clavatum and Stainforthia feylingi are also common at this site. At the Herald Canyon site in the last few centuries, C. reniforme peaks around 150 years BP and then decreases while Spiroplectammina earlandi spikes and Acanthocythereis dunelmensis decreases also suggesting an increase in Pacific Water influence and decreased sea-ice at this site. This site also includes Buccella spp. and Elphidium excavatum clavatum. Differences in benthic foraminifera and ostracode species dominance between the two sites may be due to a greater influence of Pacific Water in the Chukchi shelf, compared to the more distal Beaufort shelf, which is also affected by the Beaufort Gyre and the Mackenzie River. |
format |
Article in Journal/Newspaper |
author |
Seidenstein, Julia L. Cronin, Thomas M. Gemery, Laura Keigwin, Lloyd D. Pearce, Christof Jakobsson, Martin Coxall, Helen K. Wei, Emily A. Driscoll, Neal W. |
spellingShingle |
Seidenstein, Julia L. Cronin, Thomas M. Gemery, Laura Keigwin, Lloyd D. Pearce, Christof Jakobsson, Martin Coxall, Helen K. Wei, Emily A. Driscoll, Neal W. Late Holocene paleoceanography in the Chukchi and Beaufort Seas, Arctic Ocean, based on benthic foraminifera and ostracodes |
author_facet |
Seidenstein, Julia L. Cronin, Thomas M. Gemery, Laura Keigwin, Lloyd D. Pearce, Christof Jakobsson, Martin Coxall, Helen K. Wei, Emily A. Driscoll, Neal W. |
author_sort |
Seidenstein, Julia L. |
title |
Late Holocene paleoceanography in the Chukchi and Beaufort Seas, Arctic Ocean, based on benthic foraminifera and ostracodes |
title_short |
Late Holocene paleoceanography in the Chukchi and Beaufort Seas, Arctic Ocean, based on benthic foraminifera and ostracodes |
title_full |
Late Holocene paleoceanography in the Chukchi and Beaufort Seas, Arctic Ocean, based on benthic foraminifera and ostracodes |
title_fullStr |
Late Holocene paleoceanography in the Chukchi and Beaufort Seas, Arctic Ocean, based on benthic foraminifera and ostracodes |
title_full_unstemmed |
Late Holocene paleoceanography in the Chukchi and Beaufort Seas, Arctic Ocean, based on benthic foraminifera and ostracodes |
title_sort |
late holocene paleoceanography in the chukchi and beaufort seas, arctic ocean, based on benthic foraminifera and ostracodes |
publishDate |
2018 |
url |
https://pure.au.dk/portal/da/publications/late-holocene-paleoceanography-in-the-chukchi-and-beaufort-seas-arctic-ocean-based-on-benthic-foraminifera-and-ostracodes(555e5b38-1d10-4faa-9b94-2186f5f9eebb).html https://doi.org/10.1007/s41063-018-0058-7 |
long_lat |
ENVELOPE(-142.500,-142.500,70.000,70.000) ENVELOPE(-169.167,-169.167,70.550,70.550) |
geographic |
Arctic Arctic Ocean Beaufort Shelf Canada Chukchi Sea Chukchi Shelf Mackenzie River Pacific |
geographic_facet |
Arctic Arctic Ocean Beaufort Shelf Canada Chukchi Sea Chukchi Shelf Mackenzie River Pacific |
genre |
Arctic Arctic Arctic Ocean Beaufort Sea Chukchi Chukchi Sea Foraminifera* Mackenzie river Sea ice |
genre_facet |
Arctic Arctic Arctic Ocean Beaufort Sea Chukchi Chukchi Sea Foraminifera* Mackenzie river Sea ice |
op_source |
Seidenstein , J L , Cronin , T M , Gemery , L , Keigwin , L D , Pearce , C , Jakobsson , M , Coxall , H K , Wei , E A & Driscoll , N W 2018 , ' Late Holocene paleoceanography in the Chukchi and Beaufort Seas, Arctic Ocean, based on benthic foraminifera and ostracodes ' , Arktos , vol. 4 , no. 1 , 23 . https://doi.org/10.1007/s41063-018-0058-7 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1007/s41063-018-0058-7 |
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