Holocene dynamics in the Bering Strait inflow to the Arctic and the Beaufort Gyre circulation based on sedimentary records from the Chukchi Sea
The Beaufort Gyre (BG) and the Bering Strait inflow (BSI) are important elements of the Arctic Ocean circulation system and major controls on the distribution of Arctic sea ice. We report records of the quartz ∕ feldspar and chlorite ∕ illite ratios in three sediment cores from the northern Chukchi...
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ftcopernicus:oai:publications.copernicus.org:cp58281 2023-05-15T14:51:59+02:00 Holocene dynamics in the Bering Strait inflow to the Arctic and the Beaufort Gyre circulation based on sedimentary records from the Chukchi Sea Yamamoto, Masanobu Nam, Seung-Il Polyak, Leonid Kobayashi, Daisuke Suzuki, Kenta Irino, Tomohisa Shimada, Koji 2018-09-27 application/pdf https://doi.org/10.5194/cp-13-1111-2017 https://cp.copernicus.org/articles/13/1111/2017/ eng eng doi:10.5194/cp-13-1111-2017 https://cp.copernicus.org/articles/13/1111/2017/ eISSN: 1814-9332 Text 2018 ftcopernicus https://doi.org/10.5194/cp-13-1111-2017 2020-07-20T16:23:37Z The Beaufort Gyre (BG) and the Bering Strait inflow (BSI) are important elements of the Arctic Ocean circulation system and major controls on the distribution of Arctic sea ice. We report records of the quartz ∕ feldspar and chlorite ∕ illite ratios in three sediment cores from the northern Chukchi Sea, providing insights into the long-term dynamics of the BG circulation and the BSI during the Holocene. The quartz ∕ feldspar ratio, interpreted as a proxy of the BG strength, gradually decreased during the Holocene, suggesting a long-term decline in the BG strength, consistent with an orbitally controlled decrease in summer insolation. We propose that the BG rotation weakened as a result of the increasing stability of sea-ice cover at the margins of the Canada Basin, driven by decreasing insolation. Millennial to multi-centennial variability in the quartz ∕ feldspar ratio (the BG circulation) is consistent with fluctuations in solar irradiance, suggesting that solar activity affected the BG strength on these timescales. The BSI approximation by the chlorite ∕ illite record, despite a considerable geographic variability, consistently shows intensified flow from the Bering Sea to the Arctic during the middle Holocene, which is attributed primarily to the effect of higher atmospheric pressure over the Aleutian Basin. The intensified BSI was associated with decrease in sea-ice concentrations and increase in marine production, as indicated by biomarker concentrations, suggesting a major influence of the BSI on sea-ice and biological conditions in the Chukchi Sea. Multi-century to millennial fluctuations, presumably controlled by solar activity, were also identified in a proxy-based BSI record characterized by the highest age resolution. Text Arctic Arctic Ocean Bering Sea Bering Strait canada basin Chukchi Chukchi Sea Sea ice Copernicus Publications: E-Journals Arctic Arctic Ocean Bering Sea Bering Strait Canada Chukchi Sea Climate of the Past 13 9 1111 1127 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
The Beaufort Gyre (BG) and the Bering Strait inflow (BSI) are important elements of the Arctic Ocean circulation system and major controls on the distribution of Arctic sea ice. We report records of the quartz ∕ feldspar and chlorite ∕ illite ratios in three sediment cores from the northern Chukchi Sea, providing insights into the long-term dynamics of the BG circulation and the BSI during the Holocene. The quartz ∕ feldspar ratio, interpreted as a proxy of the BG strength, gradually decreased during the Holocene, suggesting a long-term decline in the BG strength, consistent with an orbitally controlled decrease in summer insolation. We propose that the BG rotation weakened as a result of the increasing stability of sea-ice cover at the margins of the Canada Basin, driven by decreasing insolation. Millennial to multi-centennial variability in the quartz ∕ feldspar ratio (the BG circulation) is consistent with fluctuations in solar irradiance, suggesting that solar activity affected the BG strength on these timescales. The BSI approximation by the chlorite ∕ illite record, despite a considerable geographic variability, consistently shows intensified flow from the Bering Sea to the Arctic during the middle Holocene, which is attributed primarily to the effect of higher atmospheric pressure over the Aleutian Basin. The intensified BSI was associated with decrease in sea-ice concentrations and increase in marine production, as indicated by biomarker concentrations, suggesting a major influence of the BSI on sea-ice and biological conditions in the Chukchi Sea. Multi-century to millennial fluctuations, presumably controlled by solar activity, were also identified in a proxy-based BSI record characterized by the highest age resolution. |
format |
Text |
author |
Yamamoto, Masanobu Nam, Seung-Il Polyak, Leonid Kobayashi, Daisuke Suzuki, Kenta Irino, Tomohisa Shimada, Koji |
spellingShingle |
Yamamoto, Masanobu Nam, Seung-Il Polyak, Leonid Kobayashi, Daisuke Suzuki, Kenta Irino, Tomohisa Shimada, Koji Holocene dynamics in the Bering Strait inflow to the Arctic and the Beaufort Gyre circulation based on sedimentary records from the Chukchi Sea |
author_facet |
Yamamoto, Masanobu Nam, Seung-Il Polyak, Leonid Kobayashi, Daisuke Suzuki, Kenta Irino, Tomohisa Shimada, Koji |
author_sort |
Yamamoto, Masanobu |
title |
Holocene dynamics in the Bering Strait inflow to the Arctic and the Beaufort Gyre circulation based on sedimentary records from the Chukchi Sea |
title_short |
Holocene dynamics in the Bering Strait inflow to the Arctic and the Beaufort Gyre circulation based on sedimentary records from the Chukchi Sea |
title_full |
Holocene dynamics in the Bering Strait inflow to the Arctic and the Beaufort Gyre circulation based on sedimentary records from the Chukchi Sea |
title_fullStr |
Holocene dynamics in the Bering Strait inflow to the Arctic and the Beaufort Gyre circulation based on sedimentary records from the Chukchi Sea |
title_full_unstemmed |
Holocene dynamics in the Bering Strait inflow to the Arctic and the Beaufort Gyre circulation based on sedimentary records from the Chukchi Sea |
title_sort |
holocene dynamics in the bering strait inflow to the arctic and the beaufort gyre circulation based on sedimentary records from the chukchi sea |
publishDate |
2018 |
url |
https://doi.org/10.5194/cp-13-1111-2017 https://cp.copernicus.org/articles/13/1111/2017/ |
geographic |
Arctic Arctic Ocean Bering Sea Bering Strait Canada Chukchi Sea |
geographic_facet |
Arctic Arctic Ocean Bering Sea Bering Strait Canada Chukchi Sea |
genre |
Arctic Arctic Ocean Bering Sea Bering Strait canada basin Chukchi Chukchi Sea Sea ice |
genre_facet |
Arctic Arctic Ocean Bering Sea Bering Strait canada basin Chukchi Chukchi Sea Sea ice |
op_source |
eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-13-1111-2017 https://cp.copernicus.org/articles/13/1111/2017/ |
op_doi |
https://doi.org/10.5194/cp-13-1111-2017 |
container_title |
Climate of the Past |
container_volume |
13 |
container_issue |
9 |
container_start_page |
1111 |
op_container_end_page |
1127 |
_version_ |
1766323116397559808 |