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 two sediment cores from the northern Chukchi Sea pr...
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ftcopernicus:oai:publications.copernicus.org:cpd55337 2023-05-15T13:15:05+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 2018-09-26 application/pdf https://doi.org/10.5194/cp-2016-105 https://cp.copernicus.org/preprints/cp-2016-105/ eng eng doi:10.5194/cp-2016-105 https://cp.copernicus.org/preprints/cp-2016-105/ eISSN: 1814-9332 Text 2018 ftcopernicus https://doi.org/10.5194/cp-2016-105 2020-07-20T16:23:56Z 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 two 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, a proxy of the BG strength, gradually decreased during the Holocene, suggesting a long-term decline in the BG strength, consistent with orbitally-controlled decrease in summer insolation. We suppose that the BG rotation weakened as a result of 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, approximated by the chlorite/illite record, shows intensified flow from the Bering Sea to the Arctic during the middle Holocene, which is attributed primarily to the effect of an overall weaker Aleutian Low. This middle Holocene strengthening of the BSI was coeval with intense subpolar gyre circulation in the North Atlantic. We propose that the BSI is linked with the North Atlantic circulation via an atmospheric teleconnection between the Aleutian and Icelandic Lows. A correspondence between the Holocene variability of the BSI and North Atlantic Drift suggests that this connection is involved in a mechanism muting salinity changes in the North Atlantic, and thereby stabilizing the Atlantic Meridional Overturning Circulation. Text aleutian low Arctic Arctic Ocean Bering Sea Bering Strait canada basin Chukchi Chukchi Sea North Atlantic Sea ice Copernicus Publications: E-Journals Arctic Arctic Ocean Bering Sea Bering Strait Canada Chukchi Sea |
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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 two 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, a proxy of the BG strength, gradually decreased during the Holocene, suggesting a long-term decline in the BG strength, consistent with orbitally-controlled decrease in summer insolation. We suppose that the BG rotation weakened as a result of 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, approximated by the chlorite/illite record, shows intensified flow from the Bering Sea to the Arctic during the middle Holocene, which is attributed primarily to the effect of an overall weaker Aleutian Low. This middle Holocene strengthening of the BSI was coeval with intense subpolar gyre circulation in the North Atlantic. We propose that the BSI is linked with the North Atlantic circulation via an atmospheric teleconnection between the Aleutian and Icelandic Lows. A correspondence between the Holocene variability of the BSI and North Atlantic Drift suggests that this connection is involved in a mechanism muting salinity changes in the North Atlantic, and thereby stabilizing the Atlantic Meridional Overturning Circulation. |
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-2016-105 https://cp.copernicus.org/preprints/cp-2016-105/ |
geographic |
Arctic Arctic Ocean Bering Sea Bering Strait Canada Chukchi Sea |
geographic_facet |
Arctic Arctic Ocean Bering Sea Bering Strait Canada Chukchi Sea |
genre |
aleutian low Arctic Arctic Ocean Bering Sea Bering Strait canada basin Chukchi Chukchi Sea North Atlantic Sea ice |
genre_facet |
aleutian low Arctic Arctic Ocean Bering Sea Bering Strait canada basin Chukchi Chukchi Sea North Atlantic Sea ice |
op_source |
eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-2016-105 https://cp.copernicus.org/preprints/cp-2016-105/ |
op_doi |
https://doi.org/10.5194/cp-2016-105 |
_version_ |
1766266882370830336 |