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...
Published in: | Climate of the Past |
---|---|
Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
|
Subjects: | |
Online Access: | http://hdl.handle.net/2115/67340 https://doi.org/10.5194/cp-13-1111-2017 |
id |
fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/67340 |
---|---|
record_format |
openpolar |
spelling |
fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/67340 2023-05-15T14:51:58+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 http://hdl.handle.net/2115/67340 https://doi.org/10.5194/cp-13-1111-2017 eng eng Copernicus Publications http://hdl.handle.net/2115/67340 Climate of the Past, 13(9): 1111-1127 http://dx.doi.org/10.5194/cp-13-1111-2017 https://creativecommons.org/licenses/by/3.0/ CC-BY 450 article fthokunivhus https://doi.org/10.5194/cp-13-1111-2017 2022-11-18T01:04:25Z 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. Article in Journal/Newspaper Arctic Arctic Ocean Bering Sea Bering Strait canada basin Chukchi Chukchi Sea Sea ice Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Arctic Arctic Ocean Bering Sea Bering Strait Canada Chukchi Sea Climate of the Past 13 9 1111 1127 |
institution |
Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
450 |
spellingShingle |
450 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 |
topic_facet |
450 |
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 |
Article in Journal/Newspaper |
author |
Yamamoto, Masanobu Nam, Seung-Il Polyak, Leonid Kobayashi, Daisuke Suzuki, Kenta Irino, Tomohisa Shimada, Koji |
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 |
publisher |
Copernicus Publications |
url |
http://hdl.handle.net/2115/67340 https://doi.org/10.5194/cp-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_relation |
http://hdl.handle.net/2115/67340 Climate of the Past, 13(9): 1111-1127 http://dx.doi.org/10.5194/cp-13-1111-2017 |
op_rights |
https://creativecommons.org/licenses/by/3.0/ |
op_rightsnorm |
CC-BY |
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_ |
1766323101270802432 |