Coupled impacts of sea ice variability and North Pacific atmospheric circulation on Holocene hydroclimate in Arctic Alaska.
Arctic Alaska lies at a climatological crossroads between the Arctic and North Pacific Oceans. The modern hydroclimate of the region is responding to rapidly diminishing sea ice, driven in part by changes in heat flux from the North Pacific. Paleoclimate reconstructions have improved our knowledge o...
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ftnerc:oai:nora.nerc.ac.uk:529415 2023-05-15T13:14:54+02:00 Coupled impacts of sea ice variability and North Pacific atmospheric circulation on Holocene hydroclimate in Arctic Alaska. Broadman, Ellie Kaufman, Darrell S. Henderson, Andrew C.G. Malmierca Vallet, Irene Leng, Melanie J. Lacey, Jack H. 2020-12-29 http://nora.nerc.ac.uk/id/eprint/529415/ https://www.pnas.org/content/117/52/33034 unknown National Academy of Sciences Broadman, Ellie; Kaufman, Darrell S.; Henderson, Andrew C.G.; Malmierca Vallet, Irene orcid:0000-0002-2871-9741 Leng, Melanie J. orcid:0000-0003-1115-5166 Lacey, Jack H. 2020 Coupled impacts of sea ice variability and North Pacific atmospheric circulation on Holocene hydroclimate in Arctic Alaska. Proceedings of the National Academy of Sciences, 117 (52). 33034-33042. https://doi.org/10.1073/pnas.2016544117 <https://doi.org/10.1073/pnas.2016544117> Publication - Article PeerReviewed 2020 ftnerc https://doi.org/10.1073/pnas.2016544117 2023-02-24T00:02:01Z Arctic Alaska lies at a climatological crossroads between the Arctic and North Pacific Oceans. The modern hydroclimate of the region is responding to rapidly diminishing sea ice, driven in part by changes in heat flux from the North Pacific. Paleoclimate reconstructions have improved our knowledge of Alaska's hydroclimate, but no studies have examined Holocene sea ice, moisture, and ocean-atmosphere circulation in Arctic Alaska, limiting our understanding of the relationship between these phenomena in the past. Here we present a sedimentary diatom assemblage and diatom isotope dataset from Schrader Pond, located ∼80 km from the Arctic Ocean, which we interpret alongside synthesized regional records of Holocene hydroclimate and sea ice reduction scenarios modeled by the Hadley Centre Coupled Model Version 3 (HadCM3). The paleodata synthesis and model simulations suggest the Early and Middle Holocene in Arctic Alaska were characterized by less sea ice, a greater contribution of isotopically heavy Arctic-derived moisture, and wetter climate. In the Late Holocene, sea ice expanded and regional climate became drier. This climatic transition is coincident with a documented shift in North Pacific circulation involving the Aleutian Low at ∼4 ka, suggesting a Holocene teleconnection between the North Pacific and Arctic. The HadCM3 simulations reveal that reduced sea ice leads to a strengthened Aleutian Low shifted west, potentially increasing transport of warm North Pacific water to the Arctic through the Bering Strait. Our findings demonstrate the interconnectedness of the Arctic and North Pacific on multimillennial timescales, and are consistent with future projections of less sea ice and more precipitation in Arctic Alaska. Article in Journal/Newspaper aleutian low Arctic Arctic Arctic Ocean Bering Strait Sea ice Alaska Natural Environment Research Council: NERC Open Research Archive Arctic Arctic Ocean Bering Strait Pacific Proceedings of the National Academy of Sciences 117 52 33034 33042 |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
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description |
Arctic Alaska lies at a climatological crossroads between the Arctic and North Pacific Oceans. The modern hydroclimate of the region is responding to rapidly diminishing sea ice, driven in part by changes in heat flux from the North Pacific. Paleoclimate reconstructions have improved our knowledge of Alaska's hydroclimate, but no studies have examined Holocene sea ice, moisture, and ocean-atmosphere circulation in Arctic Alaska, limiting our understanding of the relationship between these phenomena in the past. Here we present a sedimentary diatom assemblage and diatom isotope dataset from Schrader Pond, located ∼80 km from the Arctic Ocean, which we interpret alongside synthesized regional records of Holocene hydroclimate and sea ice reduction scenarios modeled by the Hadley Centre Coupled Model Version 3 (HadCM3). The paleodata synthesis and model simulations suggest the Early and Middle Holocene in Arctic Alaska were characterized by less sea ice, a greater contribution of isotopically heavy Arctic-derived moisture, and wetter climate. In the Late Holocene, sea ice expanded and regional climate became drier. This climatic transition is coincident with a documented shift in North Pacific circulation involving the Aleutian Low at ∼4 ka, suggesting a Holocene teleconnection between the North Pacific and Arctic. The HadCM3 simulations reveal that reduced sea ice leads to a strengthened Aleutian Low shifted west, potentially increasing transport of warm North Pacific water to the Arctic through the Bering Strait. Our findings demonstrate the interconnectedness of the Arctic and North Pacific on multimillennial timescales, and are consistent with future projections of less sea ice and more precipitation in Arctic Alaska. |
format |
Article in Journal/Newspaper |
author |
Broadman, Ellie Kaufman, Darrell S. Henderson, Andrew C.G. Malmierca Vallet, Irene Leng, Melanie J. Lacey, Jack H. |
spellingShingle |
Broadman, Ellie Kaufman, Darrell S. Henderson, Andrew C.G. Malmierca Vallet, Irene Leng, Melanie J. Lacey, Jack H. Coupled impacts of sea ice variability and North Pacific atmospheric circulation on Holocene hydroclimate in Arctic Alaska. |
author_facet |
Broadman, Ellie Kaufman, Darrell S. Henderson, Andrew C.G. Malmierca Vallet, Irene Leng, Melanie J. Lacey, Jack H. |
author_sort |
Broadman, Ellie |
title |
Coupled impacts of sea ice variability and North Pacific atmospheric circulation on Holocene hydroclimate in Arctic Alaska. |
title_short |
Coupled impacts of sea ice variability and North Pacific atmospheric circulation on Holocene hydroclimate in Arctic Alaska. |
title_full |
Coupled impacts of sea ice variability and North Pacific atmospheric circulation on Holocene hydroclimate in Arctic Alaska. |
title_fullStr |
Coupled impacts of sea ice variability and North Pacific atmospheric circulation on Holocene hydroclimate in Arctic Alaska. |
title_full_unstemmed |
Coupled impacts of sea ice variability and North Pacific atmospheric circulation on Holocene hydroclimate in Arctic Alaska. |
title_sort |
coupled impacts of sea ice variability and north pacific atmospheric circulation on holocene hydroclimate in arctic alaska. |
publisher |
National Academy of Sciences |
publishDate |
2020 |
url |
http://nora.nerc.ac.uk/id/eprint/529415/ https://www.pnas.org/content/117/52/33034 |
geographic |
Arctic Arctic Ocean Bering Strait Pacific |
geographic_facet |
Arctic Arctic Ocean Bering Strait Pacific |
genre |
aleutian low Arctic Arctic Arctic Ocean Bering Strait Sea ice Alaska |
genre_facet |
aleutian low Arctic Arctic Arctic Ocean Bering Strait Sea ice Alaska |
op_relation |
Broadman, Ellie; Kaufman, Darrell S.; Henderson, Andrew C.G.; Malmierca Vallet, Irene orcid:0000-0002-2871-9741 Leng, Melanie J. orcid:0000-0003-1115-5166 Lacey, Jack H. 2020 Coupled impacts of sea ice variability and North Pacific atmospheric circulation on Holocene hydroclimate in Arctic Alaska. Proceedings of the National Academy of Sciences, 117 (52). 33034-33042. https://doi.org/10.1073/pnas.2016544117 <https://doi.org/10.1073/pnas.2016544117> |
op_doi |
https://doi.org/10.1073/pnas.2016544117 |
container_title |
Proceedings of the National Academy of Sciences |
container_volume |
117 |
container_issue |
52 |
container_start_page |
33034 |
op_container_end_page |
33042 |
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1766265992574402560 |