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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ftpubmed:oai:pubmedcentral.nih.gov:7776780 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://www.ncbi.nlm.nih.gov/pmc/articles/PMC7776780/ http://www.ncbi.nlm.nih.gov/pubmed/33288724 https://doi.org/10.1073/pnas.2016544117 en eng National Academy of Sciences http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7776780/ http://www.ncbi.nlm.nih.gov/pubmed/33288724 http://dx.doi.org/10.1073/pnas.2016544117 https://www.pnas.org/site/aboutpnas/licenses.xhtmlPublished under the PNAS license (https://www.pnas.org/site/aboutpnas/licenses.xhtml) . Proc Natl Acad Sci U S A Physical Sciences Text 2020 ftpubmed https://doi.org/10.1073/pnas.2016544117 2021-06-13T00:20:52Z 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. Text aleutian low Arctic Arctic Ocean Bering Strait Sea ice Alaska PubMed Central (PMC) Arctic Arctic Ocean Bering Strait Pacific Proceedings of the National Academy of Sciences 117 52 33034 33042 |
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English |
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Physical Sciences |
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Physical Sciences 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 |
topic_facet |
Physical Sciences |
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 |
Text |
author |
Broadman, Ellie Kaufman, Darrell S. Henderson, Andrew C. G. Malmierca-Vallet, Irene Leng, Melanie J. Lacey, Jack H. |
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://www.ncbi.nlm.nih.gov/pmc/articles/PMC7776780/ http://www.ncbi.nlm.nih.gov/pubmed/33288724 https://doi.org/10.1073/pnas.2016544117 |
geographic |
Arctic Arctic Ocean Bering Strait Pacific |
geographic_facet |
Arctic Arctic Ocean Bering Strait Pacific |
genre |
aleutian low Arctic Arctic Ocean Bering Strait Sea ice Alaska |
genre_facet |
aleutian low Arctic Arctic Ocean Bering Strait Sea ice Alaska |
op_source |
Proc Natl Acad Sci U S A |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7776780/ http://www.ncbi.nlm.nih.gov/pubmed/33288724 http://dx.doi.org/10.1073/pnas.2016544117 |
op_rights |
https://www.pnas.org/site/aboutpnas/licenses.xhtmlPublished under the PNAS license (https://www.pnas.org/site/aboutpnas/licenses.xhtml) . |
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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1766265990093471744 |