气候变化领域集成服务门户(CCPortal): Coupled impacts of sea ice variability and North Pacific atmospheric circulation on Holocene hydroclimate in Arctic Alaska

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DOI	10.1073/PNAS.2016544117
	Coupled impacts of sea ice variability and North Pacific atmospheric circulation on Holocene hydroclimate in Arctic Alaska
	Broadman E.; Kaufman D.S.; Henderson A.C.G.; Malmierca-Vallet I.; Leng M.J.; Lacey J.H.
发表日期	2021
ISSN	00278424
起始页码	33034
结束页码	33042
卷号	117 期号:52
英文摘要	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. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Alaska hydroclimate; Aleutian Low; Arctic sea ice; Holocene; Oxygen isotopes
语种	英语
scopus关键词	isotope; Alaska; Arctic Ocean; Article; atmospheric dispersion; atmospheric moisture; climate change; controlled study; diatom; dry season; environmental impact; Holocene; hydroclimate; North Pacific gyre; paleoclimatology; priority journal; rainy season; reduction (chemistry); sea ice; water transport
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/179637
作者单位	School of Earth and Sustainability, Northern Arizona University, Flagstaff, AZ 86011, United States; School of Geography, Politics and Sociology, Newcastle University, Newcastle upon Tyne, NE1 7RU, United Kingdom; British Antarctic Survey, Cambridge, CB3 0ET, United Kingdom; School of Geographical Sciences, University of Bristol, Bristol, BS8 1TL, United Kingdom; National Environmental Isotope Facility, Isotope Geosciences Facility, British Geological Survey, Keyworth, NG12 5GG, United Kingdom; Centre for Environmental Geochemistry, School of Biosciences, University of Nottingham, Loughborough, LE12 5RD, United Kingdom
推荐引用方式 GB/T 7714	Broadman E.,Kaufman D.S.,Henderson A.C.G.,et al. Coupled impacts of sea ice variability and North Pacific atmospheric circulation on Holocene hydroclimate in Arctic Alaska[J],2021,117(52).
APA	Broadman E.,Kaufman D.S.,Henderson A.C.G.,Malmierca-Vallet I.,Leng M.J.,&Lacey J.H..(2021).Coupled impacts of sea ice variability and North Pacific atmospheric circulation on Holocene hydroclimate in Arctic Alaska.Proceedings of the National Academy of Sciences of the United States of America,117(52).
MLA	Broadman E.,et al."Coupled impacts of sea ice variability and North Pacific atmospheric circulation on Holocene hydroclimate in Arctic Alaska".Proceedings of the National Academy of Sciences of the United States of America 117.52(2021).