气候变化领域集成服务门户(CCPortal): Insights Into Changing Interglacial Conditions in Subarctic Canada From MIS 11 Through MIS 5e From Seasonally Resolved Speleothem Records

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DOI	10.1029/2024GL108459
	Insights Into Changing Interglacial Conditions in Subarctic Canada From MIS 11 Through MIS 5e From Seasonally Resolved Speleothem Records
	Batchelor, Cameron J.; McGee, David; Shakun, Jeremy D.; Woodhead, Jon; Jost, Adam B.; Arnold, Sarah; Horne, Greg; Kinsley, Christopher W.; Freudenburg-Puricelli, Markey
发表日期	2024
ISSN	0094-8276
EISSN	1944-8007
起始页码	51
结束页码	8
卷号	51 期号:8
英文摘要	High-resolution records from past interglacial climates help constrain future responses to global warming, yet are rare. Here, we produce seasonally resolved climate records from subarctic-Canada using micron-scale measurements of oxygen isotopes (delta 18O) in speleothems with apparent annual growth bands from three interglacial periods-Marine Isotope Stages (MIS) 11, 9, and 5e. We find 3 parts per thousand lower delta 18O values during MIS 11 than MIS 5e, despite MIS 11 likely being warmer. We explore controls on high-latitude speleothem delta 18O and suggest low MIS 11 delta 18O values reflect greater contribution of cold-season precipitation to dripwater from longer annual ground thaw durations. Other potential influences include changes in precipitation source and/or increased fraction of cold-season precipitation from diminished sea ice in MIS 11. Our study highlights the potential for high-latitude speleothems to yield detailed isotopic records of Northern Hemisphere interglacial climates beyond the reach of Greenland ice cores and offers a framework for interpreting them. Few climate records pre-dating the last ice age exist from high-latitude North America, which inhibits our understanding of how regions with permafrost responded to past warming and how they might change in the future. Here, we help fill this data gap by using six speleothems (cave mineral deposits) from a cave in the Northwest Territories, Canada to produce climate records that span thousands of years during former warm periods of Earth's history. We find that speleothems that grew during an exceptionally warm super-interglacial period 400,000 years ago have 3 parts per thousand lower oxygen isotope (delta 18O) values compared to those that grew during a likely cooler interglacial 125,000 years ago. We explore potential explanations for the difference in delta 18O across interglacials, and suggest that lower delta 18O values during warmer periods reflect greater infiltration of cool-season precipitation with longer annual ground thaw durations. This study highlights the importance of high-latitude speleothems to provide detailed climate records beyond the range available from Greenland ice cores. Long high-latitude terrestrial climate records are rare in the Northern Hemisphere High-latitude speleothems can provide ultra-high-resolution climate records beyond the reach of Greenland ice cores Mean oxygen isotopes of Arctic and subarctic speleothems likely are controlled by annual ground thaw durations
英文关键词	paleoclimatology; subarctic; speleothems; interglacials; geochemistry; terrestrial
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:001200412900001
来源期刊	GEOPHYSICAL RESEARCH LETTERS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/305857
作者单位	Massachusetts Institute of Technology (MIT); Boston College; University of Melbourne; Berkeley Geochronolgy Center
推荐引用方式 GB/T 7714	Batchelor, Cameron J.,McGee, David,Shakun, Jeremy D.,et al. Insights Into Changing Interglacial Conditions in Subarctic Canada From MIS 11 Through MIS 5e From Seasonally Resolved Speleothem Records[J],2024,51(8).
APA	Batchelor, Cameron J..,McGee, David.,Shakun, Jeremy D..,Woodhead, Jon.,Jost, Adam B..,...&Freudenburg-Puricelli, Markey.(2024).Insights Into Changing Interglacial Conditions in Subarctic Canada From MIS 11 Through MIS 5e From Seasonally Resolved Speleothem Records.GEOPHYSICAL RESEARCH LETTERS,51(8).
MLA	Batchelor, Cameron J.,et al."Insights Into Changing Interglacial Conditions in Subarctic Canada From MIS 11 Through MIS 5e From Seasonally Resolved Speleothem Records".GEOPHYSICAL RESEARCH LETTERS 51.8(2024).