Insights Into Changing Interglacial Conditions in Subarctic Canada From MIS 11 Through MIS 5e From Seasonally Resolved Speleothem Records
Name
Geophysical Research Letters - 2024 - Batchelor - Insights Into Changing Interglacial Conditions in Subarctic Canada From.pdf
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Published version
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1.71 MB
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Author(s)
Batchelor, Cameron J
McGee, David
Shakun, Jeremy D
Woodhead, Jon
Jost, Adam B
Arnold, Sarah
Horne, Greg
Kinsley, Christopher W
Freudenburg‐Puricelli, Markey
Date Issued
April 11, 2024
Journal
Geophysical Research Letters
Publisher
American Geophysical Union
Citation
atchelor, C. J., McGee, D., Shakun, J. D., Woodhead, J., Jost, A. B., Arnold, S., et al. (2024). Insights into changing interglacial conditions in subarctic Canada from MIS 11 through MIS 5e from seasonally resolved speleothem records. Geophysical Research Letters, 51, e2024GL108459.
Version
Final published version
Abstract
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 (δ18O) in speleothems with apparent annual growth bands from
three interglacial periods—Marine Isotope Stages (MIS) 11, 9, and 5e. We find 3‰ lower δ18O values during
MIS 11 than MIS 5e, despite MIS 11 likely being warmer. We explore controls on high‐latitude speleothem
δ18O and suggest low MIS 11 δ18O 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.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
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DOI of Published Version
10.1029/2024gl108459
