Marine-Calibrated Chronology of Southern Laurentide Ice Sheet Advance and Retreat: ∼2,000-Year Cycles Paced by Meltwater–Climate Feedback

Andrew D. Wickert; Carlie Williams; Lauren J. Gregoire; Kerry L Callaghan; Ruža F. Ivanović; Paul J. Valdes; Lael Vetter; Carrie E Jennings

doi:10.1029/2022GL100391

Marine-Calibrated Chronology of Southern Laurentide Ice Sheet Advance and Retreat: ∼2,000-Year Cycles Paced by Meltwater–Climate Feedback

Andrew D. Wickert, Carlie Williams, Lauren J. Gregoire, Kerry L Callaghan, Ruža F. Ivanović, Paul J. Valdes, Lael Vetter, Carrie E Jennings

Earth and Environmental Sciences-Twin Cities

Research output: Contribution to journal › Article › peer-review

Abstract

Climatic warming following the Last Glacial Maximum caused the southern Laurentide Ice Sheet (LIS) to begin ∼2,000-year cycles of retreat and readvance whose cause remains ambiguous. By developing a marine-calibrated chronology of southern LIS position, we counterintuitively demonstrate that between 17.6 and 11.3 ka, ice advanced during times of northern-hemisphere warming and retreated during times of northern-hemisphere cooling. Here we propose a cyclical feedback: Meltwater from ice retreat cooled the northern hemisphere by weakening the Atlantic Meridional Overturning Circulation (AMOC). This eventually lead to ice-sheet readvance, which reduced and rerouted meltwater discharge, and thereby allowed the AMOC to strengthen and the northern hemisphere to warm. Our data suggest that this antiphased ice–climate interaction, paced by ice-sheet response time, was initiated by synchronous warming and ice retreat ∼18.7–17.6 ka (corresponding to the Erie “Interstade”) and reached its apex during the Younger Dryas.

Original language	English (US)
Article number	e2022GL100391
Journal	Geophysical Research Letters
Volume	50
Issue number	10
DOIs	https://doi.org/10.1029/2022GL100391
State	Published - May 28 2023

Bibliographical note

Funding Information:
ADW was supported by the US Department of Defense through the National Defense Science & Engineering Graduate Fellowship Program, by the US National Science Foundation Graduate Research Fellowship under Grant DGE 1144083, by the McKnight Foundation through a McKnight Land‐Grant Professorship awarded through the University of Minnesota, and by a Humboldt‐Forschungsstipendium from the Alexander von Humboldt Foundation. Conversations with Andy Breckenridge helped to inform and shape this manuscript.

Publisher Copyright:
© 2023. The Authors.

Keywords

North America
deglaciation
ice sheet
ocean circulation
paleoclimate

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1029/2022GL100391

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Wickert, A. D., Williams, C., Gregoire, L. J., Callaghan, K. L., Ivanović, R. F., Valdes, P. J., Vetter, L., & Jennings, C. E. (2023). Marine-Calibrated Chronology of Southern Laurentide Ice Sheet Advance and Retreat: ∼2,000-Year Cycles Paced by Meltwater–Climate Feedback. Geophysical Research Letters, 50(10), Article e2022GL100391. https://doi.org/10.1029/2022GL100391

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title = "Marine-Calibrated Chronology of Southern Laurentide Ice Sheet Advance and Retreat: ∼2,000-Year Cycles Paced by Meltwater–Climate Feedback",

abstract = "Climatic warming following the Last Glacial Maximum caused the southern Laurentide Ice Sheet (LIS) to begin ∼2,000-year cycles of retreat and readvance whose cause remains ambiguous. By developing a marine-calibrated chronology of southern LIS position, we counterintuitively demonstrate that between 17.6 and 11.3 ka, ice advanced during times of northern-hemisphere warming and retreated during times of northern-hemisphere cooling. Here we propose a cyclical feedback: Meltwater from ice retreat cooled the northern hemisphere by weakening the Atlantic Meridional Overturning Circulation (AMOC). This eventually lead to ice-sheet readvance, which reduced and rerouted meltwater discharge, and thereby allowed the AMOC to strengthen and the northern hemisphere to warm. Our data suggest that this antiphased ice–climate interaction, paced by ice-sheet response time, was initiated by synchronous warming and ice retreat ∼18.7–17.6 ka (corresponding to the Erie “Interstade”) and reached its apex during the Younger Dryas.",

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author = "Wickert, {Andrew D.} and Carlie Williams and Gregoire, {Lauren J.} and Callaghan, {Kerry L} and Ivanovi{\'c}, {Ru{\v z}a F.} and Valdes, {Paul J.} and Lael Vetter and Jennings, {Carrie E}",

note = "Funding Information: ADW was supported by the US Department of Defense through the National Defense Science & Engineering Graduate Fellowship Program, by the US National Science Foundation Graduate Research Fellowship under Grant DGE 1144083, by the McKnight Foundation through a McKnight Land‐Grant Professorship awarded through the University of Minnesota, and by a Humboldt‐Forschungsstipendium from the Alexander von Humboldt Foundation. Conversations with Andy Breckenridge helped to inform and shape this manuscript. Publisher Copyright: {\textcopyright} 2023. The Authors.",

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month = may,

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doi = "10.1029/2022GL100391",

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T2 - ∼2,000-Year Cycles Paced by Meltwater–Climate Feedback

AU - Wickert, Andrew D.

AU - Williams, Carlie

AU - Gregoire, Lauren J.

AU - Callaghan, Kerry L

AU - Ivanović, Ruža F.

AU - Valdes, Paul J.

AU - Vetter, Lael

AU - Jennings, Carrie E

N1 - Funding Information: ADW was supported by the US Department of Defense through the National Defense Science & Engineering Graduate Fellowship Program, by the US National Science Foundation Graduate Research Fellowship under Grant DGE 1144083, by the McKnight Foundation through a McKnight Land‐Grant Professorship awarded through the University of Minnesota, and by a Humboldt‐Forschungsstipendium from the Alexander von Humboldt Foundation. Conversations with Andy Breckenridge helped to inform and shape this manuscript. Publisher Copyright: © 2023. The Authors.

PY - 2023/5/28

Y1 - 2023/5/28

N2 - Climatic warming following the Last Glacial Maximum caused the southern Laurentide Ice Sheet (LIS) to begin ∼2,000-year cycles of retreat and readvance whose cause remains ambiguous. By developing a marine-calibrated chronology of southern LIS position, we counterintuitively demonstrate that between 17.6 and 11.3 ka, ice advanced during times of northern-hemisphere warming and retreated during times of northern-hemisphere cooling. Here we propose a cyclical feedback: Meltwater from ice retreat cooled the northern hemisphere by weakening the Atlantic Meridional Overturning Circulation (AMOC). This eventually lead to ice-sheet readvance, which reduced and rerouted meltwater discharge, and thereby allowed the AMOC to strengthen and the northern hemisphere to warm. Our data suggest that this antiphased ice–climate interaction, paced by ice-sheet response time, was initiated by synchronous warming and ice retreat ∼18.7–17.6 ka (corresponding to the Erie “Interstade”) and reached its apex during the Younger Dryas.

AB - Climatic warming following the Last Glacial Maximum caused the southern Laurentide Ice Sheet (LIS) to begin ∼2,000-year cycles of retreat and readvance whose cause remains ambiguous. By developing a marine-calibrated chronology of southern LIS position, we counterintuitively demonstrate that between 17.6 and 11.3 ka, ice advanced during times of northern-hemisphere warming and retreated during times of northern-hemisphere cooling. Here we propose a cyclical feedback: Meltwater from ice retreat cooled the northern hemisphere by weakening the Atlantic Meridional Overturning Circulation (AMOC). This eventually lead to ice-sheet readvance, which reduced and rerouted meltwater discharge, and thereby allowed the AMOC to strengthen and the northern hemisphere to warm. Our data suggest that this antiphased ice–climate interaction, paced by ice-sheet response time, was initiated by synchronous warming and ice retreat ∼18.7–17.6 ka (corresponding to the Erie “Interstade”) and reached its apex during the Younger Dryas.

KW - North America

KW - deglaciation

KW - ice sheet

KW - ocean circulation

KW - paleoclimate

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JF - Geophysical Research Letters

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ER -

Marine-Calibrated Chronology of Southern Laurentide Ice Sheet Advance and Retreat: ∼2,000-Year Cycles Paced by Meltwater–Climate Feedback

Abstract

Bibliographical note

Keywords

UN SDGs

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