Milankovitch-paced Termination II in a Nevada speleothem?

Jeremy D. Shakun, Stephen J. Burns, Peter U Clark, Hai Cheng, R. Lawrence Edwards

    Research output: Contribution to journalArticle

    22 Citations (Scopus)

    Abstract

    The Devils Hole (DH) calcite record from the Great Basin, Nevada, provided the first radiometrically dated time series of late-Pleistocene climate fluctuations,. In doing so, DH suggested that the penultimate deglaciation, Termination II (T-II), occurred at 142 ± 3 ka, which is ∼10 kyr before the associated rise in summer insolation, helping to launch the “causality problem” for Milankovitch. The interpretation of the DH record has been subject to considerable discussion ever since. We present the first attempt to reproduce the DH record of an early T-II in the Great Basin based on a stalagmite from Lehman Caves, Nevada, which is ∼400 km northeast of Devils Hole. Our speleothem records at least the latter part of T-II over its period of growth from ∼133–129 ka, which appears to disagree with the early timing of T-II in DH. DH also exhibits important differences from many other paleoclimate records over the past two deglaciations, though these are reduced somewhat after ice-volume correcting DH δ18O. We suggest that the climatic signal in the DH record remains to be fully explained.
    LanguageEnglish
    PagesL18701
    JournalGeophysical Research Letters
    Volume38
    DOIs
    Publication statusPublished - Sep 2011

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    speleothem
    deglaciation
    stalagmite
    insolation
    paleoclimate
    basin
    cave
    calcite
    Pleistocene
    time series
    ice
    climate
    summer

    Cite this

    Shakun, Jeremy D. ; Burns, Stephen J. ; Clark, Peter U ; Cheng, Hai ; Edwards, R. Lawrence. / Milankovitch-paced Termination II in a Nevada speleothem?. In: Geophysical Research Letters. 2011 ; Vol. 38. pp. L18701.
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    title = "Milankovitch-paced Termination II in a Nevada speleothem?",
    abstract = "The Devils Hole (DH) calcite record from the Great Basin, Nevada, provided the first radiometrically dated time series of late-Pleistocene climate fluctuations,. In doing so, DH suggested that the penultimate deglaciation, Termination II (T-II), occurred at 142 ± 3 ka, which is ∼10 kyr before the associated rise in summer insolation, helping to launch the “causality problem” for Milankovitch. The interpretation of the DH record has been subject to considerable discussion ever since. We present the first attempt to reproduce the DH record of an early T-II in the Great Basin based on a stalagmite from Lehman Caves, Nevada, which is ∼400 km northeast of Devils Hole. Our speleothem records at least the latter part of T-II over its period of growth from ∼133–129 ka, which appears to disagree with the early timing of T-II in DH. DH also exhibits important differences from many other paleoclimate records over the past two deglaciations, though these are reduced somewhat after ice-volume correcting DH δ18O. We suggest that the climatic signal in the DH record remains to be fully explained.",
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    Milankovitch-paced Termination II in a Nevada speleothem? / Shakun, Jeremy D.; Burns, Stephen J.; Clark, Peter U; Cheng, Hai; Edwards, R. Lawrence.

    In: Geophysical Research Letters, Vol. 38, 09.2011, p. L18701.

    Research output: Contribution to journalArticle

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