Younger Dryas cooling and the Greenland climate response to CO2

Zhengyu Liu, Anders E. Carlson, Feng He, Esther C. Brady, Bette L. Otto-Bliesner, Bruce P. Briegleb, Mark Wehrenberg, Peter U Clark, Shu Wu, Jun Cheng, Jiaxu Zhang, David Noone, Jiang Zhu

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    Abstract

    Greenland ice-core δ18O-temperature reconstructions suggest a dramatic cooling during the Younger Dryas (YD; 12.9–11.7 ka), with temperatures being as cold as the earlier Oldest Dryas (OD; 18.0–14.6 ka) despite an approximately 50 ppm rise in atmospheric CO2. Such YD cooling implies a muted Greenland climate response to atmospheric CO2, contrary to physical predictions of an enhanced high-latitude response to future increases in CO2. Here we show that North Atlantic sea surface temperature reconstructions as well as transient climate model simulations suggest that the YD over Greenland should be substantially warmer than the OD by approximately 5 °C in response to increased atmospheric CO2. Additional experiments with an isotope-enabled model suggest that the apparent YD temperature reconstruction derived from the ice-core δ18O record is likely an artifact of an altered temperature-δ18O relationship due to changing deglacial atmospheric circulation. Our results thus suggest that Greenland climate was warmer during the YD relative to the OD in response to rising atmospheric CO2, consistent with sea surface temperature reconstructions and physical predictions, and has a sensitivity approximately twice that found in climate models for current climate due to an enhanced albedo feedback during the last deglaciation.
    LanguageEnglish
    Pages11101-11104
    JournalPROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
    Volume109
    Issue number28
    DOIs
    Publication statusPublished - Jul 2012

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    Younger Dryas
    cooling
    climate
    ice core
    climate modeling
    sea surface temperature
    temperature
    last deglaciation
    prediction
    atmospheric circulation
    albedo
    artifact
    isotope
    simulation
    experiment

    Cite this

    Liu, Z., Carlson, A. E., He, F., Brady, E. C., Otto-Bliesner, B. L., Briegleb, B. P., ... Zhu, J. (2012). Younger Dryas cooling and the Greenland climate response to CO2. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 109(28), 11101-11104. https://doi.org/10.1073/pnas.1202183109
    Liu, Zhengyu ; Carlson, Anders E. ; He, Feng ; Brady, Esther C. ; Otto-Bliesner, Bette L. ; Briegleb, Bruce P. ; Wehrenberg, Mark ; Clark, Peter U ; Wu, Shu ; Cheng, Jun ; Zhang, Jiaxu ; Noone, David ; Zhu, Jiang. / Younger Dryas cooling and the Greenland climate response to CO2. In: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA. 2012 ; Vol. 109, No. 28. pp. 11101-11104.
    @article{abe59197ad214bd4bbc0ba08b6c64ded,
    title = "Younger Dryas cooling and the Greenland climate response to CO2",
    abstract = "Greenland ice-core δ18O-temperature reconstructions suggest a dramatic cooling during the Younger Dryas (YD; 12.9–11.7 ka), with temperatures being as cold as the earlier Oldest Dryas (OD; 18.0–14.6 ka) despite an approximately 50 ppm rise in atmospheric CO2. Such YD cooling implies a muted Greenland climate response to atmospheric CO2, contrary to physical predictions of an enhanced high-latitude response to future increases in CO2. Here we show that North Atlantic sea surface temperature reconstructions as well as transient climate model simulations suggest that the YD over Greenland should be substantially warmer than the OD by approximately 5 °C in response to increased atmospheric CO2. Additional experiments with an isotope-enabled model suggest that the apparent YD temperature reconstruction derived from the ice-core δ18O record is likely an artifact of an altered temperature-δ18O relationship due to changing deglacial atmospheric circulation. Our results thus suggest that Greenland climate was warmer during the YD relative to the OD in response to rising atmospheric CO2, consistent with sea surface temperature reconstructions and physical predictions, and has a sensitivity approximately twice that found in climate models for current climate due to an enhanced albedo feedback during the last deglaciation.",
    author = "Zhengyu Liu and Carlson, {Anders E.} and Feng He and Brady, {Esther C.} and Otto-Bliesner, {Bette L.} and Briegleb, {Bruce P.} and Mark Wehrenberg and Clark, {Peter U} and Shu Wu and Jun Cheng and Jiaxu Zhang and David Noone and Jiang Zhu",
    year = "2012",
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    doi = "10.1073/pnas.1202183109",
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    Liu, Z, Carlson, AE, He, F, Brady, EC, Otto-Bliesner, BL, Briegleb, BP, Wehrenberg, M, Clark, PU, Wu, S, Cheng, J, Zhang, J, Noone, D & Zhu, J 2012, 'Younger Dryas cooling and the Greenland climate response to CO2', PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, vol. 109, no. 28, pp. 11101-11104. https://doi.org/10.1073/pnas.1202183109

    Younger Dryas cooling and the Greenland climate response to CO2. / Liu, Zhengyu; Carlson, Anders E.; He, Feng; Brady, Esther C.; Otto-Bliesner, Bette L.; Briegleb, Bruce P.; Wehrenberg, Mark; Clark, Peter U; Wu, Shu; Cheng, Jun; Zhang, Jiaxu; Noone, David; Zhu, Jiang.

    In: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, Vol. 109, No. 28, 07.2012, p. 11101-11104.

    Research output: Contribution to journalArticle

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    T1 - Younger Dryas cooling and the Greenland climate response to CO2

    AU - Liu, Zhengyu

    AU - Carlson, Anders E.

    AU - He, Feng

    AU - Brady, Esther C.

    AU - Otto-Bliesner, Bette L.

    AU - Briegleb, Bruce P.

    AU - Wehrenberg, Mark

    AU - Clark, Peter U

    AU - Wu, Shu

    AU - Cheng, Jun

    AU - Zhang, Jiaxu

    AU - Noone, David

    AU - Zhu, Jiang

    PY - 2012/7

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    N2 - Greenland ice-core δ18O-temperature reconstructions suggest a dramatic cooling during the Younger Dryas (YD; 12.9–11.7 ka), with temperatures being as cold as the earlier Oldest Dryas (OD; 18.0–14.6 ka) despite an approximately 50 ppm rise in atmospheric CO2. Such YD cooling implies a muted Greenland climate response to atmospheric CO2, contrary to physical predictions of an enhanced high-latitude response to future increases in CO2. Here we show that North Atlantic sea surface temperature reconstructions as well as transient climate model simulations suggest that the YD over Greenland should be substantially warmer than the OD by approximately 5 °C in response to increased atmospheric CO2. Additional experiments with an isotope-enabled model suggest that the apparent YD temperature reconstruction derived from the ice-core δ18O record is likely an artifact of an altered temperature-δ18O relationship due to changing deglacial atmospheric circulation. Our results thus suggest that Greenland climate was warmer during the YD relative to the OD in response to rising atmospheric CO2, consistent with sea surface temperature reconstructions and physical predictions, and has a sensitivity approximately twice that found in climate models for current climate due to an enhanced albedo feedback during the last deglaciation.

    AB - Greenland ice-core δ18O-temperature reconstructions suggest a dramatic cooling during the Younger Dryas (YD; 12.9–11.7 ka), with temperatures being as cold as the earlier Oldest Dryas (OD; 18.0–14.6 ka) despite an approximately 50 ppm rise in atmospheric CO2. Such YD cooling implies a muted Greenland climate response to atmospheric CO2, contrary to physical predictions of an enhanced high-latitude response to future increases in CO2. Here we show that North Atlantic sea surface temperature reconstructions as well as transient climate model simulations suggest that the YD over Greenland should be substantially warmer than the OD by approximately 5 °C in response to increased atmospheric CO2. Additional experiments with an isotope-enabled model suggest that the apparent YD temperature reconstruction derived from the ice-core δ18O record is likely an artifact of an altered temperature-δ18O relationship due to changing deglacial atmospheric circulation. Our results thus suggest that Greenland climate was warmer during the YD relative to the OD in response to rising atmospheric CO2, consistent with sea surface temperature reconstructions and physical predictions, and has a sensitivity approximately twice that found in climate models for current climate due to an enhanced albedo feedback during the last deglaciation.

    U2 - 10.1073/pnas.1202183109

    DO - 10.1073/pnas.1202183109

    M3 - Article

    VL - 109

    SP - 11101

    EP - 11104

    JO - Proceedings of the National Academy of Sciences

    T2 - Proceedings of the National Academy of Sciences

    JF - Proceedings of the National Academy of Sciences

    SN - 0027-8424

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    ER -