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Competing climate feedbacks of ice sheet freshwater discharge in a warming world

Author

Listed:
  • Dawei Li

    (Shanghai Jiao Tong University
    Shanghai Jiao Tong University
    Polar Research Institute of China, Ministry of Natural Resources)

  • Robert M. DeConto

    (University of Massachusetts Amherst)

  • David Pollard

    (University of Massachusetts Amherst
    Pennsylvania State University)

  • Yongyun Hu

    (Peking University)

Abstract

Freshwater discharge from ice sheets induces surface atmospheric cooling and subsurface ocean warming, which are associated with negative and positive feedbacks respectively. However, uncertainties persist regarding these feedbacks’ relative strength and combined effect. Here we assess associated feedbacks in a coupled ice sheet-climate model, and show that for the Antarctic Ice Sheet the positive feedback dominates in moderate future warming scenarios and in the early stage of ice sheet retreat, but is overwhelmed by the negative feedback in intensive warming scenarios when the West Antarctic Ice Sheet undergoes catastrophic collapse. The Atlantic Meridional Overturning Circulation is affected by freshwater discharge from both the Greenland and the Antarctic ice sheets and, as an interhemispheric teleconnection bridge, exacerbates the opposing ice sheet’s retreat via the Bipolar Seesaw. These results highlight the crucial role of ice sheet-climate interactions via freshwater flux in future ice sheet retreat and associated sea-level rise.

Suggested Citation

  • Dawei Li & Robert M. DeConto & David Pollard & Yongyun Hu, 2024. "Competing climate feedbacks of ice sheet freshwater discharge in a warming world," Nature Communications, Nature, vol. 15(1), pages 1-12, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-49604-3
    DOI: 10.1038/s41467-024-49604-3
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    References listed on IDEAS

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