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Ocean variability beneath Thwaites Eastern Ice Shelf driven by the Pine Island Bay Gyre strength

Author

Listed:
  • Tiago S. Dotto

    (University of East Anglia)

  • Karen J. Heywood

    (University of East Anglia)

  • Rob A. Hall

    (University of East Anglia)

  • Ted A. Scambos

    (University of Colorado Boulder)

  • Yixi Zheng

    (University of East Anglia)

  • Yoshihiro Nakayama

    (Hokkaido University)

  • Shuntaro Hyogo

    (Hokkaido University)

  • Tasha Snow

    (Colorado School of Mines)

  • Anna K. Wåhlin

    (University of Gothenburg)

  • Christian Wild

    (Oregon State University)

  • Martin Truffer

    (University of Alaska Fairbanks)

  • Atsuhiro Muto

    (Temple University)

  • Karen E. Alley

    (University of Manitoba)

  • Lars Boehme

    (University of St Andrews)

  • Guilherme A. Bortolotto

    (University of St Andrews)

  • Scott W. Tyler

    (University of Nevada)

  • Erin Pettit

    (Oregon State University)

Abstract

West Antarctic ice-shelf thinning is primarily caused by ocean-driven basal melting. Here we assess ocean variability below Thwaites Eastern Ice Shelf (TEIS) and reveal the importance of local ocean circulation and sea-ice. Measurements obtained from two sub-ice-shelf moorings, spanning January 2020 to March 2021, show warming of the ice-shelf cavity and an increase in meltwater fraction of the upper sub-ice layer. Combined with ocean modelling results, our observations suggest that meltwater from Pine Island Ice Shelf feeds into the TEIS cavity, adding to horizontal heat transport there. We propose that a weakening of the Pine Island Bay gyre caused by prolonged sea-ice cover from April 2020 to March 2021 allowed meltwater-enriched waters to enter the TEIS cavity, which increased the temperature of the upper layer. Our study highlights the sensitivity of ocean circulation beneath ice shelves to local atmosphere-sea-ice-ocean forcing in neighbouring open oceans.

Suggested Citation

  • Tiago S. Dotto & Karen J. Heywood & Rob A. Hall & Ted A. Scambos & Yixi Zheng & Yoshihiro Nakayama & Shuntaro Hyogo & Tasha Snow & Anna K. Wåhlin & Christian Wild & Martin Truffer & Atsuhiro Muto & Ka, 2022. "Ocean variability beneath Thwaites Eastern Ice Shelf driven by the Pine Island Bay Gyre strength," Nature Communications, Nature, vol. 13(1), pages 1-13, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-35499-5
    DOI: 10.1038/s41467-022-35499-5
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    References listed on IDEAS

    as
    1. Yoshihiro Nakayama & Dimitris Menemenlis & Hong Zhang & Michael Schodlok & Eric Rignot, 2018. "Origin of Circumpolar Deep Water intruding onto the Amundsen and Bellingshausen Sea continental shelves," Nature Communications, Nature, vol. 9(1), pages 1-9, December.
    2. Robert M. DeConto & David Pollard, 2016. "Contribution of Antarctica to past and future sea-level rise," Nature, Nature, vol. 531(7596), pages 591-597, March.
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    Cited by:

    1. Chen Cheng & Adrian Jenkins & Paul R. Holland & Zhaomin Wang & Jihai Dong & Chengyan Liu, 2024. "Ice shelf basal channel shape determines channelized ice-ocean interactions," Nature Communications, Nature, vol. 15(1), pages 1-14, December.
    2. Taewook Park & Yoshihiro Nakayama & SungHyun Nam, 2024. "Amundsen Sea circulation controls bottom upwelling and Antarctic Pine Island and Thwaites ice shelf melting," Nature Communications, Nature, vol. 15(1), pages 1-9, December.

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