Antarctic ice sheet discharge driven by atmosphere-ocean feedbacks at the Last Glacial Termination

C. J. Fogwill, C. S M Turney, N. R. Golledge, D. M. Etheridge, M. Rubino, D. P. Thornton, A. Baker, J. Woodward, K. Winter, T. D. Van Ommen, A. D. Moy, M. A J Curran, S. M. Davies, M. E. Weber, M. I. Bird, N. C. Munksgaard, L. Menviel, C. M. Rootes, B. Ellis, H. Millman & 3 others J. Vohra, A. Rivera, A. Cooper

    Research output: Contribution to journalArticleResearchpeer-review

    5 Downloads (Pure)

    Abstract

    Reconstructing the dynamic response of the Antarctic ice sheets to warming during the Last Glacial Termination (LGT; 18,000-11,650 yrs ago) allows us to disentangle ice-climate feedbacks that are key to improving future projections. Whilst the sequence of events during this period is reasonably well-known, relatively poor chronological control has precluded precise alignment of ice, atmospheric and marine records, making it difficult to assess relationships between Antarctic ice-sheet (AIS) dynamics, climate change and sea level. Here we present results from a highly-resolved 'horizontal ice core' from the Weddell Sea Embayment, which records millennial-scale AIS dynamics across this extensive region. Counterintuitively, we find AIS mass-loss across the full duration of the Antarctic Cold Reversal (ACR; 14,600-12,700 yrs ago), with stabilisation during the subsequent millennia of atmospheric warming. Earth-system and ice-sheet modelling suggests these contrasting trends were likely Antarctic-wide, sustained by feedbacks amplified by the delivery of Circumpolar Deep Water onto the continental shelf. Given the anti-phase relationship between inter-hemispheric climate trends across the LGT our findings demonstrate that Southern Ocean-AIS feedbacks were controlled by global atmospheric teleconnections. With increasing stratification of the Southern Ocean and intensification of mid-latitude westerly winds today, such teleconnections could amplify AIS mass loss and accelerate global sea-level rise.

    Original languageEnglish
    Article number39979
    Pages (from-to)1-10
    Number of pages10
    JournalScientific Reports
    Volume7
    DOIs
    Publication statusPublished - 5 Jan 2017

    Fingerprint

    Ice Cover
    Atmosphere
    Oceans and Seas
    Ice
    Climate
    Climate Change
    Water

    Cite this

    Fogwill, C. J., Turney, C. S. M., Golledge, N. R., Etheridge, D. M., Rubino, M., Thornton, D. P., ... Cooper, A. (2017). Antarctic ice sheet discharge driven by atmosphere-ocean feedbacks at the Last Glacial Termination. Scientific Reports, 7, 1-10. [39979]. https://doi.org/10.1038/srep39979
    Fogwill, C. J. ; Turney, C. S M ; Golledge, N. R. ; Etheridge, D. M. ; Rubino, M. ; Thornton, D. P. ; Baker, A. ; Woodward, J. ; Winter, K. ; Van Ommen, T. D. ; Moy, A. D. ; Curran, M. A J ; Davies, S. M. ; Weber, M. E. ; Bird, M. I. ; Munksgaard, N. C. ; Menviel, L. ; Rootes, C. M. ; Ellis, B. ; Millman, H. ; Vohra, J. ; Rivera, A. ; Cooper, A. / Antarctic ice sheet discharge driven by atmosphere-ocean feedbacks at the Last Glacial Termination. In: Scientific Reports. 2017 ; Vol. 7. pp. 1-10.
    @article{9728a78cc3ca4e2a8b8b9ececb1cd470,
    title = "Antarctic ice sheet discharge driven by atmosphere-ocean feedbacks at the Last Glacial Termination",
    abstract = "Reconstructing the dynamic response of the Antarctic ice sheets to warming during the Last Glacial Termination (LGT; 18,000-11,650 yrs ago) allows us to disentangle ice-climate feedbacks that are key to improving future projections. Whilst the sequence of events during this period is reasonably well-known, relatively poor chronological control has precluded precise alignment of ice, atmospheric and marine records, making it difficult to assess relationships between Antarctic ice-sheet (AIS) dynamics, climate change and sea level. Here we present results from a highly-resolved 'horizontal ice core' from the Weddell Sea Embayment, which records millennial-scale AIS dynamics across this extensive region. Counterintuitively, we find AIS mass-loss across the full duration of the Antarctic Cold Reversal (ACR; 14,600-12,700 yrs ago), with stabilisation during the subsequent millennia of atmospheric warming. Earth-system and ice-sheet modelling suggests these contrasting trends were likely Antarctic-wide, sustained by feedbacks amplified by the delivery of Circumpolar Deep Water onto the continental shelf. Given the anti-phase relationship between inter-hemispheric climate trends across the LGT our findings demonstrate that Southern Ocean-AIS feedbacks were controlled by global atmospheric teleconnections. With increasing stratification of the Southern Ocean and intensification of mid-latitude westerly winds today, such teleconnections could amplify AIS mass loss and accelerate global sea-level rise.",
    author = "Fogwill, {C. J.} and Turney, {C. S M} and Golledge, {N. R.} and Etheridge, {D. M.} and M. Rubino and Thornton, {D. P.} and A. Baker and J. Woodward and K. Winter and {Van Ommen}, {T. D.} and Moy, {A. D.} and Curran, {M. A J} and Davies, {S. M.} and Weber, {M. E.} and Bird, {M. I.} and Munksgaard, {N. C.} and L. Menviel and Rootes, {C. M.} and B. Ellis and H. Millman and J. Vohra and A. Rivera and A. Cooper",
    year = "2017",
    month = "1",
    day = "5",
    doi = "10.1038/srep39979",
    language = "English",
    volume = "7",
    pages = "1--10",
    journal = "Scientific Reports",
    issn = "2045-2322",
    publisher = "Nature Publishing Group",

    }

    Fogwill, CJ, Turney, CSM, Golledge, NR, Etheridge, DM, Rubino, M, Thornton, DP, Baker, A, Woodward, J, Winter, K, Van Ommen, TD, Moy, AD, Curran, MAJ, Davies, SM, Weber, ME, Bird, MI, Munksgaard, NC, Menviel, L, Rootes, CM, Ellis, B, Millman, H, Vohra, J, Rivera, A & Cooper, A 2017, 'Antarctic ice sheet discharge driven by atmosphere-ocean feedbacks at the Last Glacial Termination', Scientific Reports, vol. 7, 39979, pp. 1-10. https://doi.org/10.1038/srep39979

    Antarctic ice sheet discharge driven by atmosphere-ocean feedbacks at the Last Glacial Termination. / Fogwill, C. J.; Turney, C. S M; Golledge, N. R.; Etheridge, D. M.; Rubino, M.; Thornton, D. P.; Baker, A.; Woodward, J.; Winter, K.; Van Ommen, T. D.; Moy, A. D.; Curran, M. A J; Davies, S. M.; Weber, M. E.; Bird, M. I.; Munksgaard, N. C.; Menviel, L.; Rootes, C. M.; Ellis, B.; Millman, H.; Vohra, J.; Rivera, A.; Cooper, A.

    In: Scientific Reports, Vol. 7, 39979, 05.01.2017, p. 1-10.

    Research output: Contribution to journalArticleResearchpeer-review

    TY - JOUR

    T1 - Antarctic ice sheet discharge driven by atmosphere-ocean feedbacks at the Last Glacial Termination

    AU - Fogwill, C. J.

    AU - Turney, C. S M

    AU - Golledge, N. R.

    AU - Etheridge, D. M.

    AU - Rubino, M.

    AU - Thornton, D. P.

    AU - Baker, A.

    AU - Woodward, J.

    AU - Winter, K.

    AU - Van Ommen, T. D.

    AU - Moy, A. D.

    AU - Curran, M. A J

    AU - Davies, S. M.

    AU - Weber, M. E.

    AU - Bird, M. I.

    AU - Munksgaard, N. C.

    AU - Menviel, L.

    AU - Rootes, C. M.

    AU - Ellis, B.

    AU - Millman, H.

    AU - Vohra, J.

    AU - Rivera, A.

    AU - Cooper, A.

    PY - 2017/1/5

    Y1 - 2017/1/5

    N2 - Reconstructing the dynamic response of the Antarctic ice sheets to warming during the Last Glacial Termination (LGT; 18,000-11,650 yrs ago) allows us to disentangle ice-climate feedbacks that are key to improving future projections. Whilst the sequence of events during this period is reasonably well-known, relatively poor chronological control has precluded precise alignment of ice, atmospheric and marine records, making it difficult to assess relationships between Antarctic ice-sheet (AIS) dynamics, climate change and sea level. Here we present results from a highly-resolved 'horizontal ice core' from the Weddell Sea Embayment, which records millennial-scale AIS dynamics across this extensive region. Counterintuitively, we find AIS mass-loss across the full duration of the Antarctic Cold Reversal (ACR; 14,600-12,700 yrs ago), with stabilisation during the subsequent millennia of atmospheric warming. Earth-system and ice-sheet modelling suggests these contrasting trends were likely Antarctic-wide, sustained by feedbacks amplified by the delivery of Circumpolar Deep Water onto the continental shelf. Given the anti-phase relationship between inter-hemispheric climate trends across the LGT our findings demonstrate that Southern Ocean-AIS feedbacks were controlled by global atmospheric teleconnections. With increasing stratification of the Southern Ocean and intensification of mid-latitude westerly winds today, such teleconnections could amplify AIS mass loss and accelerate global sea-level rise.

    AB - Reconstructing the dynamic response of the Antarctic ice sheets to warming during the Last Glacial Termination (LGT; 18,000-11,650 yrs ago) allows us to disentangle ice-climate feedbacks that are key to improving future projections. Whilst the sequence of events during this period is reasonably well-known, relatively poor chronological control has precluded precise alignment of ice, atmospheric and marine records, making it difficult to assess relationships between Antarctic ice-sheet (AIS) dynamics, climate change and sea level. Here we present results from a highly-resolved 'horizontal ice core' from the Weddell Sea Embayment, which records millennial-scale AIS dynamics across this extensive region. Counterintuitively, we find AIS mass-loss across the full duration of the Antarctic Cold Reversal (ACR; 14,600-12,700 yrs ago), with stabilisation during the subsequent millennia of atmospheric warming. Earth-system and ice-sheet modelling suggests these contrasting trends were likely Antarctic-wide, sustained by feedbacks amplified by the delivery of Circumpolar Deep Water onto the continental shelf. Given the anti-phase relationship between inter-hemispheric climate trends across the LGT our findings demonstrate that Southern Ocean-AIS feedbacks were controlled by global atmospheric teleconnections. With increasing stratification of the Southern Ocean and intensification of mid-latitude westerly winds today, such teleconnections could amplify AIS mass loss and accelerate global sea-level rise.

    UR - http://www.scopus.com/inward/record.url?scp=85008626284&partnerID=8YFLogxK

    U2 - 10.1038/srep39979

    DO - 10.1038/srep39979

    M3 - Article

    VL - 7

    SP - 1

    EP - 10

    JO - Scientific Reports

    JF - Scientific Reports

    SN - 2045-2322

    M1 - 39979

    ER -

    Fogwill CJ, Turney CSM, Golledge NR, Etheridge DM, Rubino M, Thornton DP et al. Antarctic ice sheet discharge driven by atmosphere-ocean feedbacks at the Last Glacial Termination. Scientific Reports. 2017 Jan 5;7:1-10. 39979. https://doi.org/10.1038/srep39979