Ocean access to a cavity beneath Totten Glacier in East Antarctica

J.S. Greenbaum, D.D. Blankenship, D. Young, T.G. Richter, J.L. Roberts, Alan Aitken, B. Legrésy, D.M. Schroeder, R.C. Warner, T.D. Van Ommen, M.J. Siegert

    Research output: Contribution to journalArticle

    60 Citations (Scopus)

    Abstract

    Totten Glacier, the primary outlet of the Aurora Subglacial Basin, has the largest thinning rate in East Antarctica. Thinning may be driven by enhanced basal melting due to ocean processes, modulated by polynya activity. Warm modified Circumpolar Deep Water, which has been linked to glacier retreat in West Antarctica, has been observed in summer and winter on the nearby continental shelf beneath 400 to 500 m of cool Antarctic Surface Water. Here we derive the bathymetry of the sea floor in the region from gravity and magnetics data as well as ice-thickness measurements. We identify entrances to the ice-shelf cavity below depths of 400 to 500 m that could allow intrusions of warm water if the vertical structure of inflow is similar to nearby observations. Radar sounding reveals a previously unknown inland trough that connects the main ice-shelf cavity to the ocean. If thinning trends continue, a larger water body over the trough could potentially allow more warm water into the cavity, which may, eventually, lead to destabilization of the low-lying region between Totten Glacier and the similarly deep glacier flowing into the Reynolds Trough. We estimate that at least 3.5 m of eustatic sea level potential drains through Totten Glacier, so coastal processes in this area could have global consequences.
    Original languageEnglish
    Pages (from-to)294-298
    JournalNature Geoscience
    Volume8
    Issue number4
    DOIs
    Publication statusPublished - 2015

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    cavity
    glacier
    thinning
    trough
    ice shelf
    ocean
    warm water
    basal melting
    glacier retreat
    polynya
    ice thickness
    aurora
    bathymetry
    drain
    continental shelf
    inflow
    seafloor
    deep water
    radar
    sea level

    Cite this

    Greenbaum, J. S., Blankenship, D. D., Young, D., Richter, T. G., Roberts, J. L., Aitken, A., ... Siegert, M. J. (2015). Ocean access to a cavity beneath Totten Glacier in East Antarctica. Nature Geoscience, 8(4), 294-298. https://doi.org/10.1038/ngeo2388
    Greenbaum, J.S. ; Blankenship, D.D. ; Young, D. ; Richter, T.G. ; Roberts, J.L. ; Aitken, Alan ; Legrésy, B. ; Schroeder, D.M. ; Warner, R.C. ; Van Ommen, T.D. ; Siegert, M.J. / Ocean access to a cavity beneath Totten Glacier in East Antarctica. In: Nature Geoscience. 2015 ; Vol. 8, No. 4. pp. 294-298.
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    abstract = "Totten Glacier, the primary outlet of the Aurora Subglacial Basin, has the largest thinning rate in East Antarctica. Thinning may be driven by enhanced basal melting due to ocean processes, modulated by polynya activity. Warm modified Circumpolar Deep Water, which has been linked to glacier retreat in West Antarctica, has been observed in summer and winter on the nearby continental shelf beneath 400 to 500 m of cool Antarctic Surface Water. Here we derive the bathymetry of the sea floor in the region from gravity and magnetics data as well as ice-thickness measurements. We identify entrances to the ice-shelf cavity below depths of 400 to 500 m that could allow intrusions of warm water if the vertical structure of inflow is similar to nearby observations. Radar sounding reveals a previously unknown inland trough that connects the main ice-shelf cavity to the ocean. If thinning trends continue, a larger water body over the trough could potentially allow more warm water into the cavity, which may, eventually, lead to destabilization of the low-lying region between Totten Glacier and the similarly deep glacier flowing into the Reynolds Trough. We estimate that at least 3.5 m of eustatic sea level potential drains through Totten Glacier, so coastal processes in this area could have global consequences.",
    author = "J.S. Greenbaum and D.D. Blankenship and D. Young and T.G. Richter and J.L. Roberts and Alan Aitken and B. Legr{\'e}sy and D.M. Schroeder and R.C. Warner and {Van Ommen}, T.D. and M.J. Siegert",
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    Greenbaum, JS, Blankenship, DD, Young, D, Richter, TG, Roberts, JL, Aitken, A, Legrésy, B, Schroeder, DM, Warner, RC, Van Ommen, TD & Siegert, MJ 2015, 'Ocean access to a cavity beneath Totten Glacier in East Antarctica' Nature Geoscience, vol. 8, no. 4, pp. 294-298. https://doi.org/10.1038/ngeo2388

    Ocean access to a cavity beneath Totten Glacier in East Antarctica. / Greenbaum, J.S.; Blankenship, D.D.; Young, D.; Richter, T.G.; Roberts, J.L.; Aitken, Alan; Legrésy, B.; Schroeder, D.M.; Warner, R.C.; Van Ommen, T.D.; Siegert, M.J.

    In: Nature Geoscience, Vol. 8, No. 4, 2015, p. 294-298.

    Research output: Contribution to journalArticle

    TY - JOUR

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    AU - Greenbaum, J.S.

    AU - Blankenship, D.D.

    AU - Young, D.

    AU - Richter, T.G.

    AU - Roberts, J.L.

    AU - Aitken, Alan

    AU - Legrésy, B.

    AU - Schroeder, D.M.

    AU - Warner, R.C.

    AU - Van Ommen, T.D.

    AU - Siegert, M.J.

    PY - 2015

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    N2 - Totten Glacier, the primary outlet of the Aurora Subglacial Basin, has the largest thinning rate in East Antarctica. Thinning may be driven by enhanced basal melting due to ocean processes, modulated by polynya activity. Warm modified Circumpolar Deep Water, which has been linked to glacier retreat in West Antarctica, has been observed in summer and winter on the nearby continental shelf beneath 400 to 500 m of cool Antarctic Surface Water. Here we derive the bathymetry of the sea floor in the region from gravity and magnetics data as well as ice-thickness measurements. We identify entrances to the ice-shelf cavity below depths of 400 to 500 m that could allow intrusions of warm water if the vertical structure of inflow is similar to nearby observations. Radar sounding reveals a previously unknown inland trough that connects the main ice-shelf cavity to the ocean. If thinning trends continue, a larger water body over the trough could potentially allow more warm water into the cavity, which may, eventually, lead to destabilization of the low-lying region between Totten Glacier and the similarly deep glacier flowing into the Reynolds Trough. We estimate that at least 3.5 m of eustatic sea level potential drains through Totten Glacier, so coastal processes in this area could have global consequences.

    AB - Totten Glacier, the primary outlet of the Aurora Subglacial Basin, has the largest thinning rate in East Antarctica. Thinning may be driven by enhanced basal melting due to ocean processes, modulated by polynya activity. Warm modified Circumpolar Deep Water, which has been linked to glacier retreat in West Antarctica, has been observed in summer and winter on the nearby continental shelf beneath 400 to 500 m of cool Antarctic Surface Water. Here we derive the bathymetry of the sea floor in the region from gravity and magnetics data as well as ice-thickness measurements. We identify entrances to the ice-shelf cavity below depths of 400 to 500 m that could allow intrusions of warm water if the vertical structure of inflow is similar to nearby observations. Radar sounding reveals a previously unknown inland trough that connects the main ice-shelf cavity to the ocean. If thinning trends continue, a larger water body over the trough could potentially allow more warm water into the cavity, which may, eventually, lead to destabilization of the low-lying region between Totten Glacier and the similarly deep glacier flowing into the Reynolds Trough. We estimate that at least 3.5 m of eustatic sea level potential drains through Totten Glacier, so coastal processes in this area could have global consequences.

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    DO - 10.1038/ngeo2388

    M3 - Article

    VL - 8

    SP - 294

    EP - 298

    JO - Nature Geoscience

    JF - Nature Geoscience

    SN - 1752-0894

    IS - 4

    ER -

    Greenbaum JS, Blankenship DD, Young D, Richter TG, Roberts JL, Aitken A et al. Ocean access to a cavity beneath Totten Glacier in East Antarctica. Nature Geoscience. 2015;8(4):294-298. https://doi.org/10.1038/ngeo2388