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Helheim Glacier ice velocity variability responds to runoff and terminus position change at different timescales

Author

Listed:
  • Lizz Ultee

    (Middlebury College
    Georgia Institute of Technology
    Massachusetts Institute of Technology)

  • Denis Felikson

    (Cryospheric Sciences Laboratory, NASA Goddard Space Flight Center
    Morgan State University)

  • Brent Minchew

    (Massachusetts Institute of Technology)

  • Leigh A. Stearns

    (University of Kansas)

  • Bryan Riel

    (Massachusetts Institute of Technology
    Zhejiang University)

Abstract

The Greenland Ice Sheet discharges ice to the ocean through hundreds of outlet glaciers. Recent acceleration of Greenland outlet glaciers has been linked to both oceanic and atmospheric drivers. Here, we leverage temporally dense observations, regional climate model output, and newly developed time series analysis tools to assess the most important forcings causing ice flow variability at one of the largest Greenland outlet glaciers, Helheim Glacier, from 2009 to 2017. We find that ice speed correlates most strongly with catchment-integrated runoff at seasonal to interannual scales, while multi-annual flow variability correlates most strongly with multi-annual terminus variability. The disparate time scales and the influence of subglacial topography on Helheim Glacier’s dynamics highlight different regimes that can inform modeling and forecasting of its future. Notably, our results suggest that the recent terminus history observed at Helheim is a response to, rather than the cause of, upstream changes.

Suggested Citation

  • Lizz Ultee & Denis Felikson & Brent Minchew & Leigh A. Stearns & Bryan Riel, 2022. "Helheim Glacier ice velocity variability responds to runoff and terminus position change at different timescales," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-33292-y
    DOI: 10.1038/s41467-022-33292-y
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    References listed on IDEAS

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    1. Adrian Luckman & Douglas I. Benn & Finlo Cottier & Suzanne Bevan & Frank Nilsen & Mark Inall, 2015. "Calving rates at tidewater glaciers vary strongly with ocean temperature," Nature Communications, Nature, vol. 6(1), pages 1-7, December.
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    Cited by:

    1. Camilla S. Andresen & Nanna B. Karlsson & Fiammetta Straneo & Sabine Schmidt & Thorbjørn J. Andersen & Emily F. Eidam & Anders A. Bjørk & Nicolas Dartiguemalle & Laurence M. Dyke & Flor Vermassen & Id, 2024. "Sediment discharge from Greenland’s marine-terminating glaciers is linked with surface melt," Nature Communications, Nature, vol. 15(1), pages 1-10, December.

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