Helheim Glacier ice velocity variability responds to runoff and terminus position change at different timescales
<jats:title>Abstract</jats:title><jats:p>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 observation...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Springer Science and Business Media LLC
2023
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| Online Access: | https://hdl.handle.net/1721.1/148131 |
| _version_ | 1826203780342874112 |
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| author | Ultee, Lizz Felikson, Denis Minchew, Brent Stearns, Leigh A Riel, Bryan |
| author2 | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences |
| author_facet | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Ultee, Lizz Felikson, Denis Minchew, Brent Stearns, Leigh A Riel, Bryan |
| author_sort | Ultee, Lizz |
| collection | MIT |
| description | <jats:title>Abstract</jats:title><jats:p>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.</jats:p> |
| first_indexed | 2024-09-23T12:42:55Z |
| format | Article |
| id | mit-1721.1/148131 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T12:42:55Z |
| publishDate | 2023 |
| publisher | Springer Science and Business Media LLC |
| record_format | dspace |
| spelling | mit-1721.1/1481312023-02-22T03:25:55Z Helheim Glacier ice velocity variability responds to runoff and terminus position change at different timescales Ultee, Lizz Felikson, Denis Minchew, Brent Stearns, Leigh A Riel, Bryan Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences <jats:title>Abstract</jats:title><jats:p>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.</jats:p> 2023-02-21T18:34:18Z 2023-02-21T18:34:18Z 2022 2023-02-21T18:25:22Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/148131 Ultee, Lizz, Felikson, Denis, Minchew, Brent, Stearns, Leigh A and Riel, Bryan. 2022. "Helheim Glacier ice velocity variability responds to runoff and terminus position change at different timescales." Nature Communications, 13 (1). en 10.1038/S41467-022-33292-Y Nature Communications Creative Commons Attribution 4.0 International license https://creativecommons.org/licenses/by/4.0/ application/pdf Springer Science and Business Media LLC Nature |
| spellingShingle | Ultee, Lizz Felikson, Denis Minchew, Brent Stearns, Leigh A Riel, Bryan Helheim Glacier ice velocity variability responds to runoff and terminus position change at different timescales |
| title | Helheim Glacier ice velocity variability responds to runoff and terminus position change at different timescales |
| title_full | Helheim Glacier ice velocity variability responds to runoff and terminus position change at different timescales |
| title_fullStr | Helheim Glacier ice velocity variability responds to runoff and terminus position change at different timescales |
| title_full_unstemmed | Helheim Glacier ice velocity variability responds to runoff and terminus position change at different timescales |
| title_short | Helheim Glacier ice velocity variability responds to runoff and terminus position change at different timescales |
| title_sort | helheim glacier ice velocity variability responds to runoff and terminus position change at different timescales |
| url | https://hdl.handle.net/1721.1/148131 |
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