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Seasonal evolution of subglacial drainage and acceleration in a Greenland outlet glacier
Open accessAbstract
An acceleration of ice-mass loss has been observed near the margin of the Greenland ice sheet, partly as a result of faster ice motion. Observations by GPS receivers reveal high seasonal variability in ice motion, with summer motion up to 220% higher than winter background levels. The Greenland ice sheet contains enough water to raise sea levels by 7 m. However, its present mass balance and future contribution to sea level rise is poorly understood1. Accelerated mass loss has been observed near the ice sheet margin, partly as a result of faster ice motion2,3,4. Surface melt waters can reach the base of the ice sheet and enhance basal ice motion5,6. However, the response of ice motion to seasonal variations in meltwater supply is poorly constrained both in space and time. Here we present ice motion data obtained with global positioning system receivers located along a ∼35 km transect at the western margin of the Greenland ice sheet throughout a summer melt season. Our measurements reveal substantial increases in ice velocity during summer, up to 220% above winter background values. These speed-up events migrate up the glacier over the course of the summer. The relationship between melt and ice motion varies both at each site throughout the melt season and between sites. We suggest that these patterns can be explained by the seasonal evolution of the subglacial drainage system similar to hydraulic forcing mechanisms for ice dynamics that have been observed at smaller glaciers.
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Cited by
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Fahnestock, M., Scambos, T., Moon, T., Gardner, A., Haran, T., & Klinger, M. (2016) · Remote Sensing of Environment · doi:10.1016/j.rse.2015.11.023 · Cited by 359
Fjords as Aquatic Critical Zones (ACZs)
Bianchi, T. S., Arndt, S., Austin, W. E. N., Benn, D. I., Bertrand, S., Cui, X., Faust, J. C., Koziorowska-Makuch, K., Moy, C. M., Savage, C., et al. (2020) · Earth-Science Reviews · doi:10.1016/j.earscirev.2020.103145 · Cited by 269
Metadata
- Authors
- Bartholomew, I., Nienow, P., Mair, D., Hubbard, A., King, M. A., & Sole, A.
- Venue
- Nature Geoscience
- Published
- 2010-05-09
- Volume
- 3
- Issue
- 6
- Pages
- 408-411
- ISSN
- 1752-0894 (ISSN-L)
- 1752-0908
- OpenAlex
- W2056039982
- Cited by
- 393
- References
- 0
- FWCI
- 21.63
- Type
- journal article
- Language
- en
- Open access
- green
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- CoChat. (2026). Citation check: Seasonal evolution of subglacial drainage and acceleration in a Greenland outlet glacier. https://app.cochat.ai/papers/10.1038/ngeo863
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- Bartholomew, I., Nienow, P., Mair, D., Hubbard, A., King, M. A., & Sole, A. (2010). Seasonal evolution of subglacial drainage and acceleration in a Greenland outlet glacier. Nature Geoscience. https://doi.org/10.1038/ngeo863
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