Self-regulation of ice flow varies across the ablation area in south-west Greenland
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Published:2015-04-01
Issue:2
Volume:9
Page:603-611
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ISSN:1994-0424
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Container-title:The Cryosphere
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language:en
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Short-container-title:The Cryosphere
Author:
van de Wal R. S. W., Smeets C. J. P. P., Boot W., Stoffelen M., van Kampen R., Doyle S. H., Wilhelms F., van den Broeke M. R.ORCID, Reijmer C. H., Oerlemans J.ORCID, Hubbard A.
Abstract
Abstract. The concept of a positive feedback between ice flow and enhanced melt rates in a warmer climate fuelled the debate regarding the temporal and spatial controls on seasonal ice acceleration. Here we combine melt, basal water pressure and ice velocity data. Using 20 years of data covering the whole ablation area, we show that there is not a strong positive correlation between annual ice velocities and melt rates. Annual velocities even slightly decreased with increasing melt. Results also indicate that melt variations are most important for velocity variations in the upper ablation zone up to the equilibrium line altitude. During the extreme melt in 2012, a large velocity response near the equilibrium line was observed, highlighting the possibility of meltwater to have an impact even high on the ice sheet. This may lead to an increase of the annual ice velocity in the region above S9 and requires further monitoring.
Publisher
Copernicus GmbH
Subject
Earth-Surface Processes,Water Science and Technology
Reference49 articles.
1. Andreas, E. L.: A theory for scalar roughness and the scalar coefficients over snow and ice, Bound.-Lay. Meteorol., 38, 159–184, 1987. 2. Bartholomaus, T. C., Anderson, R. S., and Anderson, S. P.: Response of glacier basal motion to transient water storage, Nat. Geosci., 1, 33–37, 2008. 3. Bartholomew, I., Nienow, P., Mair, D., Hubbard, A., King, M. A., and Sole, A.: Seasonal evolution of subglacial drainage and acceleration in a Greenland outlet glacier, Nat. Geosci., 3, 408–411, 2010. 4. Bartholomew, I., Nienow, P., Sole, A., Mair, D., Cowton, T., King, M. A., and Palmer, S.: Seasonal variations in Greenland Ice Sheet motion: Inland extent and behaviour at higher elevations, Earth Planet. Sci. Lett. 307, 271–278, 2011. 5. Bartholomew, I., Nienow, P., Sole, a., Mair, D., Cowton, T., King, M. A.: Short-term variability in Greenland Ice Sheet motion forced by time-varying meltwater drainage: implications for the relationship between subglacial drainage system behaviour and ice velocity, J. Geophys. Res., 117, F03002, https://doi.org/10.1029/2011JF002220, 2012.
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