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| Titel |
Regional and temporal variations in the formation of supraglacial melt ponds on the Greenland Ice Sheet |
| VerfasserIn |
N. Selmes, T. Murray, T. D. James |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250027388
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| Zusammenfassung |
| Surface melt ponds form seasonally in the ablation zone of the Greenland Ice Sheet and they
have been shown to provide the sites for the hydrofracture initiation of the moulins required
for supraglacial meltwater to reach the bed of the Greenland Ice Sheet (Das et al., 2008).
Studies to date have been restricted to a region of large surface lakes surrounding the
Jakobshavn Isbrae catchment area (Box and Ski, 2007). However, large surface lakes also
develop seasonally in other areas of the ice sheet, especially in the northern regions. We have
developed a high temporal resolution dataset of lake evolution and drainage in all of the
regions of the Greenland Ice Sheet where large surface lakes develop during summer. This
study spans the period 2001-2008 using approximately 200 MODIS scenes per melt
season per region. We show that there are significant regional differences in the
supraglacial hydrology of the ice sheet, which could cause spatial variations in the
role of melt water in ice dynamics across Greenland as it responds to the warming
climate.
Das, S., Joughin, M., Behn, M., Howat, I., King, M., Lizarralde, D., Bhatia, M., 2008.
Fracture propagation to the base of the Greenland Ice Sheet during supra-glacial lake
drainage, Science, 5877, p.778-781.
Box, J., and Ski, K., 2007. Remote sounding of Greenland supraglacial melt lakes:
implications for subglacial hydraulics. J. Glaciol., 53(181), p. 257-265. |
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