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The Cryosphere An interactive open-access journal of the European Geosciences Union
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Volume 4, issue 3
The Cryosphere, 4, 261–268, 2010
https://doi.org/10.5194/tc-4-261-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.
The Cryosphere, 4, 261–268, 2010
https://doi.org/10.5194/tc-4-261-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 23 Jul 2010

Research article | 23 Jul 2010

An explanation for the dark region in the western melt zone of the Greenland ice sheet

I. G. M. Wientjes and J. Oerlemans I. G. M. Wientjes and J. Oerlemans
  • Institute for Marine and Atmospheric Research (IMAU), Utrecht University, Utrecht, The Netherlands

Abstract. The western part of the Greenland ice sheet contains a region that is darker than the surrounding ice. This feature has been analysed with the help of MODIS images. The dark region appears every year during the summer season and can always be found at the same location, which makes meltwater unlikely as the only source for the low albedos. Spectral information indicates that the ice in this region contains more debris than the ice closer to the margin. ASTER images reveal a wavy pattern in the darker ice. Based on these findings we conclude that ice, containing dust from older periods, is presently outcropping near the margin, leading to albedos lower than observed for the remaining ablation area. Therefore it can be concluded that the accumulation of meltwater is a result rather than a cause of the darkening.

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