Committee on Challenges and Opportunities in the Hydrologic Sciences, National Research Council. "2 The Water Cycle: An Agent of Change." Challenges and Opportunities in the Hydrologic Sciences. Washington, DC: The National Academies Press, 2012.
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Challenges and Opportunities in the Hydrologic Sciences
FIGURE 2-9 Flowing meltwater on the surface of the Greenland ice sheet. Some of this water goes into the ice sheet through features called moulins, eventually reaching the bottom, where it may promote more rapid flow of the ice. Meltwater and moulins have been occurring at higher and higher elevations over time. SOURCE: Reprinted, with permission, from Roger Braithwaite, University of Manchester and Specialiststock.com.