Añadido: Apr 24, 2008
Duración: 0:29
During the summer melt season, melt water accumulates in undulations on the surface of the Greenland ice sheet. Eventually, these melt lakes drain through crevasses or moulins (tunnels under the ice sheet surface), delivering water to the bottom of the ice sheet. This melt water lubricates the interface between the ice and the bedrock, causing the ice to flow faster toward the sea during summer. As summer melt increases and more melt water is available, the greater its effect on summer ice sheet flow rates. Due to global warming this process has been speeding up. This animation is narrated by Waleed Abdalati, head of the Cryospheric Sciences Branch at NASA's Goddard Space Flight Center. For more on climate change check out Discovery's 3D globe at http://dsc.discovery.com/guides/discovery-earth-live/discovery-earth-live.html
Categoría: Tech
Tags: change channel climate discovery earth environment global live warming
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