Dating melting

The figure shows the five-year (2004 through 2008) trend in winter sea ice volume (black curve on the graph) in the Arctic.On the maps, Greenland and North America are at the bottom and left with northern Asia at the top.

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The first year ice freezes during the winter and melts the following summer. Ice and snow reflect a good deal of the solar radiation that falls on them.But liquid water is an excellent absorber of the sun’s radiant energy, so replacing ice with liquid water decreases albedo., and her boyfriend, musician Josh Dun, are the cutest couple ever.He might look tough, but don't let his tattoos and blue mohawk fool you — he's probably the sweetest boyfriend in the entire world and we have proof!The figure below shows that multiyear ice, which provides summer hunting habitat for polar bears, is decreasing.

With the ice goes the bears’ lifestyle, which is in danger as a consequence of a warming world.The poster child for the decreasing Arctic sea ice is the polar bear, a lineage that apparently evolved from its brown bear ancestors about 150,000 years ago during a .Adapted to life in the Arctic, polar bears are often found on floating sea ice where they feast on seals that surface to breathe or others unwary enough to rest on the same floe.This layer of less dense water could act somewhat like a dam preventing the , the vast thermocline-driven deep ocean current, from flowing far enough north in the Atlantic to cool and sink.This could slow or even stop the flow and disrupt the transfer of energy and nutrients around the globe.High in the Peruvian Andes, the Quelccaya ice cap and its associated glaciers, like Qori Kalis pictured here, supply water for a large population at lower altitudes.