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d. Yet that estimate largely didn't take into account melting from west Antarctica, because few studies for that area had been completed, Anandakrishnan said. The rate at which the area's ice is melting has increased 77percentsince 1973, and the reasons are several, researchers said. The ice sheet there, unlike that in much of east Antarctica, is attached to a bed below sea level. Nike Flyknit Running Shoes Price

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That means ocean currents can deliver Nike Flyknit Chukka White Black warm water at glaciers' base, or grounding lines places where the ice attaches to the bed, NASA said. The heat makes the grounding line retreat inland, leaving a less massive ice shelf above. When ice shelves lose mass, they can't hold back inland glaciers from flowing toward the sea.

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thinning is conducive to more grounding line retreat, NASA said. "The system (becomes) a chain reaction that is unstoppable, (with) every process of retreat feeding the next one," Rignot said. A hill or a mountain behind the grounding line would slow this retreat. But the beds behind nearly all the Amundsen Sea glaciers slope downward, researchers said. Rignot said he believes global warming and a depletion of the Earth's ozone layer is partly to blame, saying they have changed the winds in the area, causing more warm water to be invected toward the glaciers. The findings don't clash with news that Antarctic sea ice recently hit record levels, Rignot and Anandakrishnan said.

be uncommon, but not necessarily unprecedented, Anandakrishnan said. Evidence shows that west Antarctica retained an ice sheet during the last few 100,000 year cycles of glacial formation and retreat, he said. But evidence also suggests the entire west Antarctica ice sheet might have melted 500,000 to 600,000 years ago, Anandakrishnan .

Nike Flyknit Chukka White Black

Nike Flyknit Chukka White Black

They said sea ice forms and melts quickly, while glaciers are subject to longer term changes. And the same winds that stir subsurface heat toward the base of Antarctic ice shelf also can expand sea ice cover, Rignot said. Such a melting would Nike Flyknit Racer Multicolor Footlocker

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Glaciers then flow faster and become thin as a result, and this Nike Flyknit Air Max White Pink

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