Meltwater Pond Are Causing Antarctic Ice Shelves To Buckle Under The Weight

Meltwater Lakes Are Causing Antarctic Ice Shelves To Buckle Under The Weight

Meltwater Pond Are Causing Antarctic Ice Shelves To Buckle Under The Weight

A new route has been identified for global warming to strip the Earth of its remaining ice. Meltwater lakes on ice shelves cause the ice nearby to twist under the water’s weight, hastening the shelves’ collapse.

Computer models have suggested that when it gets warm enough for water to pond on ice shelves, such as those around Antarctica, the weight- up to 2 million tons- will depress the ice beneath. Refreezing come winter makes no difference, but if an opening drains the lake, the sudden weight loss should raise the shelf beneath. Like any other solid object, repeated flexing could make fissures, which may contribute to the shelf breaking up.

These ideas are all theoretical, however, and we’ve detected recently our understanding of the behavior of large quantities of ice is often not all that good. Dr Alison Banwell of Cambridge University attached pressure sensors to the McMurdo ice shelf to see how it is really behaving.

“Scientists ought to have predicting and modeling this process for some time, but nobody has ever collected field data that depicted it happening until now, ” Banwell said in a statement.

Meltwater Pond Are Causing Antarctic Ice Shelves To Buckle Under The Weight
The research is highly dependent on installing sensors in locations both close to and far from large pools. Alison Banwell

In Nature Communications, Banwell reports that after controlling for those motions induced by the tides, sensors situated near 2-meter-deep( 7 foot) depressions shifted as ponds formed and drained. More distant sensors remained stable.

The results confirm Banwell’s modeling, and while good news for the authors, this is bad for humanity. Banwell’s models indicate bending in parts of the shelf, while nearby regions were unmoved, could have caused the 2002 broken off of 3,250 square kilometers( 1,250 square miles) of the Larsen B Ice Shelf.

Antarctic expeditions described water pooling on ice shelves more than a century ago, but warmer temperatures are seeing it happen more often, entailing other shelves could soon follow Larsen B.

Ice shelves sit over water, rather than on land like ice sheets. Their loss doesn’t immediately affect sea level rise, since most of their volume is already displacing water.

Unfortunately, the disappearance of ice shelves does have two indirect, but very great, effects on ocean height. For one thing, ice shelves reflect most sunlight back into space, while the dark water that replaces them captures this energy, accelerating the rate of global warming. Furthermore, ice shelves often act as plugs, blocking glaciers’ flow to the sea. As a result, they slow down the rate at which Antarctic ice is lost, and their removal could accelerate that process. With three-quarters of Antarctica bordered by ice shelves, their survival is essential to keeping the rate of land ice melt, and therefore sea level rise, to something we can manage.

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Meltwater Pond Are Causing Antarctic Ice Shelves To Buckle Under The Weight
Meltwater Pond Are Causing Antarctic Ice Shelves To Buckle Under The Weight
Meltwater Pond Are Causing Antarctic Ice Shelves To Buckle Under The Weight
Meltwater Pond Are Causing Antarctic Ice Shelves To Buckle Under The Weight
Meltwater Pond Are Causing Antarctic Ice Shelves To Buckle Under The Weight

Meltwater Pond Are Causing Antarctic Ice Shelves To Buckle Under The Weight

Meltwater Pond Are Causing Antarctic Ice Shelves To Buckle Under The Weight

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