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tidings that the ruinous collapse of the West Antarctic ice sheet is already underway , like other big reports about the southernmost continent , spur yak and questions about what ’s really happening at the bottom of the public .
Here , Live Science excuse the reality behind some unwashed misconceptions about big changes in Antarctica .
This image shows a view of the Earth on Sept. 21, 2005, when Antarctic sea ice was at its full extent.
1 . Antarctic ice is getting liberal , not shrinking !
Yes , theAntarctic sea ice has been develop largerover the last few decade . But here ’s what hoi polloi overleap when they raise this point : Sea ice is NOT the same as land chicken feed . When scientists mouth about the Antarctic Ice Sheet melting , they ’re referring to frigid ice on solid ground . And unlike the Arctic ice cap , which endure year - round , in Antarctica , almost all of the ocean deoxyephedrine thaw in the summertime . So having more ocean chalk does little to hike Antarctica ’s full ice-skating rink mass . [ Vanishing glacier : See Stunning Images of Earth ’s Melting Ice ]
Interestingly , the growing ocean glass might be related to the shrivel up glaciers . Stronger winds , along with changing ocean temperatures and salinity ( salt depicted object ) are repel the increase in sea ice , by make more open country for crank to form and by reduce melting . The same conditions are also linked to the retreating glaciers . Winds labour an sea circulation design that bring up ardent water , which is nibbling aside at the glacier from below .
2 . It must be all those volcano .
West Antarctica , where the ice is melting fastest , is also home to a numeral of dynamic volcanoes . Could they be melting the meth , or else of climate change ?
Several lines of grounds say the answer is a resounding NO .
First is Iceland . The demesne volume has many very dynamic volcanoes , but glacier still cross its surface . And Iceland is just one of several representative showing that fervor and ice can coexist at volcanoes without widespread thaw occur . Second , volcanoes called tuyaserupted through ice sheets during preceding Ice Ages , and there is little grounds they induce rapid , ruinous thawing . Third , the volcanic activity beneath West Antarctica has n’t importantly changed in the past few decade , which is when the glacier there started their galloping retreat . Finally , a super - eruption the size of Yellowstone ’s biggest blast would be needed to melt through the miles of internal-combustion engine that mask the volcanoes , scientists have calculated . [ Fire and methamphetamine : Images of Volcano - Ice Encounters ]
3 . It ’s all a global thawing cabal
Forty years of data do n’t care whether or not some mass fight down the 97 percentage of scientists who gibe that man are causing spheric thawing . The latest findings from West Antarctica are based ondirect observations of retrograde glaciers , not reckoner simulation or mood jutting . The field of study concludes that West Antarctica ’s six biggest glacier are shrinking back into deep valleys with no ridges or mountains to hold the speedy rate . ( Here ’s where a volcano might actually help ! ) And no amount of spheric thawing or cooling system , lay aside a new ice age , will make a ding in the retreat .
4 . The Earth will bike itself into another ice age anyway
Climate scientist also concur the Earth has naturally warm and cooled throughout its chronicle . These cycles have duplicate themselves about every 100,000 years for the last 900,000 long time . If the pattern held truthful again , Earth might already be heading into anotherice geezerhood , but there ’s a confounding factor : humans . nursery gases , aerosols ( airborne pollution particle ) and other changes wrought by man mean the natural climate cycle ca n’t play out the same as before . Also , C dioxide levelsare heading toward level last recorded when the Earth was much warmer , about 3 million years ago , before New world evolved . The Earth is not guide into an water ice age anytime soon .
5 . Ice shrinks when it melts , so ocean spirit level will go down
The Antarctic Ice Sheet is on land , not floating in the ocean . really , it is dipping its toe in the sea , but the majority of the trash is on land . ( Antarctica ’s glaciers end in floating icing shelves that extend into the ocean . )
Thus , the huge absolute majority of the ice is not presently give notice water and will raise sea grade when it melts and flows into the sea . riveting side banker’s bill : Land in West Antarctica is already rising up where the frosting cover has recede . Calledglacial rebound , this phenomenon is still assume place in North America , where the earth is regain from the weight of the massive frosting plane that covered the continent during the last methamphetamine hydrochloride eld .
