Antarctic ice melting from warm water below: Study
Washington: Antarctica`s massive ice shelves are shrinking because they are being eaten away from below by warm water, a new study finds. That suggests that future sea levels could rise faster than many scientists have been predicting.
The western chunk of Antarctica is losing 23 feet of its floating ice sheet each year. Until now, scientists weren`t exactly sure how it was happening and whether or how man-made global warming might be a factor. The answer, according to a study published Wednesday in the journal Nature, is that climate change plays an indirect role — but one that has larger repercussions than if Antarctic ice were merely melting from warmer air.
Hamish Pritchard, a glaciologist at the British Antarctic Survey, said research using an ice-gazing NASA satellite showed that warmer air alone couldn`t explain what was happening to Antarctica. A more detailed examination found a chain of events that explained the shrinking ice shelves.
Twenty ice shelves showed signs that they were melting from warm water below. Changes in wind currents pushed that relatively warmer water closer to and beneath the floating ice shelves. The wind change is likely caused by a combination of factors, including natural weather variation, the ozone hole and man-made greenhouse gases, Pritchard said in a phone interview.
As the floating ice shelves melt and thin, that in turn triggers snow and ice on land glaciers to slide down to the floating shelves and eventually into the sea, causing sea level rise, Pritchard said. Thicker floating ice shelves usually keep much of the land snow and ice from shedding to sea, but that`s not happening now.
That whole process causes larger and faster sea level rise than simply warmer air melting snow on land-locked glaciers, Pritchard said.
"It means the ice sheets are highly sensitive to relatively subtle changes in climate through the effects of the wind," he said.
What`s happening in Antarctica "may have already triggered a period of unstable glacier retreat," the study concludes. If the entire Western Antarctic Ice Sheet were to melt — something that would take many decades if not centuries — scientists have estimated it would lift global sea levels by about 16 feet.
NASA chief scientist Waleed Abdalati, an expert in Earth`s ice systems who wasn`t involved in the research, said Pritchard`s study "makes an important advance" and provides key information about how Antarctica will contribute to global sea level rise.
Another outside expert, Ted Scambos of the National Snow and Ice Data Center, said the paper will change the way scientists think about melt in Antarctica. Seeing more warm water encircling the continent, he worries that with "a further push from the wind" newer areas could start shrinking.
More from India
More from World
More from Sports
More from Entertaiment
- Panel discussion on Mumbai HC allowing women to enter Haji Ali Dargah
- Panel discussion on Mumbai HC allowing women to enter Haji Ali Dargah Part II
- Uttarakhand: MBBS students builds toilets in a village in Rishikesh
- Digital detox helps to get rid of smartphones addiction
- Watch: Syrian boys crying, hugging each other after their brother is killed in airstrike
- Food allergies linked to higher asthma risk in kids
- Nepal PM Prachanda expands Cabinet, includes 13 ministers from NC
- Lifestyle changes to prevent diabetes can also cut cancer risk: Experts
- Odisha shocker: No ambulance, staff break bones of woman's dead body to carry it on a sling
- Insult to Prophet Mohammad: Dispose off case against Hindu Mahasabha leader in 4 weeks, SC tells Allahabad HC