Arctic sea ice shrinks to lowest ever level on Sept. 16Sep 20, 1:32 pm
Washington, September 20 (ANI): Arctic sea ice melted to its lowest level on record on Sept. 16, the National Snow and Ice Data Center (NSIDC) has reported.Analysis of satellite data by NASA and the NASA-supported NSIDC at the University of Colorado in Boulder showed that the sea ice extent shrunk to 1.32 million square miles (3.41 million square kilometers).The new record minimum measures almost 300,000 square miles less than the previous lowest extent in the satellite record, set in mid-September 2007, of 1.61 million square miles (4.17 million square kilometers). For comparison, the state of Texas measures around 268,600 square miles.NSIDC cautioned that, although Sept. 16 seems to be the annual minimum, there's still time for winds to change and compact the ice floes, potentially reducing the sea ice extent further. NASA and NSIDC will release a complete analysis of the 2012 melt season next month, once all data for September are available.Arctic sea ice cover naturally grows during the dark Arctic winters and retreats when the sun re-appears in the spring. But the sea ice minimum summertime extent, which is normally reached in September, has been decreasing over the last three decades as Arctic ocean and air temperatures have increased. This year's minimum extent is approximately half the size of the average extent from 1979 to 2000. This year's minimum extent also marks the first time Arctic sea ice has dipped below 4 million square kilometers."Climate models have predicted a retreat of the Arctic sea ice; but the actual retreat has proven to be much more rapid than the predictions. There continues to be considerable inter-annual variability in the sea ice cover, but the long-term retreat is quite apparent," said Claire Parkinson, a climate scientist at NASA Goddard Space Flight Center, Greenbelt, Md. The thickness of the ice cover is also in decline."The core of the ice cap is the perennial ice, which normally survived the summer because it was so thick", said Joey Comiso, senior scientist with NASA Goddard. "But because it's been thinning year after year, it has now become vulnerable to melt".The disappearing older ice gets replaced in winter with thinner seasonal ice that usually melts completely in the summer.This year, a powerful cyclone formed off the coast of Alaska and moved on Aug. 5 to the center of the Arctic Ocean, where it churned the weakened ice cover for several days. The storm cut off a large section of sea ice north of the Chukchi Sea and pushed it south to warmer waters that made it melt entirely. It also broke vast extensions of ice into smaller pieces more likely to melt."The storm definitely seems to have played a role in this year's unusually large retreat of the ice", Parkinson said. "But that exact same storm, had it occurred decades ago when the ice was thicker and more extensive, likely wouldn't have had as prominent an impact, because the ice wasn't as vulnerable then as it is now," he stated. NASA scientists derive 2012 sea ice concentration data from microwave instruments aboard Defense Meteorological Satellite Program satellites. The wind data in the visualization is from the National Centers for Environmental Prediction. (ANI)
Scientists have new theory on how 'climate' affects 'violence' Jun 25, 8:37 am
Washington D.C, Jun 25 (ANI): Scientists have long struggled to explain why cool heads won't be able to prevail in a hotter world and now, a team of researchers has come up with a model that could help explain why.Full Story »
Dinosaur-era bugs knew how to camouflage Jun 25, 8:00 am
Washington D.C, Jun 25 (ANI): It turns out, insects have been perfecting the art of disguise for a hundred million years.Full Story »
Earth's present magnetic field isn't 'same old, same old' Jun 25, 8:00 am
Washington D.C, Jun 25 (ANI): Turns out, Earth's ancient magnetic field was significantly different than the present day field, originating from several poles rather than the familiar two.Full Story »
Global warming forecast: Even warmer days ahead Jun 24, 12:29 pm
Washington D.C, Jun 24 (ANI): According to a warning from the past, the future global warming may get too hot to handle.Full Story »
- Soon, waste water may power Kerala homes
- Your win lies in the `eyes` of opponent
- 'Coral zombies' may eat away world's reefs
- How night vision was developed in early mammals?
- Why water is considered as basic unit of life?
- Families spending time outside together function better: Study
- Genetic history of Himalayan populations found
- This algorithm can help predict next terror attack
- Mongoose moms risk own survival to protect unborn kids
- 'Dino-killer' asteroid 'wiped out nearly all mammals'
TOP VIDEO STORIES