World Bulletin / News Desk
A big expansion of Antarctica's ice almost a million years ago may help scientists predict modern climate change, a study showed.
The report, examining the Earth's orbit around the sun in a 100,000-year cycle of cold and warmth, showed that ice sheets took thousands of years to grow at the start of Ice Ages and surprisingly lagged a quicker cooling of the oceans.
That delay, and the discovery of a large buildup of ice into the Southern Ocean around Antarctica 900,000 years ago, is a step towards understanding the climate system and its link to changes in the planet's orbit, they said.
That in turn could help predict current global warming.
"When we think of future climate change we think about everything happening together," said Harry Elderfield, a professor at Cambridge University and lead author of the study in Friday's edition of the journal Science.
"We might think that it's warmer so sea level would change at the same time" as ice melts on the land and adds to the oceans. "What we are seeing is that things are changing, not really in concert."
"The deep sea cooled to nearly freezing temperatures early in any given glacial cycle, whereas globalice volume typically increased gradually," Peter Clark of Oregon State University wrote in a separate commentary in Science on the findings.
Elderfield's team found records of both sea temperatures and ice volumes by studying the chemical makeup of tiny marine fossils in the seabed off New Zealand.
The last Ice Age was at a maximum about 20,000 years ago and the Earth is into a natural warmer period in a cycle expected to last about 100,000 years.
But manmade global warming is now the main cause of a rise in temperatures in the past half-century, according to the U.N. panel of climate scientists which projects ever more floods, droughts and rising sea levels.
Until now, most experts have believed that Ice Ages were seen mainly in changes in the volume of icearound the North Pole -- giant ice sheets blanketed much of the Northern Hemisphere at the height of the last Ice Age.
"The assumption had been that the big cycles in the Ice Ages occurred with ice volume in the Arctic. We are finding that is not the case. We are finding that Antarctica is changing," Elderfield said.
And the growth of Antarctic ice 900,000 years ago apparently initiated a previously unexplained shift in the cycle of Ice Ages and warmer periods to the current 100,000 years from 41,000 years, they said. Both periods are linked to Earth's orbit.
Scientists previously have been unable to separate information in fossils about the volume of ice on the planet from information about changing temperatures, Elderfield said.
They found that the amount of magnesium indicated changes in temperatures in the fossils and the exact makeup of oxygen indicated the amount of ice.
The business side of the new operating system was debuted Tuesday. In the spring, Microsoft will reveal consumer capabilities.
Atlas will give marketers access to Facebook's user data that they can use for specific ad campaigns.
The European Aviation Safety Agency allowed European airlines to permit the use of electronic devices throughout the whole flight
Water found in Earth's oceans, in meteorites and frozen in lunar craters predates the birth of the solar system, a study shows
The mission makes India the first country in Asia to reach Mars, after an attempt by regional rival China failed to leave earth's orbit in 2011.
Turkish-made electric car traveled 2,500 kilometers (about 1553 miles) to six cities and cost only 37.5 Turkish liras (about $17) since September 15.
Web users will face criminal action for spreading "false" information aimed at discrediting the government, the official KPL news agency said.
"All are welcome, regardless of religion, nationality or occupation, to contact our organization -- Mossad -- to work for us or to be involved in activities which could bring great personal benefit," reads the new "Contact us" section of the Mossad website
MAVEN will study how the solar wind strips away atoms and molecules in the planet's upper atmosphere, a process that scientists believe has been underway for eons.
Chief prosecutor Gholam-Hossein Mohseni-Ejei accused Communications Minister Mahmoud Vaezi of failing to unplug social networking sites and apps "with immoral and criminal content."
Promising 500km on just four hours' charge, the 'T-1', designed and produced by staff and pupils at Istanbul University arrives in eastern city of Erzurum during nationwide tour.
Blind people say the KNFB Reader app will enable a new level of engagement in everyday life, from reading menus in restaurants to browsing handouts in the classroom.
A successful Mars mission would boost the global standing of India's state-run space agency.
The Senate Armed Services Committee's year-long probe found the military's U.S. Transportation Command, or Transcom, was aware of only two out of at least 20 such cyber intrusions within a single year.
The new study revealed the role of hunter-gatherers from the Siberian region who the scientists called "ancient north Eurasians."
The iPad is expected to have a 9.7 inch screen, while the new version of the iPad mini will have a 7.9 inch screen, Bloomberg earlier reported