New Zealand - Saturday, May 18, 2013 23:43 - 0 Comments
The Briefing issue 2
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Download PDF version here: BriefingIssue19May13
New Zealand - Monday, May 20, 2013 14:47 - 3 Comments
Antarctic ice melting scare cancelled – climate science study
For decades, scientists have used ancient shorelines to predict the stability of today’s largest ice sheets in Greenland and Antarctica. Markings of a high shoreline from three million years ago, for example – when Earth was going through a warm period – were thought to be evidence of a high sea level due to ice sheet collapse at that time. This assumption has led many scientists to think that if the world’s largest ice sheets collapsed in the past, then they may do just the same in our modern, progressively warming world.
However, a new groundbreaking study now challenges this thinking.
Using the east coast of the United States as their laboratory, a research team led by David Rowley, CIFAR Senior Fellow and professor at the University of Chicago, has found that the Earth’s hot mantle pushed up segments of ancient shorelines over millions of years, making them appear higher now than they originally were millions of years ago.
“Our findings suggest that the previous connections scientists made between ancient shoreline height and ice volumes are erroneous and that perhaps our ice sheets were more stable in the past than we originally thought,” says Rowley. “Our study is telling scientists that they can no longer ignore the effect of Earth’s interior dynamics when predicting historic sea levels and ice volumes.”
The study, published online in Science on May 16, was a collaboration that included CIFAR Senior Fellows Alessandro Forte (Université du Québec à Montréal) and Jerry Mitrovica (Harvard), and a former CIFAR-supported post-doctoral fellow Rob Moucha (Syracuse).
“This study was the culmination of years of work and deep collaboration by researchers in CIFAR’s program in Earth System Evolution,” explains Rowley. “For this study, each of us brought our individual expertise to the table: Rob and Alex worked on simulations of Earth’s mantle dynamics, Jerry provided calculations on how glaciers warp Earth’s surface, and I shaped our understanding of the geology of the landscape we were looking at. This study would not have been possible without CIFAR.”
The team studied the coast from Virginia to Florida, which has an ancient scarp tens of metres above present-day sea level. Until now, many research groups have studied this shoreline and concluded that during a warm period three million years ago, the Greenland, West Antarctic and a fraction of East Antarctic ice sheets collapsed, raising the sea level at least 35 metres. But the new findings by Rowley and his team suggest that these ice sheets, particularly the East Antarctic Ice Sheet (the world’s largest), were probably more stable.
To do their study, the team used computer simulations to follow the movement of mantle and tectonic plates that occurred over time. Their prediction of how the ancient shoreline would have developed over millions of years matched what geologists mapping this ancient coast have observed. The next steps for the team are to try to make accurate predictions in other locations around the world.
“The paper is important because it shows that no prediction of ancient ice volumes can ever again ignore the Earth’s interior dynamics,” explains Rowley. “It also provides a novel bridge between two disciplines in Earth science that rarely intersect: mantle dynamics and long-term climate. It is the kind of study that changes how people think about our past climate and what our future holds.”
Source: http://www.cifar.ca/ancient-shorelines-ice-sheets-stability
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THE BESTSELLING BOOK SALE
Entertainment, New Zealand - Mar 19, 2012 10:45 - 0 Comments
Steve’s Big Picture – Kim Kardashian and Kim Jong-un
The Two Kims
Caption: Seems the rumored East Meets West romance between reality TV superstar Kim (I’m Not An Idiot) Kardashian and newly minted North Korean Supreme Leader Kim Jong-un may be a go. The couple was spotted arm in arm at a recent dedication in Pyongyang. When asked if his intentions with Ms. Kardashian were honorable, Kim J made it clear that the two K’s have more in common than first names – first and foremost they have a great passion for Gilligan’s Island reruns.
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World - Apr 23, 2013 9:27 - 0 Comments
Mounties bust Islamic train terror plot in Canada
Ottawa, April 22, 2013– Today, the RCMP arrested two individuals and charged them with conspiring to carry out a terrorist attack against a VIA passenger train. The accused have been charged under sections 248, 235 (1), 83.2, 83.18, 83.21 of the Criminal Code of Canada. As a result of extensive collaborative efforts, the RCMP was able to disrupt the threat early. While the RCMP believed that these individuals had the capacity and intent to carry out these criminal acts, there was no imminent threat to the general public, rail employees, train passengers or infrastructure.
The two accused, Chiheb ESSEGHAIER and Raed JASER, who live in the Montreal and Toronto area were conspiring to carry out a terrorist attack against a VIA passenger train. Charges include conspiring to carry out an attack against, and conspiring to murder persons unknown for the benefit of, at the direction of, or in association with a terrorist group.
The RCMP investigation named Project SMOOTH, was coordinated by RCMP-led Integrated National Security Enforcement Teams (INSETs) in Montreal and Toronto with the close collaboration of domestic partners and the Federal Bureau of Investigations (FBI). The RCMP would like to thank its INSET partners including the Canadian Security Intelligence Service, Canada Border Services Agency, Toronto Police Service, York Regional Police, Peel Regional Police, Ontario Provincial Police, Durham Regional Police, the Sûreté du Québec and the service de police de la Ville de Montréal. The RCMP is also grateful for the valuable assistance of the FBI, Citizenship and Immigration Canada, Transport Canada, VIA Rail and CN Police. These exceptional collaborative efforts directly contributed to making the arrests.
“Each and every terrorist arrest the RCMP makes sends a message and illustrates our strong resolve to root out terrorist threats and keep Canadians and our allies safe,” stated Assistant Commissioner James Malizia, responsible for Federal Policing Operations. “A meaningful response to these threats begins on Canadian streets and in Canadians homes and the RCMP works with all their partners, including communities across Canada, in the fight against terrorism.”
The public is always encouraged to bring any suspicious activities to the RCMP’s attention through the National Security Information Network (1-800-420-5805) or by contacting the police in their community.
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New Zealand - May 20, 2013 14:47 - 3 Comments
Antarctic ice melting scare cancelled – climate science study
For decades, scientists have used ancient shorelines to predict the stability of today’s largest ice sheets in Greenland and Antarctica. Markings of a high shoreline from three million years ago, for example – when Earth was going through a warm period – were thought to be evidence of a high sea level due to ice sheet collapse at that time. This assumption has led many scientists to think that if the world’s largest ice sheets collapsed in the past, then they may do just the same in our modern, progressively warming world.
However, a new groundbreaking study now challenges this thinking.
Using the east coast of the United States as their laboratory, a research team led by David Rowley, CIFAR Senior Fellow and professor at the University of Chicago, has found that the Earth’s hot mantle pushed up segments of ancient shorelines over millions of years, making them appear higher now than they originally were millions of years ago.
“Our findings suggest that the previous connections scientists made between ancient shoreline height and ice volumes are erroneous and that perhaps our ice sheets were more stable in the past than we originally thought,” says Rowley. “Our study is telling scientists that they can no longer ignore the effect of Earth’s interior dynamics when predicting historic sea levels and ice volumes.”
The study, published online in Science on May 16, was a collaboration that included CIFAR Senior Fellows Alessandro Forte (Université du Québec à Montréal) and Jerry Mitrovica (Harvard), and a former CIFAR-supported post-doctoral fellow Rob Moucha (Syracuse).
“This study was the culmination of years of work and deep collaboration by researchers in CIFAR’s program in Earth System Evolution,” explains Rowley. “For this study, each of us brought our individual expertise to the table: Rob and Alex worked on simulations of Earth’s mantle dynamics, Jerry provided calculations on how glaciers warp Earth’s surface, and I shaped our understanding of the geology of the landscape we were looking at. This study would not have been possible without CIFAR.”
The team studied the coast from Virginia to Florida, which has an ancient scarp tens of metres above present-day sea level. Until now, many research groups have studied this shoreline and concluded that during a warm period three million years ago, the Greenland, West Antarctic and a fraction of East Antarctic ice sheets collapsed, raising the sea level at least 35 metres. But the new findings by Rowley and his team suggest that these ice sheets, particularly the East Antarctic Ice Sheet (the world’s largest), were probably more stable.
To do their study, the team used computer simulations to follow the movement of mantle and tectonic plates that occurred over time. Their prediction of how the ancient shoreline would have developed over millions of years matched what geologists mapping this ancient coast have observed. The next steps for the team are to try to make accurate predictions in other locations around the world.
“The paper is important because it shows that no prediction of ancient ice volumes can ever again ignore the Earth’s interior dynamics,” explains Rowley. “It also provides a novel bridge between two disciplines in Earth science that rarely intersect: mantle dynamics and long-term climate. It is the kind of study that changes how people think about our past climate and what our future holds.”
Source: http://www.cifar.ca/ancient-shorelines-ice-sheets-stability
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