Feeds

America haunted by ghost of ice gravity

Actual proper research, honest

Providing a secure and efficient Helpdesk

Canadian researchers have found a gravitational shadow hanging over North America, left over from the last ice age. The work is published in the May 11 edition of the journal Science.

Using four years of data from the Gravity Recovery and Climate Experiment (GRACE) satellite mission – a pair of satellites that are measuring the Earth’s gravitational field to determine how mass is being redistributed on the planet - the scientists were able to construct an image of the long-vanished Laurentide ice sheet.

Professor Jerry Mitrovica, of the U of T and one of the paper's authors, describes the phenomenon as "the ghost of the ice age" that still hangs over the continent.

This was a truly massive ice sheet. It had two enormous domes one east and the other west of the Hudson Bay area. When it receded, global sea levels went up about sixty metres. Its immense weight actually compressed the Earth's crust.

"These are parts of the crust that haven’t completely rebounded from the giant depression caused by the ice," explains Dr. Mark Tamisiea, of the Harvard-Smithsonian Center for Astrophysics.

"The ongoing uplift of the land continues to have an effect on gravity. Constraining the geometry of the ice is important to understanding ice age climate, and it is also important for making accurate corrections before we interpret modern climate records." ®

Internet Security Threat Report 2014

More from The Register

next story
MARS NEEDS WOMEN, claims NASA pseudo 'naut: They eat less
'Some might find this idea offensive' boffin admits
LOHAN crash lands on CNN
Overflies Die Welt en route to lively US news vid
Comet Siding Spring revealed as flying molehill
Hiding from this space pimple isn't going to do humanity's reputation any good
Experts brand LOHAN's squeaky-clean box
Phytosanitary treatment renders Vulture 2 crate fit for export
No sail: NASA spikes Sunjammer
'Solar sail' demonstrator project binned
Carry On Cosmonaut: Willful Child is a poor taste Star Trek parody
Cringeworthy, crude and crass jokes abound in Steven Erikson’s sci-fi debut
Origins of SEXUAL INTERCOURSE fished out of SCOTTISH LAKE
Fossil find proves it first happened 385 million years ago
Human spacecraft dodge COMET CHUNKS pelting off Mars
Odyssey orbiter yet to report, though - comet's trailing trash poses new threat
prev story

Whitepapers

Forging a new future with identity relationship management
Learn about ForgeRock's next generation IRM platform and how it is designed to empower CEOS's and enterprises to engage with consumers.
Why and how to choose the right cloud vendor
The benefits of cloud-based storage in your processes. Eliminate onsite, disk-based backup and archiving in favor of cloud-based data protection.
Three 1TB solid state scorchers up for grabs
Big SSDs can be expensive but think big and think free because you could be the lucky winner of one of three 1TB Samsung SSD 840 EVO drives that we’re giving away worth over £300 apiece.
Reg Reader Research: SaaS based Email and Office Productivity Tools
Read this Reg reader report which provides advice and guidance for SMBs towards the use of SaaS based email and Office productivity tools.
Security for virtualized datacentres
Legacy security solutions are inefficient due to the architectural differences between physical and virtual environments.