Melting ice caps slowing earth's spin
By Catherine Griwkowsky, Edmonton Sun
First posted: Friday, December 11, 2015 06:38 PM EST | Updated: Friday, December 11, 2015 11:48 PM EST
As the glaciers melt, the world turns more slowly.
Scientists out of the University of Alberta Faculty of Science found a rise in sea levels isn’t the only effect of melting glaciers – the Earth’s mass has shifted from the poles to the equator. That - combined with changes in the earth’s core - account for longer days, according to research from physics professor Mathieu Dumberry.
“Over the past 3,000 years, the core of the Earth has been speeding up a little, and the mantle-crust on which we stand is slowing down,” said Dumberry, who is an expert in the Earth’s rotation.
In a century, the earth will rotate 1.7 milliseconds slower - a tiny amount, which adds up, Dumberry said.
The study – titled “Reconciling past changes in Earth’s rotation with 20th century global sea-level rise: Resolving Munk’s enigma” - was published in Science Advances on Friday.
Dumberry says his findings give more reasons for probing for answers deep within the planet.
The study also gives answers to where sea levels will be at the end of the century.
“This can help to better prepare coastal towns, for example, to cope with climate change,” says Dumberry. “We’re talking billions of dollars of infrastructure here.”
catherine.griwkowsky@sunmedia.ca
@SunGriwkowskyC
U of A physics professor Mathieu Dumberry says a rise in sea levels isn’t the only effect of melting glaciers – the Earth’s mass has shifted from the poles to the equator. Photo supplied
Melting ice caps slowing earth's spin | Canada | News | Toronto Sun
By Catherine Griwkowsky, Edmonton Sun
First posted: Friday, December 11, 2015 06:38 PM EST | Updated: Friday, December 11, 2015 11:48 PM EST
As the glaciers melt, the world turns more slowly.
Scientists out of the University of Alberta Faculty of Science found a rise in sea levels isn’t the only effect of melting glaciers – the Earth’s mass has shifted from the poles to the equator. That - combined with changes in the earth’s core - account for longer days, according to research from physics professor Mathieu Dumberry.
“Over the past 3,000 years, the core of the Earth has been speeding up a little, and the mantle-crust on which we stand is slowing down,” said Dumberry, who is an expert in the Earth’s rotation.
In a century, the earth will rotate 1.7 milliseconds slower - a tiny amount, which adds up, Dumberry said.
The study – titled “Reconciling past changes in Earth’s rotation with 20th century global sea-level rise: Resolving Munk’s enigma” - was published in Science Advances on Friday.
Dumberry says his findings give more reasons for probing for answers deep within the planet.
The study also gives answers to where sea levels will be at the end of the century.
“This can help to better prepare coastal towns, for example, to cope with climate change,” says Dumberry. “We’re talking billions of dollars of infrastructure here.”
catherine.griwkowsky@sunmedia.ca
@SunGriwkowskyC
U of A physics professor Mathieu Dumberry says a rise in sea levels isn’t the only effect of melting glaciers – the Earth’s mass has shifted from the poles to the equator. Photo supplied
Melting ice caps slowing earth's spin | Canada | News | Toronto Sun