Categories: world

Greenland's ice sheet grew in the 1970s. Now it loses trillion pounds each year

Greenland's melting of ice melts six times faster than it was in the 1 980s. And all this melt water directly raises the sea level. It is all according to a new study, published yesterday (April 22) in the journal Proceedings of the National Academy of Sciences, which carefully reconstructs the behavior of the impact of the decades before modern measuring tools became available. Scientists already knew that there was much more ice in Greenland in the 1970s and 1980s. And they have had accurate measurements of the increase in melting since the 1990s. Now they know how dramatically things have changed over the past 46 years. "When looking at several decades, it is best to sit back in your chair before looking at the results, because it is a little scary to see how quickly it changes," says University of California, Irvine, glaciologist Eric Rignot, Greenland is just an island. But the ice has the potential to transform the entire planet. The Greenland ice sheet has been around for 2.4 million years and is 2.3 kilometers thick at its deepest point. about half as much as the Earth's whole atmosphere, or 6 quintillion – or 6 with 18 zeros after that – lbs. (2.7 quintillion kilograms). If it melted completely, the sea level would rise by 7.4 meters. The figure uses laser laser scientists to measure the height of the ice, measurements of the total gravity of the ice and satellite photos to measure changes in ice thickness, so…

Greenland’s melting of ice melts six times faster than it was in the 1

980s. And all this melt water directly raises the sea level.

It is all according to a new study, published yesterday (April 22) in the journal Proceedings of the National Academy of Sciences, which carefully reconstructs the behavior of the impact of the decades before modern measuring tools became available. Scientists already knew that there was much more ice in Greenland in the 1970s and 1980s. And they have had accurate measurements of the increase in melting since the 1990s. Now they know how dramatically things have changed over the past 46 years.

“When looking at several decades, it is best to sit back in your chair before looking at the results, because it is a little scary to see how quickly it changes,” says University of California, Irvine, glaciologist Eric Rignot, Greenland is just an island. But the ice has the potential to transform the entire planet. The Greenland ice sheet has been around for 2.4 million years and is 2.3 kilometers thick at its deepest point. about half as much as the Earth’s whole atmosphere, or 6 quintillion – or 6 with 18 zeros after that – lbs. (2.7 quintillion kilograms). If it melted completely, the sea level would rise by 7.4 meters.

The figure uses laser laser scientists to measure the height of the ice, measurements of the total gravity of the ice and satellite photos to measure changes in ice thickness, so they know that the sheet melts four times faster than it was in 2003, as Live Science’s previous reports

To expand this item further into the past, researchers shared Greenland in 260 “ice”, which they studied individually using a combination of direct measurements of ice changes in satellite images and sophisticated computer models of ice behavior. They found that between 1972 and 1980, Greenland actually received about 100 trillion lbs. (47 trillion kg) ice per year. The real mass loss that they found began in the 1980s. Between 1980 and 1990, the island lost in the ballpark of £ 112 trillion. (51 trillion kg) ice per year. Between 1990 and 2000, it lost around £ 90 trillion. (41 trillion kg) per year.

Since the 21st century things have increased dramatically.

Between 2000 and 2010, Greenland lost about £ 412 trillion. (187 trillion kg) ice per year. Between 2010 and 2018, the ice lost about 631 trillion pounds. (286 trillion kilograms) of ice per year.

These figures make concrete what researchers and residents of Greenland already knew: that the island is changing and its old glaciers are lowering at an alarming rate. The dramatic increase in ice loss over the past two decades coincides with a similar increase in atmospheric greenhouse gases and heating. As Live Science reported earlier this year, nine of the 10 hottest winters have been on record since 2005.

A chart from the National Oceanic and Atmospheric Administration shows the drastic increase in atmospheric carbon dioxide measured in Hawaii over the past few decades.

Credit: NOAA

What does this mean for all the future of the ice and global sea levels?

Originally published on Live Science .

Share
Published by
Faela