With our free press under threat and federal funding for public media gone, your support matters more than ever. Help keep the LAist newsroom strong, become a monthly member or increase your support today.
Why is Antarctica's Totten Glacier shrinking faster than its neighbors?
This image shows the Totten Glacier ice shelf in East Antarctica (the wrinkled white area at top left) on Sept. 25, 2013. Two large sea ice openings are visible, as are as several smaller ones. The open-water areas are bright black.
(
NASA / JPL
)
This picture shows how openings in sea ice, known as polynya, help create cold, dense water that protects the base of a glacier from the melting effects of warmer ocean water.
(
NASA / JPL
)
This chart shows the amount of thinning of both the Totten Glacier and its neighbor the Moscow University Glacier. The dark blue lines on Totten indicate more significant lowering of the glacier's surface.
(
NASA / JPL
)
Listen
3:35
Why is Antarctica's Totten Glacier shrinking faster than its neighbors?
Figuring out what causes glaciers to shrink is important because melting glaciers are one of the factors behind rising sea levels.
So when scientists noticed a massive glacier in East Antarctic was thinning faster than its neighbors, it became a hot topic of research.
Ala Khazendar is a scientist with NASA's Jet Propulsion Laboratory and he recently co-authored a paper on this chunk of ice named Totten Glacier.
His team looked at data from 2003 to 2009 showing Totten was shrinking faster than any other glacier in the region. In one area the ice was reducing by as much as 1.7 meters a year.
Sponsor
"Which is a lot," Khazendar said.
To help solve the mystery of the incredible shrinking glacier, Khazendar and his team used to computer models and satellite data to study the region.
Blowing in the wind
The researchers found that changes in icy Antarctic wind patterns might be partially responsible for Totten's rapid thinning.
Khazendar says normally, during the winter months, cold winds blow openings in the sea ice around Totten glacier. Khazendar says these openings expose the ocean water to the freezing air.
"Which means that the ocean will continue losing heat to the atmosphere."
This allows those icy winds to cool off the normally warmer ocean water. That frigid water then sinks to the base of the glacier, creating pockets of near freezing water that keep things from melting too fast.
Khazendar theorizes that one reason Totten Glacier might be melting so fast is because fewer of these opening are forming in the sea ice.
Sponsor
Shifting wind patterns could be to blame, but he says other factors are likely involved as well.
"This is just an example of how much more we still have to work out and understand."
What's in a name?
Totten Glacier was named for U.S. Navy midshipman George M. Totten who served on board the USS Vincennes under the command of Lieutenant Charles Wilkes.
The Vincennes was the first US warship to circumnavigate the globe. It visited Antarctica in 1839.
At LAist, we believe in journalism without censorship and the right of a free press to speak truth to those in power. Our hard-hitting watchdog reporting on local government, climate, and the ongoing housing and homelessness crisis is trustworthy, independent and freely accessible to everyone thanks to the support of readers like you.
But the game has changed: Congress voted to eliminate funding for public media across the country. Here at LAist that means a loss of $1.7 million in our budget every year. We want to assure you that despite growing threats to free press and free speech, LAist will remain a voice you know and trust. Speaking frankly, the amount of reader support we receive will help determine how strong of a newsroom we are going forward to cover the important news in our community.
We’re asking you to stand up for independent reporting that will not be silenced. With more individuals like you supporting this public service, we can continue to provide essential coverage for Southern Californians that you can’t find anywhere else. Become a monthly member today to help sustain this mission.
Thank you for your generous support and belief in the value of independent news.
But the game has changed: Congress voted to eliminate funding for public media across the country. Here at LAist that means a loss of $1.7 million in our budget every year. We want to assure you that despite growing threats to free press and free speech, LAist will remain a voice you know and trust. Speaking frankly, the amount of reader support we receive will help determine how strong of a newsroom we are going forward to cover the important news in our community.
We’re asking you to stand up for independent reporting that will not be silenced. With more individuals like you supporting this public service, we can continue to provide essential coverage for Southern Californians that you can’t find anywhere else. Become a monthly member today to help sustain this mission.
Thank you for your generous support and belief in the value of independent news.
Senior Vice President News, Editor in Chief
