PNS National Newscast

Audio Activation
"Siri, play the Public News Service (podcast)"
"Hey Google, play the Public News Service podcast"
"Alexa, play Public News Service podcast"
or "Alexa, what's my news flash?" once you set it up in the Alexa app

2020Talks

Audio Activation
"Siri, play the 2020Talks podcast"
"Hey Google, play the 2020Talks podcast"
"Alexa, play Two-Thousand-Twenty Talks podcast"
or "Alexa, what's my news flash?" once you set it up in the Alexa app

Newscasts

PNS Daily Newscast - November 27, 2020. 


A call on state congressional delegations to speed COVID-19 economic relief; a gap in trapping pollution impacts communities of color.


2020Talks - November 25, 2020 


CORRECTED 2:30pm MST 11/25 - Linda Thomas-Greenfield would be the second Black woman in US UN Ambassador role, Susan Rice was the first. Biden nominees speak; how can social media spread less misinformation and be less polarizing. *2020Talks will not be released 11/26 & 11/27*

CU Study: Warming Ocean Water Undercuts Antarctic Ice Shelves

New University of Colorado research shows that upside-down rivers, created by warming ocean water, are threatening ice shelves across the Antarctic continent. (Pixabay)
New University of Colorado research shows that upside-down rivers, created by warming ocean water, are threatening ice shelves across the Antarctic continent. (Pixabay)
March 21, 2016

DENVER – Upside-down rivers of warming ocean water are a threat to the stability of floating ice shelves in Antarctica, according to a new report from the University of Colorado's National Snow and Ice Data Center.

Ice shelves are thick, floating plates of ice that have drifted away from the continent and spread out onto the ocean.

Karen Alley, a doctoral student who led the study, says knowing how shelves work will become more important as the planet gets warmer.

"They run into islands and peninsulas and pieces of the bedrock that help hold back the ice on the continent,” she explains. “And so if you lose an ice shelf, suddenly the ice behind it can flow much more quickly into the ocean. So they're really important for regulating sea-level rise."

The University of Colorado research found upside-down rivers, or basal channels, all around the Antarctic continent.

Alley says in many cases, the channels were making the ice shelves more vulnerable to collapse. She notes that while shelves take thousands of years to grow, they can disintegrate in a matter of weeks.

Both NASA and the National Oceanic and Atmospheric Administration have confirmed that February 2016 was the planet's warmest February since record keeping began in 1880.

Alley notes that ice shelves are especially vulnerable because climate change hits them from the air above and water below. She says although more research is needed to find all factors that can destabilize shelves, the basal channels are a key discovery.

"This is one potential factor,” she states. “If we're going to predict how sea level rise will work in the future, how fast things will change, we have to understand ice shelves."

When a channel is carved into the underside of an ice shelf, the top sags, leaving a visible wrinkle on the smooth surface. Alley's team used satellite photos to map wrinkles across the continent, and radar imaging to locate the rivers flowing beneath the ice.




Eric Galatas, Public News Service - CO