Free Newsletters - Space - Defense - Environment - Energy - Solar - Nuclear
..
. Earth Science News .




ICE WORLD
'Noisy' glaciers sound off as they melt into ocean waters
by Staff Writers
Fairbanks, Alaska (UPI) Nov 28, 2013


disclaimer: image is for illustration purposes only

The sizzle of glacier ice as it melts into the sea creates one of the loudest natural marine environments on Earth, researchers in Alaska say.

The popping, crackling noises, caused by trapped air bubbles squirting out of disappearing ice, could provide clues to the rate of glacier melt and help researchers better monitor fast-changing polar environments, University of Alaska researchers reported Thursday.

Geophysicist Erin Pettit said she often hears such sounds when kayaking in frigid northern waters, and when she set up microphones underwater the sounds came through even louder.

"If you were underneath the water in a complete downpour, with the rain pounding the water, that's one of the loudest natural ocean sounds out there," she said. "In glacial fjords we record that level of sound almost continually."

To confirm the glacial source of the sound, chunks of glacier ice were placed in a tank of chilled water, and video and audio recordings were able to match sounds captured to the escape of bubbles from the ice.

"Most of the sound comes from the bubbles oscillating when they're ejected," said Kevin Lee, an acoustics experts from the University of Texas who helped conduct the lab experiment.

"A bubble when it is released from a nozzle or any orifice will naturally oscillate at a frequency that's inversely proportional to the radius of the bubble," he said, meaning the smaller the bubble, the higher the pitch.

The bubble sounds recorded were right in the middle of the frequencies humans can hear, the researchers said.

Using hydrophone recordings of sounds in glacial fjords might help monitor relative changes in glacier melting in response to one-time weather events, seasonal changes, and long-term climate trends, they said.

.


Related Links
Beyond the Ice Age






Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle




Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News





ICE WORLD
Greenland's shrunken ice sheet: We've been here before
Buffalo NY (SPX) Nov 28, 2013
Think Greenland's ice sheet is small today? It was smaller - as small as it has ever been in recent history - from 3-5,000 years ago, according to scientists who studied the ice sheet's history using a new technique they developed for interpreting the Arctic fossil record. "What's really interesting about this is that on land, the atmosphere was warmest between 9,000 and 5,000 years ago, m ... read more


ICE WORLD
Typhoons spread Fukushima fallout, study warns

85 people injured in Hong Kong high-speed ferry accident

Philippines says Super Typhoon Haiyan, other storms curb growth

Mass vaccinations for children in typhoon-hit Philippines

ICE WORLD
Use of ancient lead in modern physics experiments ignites debate

Crippled space telescope given second life, new mission

Scientists create perfect solution to iron out kinks in surfaces

What might recyclable satellites look like?

ICE WORLD
Arctic seafloor methane releases double previous estimates

Sea level rise could exceed one meter in this century

China desert lake shrinks by one-third in 13 years: Xinhua

Sea level rise forecasts helped by insights into glacier melting

ICE WORLD
'Noisy' glaciers sound off as they melt into ocean waters

Russian court frees last Greenpeace activist

Greenland's shrunken ice sheet: We've been here before

IceBridge at McMurdo: A Year and a Half of Planning

ICE WORLD
Flower Power - Researchers breed new varieties of chamomile

A plant which acclimatizes with no exterior influence

Archaeologists discover largest, oldest wine cellar in Near East

Typhoon-hit Philippine farmers risk 'double tragedy': FAO

ICE WORLD
Quake near Iran nuclear plant kills 8

2013 hurricane season said quietest since 1950

Indian cyclone weakens, 'no danger,' says weather office

18,000 Indonesians flee erupting volcano

ICE WORLD
Several said dead in air raid in Sudan's Darfur: peacekeepers

Nigeria military says bombed Boko Haram camps

Mozambique police fire tear gas at anti-conscription protest

Chinese businessman charged in Zambia graft case

ICE WORLD
Study suggests inbreeding shaped course of early human evolution

Investments in Aging Biology Research will Pay Longevity Dividend

Research team discovers 'immune gene' in Neanderthals

Ancient, modern DNA tell story of first humans in the Americas




The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement