Social Media Sidebar


Please sign up, comment on articles and bring your friends!

Current poll

PlanetTech is asking:

What do you think about our new web site?

Love it, indeed
Really good solution
Same as old one
The old one was better
This is a new option

Quote of the day

Just because something doesn’t do what you planned it to do doesn’t mean it’s useless.


Thomas Edison

Greenland's melting is 'feeding on itself,' scientists say

Posted in Science on 6th Mar, 2016 12:21 PM by AlexMuller

Yet another burst of bad news about Greenland, the vast northern ice sheet that contains 20 feet of potential sea level rise. The ice sheet is “darkening,” or losing its ability to reflect both visible and invisible radiation, as it melts more and more, the research finds. That means it’s absorbing more energy, which drives further melting.

“I call it melting cannibalism. You have melting feeding on itself,” says Marco Tedesco, the lead author of the study and a researcher with Columbia University’s Lamont Doherty Earth Observatory. The research was published in The Cryosphere by Tedesco and five other authors from U.S. and Belgian universities.
Scientists have long feared that when it comes to the Greenland ice sheet’s melt, there are a number of so-called “positive feedbacks,” or self-amplifying processes, that could make it worse. For instance, one of the best known of these involves simple elevation, a crucial feature for an ice sheet that is well over a mile high into the atmosphere in places.
If the ice sheet melts, it also slumps and becomes lower in the atmosphere. But air temperatures are warmer lower in the atmosphere. So the ice sheet melts more. And so on, and so on. In the new study, however, researchers examined a different so-called feedback, this one involving a property called the ice sheet’s “albedo,” or simply its overall reflectivity.
Bright white snow, falling atop the ice sheet, reflects light away, preventing it from being absorbed and thus blocking its heat energy from melting ice. However, there are many different hues and properties of ice and snow (and water), not all of which are equally reflective of either visible or non-visible radiation. (The “darkening” in question here refers both to changes that we can all see with our eyes, and also important changes that we can’t see).
For instance, melting and refreezing increases the grain size of particles of snow or ice, and near-infrared radiation then has a tougher time bouncing away, as opposed to being absorbed. Similarly, pools of standing water on the ice sheet surface also absorb more solar radiation, and warm up. And once melting gets through snow layers and into what researchers call “bare ice,” that too is darker than snow. “This bare ice is very dark, it melts much faster,” says Tedesco.

Tags: climateiceGreenlandclimate changeresearch

Read original article » Back to category


Author: Guest
Posted: 2016-03-07
Bad news. It looks like that because of several positive feedbacks the ice melting in Greenland is difficult to slow down - one already lost battle?!

Author: Guest
Posted: 2016-05-07
This is the pefrcet post for me to find at this time Reply


Recent headlines

  • Posted in Business on 2018-04-25 01:10:39
    Wind, solar deliver stunning 98 percent of new U.S. more
    Posted in Software on 2018-04-25 01:05:01
    Robot automation leaders Foxconn and Tesla face more
    Posted in Business on 2018-04-23 23:22:30
    Climate change: Michael Bloomberg pledges $4.5m for more
    Posted in Medicine on 2018-04-23 23:17:24
    The foods that might help with more
    Posted in Hardware on 2018-04-22 23:49:35
    NASA’s proposed multi-billion orbiting moonbase used more
Posted in Business on 2013-10-10 01:33
China is working towards a manned lunar mission in more
Posted in Business on 2013-10-20 07:17
Spacex says China is their main competitor for more
Posted in Software on 2013-10-20 06:43
Pirate Bay Browser Clocks 1,000,000 more
Posted in Medicine on 2013-10-10 02:10
Google reportedly investing hundreds of millions into more
Posted in Medicine on 2013-10-14 03:13
Endothelial Cells Can Repair and Regenerate Organs, more
Posted in Science on 01.01.2010
Spacex says China is their main competitor for more
Posted in Science on 01.01.2010
Staring at Your Phone Could Be Making You Short more
Posted in Science on 01.01.2010
Oculus Rift virtual reality headset coming to mobile, more
Posted in Science on 01.01.2010
China is working towards a manned lunar mission in more
Posted in Science on 01.01.2010
Delivering drugs via nanoparticles to target more

Recent Blog Posts

  • Posted by AlexMuller
    In five years quantum computing will be more
    Posted by AlexMuller
    Google partners with Johnson and Johnson to make lower more
    Posted by AlexMuller
    Electron holography microscope with spatial resolution down more
    Posted by AlexMuller
    Lower cost advanced Nuclear power could dominate future US more
    Posted by AlexMuller
    Why Hasn’t AI Mastered Language Translation? more

Login to your Account

Login to your PlanetTech Account here

Remember me

Create a New Account

You just need username and password

The following errors occured:
Verify password:
Remember me