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hatrack

(59,587 posts)
Mon Aug 24, 2020, 07:59 AM Aug 2020

Guardian - Since 1994, Earth Has Lost 28 Trillion Tons Of Ice To Global Warming

A total of 28 trillion tonnes of ice have disappeared from the surface of the Earth since 1994. That is stunning conclusion of UK scientists who have analysed satellite surveys of the planet’s poles, mountains and glaciers to measure how much ice coverage lost because of global heating triggered by rising greenhouse gas emissions.

The scientists – based at Leeds and Edinburgh universities and University College London – describe the level of ice loss as “staggering” and warn that their analysis indicates that sea level rises, triggered by melting glaciers and ice sheets, could reach a metre by the end of the century. “To put that in context, every centimetre of sea level rise means about a million people will be displaced from their low-lying homelands,” said Professor Andy Shepherd, director of Leeds University’s Centre for Polar Observation and Modelling.

The scientists also warn that the melting of ice in these quantities is now seriously reducing the planet’s ability to reflect solar radiation back into space. White ice is disappearing and the dark sea or soil exposed beneath it is absorbing more and more heat, further increasing the warming of the planet. In addition, cold fresh water pouring from melting glaciers and ice sheets is causing major disruptions to the biological health of Arctic and Antarctic waters, while loss of glaciers in mountain ranges threatens to wipe out sources of fresh water on which local communities depend.

“In the past researchers have studied individual areas – such as the Antarctic or Greenland – where ice is melting. But this is the first time anyone has looked at all the ice that is disappearing from the entire planet,” said Shepherd. “What we have found has stunned us.” The level of ice loss revealed by the group matches the worst-case-scenario predictions outlined by the Intergovernmental Panel on Climate Change (IPCC), he added.

EDIT

https://www.theguardian.com/environment/2020/aug/23/earth-lost-28-trillion-tonnes-ice-30-years-global-warming

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Guardian - Since 1994, Earth Has Lost 28 Trillion Tons Of Ice To Global Warming (Original Post) hatrack Aug 2020 OP
.... secondwind Aug 2020 #1
Kick and recommend for visibility bronxiteforever Aug 2020 #2
Thanks for posting this. k2qb3 Aug 2020 #3
Yes, the latent heat is what's most troubling in the process . . . hatrack Aug 2020 #5
K/R The future appalachiablue Aug 2020 #4
 

k2qb3

(374 posts)
3. Thanks for posting this.
Mon Aug 24, 2020, 04:19 PM
Aug 2020

I've been looking for exactly this data for a while now, would be nice to know the distribution too, how much ice we lost last year, but this helps.

A trillion tons of ice is a cube about 10km per side. The latent heat that represents is huge. Have to take that into account when assessing how strong the warming signal is.

hatrack

(59,587 posts)
5. Yes, the latent heat is what's most troubling in the process . . .
Mon Aug 24, 2020, 07:35 PM
Aug 2020

Melting the ice is the thermodynamic heavy lifting.

It takes one calorie to increase the temperature of a gram of liquid water 1C.

It takes 80 calories to melt a gram of ice at 0C into a gram of water at 1C.

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