Photo appearing to show dogs walking on water highlights Greenland's melting ice
22 Juin, 2019, 13:28 | Auteur: Therese Cote
With them, they have predicted that the ice from Greenland will melt up to the year 3000. This could raise sea levels by over seven meters (23 feet).
Along with the worldwide penalties of the ice melt, locals in Greenland are encountering a terrain fully transformed from its usual state.
Scientists have warned that Greenland will be ice-free in the next thousand years unless greenhouse gas emissions are substantially reduced.
Their findings showed that if we continue along our current trajectory of warming, 100 percent of Greenland's present-day ice mass will be gone. The model took into account atmospheric and ocean conditions as well as ice geometry, flow and thickness.
Just as an early melt in Greenland can cause more melting later in the year, the loss of ice can have an amplifying effect on global temperatures because less heat is reflected off the planet. And analysis exhibits that in recent times its ice has melted sooner than ever earlier than.
As ocean waters have warmed over the past two decades, they have melted the floating ice that once shielded the outlet glaciers. Rapid melt and sea ice with low permeability and few cracks leaves the melt water on top'.
"How Greenland will look in the future - in a couple of hundred years or in 1,000 years - whether there will be Greenland, or at least a Greenland similar to today, it's up to us", said Andy Aschwanden, a research associate professor at the University of Alaska Fairbanks Geophysical Institute.
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Simulating ice sheet behavior is hard because ice loss is led by the retreat of outlet glaciers. The more ice touches water, the faster it melts.
"At the end of the day, glaciers flow downhill", Aschwanden said. "That's very simplified, but if you don't know where downhill is, the model can never do a good job. So the most important contributor to understanding ice flow is knowing how thick the ice is".
Each of the three emissions scenarios used in the study produced different patterns of ice retreat across Greenland.
Scientists are working to understand how Greenland's ice sheet will respond to future warming. It rises high enough into the atmosphere to alter the weather around it, as mountains do.
In the next 200 years, the ice sheet model shows that melting at the present rate could contribute 48 to 160 centimeters (19 to 63 inches) to global sea level rise, 80 percent higher than previous estimates. "It's an indication that the climate is now warmer than at any time in the last 5,000 or more years". That is a month sooner than is typical and one thing that is occurred only is as soon as earlier than in the historical document, in 2016. It has measured the height of the ice below its flight path as well as the bedrock under the ice sheets.
"Ice is in very remote locations", said Fahnestock. As for what we will see in the future, "it depends on what we are going to do next". "Only NASA had an aircraft with the instruments and technology we needed and could go where we needed to go". It is Earth's second-largest deposit of land-based mostly ice after Antarctica.
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