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Greenland's meltdown melted at exceptional speed over 350 years or more – Axios

The size of the latest greenland melting is "exceptional" compared with historical data in the past 350 years, according to…

The size of the latest greenland melting is “exceptional” compared with historical data in the past 350 years, according to a new study by a research team from the United States and the Netherlands.

Background: ] In terms of greenland and sea level rise, the basics are well-known – the temperature of the air increases, causing the ice to melt from above. The water percolates down through the ice and eventually flows into the ocean, where it adds to sea level. At the same time, the glaciers accelerate their flow into the ocean as heating of ocean temperatures eats away from them below.

Yes, but: The big question is – to what extent is the surface of the summer surface melted unusual?

Why it matters: Refining the rise in sea level would help researchers predict how much damage can be expected in the coastal areas of the world. It would also help them to determine what to expect from a slowdown in a crucial ocean stream that draws heat north of the equator, changes ecosystems and weather patterns.

What They Did: The researchers collected and analyzed ice cores from Central Western Greenland and a coastal area on the Nuussuaq Peninsula in 2015.

  • They could detect when the ice melted and refroze, and how often and significantly it did through time .
  • These observations provide a critical window of how ice melting varies over time, as well as the melt intensity and amount of water running out of the surface, which are the most important ways in which the ice loses mass.
  • The co-author of the study compiled a 330-year record of melting, percolation and refreezing in the island’s western central region and a 364-year record of the same variables at more coastal locations.

What They Found: In the last decades there was a clear wars of war d more melting, watercooling through ice and refreezing every winter.

  • The study found an increase in melt intensity of 250% -575% over the last 20 years compared with pre-industrial times.
  • And the last decade had a more sustainable and significant melting amount than any other 10-year period in the ice core.
  • The core registers matched with computer models and satellite observations of the ice as a whole. [19659009] The study concluded that when the ice melts the dark surface, absorbs more heat and melts more ice. While this process has long been known, the new investigation emphasizes its significance, as it means that the surface of the ice can be extremely sensitive to seemingly small spikes in summer temperatures.

    “As a result, Greenland is more sensitive to temperature change today than a few decades ago. Heating is more than ever.”

    Bottom line: “This is a climate record that you can easily add together with a story book – clear to see [the] human fingerprints on Greenland’s Ice Sheet, “says Robin Bell, a research professor at the Lamont-Doherty Earth Observatory at Columbia University, at Axios. Bell was not involved in the study.

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