Wednesday , September 28 2022

Iceland Greenland melting rate is accelerating, scientists confirm – Science News



[ad_1]

He says it has been a bad year for climate change news as a substatement.

The key points that melts in the greener

Key points:

  • The melting rate of the greenhouse has been up to five times more in the last 20 years than pre-industrial rates
  • Melting follows an explanatory path where small temperatures increase much more equitable melting rates
  • The Greenland ice leaflet holds enough water to raise sea levels of 7 meters

The UN Environment and the Intergovernmental Panel on Climate Change (IPCC) sounded the alarm over the unfortunate trajectory that we have on, and we needed the huge efforts to restrict heating to 2 degrees Celsius above pre-industrial levels.

And in June, research published in Nature reportedly tripled the melting rate of ice leaflet Antarctica over the last five years.

Now, new research announced in Nature today has confirmed that there is a similar trend in the Greenland ice leaflet.

Ice color researchers used to create an ongoing 350 year analysis of the melting rate of ice in mid west.

The ice core is a sample taken from an ice pack with an empty drill, revealing a cross section that looks back in time effectively, just like a tree ring.

It was found that the rate of melting was as much as five times higher than pre-industrial melting rates in the past 20 years, and that the rate of melting increased, according to researcher Luke Trusel of the University of Rowan in the United States.

"The main conclusion we have received is that it has become more melting in the last decades than at any time in the last four centuries, and it's probably more than any time in the last seven to eight years," said Dr Trusel .

According to their ice core samples, 2012 was "stubborn" the most intense melting year on a record in the Groenland.

A growing rate of melting was found in the ice ponds that started in the mid 1800's, which was about at the same time as the start of industrial phase Arctic heat.

But in the 1970s the melting broke clearly the natural range of diversity.

In other words, we expect to see some differences in melting between years, but during the 1970s melting occurred at a scale beyond what could possibly be explained by a variation of the average level of ice cover.

Over 7 meters of sea level rise closing in Iceland & Greenland

Significantly, they have confirmed that the rising melting rate follows an explanatory exposure, caused by positive feedback as the impact of albedo, according to Dr Trusel.

The albedo effect describes the phenomenon where dark surfaces absorb more heat than reflective white surfaces such as ice and snow.

When ice drops, the darker ground absorbs more energy from the sun, which causes even more melting – creating a feedback loop.

"The ice leaf response to a warming climate is not linear," said Dr Trusel.

"That's what's practical, that's what we say, we have half a degree of warmth today, that would produce twice as much or more than half a degree that occurred at some time in the past."

Most of the previous research has used satellite observations and computer modeling to calculate the rate of melting in the Greenland.

This new research has allowed scientists to cross-refer their satellite observations against physical ice pools, according to Dr Trusel.

The ability to track 350-year melting rates is a special strength of this latest research, according to Matt King of UTAS, which was not part of this study.

"We have not had a wide-ranging assessment, certainly going back almost Shakespeare time," said Professor King.

"Oh, this kind of measurement, we can learn a lot about how fast things are changing in the Groenland."

And understand how fast the ice sheet melts is crucial for us to prepare for the future impact of rising sea levels, according to Professor King.

According to the IPCC's report this year, warming up between 1.5C and 2C locks in the whole of the Wonders wound.

This means, ultimately, that the Gwlad y Groen ice leaflet will cause the oceans around the world to rise on an average of more than 7 meters.

"So there are two questions: Have we passed the threshold [and] secondly how fast it is [melting] is going to happen, "said Professor King.

"It could be thousands of years or it could be hundreds of years and that's the kind of question that we are trying to answer."

And there are very unusual things on this planet;

Although climate change has so far warmed around 1C since pre-industrial levels, that warmth has not been uniform.

In the Arctic and Greenland, heated signs have been identified starting in the 18th century, and the average summer temperatures have risen by around 2C since the 1990's.

A process of the name is a polar expansion, and it means that a slight increase in the global average temperature will have the greatest impact in polar regions.

And other positive feedback is also considered.

Most of us know, as we climb a mountain, the temperature falls, and vice versa.

The Greenland ice leaflet is up to 3 kilometers thick in places, but as it melts, the height of the surface layer is reduced.

In turn, the surface comes in with warmer air and melting increases.

The complexity of ice melting, and the potential that affects the planet of the ice-leafing Icelandic leaflet, means that we need to seriously consider the effects our actions today will be in their get on the future, according to Dr Trusel.

"We might think that the Greenland is remote and not very important, but when the Greenland is changing it's affecting coasts around the world," said Dr Trusel.

According to Professor Brenin, this research is yet another call from a year of high seamless calls.

"This reminds everyone in the global community again that there are very unusual things on this planet."

ABC science promo

Want more science from across the ABC?

[ad_2]
Source link