Today, Greenland ice sheets melt 50% above preindustrial levels and 33% above the level of the 20th century, the researchers found.
"What we were able to show is the melting of this Greenland Today's experience is truly unprecedented and out of the charts in the longer term," said Sarah Das, associate scientist at the Woods Hole Oceanographic Institution and co-author of the study.
To determine how fast the Greenland ice cream is Compared to the past, the scientist retreats. Eiskernproben were taken with a drill the size of a traffic light stick.
Samples were taken at locations more than 6,000 feet above sea level, giving researchers a window to melt on the ice surface over the past centuries.
The melting of the Greenland Ice Sheet is the biggest driver of global sea-level rise, which scientists can predict will flood coastal cities and settlements in the coming decades.
The study also found that ice loss in Greenland is primarily due to warmer summer air, and even a small increase in temperature can trigger an exponential rise in ice melt rate.
"As the atmosphere continues to warm, melting will surpass and accelerate this warming," said Luke Trusel, assistant professor at Rowan University, and co-authored.
According to Trusel, the current In the scientific community, it is considered that there is a temperature threshold that could trigger a point of no return of the possible melting of the ice sheets in Greenland and the Antarctic. And although we do not know exactly what this temperature tipping point is, "it's clear that the more we heat up, the more ice melts."
"Once the ice sheets reach these tipping points, it is believed that they will do so. Enter a state of irreversible retreat so that they will respond to what we have been doing for centuries and millennia into the future," Trusel said ,
Although the climate emphasizes that although climate science often focuses on the future effects of warming, the results show that the climate is already changing significantly.
"Climate change – be it in Greenland or in your backyard – is already here and already having implications and is already affecting people, it is not something that will come in the future, and this study really does bring that point home, "she said.