Greenland loses 4 trillion pounds of ice in one day
Normally, the landscape in this photo would be a white ice sheet.
- Climate scientists say that Greenland is experiencing ice losses that are unusually early and heavy.
- Two main weather factors are fueling the losses: a high-pressure system and the resulting low cloud cover.
- Greenland is a major contributor to sea-level rise.
Four trillion pounds of ice melted in Greenland on June 13 due to unusually warm and sunny weather, scientists report. Although it's normal for ice to melt during Greenland's "melt season," the ice this year is melting earlier than expected and at an alarmingly fast rate.
"It's very unusual to have this much melt so early in the season," William Colgan, senior researcher at the Geological Survey of Denmark and Greenland, told the BBC. "It takes very rare conditions but they're becoming increasingly common."
Greenland's current ice loss is on track to break records. In 2012, the island nation saw similarly severe losses, which, like current melting, was fueled by two main weather factors: a high-pressure system that carried warm air from the Central Atlantic to the skies over Greenland, causing warmer temperatures, and the resulting low cloud cover and snowfall, which allowed sunlight to hit the vast ice sheets.
Frozen white ice reflects most sunlight back into the sky. But melting ice turns into darker colors, which absorb more light and heat. This creates a positive feedback loop that speeds up melting.
"You've experienced this if you've walked down the road barefoot on a hot summer day," geologist Trevor Nace wrote for Forbes.
"The black asphalt is much hotter than the white concrete sidewalk. This is due to the difference in how much solar radiation white versus black reflects. Hence, as Greenland melts more of its ice, the surface is converted from a high albedo white to darker colors. This, in turn, causes more melting and adds to the positive feedback loop."
This figure depicts how radiation from the sun is reflected or absorbed by different terrains. More radiation is reflected by white snow and ice, while more radiation is absorbed by dark surfaces, such as water.
Arctic Monitoring and Assessment Programme/https://amap.no
Steffen Olsen, a scientist with the Danish Meteorological Institute, got an eerie up-close look at the changing ice sheets last week. Olsen was on a routine mission to pick up weather monitoring tools on sea ice in northwest Greenland when he saw meltwater pooled up on the sheet's surface, making it look like his sled dogs were walking on water.
Greenland's rapidly melting ice could raise global sea levels.
"Greenland has been an increasing contributor to global sea level rise over the past two decades," Thomas Mote, a research scientist at the University of Georgia who studies Greenland's climate, told CNN. "And surface melting and runoff is a large portion of that."
Young people could even end up less anxiety-ridden, thanks to newfound confidence
- The coronavirus pandemic may have a silver lining: It shows how insanely resourceful kids really are.
- Let Grow, a non-profit promoting independence as a critical part of childhood, ran an "Independence Challenge" essay contest for kids. Here are a few of the amazing essays that came in.
- Download Let Grow's free Independence Kit with ideas for kids.
Philosophers like to present their works as if everything before it was wrong. Sometimes, they even say they have ended the need for more philosophy. So, what happens when somebody realizes they were mistaken?
Sometimes philosophers are wrong and admitting that you could be wrong is a big part of being a real philosopher. While most philosophers make minor adjustments to their arguments to correct for mistakes, others make large shifts in their thinking. Here, we have four philosophers who went back on what they said earlier in often radical ways.
Or is doubt a self-fulfilling prophecy?
The future of learning will be different, and now is the time to lay the groundwork.
- The coronavirus pandemic has left many at an interesting crossroads in terms of mapping out the future of their respective fields and industries. For schools, that may mean a total shift not only in how educators teach, but what they teach.
- One important strategy moving forward, thought leader Caroline Hill says, is to push back against the idea that getting ahead is more important than getting along. "The opportunity that education has in this moment to really push students and think about what is the right way to live, how do we do it and how do we do it in a way that doesn't hurt or rob the dignity of other people?"
- Hill also argues that now is the time for bigger swings and for removing the barriers that limit education. The online space is boundary free and provides educators with new opportunities to connect with students around the world.