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."
Arctic Monitoring and Assessment Programme/https://amap.no
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.
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."
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- Center for the study of Hate and Extremism has found preliminary evidence that political discourse is tied to hate crimes.
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- Video games are often dismissed as fun distractions, but some of them dive into deep issues.
- Through their interactive play elements, these games approach big issues intelligently and leave you both entertained and enlightened.
- These five games are certainly not the only games that cover these topics or do so well, but are a great starting point for somebody who wants to play something thought provoking.
The Amazon Rainforest is often called "the planet's lungs."
- For weeks, fires have been burning in the Amazon rainforest in Brazil, likely started by farmers and ranchers.
- Brazil's president, Jair Bolsonaro, has blamed NGOs for starting the flames, offering no evidence to support the claim.
- There are small steps you can take to help curb deforestation in the Amazon rainforest, which produces about 20 percent of the world's oxygen.