Arctic’s Temperature Continues To Run Hot, Latest ‘Report Card’ Shows … December 12, 2017 … NPR

melt_ponds_floes1_custom-6f92f61dd0b438088dab15f3600c6cb8bafcdf6f-s800-c85.jpg

Melt ponds dot a stretch of sea ice in the Arctic Ocean, north of Greenland. This year was the Arctic’s second-warmest in at least 1,500 years, after 2016.

Nathan Kurtz/NASA

 

The Arctic is a huge, icy cap on the planet that acts like a global air conditioner. But the air conditioner is breaking down, according to scientists who issued a grim “report card” on the Arctic on Tuesday.

They say the North Pole continues to warm at an alarming pace — twice the rate as the rest of the planet, on average. This year was the Arctic’s second-warmest in at least 1,500 years, after 2016.

Researchers say there was less winter ice in the Arctic Ocean than ever observed. And ocean water in parts of the polar Barents and Chukchi seas was a whopping 7 degrees Fahrenheit higher than just a few decades ago.

It’s a trend that has some calling the state of the Arctic a “new normal.” But Arctic scientist Jeremy Mathis says that term doesn’t work for him.

“There is no normal,” he says. “That’s what so strange about what’s happening in the Arctic. … The environment is changing so quickly in such a short amount of time that we can’t quite get a handle on what this new state is going to look like.”

Mathis runs the Arctic program at the National Oceanic and Atmospheric Administration. He says changes in the Arctic are going to affect everybody in the Northern Hemisphere.

That is because masses of air and ocean currents circulate between a cold Arctic and the warmer parts of the Northern Hemisphere. It’s sort of like a conveyor belt that is driven largely by the temperature difference, or gradient, between the two regions.

With less snow and ice to reflect the sun’s rays, the Arctic isn’t so cool anymore. “The heat is not being reflected back into space,” Mathis says. “The heat is now being absorbed into the land and into the [polar] ocean.”

And he says that is going to alter the weather — things like the jet stream and rainstorms and hurricanes. “Whether they be wildfires out in California or hurricanes down in the Gulf,” Mathis says, “we have to think about the impacts that changes in the Arctic are having on those disruptive climate events.”

Scientists say they can’t attribute any particular drought or hurricane to changes in the Arctic. But computer simulations show changes.

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