Posted by: maboulette | November 18, 2016

The North Pole Is an Insane 36 Degrees Warmer Than Normal


polarnight

Political people in the United States are watching the chaos in Washington at the moment. But there are those involved in the world of science people in the science community are watching the chaos somewhere else — the Arctic.

NIGHT

It’s polar night in the Arctic there — the sun isn’t rising in much of this area. That’s when the Arctic is supposed to get super-cold, when the sea ice covering the vast Arctic Ocean is supposed to grow and get thicker.

STRANGE YEAR

But in fall of 2016 — which has been an unconventional year for this region, with multiple records set for low levels of monthly sea ice — something is totally off. The Arctic is actually super-hot, even as a vast area of cold polar air has been displaced over Siberia.

INDICATOR

At the same time, a key indicators of the state of the Arctic — the extent of sea ice covering the polar ocean — is at a record low. The ice is freezing up again, as it always does this time of year after reaching its low in September, but it isn’t doing this as rapidly as usual.

In fact, the ice’s area is even lower than it was during the record-low 2012:

chart-artic

Twitter’s expert Arctic watchers also are stunned. Zack Labe, a PhD student at the University of California at Irvine who studies the Arctic, tweeted out an image on Wednesday from the Danish Meteorological Institute showing Arctic temperatures about 20 degrees Celsius higher than normal above 80 degrees North Latitude.

“Today’s latest #Arctic mean temperature continues to move the wrong direction . . . up. Quite an anomalous spike!,” Labe wrote. Here’s the figure:

artic-area-2

“Despite onset of #PolarNight, temperatures near #NorthPole increasing. Extraordinary situation right now in #Arctic, w/record low #seaice,” added Daniel Swain, a climate scientist at UCLA.

FREAKISHLY WARM

This is the second year in a row that temperatures around the North Pole have risen to levels that are freakishly warm. During 2015’s final days, the temperature near the Pole actually spiked to the melting point thanks to a massive storm that propelled warm air into the region.

SO WHAT’S GOING ON HERE?

“It’s about 20C [36 degrees Fahrenheit] warmer than normal over most of the Arctic Ocean, along with cold abnormalities of about the same magnitude over north-central Asia,” Jennifer Francis, an Arctic specialist at Rutgers University, said by email Wednesday.

WARMTH

“The Arctic warmth is the result of a combination of record-low sea-ice extent for this time of year, probably very thin ice, and plenty of warm/moist air from lower latitudes being driven northward by a very wavy jet stream.”

RESEARCH

Francis has published research signifying that the jet stream, which travels from west to east across the Northern Hemisphere in the mid-latitudes, is becoming more wavy and elongated as the Arctic warms faster than the equator does.

WEAK POLAR VORTEX

“It will be fascinating to see if the stratospheric polar vortex continues to be as weak as it is now, which favors a negative Arctic oscillation and probably a cold mid/late winter to continue over eastern and central Asia and eastern North America. The extreme behavior of the Arctic in 2016 seems to be in no hurry to quit,” Francis continued.

JUDAH COHEN

Francis cited the work of Judah Cohen, a forecaster with Atmospheric and Environmental Research, who has linked the odd jet stream behavior with cold air over Siberia. 

JAMES OVERLAND

Indeed, another Arctic expert, James Overland with the National Oceanic and Atmospheric Administration, said that the jet stream at the moment is well shaped to transport warmth northward into the Arctic. “There is strong warm advection into the Arctic, especially northern-central Canada, in through the Atlantic, and east Siberian/Chukchi Sea,” Overland said.

Most experts agreed that this entire situation is pretty extreme.

“Both the persistence and magnitude of these temperature anomalies are quite unusual,” Labe added by email. “Large variability in temperatures is common in the Arctic (especially during the cold season), but the duration of this warm Arctic — cold Siberia pattern is unusual and quite an impressive crysophere/sea ice feedback.” (The “cryosphere” refers to that part of the Earth’s system that is made up of ice.)

SINCE OCTOBER

Abnormally warm air has flooded the Arctic since October. Richard James, a meteorologist who pens a blog on Alaska weather, analyzed 19 weather stations surrounding the Arctic Ocean and found that the average temperature was about 4 degrees (2 Celsius) above the record set in 1998.

HIGHER

Since November, temperatures have risen even higher. “It is amazing to see that the warmth has become even more pronounced since the end of October,” James wrote on his blog.

NATIONAL SNOW AND ICE DATA CENTER

Mark Serreze, who heads the National Snow and Ice Data Center in Boulder, Colo., agrees that there is something odd going on. Not only are air temperatures unusually warm, but water temperatures are as well.  “There are some areas in the Arctic Ocean that are as much as 25 degrees Fahrenheit above average now,” Serreze said. “It’s pretty crazy.”

UNDERLYING OCEAN

What’s happening, he explains, is sort of a “double whammy.” On the one hand, there is a “very warm underlying ocean” due to the lack of sea ice forming above it. But, at the same time, kinks in the jet stream have allowed warm air to flow northward and frigid Arctic air to descend over Siberia.

SEA ICE

“The sea ice is at a record low right now, for this time of year, that’s one thing,” Serreze said. “And why it’s so low — again, there’s so much heat in the upper ocean in these ice-free areas, the ice just can’t form right now. The ocean’s just got to get rid of this heat somehow, and it’s having a hard time doing so.”

 

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