Scientists from Rutgers University-New Brunswick and Atmospheric and Environmental Research (AER) have linked the frequency of extreme winter weather in the United States to Arctic temperatures.

"Basically, this confirms the story I've been telling for a couple of years now," said study co-author Jennifer Francis, research professor of marine and coastal sciences in Rutgers' School of Environmental and Biological Sciences.

"Warm temperatures in the Arctic cause the jet stream to take these wild swings, and when it swings farther south, that causes cold air to reach farther south. These swings tend to hang around for awhile, so the weather we have in the eastern United States, whether it's cold or warm, tends to stay with us longer."

The research is timely given the extreme winter of 2017-2018, including record warm Arctic and low sea ice, record-breaking polar vortex disruption, record-breaking cold and disruptive snowfalls in the United States and Europe, severe "bomb cyclones" and costly nor'easters, said Judah Cohen, director of seasonal forecasting at AER and lead author of the study.

In their study, Cohen, Francis and AER's Karl Pfeiffer found that severe winter weather is two to four times more likely in the eastern United States when the Arctic is abnormally warm than when the Arctic is abnormally cold. Their findings also show that winters are colder in the northern latitudes of Europe and Asia when the Arctic is warm.

Paradoxically, the study shows that severe winter weather in the western United States is more likely when the Arctic is colder than normal.

The researchers found that when Arctic warming occurred near the surface, the connection to severe winter weather was weak. When the warming extended into the stratosphere, however, disruptions of the stratospheric polar vortex were likely. These disruptions usually cause severe winter weather in mid- to late winter and affect large metropolitan centers of the northeastern United States.

"Five of the past six winters have brought persistent cold to the eastern U.S. and warm, dry conditions to the West, while the Arctic has been off-the-charts warm," Francis said.

"Our study suggests that this is no coincidence. Exactly how much the Arctic contributed to the severity or persistence of the pattern is still hard to pin down, but it's becoming very difficult to believe they are unrelated."

Thus research was published in Nature Communications.

Related Links
Rutgers University
It's A White Out at TerraDaily.com

Tweet

Thanks for being here; We need your help. The Space Media Network continues to grow but revenues have never been harder to maintain. With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords. Our news coverage takes time and effort to publish 365 days a year. If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.
SpaceMediaNetwork Contributor $5 Billed Once credit card or paypal		SpaceMediaNetwork Monthly Supporter $5 Billed Monthly paypal only

Bulgaria's skiing boomtown sparks dire nature warnings
Bansko, Bulgaria (AFP) March 8, 2018
"Unlimited Ski and Fun!" promises a pamphlet touting the Bansko ski resort, a magnet for bargain-hunting holidaymakers in southwest Bulgaria. But nature lovers are demanding limits to the growth of the bustling resort carved into the majestic pine forests of Pirin National Park, a UNESCO World Heritage site since 1983. The clearance of more than 160 hectares (400 acres) of centuries-old forest to build the ski zone already prompted UNESCO in 2010 to remove the area from the World Heritage design ... read more