Scientists find a strong link between high temperatures near the pole and remarkably heavy snowfall and frigid weather farther south.
The sort of severe wintertime weather that has rattled parts of the US and UK is becoming more common as the Arctic warms, with scientists detecting a strong link between high temperatures near the pole and remarkably heavy snowfall and frigid weather farther south.
A sharp increase in temperatures across the Arctic since the early 1990 s has coincided with an uptick in abnormally cold snaps in wintertime, especially in the eastern US, according to new research that analyzed temperature data regarding 1950 onwards.
Extreme cold wintertime weather is up to four times more likely when temperatures in the Arctic are unusually high, such studies saw. Researchers compared daily temperatures from across the Arctic region with something “ve called the” accumulated winter season severity indicator, which grades wintertime weather based on temperature, snow fall and snow depth, across 12 US cities.
” There’s a remarkably strong correlation between a warm Arctic and cold winter climate further south ,” told Judah Cohen, a climatologist at Atmospheric and Environmental Research.” It’s a complex narrative- global warming is contributing to milder temperatures but is also having unforeseen outcomes such as this .”
The Arctic has just experienced its toastiest winter on record, with parts of the region 20 C( 68 F) warmer than the long-term median, a situation scientists have variously described as “crazy,” ” weird ,” and” simply shocking “. The far north latitudes are warming around twice as quickly as the global average, decreasing glaciers and sea ice and imperiling beasts such as polar bears.
Two large wintertime blizzards lately swept the US east coast in less than a week, unloading up to three inches of snow per hour in places, resulting in several deaths, thousands of cancelled flights, closed schools and snarled traffic.
The cold front even reached Florida, contributing to a recent surge in manatee demises. So far this year, 166 of the marine mammals have been found dead off the state’s coast, with stress from the cold the leading cause of mortality.” Manatees may join polar bears as one of the first iconic victims of extinction in the wild from climate change ,” told Jeff Ruch, executive director of Public Employees for Environmental Responsibility.
The US cyclones follow freezing gales from Siberia- dubbed the’ beast from the east‘- that battered parts of Europe, with the British army deployed to help liberate hundreds of stranded drivers on UK motorways.
” This wintertime is a great instance of what we can expect from climate change ,” said Cohen.” In the US we had the’ bomb tornado’ in January, followed by July-like warm weather in February that I’d ever seen before. And now we’ve had a procession of powerful wintertime blizzards and the animal from the east. It’s mind boggling .”
The research didn’t look at the reasons behind the trend of see-sawing temperatures between the Arctic and areas to the south but Cohen said it was consistent with the hypothesi that the polar vortex- which shot to public consciousness during a 2014 cold spell- is being disrupted as the earth heats up.
The polar vortex is a low pressure system that swirls around the polar region. Sometimes it can stray further south, bringing cold Arctic air with it. There is continuing speculation over potential impacts climate change is having but some scientists believe warming temperatures could be weakening the polar vortex’s flowing, allowing it to meander towards the equator.
This nuanced picture of the consequences of climate change has been derided by Donald Trump, with the president use Twitter to mockingly reference cold weather during almost every winter in recent years. In December, Trump tweeted that” perhaps we could use a little bit of that good old Global Warming” amid plunging temperatures.
Scientists say this stance overlooks the complicated changes underway in the environment as the world warms due to human activity, by an average of around 1C over the past century. This temperature rise hasn’t been uniform across the globe and has fueled an array of conditions, from increased deluge risk in some areas to drought conditions and heatwaves in others.
Richard Alley, a resulting glacier and climate expert at Penn State who was not involved in Cohen’s research, said the study is “fascinating” and “important” but added the discrepancy between Arctic temperatures and wintertime weather elsewhere could have other drivers, such as a warm Gulf of Mexico feeding extra energy into cyclones along the US east coast.
” The broadest image is that we are indeed warming the world’s climate, mainly from carbon dioxide emissions release from fossil-fuel burning, and this will impact us and other living things ,” said Alley.
The Arctic’s role is ensure quite differently by some other scientists, however, who point out that occasional outbursts of cold weather haven’t altered the trend that winters in the US northeast have been getting warmer, especially since the 1970 s.
” There have always been cold outbreaks. The cold air has to go somewhere ,” said Kevin Trenberth, senior scientist at the National Center for Atmospheric Research.
” The questions is whether the air bides put or gets loose. Some years it is contained, other years it breaks out. The question is where and what is the cause. This study reaffirms the relationship but not its cause. The Arctic likely plays a modest role in terms of feedbacks but it is unlikely it is a cause .”
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