|COMPUTER MODEL OF POLAR VORTEX|
Indeed, recent temperatures across the U.S. have been Mars-like. Forecasts in the midwest call for temperatures to drop to 32 below zero in Fargo, N.D.; minus 21 in Madison, Wis.; and 15 below zero in Minneapolis, Indianapolis and Chicago. Wind chills have been predicted to fall to negative 60 degrees — a dangerous cold that could break decades-old records.
All of which begs the question — if climate change is real, then how did it get so cold?
The question is based on common misconceptions of how cold weather moves across the planet, said Greg Laden, a bioanthroplogist who writes for National Geographic’s Scienceblog. According to Laden, the recent record-cold temperatures indicate to many that the Arctic’s cold air is expanding, engulfing other countries. If true, this would be a perfect argument for a “global cooling” theory. The Arctic’s coldness is growing. Laden asks, “How can such a thing happen with global warming?”
|1989 POLAR VORTEX|
The answer, he writes, is that the Arctic air that usually sits on top of our planet is “taking an excursion” south for a couple of days, leaving the North Pole “relatively warm” and our temperate region not-so-temperate. “Go Home Arctic, You’re Drunk,” he titled the explanation.
“The Polar Vortex, a huge system of moving swirling air that normally contains the polar cold air, has shifted so it is not sitting right on the pole as it usually does,” Laden writes. “We are not seeing an expansion of cold, an ice age, or an anti-global warming phenomenon. We are seeing the usual cold polar air taking an excursion. So, this cold weather we are having does not disprove global warming.”
In fact, some scientists have theorized that the influx of extreme cold is actually fueled by effects of climate change. Jennifer Francis, a research professor at Rutgers University’s Institute of Marine and Coastal Science said today that it’s not the Arctic who is drunk. It’s the jet stream.
Arctic warming, she said, is causing less drastic changes in temperatures between northern and southern climates, leading to weakened west-to-east winds, and ultimately, a wavier jet stream. The stream’s recent “waviness” has been taking coldness down to the temperate United States and leaving Alaska and the Arctic relatively warm, Francis said. The same thing has been happening in other countries as well. Winter storms have been pounding the U.K., she noted, while Scandinavia is having a very warm winter.
“This kind of pattern is going to be more likely, and has been more likely,” she said. “Extremes on both ends are a symptom. Wild, unusual temperatures of both sides, both warmer and colder.”Dr. Kevin E. Trenberth, a distinguished senior climate scientist at the National Center for Atmospheric Research said: "The answer to the oft-asked question of whether an event is caused by climate change is that it is the wrong question, All weather events are affected by climate change because the environment in which they occur is warmer and moister than it used to be."
So sorry GOP science deniers, this influx of cold weather is not your debunking trump card to the reality of climate change.