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When The Weather Is Extreme, Is Climate Change To Blame?

When The Weather Is Extreme, Is Climate Change To Blame?

July 29, 2018
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When The Weather Is Extreme, Is Climate Change To Blame?

July 29, 2018
in Climate, Environment, Featured, News
0
Home Environment Climate
Post Views: 346

 
Dramatic weather events happened this past week in many parts of the Northern Hemisphere. There were wildfires in Greece, Scandinavia, and the Western U.S. Flooding followed record rainfalls in the Northeast. And dangerous heat waves settled over the Southwest, Japan, and the U.K.

If it continues like this, 2018 could end up being one of the hottest years on record.

When the news is full of stories on extreme weather, it’s hard not to wonder: Is this what climate change looks like?

Climate scientists say yes — though it’s complicated.

Take wildfires, for example.

“We see five times more large fires today than we did in the 1970s,” says Jennifer Balch, professor in geography and director of Earth Lab at the University of Colorado Boulder.

Wildfires are part of the ecosystem of the American West, and scientists expect a certain number of them under normal average conditions. But what global warming does, says Balch, is change the backdrop against which they happen.

“Fire season is about three months longer than it was just a few decades ago,” she says. “We’ve seen a 2-degree Fahrenheit increase across the Western U.S. Snowpack is melting earlier, and what that’s doing is essentially opening up the window for fires to happen over a much longer period of time.”

Last year was the costliest fire season ever, with damages exceeding $18 billion dollars.

Overall, weather and climate disasters in the U.S. caused more than $300 billion in damages in 2017, shattering previous records. Though that’s not all climate — those increased costs are partly the result of development and sprawl.

Andreas Prein is a research scientist at the National Center for Atmospheric Research in Boulder, Colorado. He studies how extreme weather — especially thunderstorms and heavy downpours — might change in the future.

“What we see from climate change is that you lose a lot of these very moderate and light rainfall storms and replace it with very intense storms,” he says. Over the last 50 years, the number of really big rainstorms has increased by as much as 70 percent.

Scientists are just beginning to put numbers on the effect climate change is having on individual storms.

“They pick an extreme event — let’s say, Hurricane Harvey from last year — and they try to run the event without human greenhouse gas emissions,” Prein says. “And then they add the human component … to the atmosphere and basically compare those two realizations of the world with each other. So you can try to get a feeling for how we altered specific extreme events or the likelihood and intensity of an extreme event.”

Some aspects of climate change are pretty certain, he says. Temperatures are rising. Rainstorms and heat waves are getting more intense. These are the long-predicted results of increased greenhouse gas emissions.

To a certain degree, that we’ve had so much extreme weather this past week is a coincidence: fires, heat waves, and rainstorms happen every summer.

But climate change makes this kind of extreme weather more common, researchers say – and it’s a trend that’s expected to continue as the planet keeps getting warmer.

Source :

WKAR

Tags: climate changeExtreme climateExtreme WeatherNorthern Hemisphereweather
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