HomeTechnologyStudy finds climate change added 10% to Ian's rainfall

Study finds climate change added 10% to Ian’s rainfall


By SETH BORENSTEIN, AP Science Writer

Climate change added at least 10% more rain to Hurricane Ian, a study prepared in the immediate aftermath of the storm shows.

Thursday’s research, which is not peer-reviewed, compared peak rainfall rates during the actual storm to about 20 different computer scenarios from a model with the characteristics of Hurricane Ian slamming into the Sunshine State in a world without human-caused climate change.

“The actual storm was 10% wetter than the storm it might have been,” said Michael Wehner, a climate scientist at Lawrence Berkeley National Laboratory, who co-authored the study.

Forecasters predicted that Ian will have dropped up to two feet (61 centimeters) of rain in parts of Florida by the time it stops.

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Wehner and Kevin Reed, an atmospheric scientist at Stony Brook University, published a study in Nature Communications earlier this year on 2020 hurricanes and found that during their wettest three-hour periods they were more than 10% wetter than hurricanes. in a world without a greenhouse. gases that trap heat. Wehner and Reed applied the same scientifically accepted attribution technique to Hurricane Ian.

An old rule of physics is that for every additional degree Celsius (1.8 degrees Fahrenheit) of heat, the air in the atmosphere can contain 7% more water. This week the Gulf of Mexico was 0.8 degrees warmer than normal, which should have meant 5% more rain. The reality turned out to be even worse. The flash study found that the hurricane dropped twice as much: 10% more rain.

Ten percent may not sound like much, but 10% of 20 inches is two inches, which is a lot of rain, especially on top of the 20 inches that have already fallen, Reed said.

Other studies have seen the same feedback mechanisms of stronger storms in warmer climates, said Princeton University atmospheric scientist Gabriel Vecchi, who was not part of the study.

MIT hurricane researcher Kerry Emanuel said that, in general, a warmer world makes storms wetter. But he said he is uncomfortable drawing conclusions about individual storms.

“This business on top of very, very heavy rains is something we expected to see because of climate change,” he said. “We will see more storms like Ian.”

Princeton’s Vecchi said in an email that if the world is going to recover from disasters, “we need to plan for wetter storms in the future, as global warming is not going to go away.”

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Follow Seth Borenstein on Twitter at @borenbears

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