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Climate change, warming oceans causing more rapid intensification in hurricanes

Climate change, warming oceans causing more rapid intensification in hurricanes

CBC
Thursday, August 31, 2023 6:59 AM GMT

Hurricane Idalia slammed into the area of Big Bend, Fla., early Wednesday morning as a Category 3 storm, bringing high winds, extreme storm surge and tornadoes to cities along the northern coast of the Gulf of Mexico.

But what was more surprising is that it took just over 24 hours for it to strengthen from a Category 1 hurricane to a Category 4, before it finally lost some steam as it ran into the Florida Panhandle.

Hurricanes get their fuel mainly from warm ocean waters, and as more greenhouse gases are released into the atmosphere from the burning of fossil fuels, both the Earth's temperature and the sea surface temperature (SST) rise.

Globally, SSTs have risen to 21 C, the warmest they've been on record, and that warming extends to the Gulf of Mexico, where Hurricane Idalia formed.

Recent research has suggested that the warming oceans are causing more intensification — ramping up the strength of hurricanes — as our climate warms.

"If you think of a tropical cyclone in general, it intensifies by extracting energy from the ocean," said Karthik Balaguru, a scientist for coastal modelling at Pacific Northwest National Laboratory in Seattle.

"So in a broader kind of perspective, if the oceans are warming up more and more as the climate changes, then they will provide a more favourable environment for the storms to intensify.".

Balaguru said the temperatures in the Gulf of Mexico are 1 C to 2 C warmer than normal.

"Usually, tropical storms, hurricanes, increase in intensity at a relatively steady rate," said Gabriel A. Vecchi, professor of geosciences at Princeton University in New Jersey.

"Sometimes they'll stay at a certain intensity. But every now and again, they'll undergo the process, which we call rapid intensification. And that is when a hurricane jumps the equivalent of one or so intensity classes in less than 24 hours."

That's exactly what happened with Hurricane Idalia.

Vecchi said although rapid intensification has occurred in roughly five per cent of hurricanes, that number is changing.

"The probability of it happening now is considerably more than five per cent," he said. "And it's it's been growing over the last 40 years. We see that increase, not just in the Atlantic Ocean. It's been sort of relatively throughout the tropics."

But it's not all about warmer ocean waters. The atmosphere — specifically wind shear — also plays a vital role in strengthening hurricanes. Wind shear is the change in wind speed as it rises into the atmosphere.

Read full story on CBC
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