(CNN) — It is becoming increasingly evident that hurricanes, typhoons, and tropical cyclones worldwide are becoming stronger and potentially more deadly as the globe warms due to the climate crisis, according to a new study.
The study, released on Monday by researchers at the University of Wisconsin in Madison and the National Oceanic and Atmospheric Administration (NOAA), looked at nearly 40 years of satellite data of global storms.
Researchers found that the probability of storms reaching major hurricane status (category 3 or above on the Saffir-Simpson scale with winds in excess of 110 mph or higher), increased decade after decade.
“The change is about 8% per decade,” Jim Kossin, author of the study, told CNN. “In other words, during its lifetime, a hurricane is 8% more likely to be a major hurricane in this decade compared to the last decade.”
The new research builds upon previous studies that showed a likely increase in stronger storms as global oceans had warmed, but the data did not go back far enough to confidently asses the increase was due to man-made global warming and not natural cycles that can span decades. The latest findings add another 11 years to the data set, which allows for statistically significant trends to become clear.
“The signals really start to emerge beyond the internal climate variability noise when you look at (approximately) 40 years of data as opposed to their earlier study which looked at (approximately) 25 years of data,” Colorado State University hurricane researcher Phil Klotzbach, who was not involved in this study, told CNN in an email interview.
Kossin and his team’s research spanned the globe, showing that storms across the world are becoming stronger and thus more destructive, as the higher-end of the scale storms produce a disproportionate amount of damage and deaths.
“Almost all of the damage and mortality caused by hurricanes is done by major hurricanes (category 3 to 5),” Kossin said. “Increasing the likelihood of having a major hurricane will certainly increase this risk.”
The study reveals that global warming has increased sea surface temperature in regions where tropical cyclones form. The combination of these warm temperatures along with changes in atmospheric conditions, have allowed storms to more easily reach higher intensities.
Super Cyclone Amphan strengthens to new record
A current example of what the study says is happening more frequently can be found in the Bay of Bengal, where Super Cyclone Amphan has reached the top of the scale with winds equivalent to a category 5 hurricane on the Saffir-Simpson Scale.
The storm reached sustained winds of 270 kph (165 mph) on Monday, making it the strongest storm on record in the Bay of Bengal, according to data from the US Joint Typhoon Warning Center.
“Sea surface temperatures are much warmer than normal in the Bay of Bengal right now,” Klotzbach said. Warmer ocean temperatures are one of the main ingredients the new study pointed to in explaining the observed increase in storm strength.
Interestingly, this was one of the few locations on Earth where the authors did not see increased storm intensity.
“The trend we found is not very prominent in the Northern Indian Ocean, but that’s mostly because the data are so sparse there and it’s difficult for trends to be identified above all the noise,” Kossin said.
“I suspect if they extended the study to include 2018 and 2019, it would become significant,” Klotzbach said. “Last year was absolutely crazy in the North Indian Ocean, especially in the Arabian Sea.”
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