Data collected by thousands of scientific instruments scattered across the world’s oceans show that weak tropical cyclones are intensifying, not just stronger ones
Hurricanes are expected to grow stronger as the climate warms, with more of them spinning up into major storms. But it’s not just the biggest cyclones that are worsening. New research finds that weak tropical cyclones, including tropical storms and low-category hurricanes, are intensifying over time.
It’s among the first studies to use direct ocean measurements, rather than satellite data, to track changes in the intensity of tropical cyclones over time. Scientists often rely on aircraft missions to collect up-close information about a hurricane’s wind speed and other physical characteristics. But it’s not possible to gather that kind of data for every individual cyclone that forms around the world.Still, some previous studies have attempted it—and there are some indications that tropical cyclones are getting stronger over time.
The new study adds a line of direct evidence that tropical cyclones are getting stronger. The ocean measurements suggest that tropical cyclones are likely intensifying at a rate of around 1.8 meters per second each decade. The study suggests that this strengthening trend holds true for storms all over the world.
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