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More hurricanes may hit New York and Boston in 21st century

Justin Rowell by Justin Rowell
29.09.2022
Home Science

A delivery person rides a motorbike through flooded streets in New York City

The 21st century will see an expansion of hurricanes and typhoons into mid-latitude regions, which include major cities such as New York, Boston, Beijing, and Tokyo, a new study suggests.

Tropical cyclones—hurricanes and typhoons—could migrate northward and southward in their respective hemispheres, as the planet warms as a result of anthropogenic greenhouse gas emissions, the researchers say.

2020’s subtropical storm Alpha, the first tropical cyclone observed making landfall in Portugal, and this year’s Hurricane Henri, which made landfall in Connecticut, may be harbingers of such storms.

“This represents an important, under-estimated risk of climate change,” says first author Joshua Studholme, a physicist in Yale University’s earth and planetary sciences department and a contributing author on the United Nations’ Intergovernmental Panel on Climate Change sixth assessment report published earlier this year.

“This research predicts that the 21st century’s tropical cyclones will likely occur over a wider range of latitudes than has been the case on Earth for the last 3 million years,” Studholme says.

While an increase in tropical cyclones is commonly cited as a harbinger of climate change, much remains unclear about how sensitive they are to the planet’s average temperature.

In the 1980s, study coauthor Kerry Emanuel of the Massachusetts Institute of Technology, used concepts from classical thermodynamics to predict that global warming would result in more intense storms—a prediction that has been validated in the observational record.

Yet other aspects of the relationship between tropical cyclones and climate still lack physically based theory. For example, there is no agreement among scientists about whether the total number of storms will increase or decrease as the climate warms, or why the planet experiences roughly 90 such events each year.

“There are large uncertainties in how tropical cyclones will change in the future,” says Alexey Fedorov, a professor of oceanic and atmospheric sciences at Yale. “However, multiple lines of evidence indicate that we could see more tropical cyclones in mid-latitudes, even if the total frequency of tropical cyclones does not increase, which is still actively debated.

“Compounded by the expected increase in average tropical cyclone intensity, this finding implies higher risks due to tropical cyclones in Earth’s warming climate.”

Typically, tropical cyclones form at low latitudes that have access to warm waters from tropical oceans and away from the shearing impact of the jet streams—the west-to-east bands of wind that circle the planet. Earth’s rotation causes clusters of thunderstorms to aggregate and spin up to form the vortices that become tropical cyclones. Other mechanisms of hurricane formation also exist.

As the climate warms, temperature differences between the Equator and the poles will decrease, the researchers say. In summer months, this may cause weakening or even a split in the jet stream, opening a window in the mid-latitudes for tropical cyclones to form and intensify.

For the study, Studholme, Fedorov, and colleagues analyzed numerical simulations of warm climates from Earth’s distant past, recent satellite observations, and a variety of weather and climate projections, as well as the fundamental physics governing atmospheric convection and planetary-scale winds.

For example, they noted that simulations of warmer climates during the Eocene (56 to 34 million years ago) and Pliocene (5.3 to 2.6 million years ago) epochs saw tropical cyclones form and intensify at higher latitudes.

“The core problem when making future hurricane predictions is that models used for climate projections do not have sufficient resolution to simulate realistic tropical cyclones,” says Studholme, a postdoctoral fellow at Yale.

“Instead, several different, indirect approaches are typically used. However, those methods seem to distort the underlying physics of how tropical cyclones form and develop. A number of these methods also provide predictions that contradict each other.”

The new study derives its conclusions by examining connections between hurricane physics on scales too small to be represented in current climate models and the better-simulated dynamics of Earth’s jet streams and north-south air circulation, known as the Hadley cells.

The study appears in Nature Geoscience. Additional coauthors are from the Shirshov Institute of Oceanology and the University of Reading.

NASA, the National Oceanic and Atmospheric Administration, and the ARCHANGE project supported the work.

Source: Yale University

The post More hurricanes may hit New York and Boston in 21st century appeared first on Technovanguard.


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