(Hurricae Ophelie / ESA https://bit.ly/3QuIeDh)
More mayhem.
Climatologists from the Colorado State University have recorded a gradual shift in the beginning of the hurricane season in the North Atlantic.
Since 1900, on average every ten years, the hurricane season starts five days earlier, and the hurricanes reach the coast two days earlier.
According to researchers led by Ryan Truchelut, this is due to the warming of the ocean surface. Figures.
Hurricanes and typhoons are tropical cyclones that form in seven basins. There they are observed every month, but large ones occur more often in summer.
They originate on both sides of the equator in the Intertropical Convergence Zone.
Within this low pressure zone, air is heated over the warm tropical ocean and rises, causing thunderstorms to form.
Downpours can form clusters of thunderstorms - this creates a stream of warm, moist air that quickly rushes up, and due to the rotation of the Earth, a cyclonic circulation occurs.
Since 1965, the season of hurricanes in the Atlantic Ocean basin has been considered the period from June to November.
During this period the most intense and destructive of hurricanes are formed.
Those hurricanes hit especially hard the Atlantic coast of the United States, the coast of the Gulf of Mexico, Mexico, Central America, the Caribbean and Bermuda.
However, the hurricane season does not have strictly fixed dates, and meteorologists have already noticed that they sometimes go beyond the generally accepted time frame
For example in 2012-2020, seven tropical cyclones developed before June 1.
THE RESEARCH
Now, Truchelut’s team analyzed data on Atlantic cyclones from 1900 to 2020.
The scientists used a historical database, reports from the National Hurricane Center, satellite observations, and modern climate datasets.
The analysis revealed a trend towards early onset of hurricane formation in the North Atlantic basin.
On average, the hurricane season started five days earlier every ten years.
And powerful hurricanes that reach the coast and make landfall start two days earlier every ten years.
Between April and May, the hurricane genesis potential index rises steadily.
(Ryan, et al / 2022 https://go.nature.com/3JZ0UIM)
Apparently, this trend is due to the fact that spring becomes a more favorable time of year for the formation of tropical cyclones ahead of time.
This is directly related to the rise in ocean temperatures in the North Atlantic.
The results of the study indicate that part of May should also be included in the hurricane season.
This is especially important for improving the warning and detection system for hurricanes.
Source:
- Nature Communication: https://www.nature.com/articles/s41467-022-31821-3
- The Verge: https://www.theverge.com/2022/8/16/23307081/atlantic-hurricane-season-storms-arrive-early
#science #technology #climate #hurricanes #ocean #news # #nftmc
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