The Caribbean Sea bellows so loudly it can be ‘heard’ from space.

But, the eerie A-flat it produces is far too low for human ears to detect.

In a recent study of the region, ocean scientists from the University of Liverpool discovered that the Caribbean behaves like a massive whistle, through an unusual oscillations in the Earth’s gravity field.

Scroll down to hear the bizarre sounds of the Caribbean Sea

The Caribbean Sea is bellowing so loudly it can be ‘heard’ from space. But, the eerie A-flat it produces is far too low for human ears to detect. Pictured above, the Caribbean can be seen from the International Space Station

THE MASSIVE SEA WHISTLE The ‘Rossby whistle’ occurs as the result of interactions between the large, westward Rossby wave and the seafloor. During this interaction, water pours in and out of the basin every 120 days, and the dramatic change in mass alters the Earth’s gravity field. When an ocean current flows through the Caribbean Sea, it becomes unstable. This excites the resonance of the 'Rossby wave,' which can be 'heard' using gravity measurements. Advertisement

The Caribbean Sea sits southeast of the Gulf of Mexico, and is part of the Atlantic Ocean.

While analyzing activity in the region between 1958 and 2013, the researchers noticed a strange phenomenon.

They examined sea levels and pressure readings from the bottom of the Sea, along with tide gauges and satellite measurements of gravity, and found that the area is producing what they’ve dubbed a ‘Rossby whistle.’

This happen when a large wave flowing slowly to the west, a Rossby wave, interacts with the seafloor.

When the wave reaches the western boundary it dies out, but reappears on the eastern side of the basin.

Scientists describe this as the ‘Rossby wormhole.’

Such a process can only be survived by waves of particular length, or they will otherwise cancel themselves out.

Rossby waves, however, reinforce themselves, and produce an oscillation with a distinct period.

During this interaction, water pours in and out of the basin every 120 days, and the dramatic change in mass alters the Earth’s gravity field.

These fluctuations can be detected by satellites.

The Caribbean Sea ‘whistle’ lets out an A-flat that is many octaves below the audible range. Researchers have altered the pitch of the strange hum so it can be heard by human ears

As a result of the 120 day period, the Caribbean Sea ‘whistle’ lets out an A-flat that is many octaves below the audible range.

‘We can compare the ocean activity in the Caribbean Sea to that of a whistle,’ said Professor Chris Hughes, an expert in Sea Level Science at the University.

‘When you blow into a whistle, the jet of air becomes unstable and excites the resonant sound wave which fits into the whistle cavity. Because the whistle is open, the sound radiates out so you can hear it.

‘Similarly, an ocean current flowing through the Caribbean Sea becomes unstable and excites a resonance of a rather strange kind of ocean wave called a 'Rossby wave'.

The researchers examined sea levels and pressure readings from the bottom of the Sea, along with tide gauges and satellite measurements of gravity, and found that the area is producing what they’ve dubbed a ‘Rossby Whistle’

This happen when a large wave flowing slowly to the west, a Rossby wave, interacts with the seafloor. When the wave reaches the western boundary it dies out, but reappears on the eastern side of the basin, causing scientists to describe this as the ‘Rossby wormhole’

‘Because the Caribbean Sea is partly open, this causes an exchange of water with the rest of the ocean which allows us to 'hear' the resonance using gravity measurements."

Researchers say the Rossby whistle could have an effect on sea levels, and in turn increase the probability of flood losses.

In particular, this may have implications for Barranquilla in Colombia, where flood loses increase dramatically with just 20 cm of sea level rise.

‘This phenomenon can vary sea level by as much as 10 cm along the Colombian and Venezuelan coast, so understanding it can help predict the likelihood of coastal flooding,’ Hughes said.

Along with this, the researchers suspect the Rossby whistle may affect the entire North Atlantic, due to its role in regulating the flow in the Caribbean Current.