When you often hear the ocean, you know the familiar sound of waves breaking on the beach, or white water churning up the sand. But what about a whistle. This kind of whistle is not heard by the human ear, for its tone and frequency is lower than the lowest key on the piano (the sub-contra-octave). Common in South America, Central America, and Caribbean Islands, the semi-enclosed basin of the Caribbean sea is the sound producer of this low-frequency whistle. The sound is created by a very slow-moving and low-amplitude wave pattern that runs on a 120 day cycle.
"In this case, the water is pulsing in and out of the Caribbean Sea. As the mass of water changes over time, we can detect that oscillating mass from the impact it has on Earth's gravity field," the study's lead author Chris Hughes, a researcher at the National Oceanography Centre in Liverpool, in the United Kingdom, told Live Science. I find this issue of my utmost importance, because the current of the ocean has a large influence on the Earth's climate. The whistle has the ability to suck the wave current energy out of the Caribbean Sea and deposit it into the Gulf. After it enters the Gulf, it blends with the current in the Gulf Stream. The effects of this could lead to major, catastrophic floods that are results of storms and rapid changes.
http://www.livescience.com/55174-weird-ocean-sound-heard-from-space.html
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