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  2. Underwater acoustics - Wikipedia

    en.wikipedia.org/wiki/Underwater_acoustics

    Distant ship traffic is one of the dominant noise sources [28] in most areas for frequencies of around 100 Hz, while wind-induced surface noise is the main source between 1 kHz and 30 kHz. At very high frequencies, above 100 kHz, thermal noise of water molecules begins to dominate. The thermal noise spectral level at 100 kHz is 25 dB re 1 μPa ...

  3. SOFAR channel - Wikipedia

    en.wikipedia.org/wiki/SOFAR_channel

    The ocean conducts sound very efficiently, particularly sound at low frequencies, i.e., less than a few hundred Hz. Temperature is the dominant factor in determining the speed of sound in the ocean. In areas of higher temperatures (e.g. near the ocean surface), there is higher sound speed.

  4. Sound speed profile - Wikipedia

    en.wikipedia.org/wiki/Sound_speed_profile

    Figure 1. Table 1's data in graphical format. Although given as a function of depth [note 1], the speed of sound in the ocean does not depend solely on depth.Rather, for a given depth, the speed of sound depends on the temperature at that depth, the depth itself, and the salinity at that depth, in that order.

  5. The noisy ocean: Humans have made the world's seas a very ...

    www.aol.com/news/noisy-ocean-humans-made-worlds...

    The ocean has become a raucous cacophony as the noise from human activity has grown louder and more prevalent, according to a study. The noisy ocean: Humans have made the world's seas a very loud ...

  6. Douglas sea scale - Wikipedia

    en.wikipedia.org/wiki/Douglas_sea_scale

    The Douglas sea scale is a scale which measures the height of the waves and also measures the swell of the sea. The scale is very simple to follow and is expressed in one of 10 degrees. The scale is very simple to follow and is expressed in one of 10 degrees.

  7. Ocean acoustic tomography - Wikipedia

    en.wikipedia.org/wiki/Ocean_acoustic_tomography

    The western North Atlantic showing the locations of two experiments that employed ocean acoustic tomography. AMODE, the "Acoustic Mid-Ocean Dynamics Experiment" (1990-1), was designed to study ocean dynamics in an area away from the Gulf Stream, and SYNOP (1988-9) was designed to synoptically measure aspects of the Gulf Stream.

  8. How humanity's ear-splitting racket deafens whales and other ...

    www.aol.com/news/humanitys-ear-splitting-racket...

    Industrial activity has added up to 15 decibels of noise to the Santa Barbara Channel, new research has found. Hear the difference. How humanity's ear-splitting racket deafens whales and other ...

  9. List of unexplained sounds - Wikipedia

    en.wikipedia.org/wiki/List_of_unexplained_sounds

    The Train is the name given to a sound recorded on March 5, 1997, on the Equatorial Pacific Ocean autonomous hydrophone array. The sound rises to a quasi-steady frequency. According to the NOAA, the origin of the sound is most likely generated by a very large iceberg grounded in the Ross Sea, near Cape Adare. [10