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  2. Underwater acoustics - Wikipedia

    en.wikipedia.org/wiki/Underwater_acoustics

    Typical noise spectrum levels decrease with increasing frequency from about 140 dB re 1 μPa 2 /Hz at 1 Hz to about 30 dB re 1 μPa 2 /Hz at 100 kHz. 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.

  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. Sea state - Wikipedia

    en.wikipedia.org/wiki/Sea_state

    Sea State 5 and 8 range. In oceanography, sea state is the general condition of the free surface on a large body of water—with respect to wind waves and swell—at a certain location and moment. A sea state is characterized by statistics, including the wave height, period, and spectrum. The sea state varies with time, as the wind and swell ...

  5. 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.

  6. 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.

  7. Sound (geography) - Wikipedia

    en.wikipedia.org/wiki/Sound_(geography)

    In geography, a sound is a smaller body of water usually connected to a sea or an ocean. A sound may be an inlet that is deeper than a bight and wider than a fjord; or a narrow sea channel or an ocean channel between two land masses, such as a strait; or also a lagoon between a barrier island and the mainland. [1] [2]

  8. AOL Mail

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  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