4 edition of Sound transmission through a fluctuating ocean found in the catalog.
Bibliography: p. -283.Includes index.
|Statement||Cambridge University Press|
|Publishers||Cambridge University Press|
|The Physical Object|
|Pagination||xvi, 139 p. :|
|Number of Pages||87|
|2||Cambridge monographs on mechanics and applied mathematics|
nodata File Size: 7MB.
Because frequency and wavelength are inversely proportional characteristics of sound waves, low-frequency signals produce long sound wavelengths. However, at a depth of approximately 750 meters 2,460 feetthe variations in temperature become so slight that the water becomes essentially isothermal of uniform temperature.
Surface temperature variation can be significant with seasonal variations in the amount of sunlight insolation that can produce changes in near-surface temperatures that, in turn, affect the speed of sound in water near the ocean surface. Accordingly, waves traveling upward toward the surface, where the speed of sound increases with increasing temperature, deflect downward.
Such isothermal layers are common in mid-latitude regions. The SOFAR Channel A temperature gradient exists when the temperature of the water decreases with increasing depth. You are using a browser version with limited support for CSS. In contrast, in salt water at approximately the same temperature, the speed of sound is approximately 1,524 meters 5,000 feet per second.
This sound fixing and ranging SOFAR channel was discovered in 1943 by an American team led by Maurice Ewing and J. The crew of Le Suroit prepare to launch deep-sea sonar in 1985 during a search for the wreck of the Titanic. Conversely, at shallower depths, temperature plays the most dominant role in governing the speed of sound.
The resulting thermocline shows a characteristic decrease in the speed of sound with decreasing temperature. The state properties of water temperature and pressure and the degree of salinity also affect the speed of sound. A specific set of conditions, however, also act to create a channel through which sound waves propagate at minimal speed but with minimal loss of strength. Thank you for visiting nature.