| 单词 | sound channel |
| 释义 | > as lemmassound channel sound channel n. Oceanography a layer of water in which sound is propagated over long distances with minimum energy loss, usually because of refraction back into this layer from above owing to the temperature gradient, and from below owing to the pressure gradient. ΘΚΠ the world > the earth > water > sea or ocean > region of sea or ocean > [noun] > specific layers laminarian zone1851 stratosphere1932 troposphere1932 scattering layer1942 sound channel1946 psychrosphere1956 thermosphere1956 Ekman layer1957 thermo-halocline1964 nepheloid layer1965 1946 Bull. Geol. Soc. Amer. 57 928 The velocity of propagation of sound decreases, due to the temperature decrease, from the surface to 4000 feet and then increases, due to pressure increase, from there to bottom. This type of velocity pattern is known as a sound channel. 1972 M. G. Gross Oceanogr. vii. 200 This sound channel is a typical feature of the open ocean at depths of around 1000 meters at midlatitudes to near the surface in polar regions. < as lemmas |
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