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In page Walter Munk:

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Tomography has come to be a valuable method of ocean observation,[11] exploiting the characteristics of long-range acoustic propagation to obtain synoptic measurements of average ocean temperature or current. Applications have included the measurement of deep water formation in the Greenland Sea in 1989,[12] measurement of ocean tides,[13][14] and the estimation of ocean mesoscale dynamics by combining tomography, satellite altimetry, and in situ data with ocean dynamical models.[15]