Acoustical Tomography senses differences in which properties to study ocean structure?

Acoustical Tomography senses differences in which properties to study ocean structure?

• A. Temperature, Salinity, and Movement
• B. Temperature
• C. Salinity
• D. Movement

Answer: (A)

Acoustical tomography relies on how sound speed varies through seawater to map the structure of the ocean. The speed of sound in seawater is affected by temperature, salinity, and pressure (depth), and currents can influence the measured signals as well. By sending acoustic signals along many paths and measuring travel times and Doppler shifts, this method reconstructs spatial variations in sound speed. Those variations reveal changes in temperature and salinity, and the movement of water (currents) that transport sound and alter the received signal. So the technique detects differences in all three properties—temperature, salinity, and movement—because each can change how fast and how the sound propagates through the water. Relying on only one property would miss important parts of the ocean’s structure: temperature and salinity together shape the sound-speed field, and currents add dynamic changes that tomography can capture through travel-time and frequency analyses.

Acoustical tomography relies on how sound speed varies through seawater to map the structure of the ocean. The speed of sound in seawater is affected by temperature, salinity, and pressure (depth), and currents can influence the measured signals as well. By sending acoustic signals along many paths and measuring travel times and Doppler shifts, this method reconstructs spatial variations in sound speed. Those variations reveal changes in temperature and salinity, and the movement of water (currents) that transport sound and alter the received signal.

So the technique detects differences in all three properties—temperature, salinity, and movement—because each can change how fast and how the sound propagates through the water. Relying on only one property would miss important parts of the ocean’s structure: temperature and salinity together shape the sound-speed field, and currents add dynamic changes that tomography can capture through travel-time and frequency analyses.