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How had Munk planned to measure global ocean temperature in 1991?

Satellite imaging
Diving expeditions
Underwater sound propagation
Seafloor sensors

Answer

Using underwater sound propagation, Munk aimed to measure global ocean temperatures by transmitting low-frequency sound waves through different ocean basins and analyzing the variations in their travel times caused by temperature-induced changes in water density. This innovative approach, known as acoustic thermometry, allowed scientists to obtain precise temperature measurements across vast oceanic distances, providing valuable data for climate studies and understanding ocean dynamics.