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Long-Term Ocean Climate Observations (LOCO)
Acoustic Doppler Current Profiler (ADCP)
Acoustic Doppler Current Profiler (ADCP) is an instrument that obtains profiles of water velocity by transmitting sound of known frequency into the water and measuring the Doppler shift of reflections from scatterers, which are assumed to be passively moving with the water. Doppler Shift is named after Johann Doppler (1803-1853), the German physicist who first predicted it: it is the shift in frequency caused by radial motion between a source and an observer. Specifically fD= fS (v/c):Where D is the Doppler-shifted frequency, fS is the source frequency, v is the relative velocity between source and observer, and c is the speed of sound. (source: RD Instruments)