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ADCP and Sonar Seep Images
Acoustic Doppler current profiler (ADCP) data showing vertical structure with greater acoustic backscatter intensity and presumably bubble concentrations near the top of the plume (left) and an image of the seep from the BlueView sonar (right).
Credit

Image courtesy of Characterizing Variability in Pacific Northwest Methane Seeps Using a Fleet of Small AUVs.