LT Sam Greenaway and Physical Scientist Vanessa Self-Miller prepare to deploy a Conductivity-Temperature-Depth (CTD) instrument. CTDs measure the essential parameters to compute the speed of sound in water, which is a critical correction for Hassler’s echosounder data.

LT Sam Greenaway and Physical Scientist Vanessa Self-Miller prepare to deploy a Conductivity-Temperature-Depth (CTD) instrument. CTDs measure the essential parameters to compute the speed of sound in water, which is a critical correction for Hassler’s echosounder data. Image courtesy of NOAA Office of Marine and Aviation Operations Public Affairs.

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