Science - Instruments Instruments | Station Table | Data Moorings A string of instruments designed to be left unattended for long periods of time, moorings give scientists the ability to look at the evolution and variability of water properties and currents. More Beaufort Shelf Edge Mooring Array (WHOI) The WHOI array is a tightly spaced line of 8 moorings situated across the Beaufort continental slope. More Chukchi Outflow Mooring Array (UW/UAF) Four subsurface moorings in the Chukchi Sea are being shared equally between the University of Alaska, Fairbanks and the University of Washington, Polar Science Center. More Arctic winch This instrument is new for 2003. It will measure the water column between the top of the mooring and the underside of the ice at mooring site BS3. More CTD The CTD, which stands for “conductivity, temperature, depth”, is an instrument lowered over the side of the ship from a cable. It measures the temperature, salt content, and hence the density of the water column from the surface to the sea-floor. More XCTD The XCTD is an expendable CTD probe for use in inclement weather or for doing rapid surveys. More Acoustic Doppler Current Profiler (ADCP) The ADCP measures currents by reflecting sound energy off of small particles in the water. More Acoustic Recording Package (ARP) The ARP is a bottom-moored instrument which records the sounds of passing marine mammals. More Video Plankton Recorder (VPR) The VPR is essentially an underwater microscope. It is used to identify tiny plankton and zooplankton in the water column. More