Oceanographic time-series measurements from the mouth of the Columbia River, Oregon and Washington, 2013

Instrumented tripods were deployed on May 9, 2013 from the F/V Cape Windy at three locations within the MCR. Each tripod was equipped with similar instrumentation including an upward looking 1200 kHz Teledyne RD Instruments acoustic Doppler current profiler (ADCP), a 5 MHz Sontek acoustic Doppler velocimeter (ADV) and Hydra data recorder, an RBR conductivity, temperature, and depth (CTD) sensor, and Imagenex 881 (fan beam) and 881A (pencil beam) sonars. The three tripods frames were approximately 2.5 m tall and 3 m wide. After navigating to the planned tripod deployment locations, the tripods were lowered to the seafloor using the ship's boom, and once on the bottom, the locations were recorded using a hand-held GPS and the water depth was recorded using the ship's echosounder. Two independent methods for recovery of the tripods were included on the tripods. A ground line that led to a 500-lb clump weight and a surface buoy was the primary recovery method. The tripods also included Edgetech CART acoustic releases attached to a 14 inch float and line bucket mounted on the tripod. On June 15, 2013, all the tripods were successfully recovered from the F/V Cape Windy resulting in a 38-day deployment. Two of the tripods (North and West) were recovered using the ground line and surface float. During recovery of the South tripod, the line between the clump weight and surface float parted. The acoustic release was triggered and the float and line was used to recover the instrument package.

After recovery of the tripods, the manufacturers' software was used to download the data, apply calibration coefficients, and convert the data to scientific units. These output files were then converted by custom, instrument-specific Matlab programs to netCDF files.

Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed.