NISKINE

Near-Innertial Shear and kinetic energy

 

NISKINE in the North Atlantic experiment was a multi-cruise experiment this summer on the North Atlantic. The process cruise on board R/V Armstrong was led by Luc Rainville from APL/University of Washington, and had a team of engineers and scientists from University of Washington, Stanford, University of Miami, and Scripps. Anna and Sara were the team from Scripps with a wirewalker equipped with a CTD, velocity, optics, and a shear/temperature/conductivity microstructure sensor (Epsi). The surface buoy was outfitted with satellite telemetry to acquire true wind speed and direction. The 24 day cruise consisted of multiple deployments and recoveries of a drifting array of assets (including the wirewalker, SVP-B drifters, wave buoys) and autonomous assets (EM-Apex floats and wave gliders). While assets were deployed the the ship towed a Triaxus profiler with various instruments.

The remotely operated underwater vehicle (ROV) SIO Trident and associated equipment sits on the back deck of the R/V Sally Ride, ready for PLUMEX-related operations.

Schematic of the experiment. Water drawn from the ocean is mixed with hyper-saline (or sediment-laden) water prepared on board the vessel, and the mixture is pumped back into the ocean as a plume at depths in the range 25-100m. The evolution and steady-state nature of the plume is monitored using PADs acoustic technology mounted on the fore of the vessel and ROV technology. 24 tons of salt need to be stored on the vessel, and there will be two ~20m3 storage containers as reservoirs for hyper- saline water. The plume hose, ROV umbilical, and PADS will all be in the water between 25-125 m depth at the same time; careful coordination and ship handling will be required.

MOD postdoc Anna Savage and engineer Sara Goheen take on the North Atlantic as part of the NISKINe process cruise in May 2019. Anna and Sara deployed the Wirewalker from the R/V Neil Armstrong as part of a multi-year effort to study near-inertial internal waves!

MOD postdoc Anna Savage and engineer Sara Goheen take on the North Atlantic as part of the NISKINe process cruise in May 2019. Anna and Sara deployed the Wirewalker from the R/V Neil Armstrong as part of a multi-year effort to study near-inertial internal waves!


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