Turbulence and Waves over Irregularly Sloping Topography (TWIST)

The objective of this observational program was to discover what dictates the magnitude, frequency and spatial scales of internal waves in continental slope regions. This information can then be compared to the wave properties and scales in the ocean's interior. Elevated rates of turbulence and dissipation have previously been observed in areas of rough topography asociated with the Mid-Atlantic Ridge. This program allows additional observations to be made in another region of anticipated active mixing. Similar elevations of turbulence and mixing over continental slope regions where small-scale bathymetric features (roughness) occur on the slope are anticipated.

This research program was conducted aboard the R/V Oceanus May 10 to June 8, 1998. This was the first time the HRP was used with eXpendable Current Profilers (XCPs), Moored Velocity Profilers (MVPs), and a lowered Acoustic Doppler Current Profiler (LADCP) making complimentary measurements. The timeline of cruise tasks shows which instrument systems were used at which times during the cruise, and their correlation to windspeed and lunar phase. A more detailed description of the experimental program is available here.

The WHOI scientsts involved in the experiment are: Kurt Polzin, John Toole, and Raymond Schmitt. Eric Kunze from U.Washington also contributed to the success of the program. Technical support is provided by Ellyn Montgomery, Gwyneth Packard, Dave Wellwood, Ken Doherty, Steve Liberatore, and John Kemp.

This program is part of the Littoral Internal Wave Initiative (LIWI), which is supported by the Office of Naval Research (ONR).

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