Abstract

A suite of measurements were made recently (February–March 1990) as part of the ‘‘Surface WAve Processes Program’’ (SWAPP). Included were measurements from two surface-scanning Doppler sonar systems, operated at 75 and 195 kHz. These were designed and operated with surface waves and mixed layer motions specifically in mind. The estimated surface velocity fields provide detailed information about both the surface waves and underlying low-frequency motions, such as Langmuir circulation. A variety of phenomena, such as surface wave breaking, Langmuir circulation, and the evolution of the directional-frequency spectrum, can be tracked as conditions changed in time. A rapidly profiling CTD system provided profiles of T, S, and density versus time (every 130 s) and depth (over the top 400 m of the ocean). These complement especially the measurements of Langmuir circulation, and help to describe the accompanying deepening of the mixed layer under the influence of wind and waves. [Work supported by ONR.]

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