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Mooring observations from the Mid-Atlantic Bight, July-September 1996 : synthetic aperture sonar primer and coastal mixing & optics programs

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  • This report documents the observations of velocity, temperature and conductivity made in the Mid-Atlantic Bight region of the NW Atlantic Ocean during the Synthetic Aperture Sonar (SAS) Primer experiment. The primary data were obtained from instruments moored in 70 in of water near 40° 30' N, 70° 30' W, from July through September 1996 (Figure 1). Vertical profiles of conductivity, temperature, light transmission and fluorescence were also made during deployment and recovery cruises. The overall goals of this PRIMER program are to assess the feasibility of the operation of an SAS on the continental shelf. A study of acoustic propagation was conducted during the period the mooring was deployed, from August 20 through August 27, by F. Henyey, T. Ewart, and K. Williams (Applied Physics Laboratory / University of Washington). The evaluation of the synthetic aperture sonar itself was performed by S. Stanic and R. Meredith (Naval Research Laboratory). This project was carried out in close cooperation with the ONR-sponsored Coastal Mixing & Optics ARE. In addition to shared logistical planning, we anticipate joint analysis and sharing of data. The specific goals of this project are to describe the internal wave field and associated sound speed fluctuations on the shelf--both statistically and by events. The sampling scheme was designed to resolve the many components of the wavefield including: near-inertial waves, internal tide, background continuum and internal solitary waves. This report is divided into two sections. The first section contains descriptions of the instrumentation deployed on the PRIMER moorings including locations, sampling rates, and calibrations. It also includes a brief description of the CTD sampling and sample profiles from the CTD stations occupied. Copies of the deployment and recovery cruise logs are appended to the first section. The second section contains plots from the mooring deployment. Several views of the time series recorded by the moorings are presented. Time series of vertically separated temperature, salinity, and velocity measurements are shown for the main, subsurface mooring. Temperature observations from sensors at the same depth on horizontally separated mooring are also shown. These data are presented as both low-pass filtered and unfiltered time series. Time is given as day of year 1996 in all of the time series plots; conversion to calendar date is provided in Table 8. The data displayed in these figures are a subset of the data collected during the mooring deployment, all of which are available on CD-ROM from the authors.
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