Completed Project: ONR Coastal Mixing and Optics Moored Array Experiment (CMO)

Please see the CMO site in the Upper Ocean Data Archives for the CMO mooring archived data and instrumentation descriptions.

The objective of the Office of Naval Research (ONR) Coastal Mixing and Optics program is to identify and understand the role of vertical mixing processes in determining the mid-shelf vertical structure of hydrography, optical properties and particulate matter. As a part of CMO, the Upper Ocean Processes Group deployed a moored array on the New England Shelf from August 1996 through June 1997. The observations from this array will be used to identify and understand the vertical mixing processes influencing the evolution of stratification over the shelf.

The array consists of a central mooring site, at approximately 40.5 N, 70.5 W, and three surrounding sites. Relative to the central at 70 m depth, the surrounding sites are 10 km inshore at 60 m depth, 10 km offshore at 80 m depth, and 25 km alongshore at 70 m depth.

Each site includes a surface/subsurface mooring pair instrumented for measurement of currents, temperature, and salinity. In addition, an ADCP was deployed on the inshore and offshore moorings. The central site includes a pitch-roll buoy to obtain surface wave spectra and a surface-scanning Doppler sonar to image the surface velocity field. The surface mooring at the central site was instrumented with meteorological sensors for measurement of wind speed and direction, incoming short-wave and long-wave radiation, relative humidity, air temperature, sea-surface temperature, and barometric pressure.

The moored array and its deployment are described in more detail in a technical report (Galbraith et al., 1997: Coastal Mixing and Optics Experiment: Mooring deployment cruise report, Woods Hole Oceanographic Institution, Technical Report WHOI-97-13, 81 pp.). The Upper Ocean Processes Group launched mooring 1000 of the Woods Hole Oceanographic Institution during the CMO Experiment.

CTD surveys were conducted during the deployment and recovery cruises. Cross-shelf transects and along-isobath transects were made with a station separation of about 5 km.

Note: All data are preliminary and subject to change as a result of ongoing processing and quality control.