Other ID: OC159
Organization(s): USGS, Woods Hole Coastal and Marine Science Center
Principal Investigator(s): Bradford Butman
Data Type(s): Environmental Data: CTD, Imagery: Photo, Time Series: Mooring (physical oceanography)
Scientific Purpose/Goals: This cruise was part of a study of currents and sediment transport on the continental slope. Major objectives were: 1) to recover an array of current meters and bottom instruments deployed on the continental slope in March 1984 (Slope Array III); and 2) to conduct a hydrographic survey across the outer shelf and upper slope between 68 and 71 degrees W. OC159 was the third and last cruise associated with the long-term slope measurements.
Start Date: 1984-11-13
Start Port/Location: Woods Hole, MA
End Date: 1984-11-20
End Port/Location: Woods Hole, MA
Equipment Used: CTD, Camera- deep sea, Bottom tripod
Information to be Derived: Time series data;Samples and chemical analysis;
Summary of Activity and Data Gathered: Moorings recovered: 7 (#277, 278, 279, 280, 281, and 282 all deployed FA 84004 OCEANUS 149 Mar. 12-19, 1984; #283 deployed FA 84031 OCEANUS 154 May 16-23, 1984). OC159 was the last in a series of 3 cruises conducted as part of a USGS program to study currents and sediment transport on the Continental Slope. The program is supported by the USGS and by the Minerals Management Service. Despite the weather, all major scientific objectives were accomplished. All moorings were recovered and a moderate CTD survey was completed. One section was repeated 3 times during the cruise which should illustrate temporal changes in suspended sediment during typical storm conditions. A 1-m Sea Tech transmissometer was used to make suspended sediment observations. The oxygen sensor on the CTD failed early in the cruise. Two moorings did not surface although both releases indicated that the release mechanism functioned. Both moorings were recovered by dragging. The mooring at SE was jarred free. The mooring at SA was cut above the lower current meter and release. Close inspection of the release recovered at station SE suggests that crevice corrosion in the release pin may have held the mechanism closed. 15 of 16 current meters and 1 tripod were recovered. CTD stations: 41; XBT stations: 3; Salinity samples: 65; Suspended sediment samples: 54; Nutrient samples: 24.
Staff: Dann Blackwood, Michael Bothner, Bradford Butman, Gregory DiLisio, Mary E. Hastings, John Larson, John Moody, Joseph S. Newell, Carol M. Parmenter, Richard Rendigs, William J. Strahle
Notes: Original Center People field contained: Brad Butman (Ch. Sci.), Dann Blackwood, Mike Bothner, Gregg DiLisio, John Larson, John Moody, Joseph Newell, Carol Parmenter, Richard Rendigs, Mary Polly Shoukimas, William Strahle.
southern New England shelf and slope, Massachusetts, United States, North America, North Atlantic;