Summary for Field Activity Number 1983-011-FA

Alternate Leg ID: 140

Area of Operations: southern New England shelf, slope, rise, Lydonia Canyon to Atlantis Canyon, Georges Bank, United States, North America, North Atlantic

Dates: October 17, 1983 to October 24, 1983

Objectives: 1. Recover 5 subsurface moorings deployed on the continental slope and upper rise (#271 at Station SS; #267 at Station SB; #268 at Station SC; #269 at Station SD; and #270 at Station SE). 2. Deploy 3 subsurface current moorings (#276 at Station SA; #274 at Station SE; and #275 at Station SF). 3. Deploy 1 bottom tripod (#273 at Station T). 4. Deploy 4 surface marker buoys (2 ea. at stations SF and T). 5. Conduct a detailed hydrographic survey along the edge of the continental shelf from Lydonia Canyon to Atlantis Canyon. 6. Obtain surface grab samples and hydrostatically damped cores.

Type of Activity: Sampling
Mooring work

Information to be derived: Time series data
Samples and chemical analysis
Mooring recovery and deployment
Surface marker buoy deployment

Summary: All work planned was completed. Considerable time was spent dragging for subsurface moorings as marginal batteries caused release failures. All current meters were recovered at SA, SB, SD, and SE. Near bottom sediment traps and releases at SD and SE were lost when the mooring was cut by grappling. There may be as many as 3 current meters plus sediment traps remaining at SC. All but 1 VACM functioned properly. Moorings deployed: 4 (#273, 274, 275, and 276 all recovered FA 84004 OCEANUS 149 Mar. 12-19,1984). Moorings recovered: 5 (#267, 268, 269, 270, and 271 all deployed FA 82037 OCEANUS 130 Nov. 9-16, 1982). Deployed surface buoys: 4 (A, J, L, and X); CTDs: 32; XBs: 31; Surface salinity samples: 63; Deep salinity samples: 6; Surface nutrient samples: 38; Deep nutrient samples: 10; Suspended sediment samples: 8; Oxygen samples: 9; Van Veen bottom samples: 7; Hydraulically damped cores: 2.

USGS Project Number: EA-PO

Contact: Brad Butman (bbutman@usgs.gov)