Summary for Field Activity Number 83011

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

Chief scientist: Brad Butman
   

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; #270 at station SE. 2. Deploy 3 subsurface current moorings (#276 at station SA; #274 at station SE; #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 detailed hydrographic survey along the edge of the Continental Shelf from Lydonia to Atlantis Canyons. 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 completed. Considerable time spent dragging for releases as marginal batteries caused release failures. All current meters recovered at SA, SB, SD, and SE. Near bottom sediment traps and releases at SD and SE lost when mooring was cut by grappling. May be as many as 3 current meters plus sediment traps remaining at SC. All but 1 VACM functioned properly. Moorings deployed:4 (#273,274,275,276 all recovered #84004 OCEANUS 149 Mar. 12-19,1984); Moorings recovered:5 (#267,268,269,270,271 all deployed #82037 OCEANUS 130 Nov. 9-16, 1982); Deployed surface buoys:4 (A,J,L,X); CTD:32; XB:31; Surface salinity samples:63; Deep salinity samples:6; Surface nutrient samples:38; Deep nutrient samples:10; Suspended sediment samples:8; Oxygen samples:9; VanVeen bottom samples:7; Hydraulically dampled corer:2;

USGS Project Number:

Contact: Brad Butman (bbutman@usgs.gov)

InfoBank: uses the identifier O-40-83-GK. Visit this site for more information.