Summary for Field Activity Number 00004

Alternate Leg: ID (MH34-00)

Area of Operations : Massachusetts Bay, Scituate, Massachusetts, United States, North America, North Atlantic

Dates: September 26, 2000 to September 28, 2000

Chief scientist: Michael Bothner
   William Martin, WHOI

Objectives: Three day trips were completed. Day 1: Exchange moorings off Boston and Scituate. Day 2: Collected sediment cores with the new Hydraulically Damped corer at stations 2, 3 and 3b(near the benthic chamber deployment site). Deployed and recover oxygen profiler - 2 times at station 3 once at station 2. Recovered one Benthic chamber by SCUBA divers. The second chamber was not found. Day 3: An attempt was made to recover the lost slow corer from location east of Stellwagen Bank at 200 m water depth. A three grapling hook assembly (on an 8 foot spreader) was used with a camera attached to the middle hook. Dann Blackwood arranged 6 submersible flashlights on the central hook which did a good job illuminating to the side and bottom. The whole assemblage was lowered on half inch tenex rope (breaking strength about 11,000lbs). Approximately 2 hours were spend on and around the last known position of the core. It was not seen in the camera, nor was it hooked during the dragging operation.

Type of Activity: Sampling;Mooring work;Photography;

Information to be derived: Times series data;Samples and Chemical Analysis;Suspended Sediment Concentrations;

Summary: Moorings recovered: 4(#624,625,626,627 all deployed #00003 MARCUS HANNA May 9-10, 2000.) Moorings deployed: 5(#630,631,632,634 all deployed #01022 MARCUS HANNA Feb 13-14, 2001; #633 recovered #01051 CHRISTOPHER ANDREW Mar 20, 2001.)

USGS Project Number: 32010

Contact: Michael Bothner (mbothner@usgs.gov)

Data and publications on CD-ROM/DVD-ROM: