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Oceanographic Instrumentation Recovery

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On March 13th, a dive team consisting of Rick Rendigs (WHFC) and Larry Ball (Woods Hole Oceanographic Institute) participated in a field effort to recover oceanographic instrumentation located off Scituate, MA. Marinna Martini and John Borden (WHFC) led the cruise aboard the fishing vessel CHRISTOPHER ANDREW, skippered by Frank Mariachi. The objective was to recover a bottom-resting micro-tripod that has acoustic-doppler instrumentation used for profiling current regimes in the water column, and a bottom-tethered moored array that contains a time-series sediment trap used for the collection of suspended matter in the water column and material re-suspended from the ocean bottom. At least one of these platforms recently survived a northeast storm that produced 20- to 25-ft waves as recorded at the NOAA buoy off Boston.

One dive at the micro-pod site in ~20 m of water proved unsuccessful. Car-sized boulders that had not been seen on previous dives were encountered during the underwater search. This led team members to re-analyze the location of the original deployment site. Another effort will be made to recover the instrument at a later date. Divers were successful in locating and attaching a recovery line to the tethered mooring containing the times-series sediment trap at the second site in ~23 m of water. The equipment and samples were successfully recovered.

Since December 1989, USGS scientific team members have been deploying and recovering oceanographic instrumentation and collecting sediment cores from specific stations within Massachusetts Bay about three times per year. This instrumentation is part of an ongoing USGS project in conjunction with the Massachusetts Water Resource Authority to assess the impact of the 350,000 to 500,000 gallons per day of secondarily treated effluent upon the sediment chemistry and marine biota in Massachusetts Bay. The effluent is discharged from a sewage outfall that came on line in late September 2000. Data and samples collected after September 2000 are particularly critical for evaluating the effects and ultimate fate of treated effluent that is discharging into Massachusetts Bay and is carried to downstream areas in Cape Cod Bay.

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in this issue: Fieldwork cover story:
Oil Seep Ecology

Research Oceanographic Instrument Recovery

Lidar Data Software

Outreach Moloka'i Earth Day

Earth Day in St. Pete

Florida Oceans Day 2001

Science Safari

Rocks for Teachers II

Meetings Delmarva Coastal Bays

Oceanology International Americas

Staff & Center News Amy Farris: Physics Honors Day

Falmouth Road Race

Gaye Farris New President of NAGC

Visitor—Dr. Ingo Percher

Office of Communications

Publications May Publications List

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