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Long-term Oceanographic Observations in Western Massachusetts Bay, Offshore of Boston
U.S. Geological Survey Digital Data Series DDS-74, Version 2.0

List of Figures

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PDF containing figures 1-25

Figure 1 Massachusetts Bay.
Figure 2 Residual circulation in Massachusetts Bay based on 1989-1991 field experiment.
Figure 3A Photographs of U.S. Coast Guard Cutter White Heath.
Figure 3B Photograph of U.S. Coast Guard Cutter Marcus Hannah.
Figure 3C Photograph of fishing vessel Christopher Andrew.
Figure 4 Locations of surface, subsurface, and bottom moorings at Site A.
Figure 5A Photograph of the sea floor to the north of Site A.
Figure 5B Photograph of the sea floor to the south of Site A.
Figure 6A Schematic of instruments deployed at Site A, 1989-1994.
Figure 6B Engineering schematic of subsurface mooring deployed at Site A, 1989-1994.
Figure 6C Photograph of the Large Navigational Buoy in March 1990 showing the near-surface VMCM being hung from the side of the buoy.
Figure 7A Schematic of instruments deployed at Site A, 1994-1996.
Figure 7B Engineering schematic of surface mooring deployed at Site A, 1994-1996.
Figure 8A Schematic of instruments deployed at Site A, 1996-2002.
Figure 8B Engineering schematic of subsurface mooring deployed at Site A, 1996-2002.
Figure 9A Schematic of instruments deployed at Site B, 1997-2002.
Figure 9B Engineering schematic of subsurface mooring deployed at Site B, 1997-2002.
Figure 10 Photograph of subsurface mooring being deployed from U.S. Coast Guard Cutter Marcus Hannah at Site B.
Figure 11A Map showing location of Site B.
Figure 11B Map showing detailed locations of moorings at Site B.
Figure 12 Photograph of the sea floor near Site B.
Figure 13A Photograph of bottom tripod being deployed aboard the U.S. Coast Guard Cutter Marcus Hannah. This system was used at western Massachusetts Bay Site A.
Figure 13B Schematic of bottom tripod system deployed at the long-term western Massachusetts Bay Site A.
Figure 13C Photograph of small tripod frame used to deploy ADCP and tube sediment trap at Site B.
Figure 13D Photograph of BASS current sensors attached to a large tripod being recovered at Site A.
Figure 13E Photograph of a BASS current sensor.
Figure 13F Photograph of Sea-Bird oxygen, conductivity, and temperature sensors and pump mounted on tripod frame.
Figure 13G Photograph of a Benthos 35 mm camera mounted on tripod frame.
Figure 14 Photograph of Acoustic Doppler Current Profiler ( ADCP).
Figure15 Photograph of a Vector Measuring Current Meter ( VMCM).
Figure 16 Photograph of SEACAT temperature probe, conductivity sensor, and conductivity cell pump.
Figure 17 Photograph of MicroCAT that measures temperature and salinity.
Figure18 Photograph of Sea-Tech transmissometer.
Figure 19 Photograph of a Honjo time-series sediment trap.
Figure 20 Filter weights applied to the time-series data in the low-pass filter PL33.
Figure 21 Amplitude transfer function for the low-pass filter PL33, showing the amplitude response as a function of frequency.
Figure 22 Photographs of a 41" subsurface float and tripod recovery floats deployed in September 1988 and recovered in February 1999.
Figure 23APhotograph of a VMCM current meter deployed 10 m above bottom from July to October 1990.
Figure 23B Photograph of a VMCM current meter and transmissometer deployed 5 m below the surface from July to October 1990.
Figure 23C Photograph of a subsurface float and VMCM deployed at about 5 and 8 m below the surface from March to September 2003.
Figure 24 Photograph of the lens of the bottom camera and battery case recovered in September 1999.
Figure 25 A bottom tripod tangled with lobster gear recovered from the western Massachusetts Bay Site A.

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