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16-17 May 2010

Over the course of a head-spinning 2-day, 5-dive frenzy we fetched 3 instrument platforms, re-deployed 4 instrument platforms and collected samples from 4 different locations. The action was so quick, it was sometimes hard to know whether we were coming or going! Fortunately, our chief scientists Mairi Best and Brian Bornhold kept everything straight, and we were able to check off plenty of tasks on our to-do list.

Platform Shuffle

The end of this flurry left us left with only one instrument platform on deck, Barkley Benthic Pod 2, which we hope to return to the seafloor shortly. Each of the others was cleaned and refurbished by NEPTUNE Canada instrument manager Reece Hasanen and contractors Kim Wallace and Jason Williams. Problematic instruments were removed, and some new instruments were added.

Instruments deemed unseaworthy (for return to the seafloor this cruise) included:

  • Pod 3 plankton pump (significant corrosion causing mechanical problems)
  • Pod 4 Imagenex multibeam sonar (corrosion on sonar head)
  • Pod 4 Microbial sensors (electrical cable short and sensor damage)
  • Upper Slope hydrophone (corrosion - but replaced with a new hydrophone)


NEPTUNE Canada contractors Kim Wallace and Jason Williams troubleshoot a pan & tilt mechanism for one of our seafloor video cameras.

Here's a summary of what was previously and is currently installed on or connected to the instrument platforms we have redeployed so far (changes highlighted):

Barkley Benthic Pod 1 (Axis)

October 2009
May 2010
  • Kongsberg Mesotech Rotary Sonar
  • low-light black & white video camera
  • Naxys hydrophone
  • Kongsberg Mesotech Rotary Sonar
  • low-light black & white video camera
  • Naxys hydrophone
  • Nortek Aquadopp High Resolution Current Profiler

Barkley Benthic Pod 3

October 2009
May 2010
  • Kongsberg Mesotech Rotary Sonar
  • RDI Acoustic Doppler Current Profiler ADCP (150KHz)
  • low-light black & white video camera
  • plankton pump
  • Kongsberg Mesotech Rotary Sonar
  • RDI Acoustic Doppler Current Profiler ADCP (150KHz)
  • low-light black & white video camera
  • Nortek Aquadopp High Resolution Current Profiler

Barkley Benthic Pod 4

October 2009
May 2010
  • Seabird Conductivity-Temperature-Depth (CTD) sensor 
  • WetLabs fluorometer
  • Imagenex multibeam sonar
  • microbial sensors
  • Seabird Conductivity-Temperature-Depth (CTD) sensor
  • WetLabs fluorometer
  • colour HD video camera with pan & tilt

Barkley Upper Slope

October 2009
May 2010
  • Seabird Conductivity-Temperature-Depth (CTD) sensor
  • RDI Workhorse Long Ranger 75kHz ADCP (Acoustic Doppler Current Profiler)
  • broadband seismometer
  • BPR (Bottom Pressure Recorder)
  • Naxys hydrophone
  • Seabird Conductivity-Temperature-Depth (CTD) sensor
  • RDI Workhorse Long Ranger 75kHz ADCP (Acoustic Doppler Current Profiler)
  • broadband seismometer
  • BPR (Bottom Pressure Recorder)
  • Naxys hydrophone

Sample Collection

With the help of ROPOS, we collected "push core" sediment samples at Barkley Benthic Pods 1, 3 and 4. These were processed on-ship by graduate student Katleen Robert, and will be sent to collaborating scientist Paul Snelgrove at Memorial University for further analysis.

ROPOS also helped us collect two "benthic islands" from Barkley Canyon axis. These clumps of hard clay support an unusual profusion of life, and will be studied closely by benthic ecologists.

Photos

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