Purpose: The objectives for this cruise focus on activities supporting the Benthic Biology and Ecology Project 901007, as well as studies of the effects of a sunken shipping container on the seafloor community at 1281 m depth. Specific objectives include: 1) Resample and terminate the urchin growth and caging experiment initiated in September 2011 at 200, 600, and 1000 m depth. To accomplish this we will use the ROV to ; - collect higher resolution video of the caged locations and nearby control sites, - collect sediment cores within caged areas and control sites, - collect megafauna inside cages and control areas, and - collect all caged sea urchins (Strongylocentrotus fragilis). 2) Recover the Benthic Respiration System from 3200 m depth at the Corn Bale Site 3) Sample the Corn Stover Bale at 3200 m depth. We will use an oxygen profiling probe to measure oxygen from the outside to the inside of the bale and to collect pore fluid samples. Sediment cores will be used to collect macrofaunal and meiofauna samples in the vicinity of the bale. The ROV suction sampler will be used to collect megafauna on and near the bale. ROV video transect will be performed to quantify the distribution of benthic megafauna near the bale 4) Sample the sunken shipping container. We will use the ROV to collect video transects on and in the vicinity of the container to evaluate changes in the benthic fauna community associated with the bale. Sediment samples will be collected for analysis of chemical contaminants near the bale. 5) Benthic megafauna will be collected for laboratory studies concerning the effects of ocean acidification and hypoxia. 6) Benthic video transects on Smooth Ridge (200, 400, 600, 800, 1000, 1500m) will be sampled as time allows. 7) The benthic mooring at the Clam Field Axis site will be recovered and redeployed.
Chief scientist: Jim Barry
Scheduled start time: 12/11/2013 4:00:00 PM UTC
[12/11/2013 8:00:00 AM Pacific]
Scheduled end time: 12/17/2013 5:30:00 AM UTC
[12/16/2013 9:30:00 PM Pacific]
Equipment: ROV Doc Ricketts Maximum number of sediment cores possible Suction sampler w/ Carousel and "gravity sieve mount' Rope and hooks to recover urchin cages as during the October cruise. We will recover 15 cages during this cruise (9 from 600 m, 6 from 200 m) Crane for benthic mooring recovery and deployment Laser scale for video transects. Bioboxes.