Cruise inventory

RV Oceanus OC436

Cruise summary report

Cruise Info. 
Ship name (ship code)RV Oceanus (32OC)
Cruise identifierOC436
Cruise period2007-04-07 — 2007-04-15
StatusCompleted
Port of departureWoods Hole, United States
Port of returnWoods Hole, United States
PurposeResearch
ObjectivesBackground

This cruise constitutes one element of an ongoing observational program ― Line W ― funded by the U.S. National Science Foundation to investigate the characteristics and consequences of interannual variations in the Northwest Atlantic's deep western boundary current (DWBC). This study is documenting for an initial 4-year period, the temperature, salinity, tracer and velocity variations of the DWBC upstream of its Gulf Stream crossunder point. Line W includes a 5-mooring array of instruments situated in the DWBC flow regime on the continental slope south of Woods Hole and is augmented by twice-yearly occupations of a hydrographic section along this line. A companion research program by U.K. investigators is sampling bottom pressure variability at each of our mooring sites (and an additional site shoreward of the shallowest mooring) plus two additional lines crossing the DWBC to the east of Line W. The moored array, which consists of 3 McLane profilers and 2 moorings of current meters plus T/C sensors, is designed to quantify changes in DWBC water properties, stratification (potential vorticity) and transport. A sixth mooring of current meters, deployed in the mean axis of the Gulf Stream along Line W was added in spring 2005 (This mooring, named GUSTO-05, is maintained by Dr. M. McCartney and funded by WHOI's Ocean and Climate Change Institute.) Shipboard observations using CTD, LADCP and discrete sampling for salinity, oxygen, CFCs, SF6 and I129 measure the water column properties at high spatial resolution to help verify that the array resolves interannual signals.
Chief scientistRuth Curry (Woods Hole Oceanographic Institution Department of Physical Oceanography)
ProjectLine W
Coordinating bodyWHOI
Cruise reportRV Oceanus OC436 cruise report oc436.pdf — access key 'C' (0.39 MB) 
Ocean/sea areas 
GeneralNorth West Atlantic Ocean (limit 40W)
SpecificNorth West Atlantic Ocean between Woods Hole and Bermuda
Track chartsRV Oceanus OC436 cruise track — oc436trk.pdf (00 MB) 
Measurements 
Physical oceanography 
CTD stationsQuantity: number of profiles = 17
Description: Seabird 911 CTD plus LADCP consisting one downward looking broadband ADCP and one upward looking 300 kHz (Workhorse) RDI transducer.
Current profiler (eg ADCP)Quantity: number of profiles = 17
Description: Seabird 911 CTD plus LADCP consisting one downward looking broadband ADCP and one upward looking 300 kHz (Workhorse) RDI transducer.
Moorings, landers, buoys 
Physical oceanography 
Current meters38° 50' 37" N  69° 11' 4" W — Sub-surface mooring W2, equipped with McLane moored profilers (MMP), current meters and T/C recorders, recovered and replaced.
Current meters38° 4' 23" N  68° 38' 59" W — Sub-surface mooring W3 equipped with McLane moored profilers (MMP), current meters and T/C recorders, recovered and replaced.
Current meters39° 36' 1" N  69° 43' 3" W — Sub-surface mooring W1, equipped with McLane moored profilers (MMP), current meters and T/C recorders, recovered and replaced.