Resources

RRS James Clark Ross JR20031211 (JR94)

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS James Clark Ross (74JC)
Cruise identifierJR20031211 (JR94)
Cruise period2003-12-11 — 2003-12-15
StatusCompleted
Port of departureRothera, Antarctica
Port of returnStanley, Falkland Islands (Malvinas)
PurposeResearch
ObjectivesThe Southern Ocean is a major component of the coupled ocean-atmosphere climate system. It connects all the other major oceans and influences the water mass characteristics of the deep water over a large proportion of the world. It is an area of net heat loss from the ocean to the atmosphere, and is the conduit for substantial heat and freshwater exchange between the ocean basins. The objectives of the cruise were: to observe the location of the surface and subsurface manifestations of the Polar Front; to observe the deep temperature distribution; to measure the baroclinic and barotropic transport of the ACC at Drake Passage; to determine the interannual variability by comparison with previous datasets; to relate these measurements to continuous time series from moorings maintained by POL; to relate these measurements to surface SST and SSH data acquired by satellites.
High quality CTD and salinity sample measurements were made at 30 stations across Drake Passage from Elephant Island to Burdwood Bank at the same positions as occupied in previous cruises. Stations were full-depth, to within 10 metres of the seabed, with a maximum spacing of 35 km and at 50 metre bathymetry increments on the continental slopes. One other test station was carried out in Drake Passage, and the RaTS station was occupied in Marguerite Bay. The CTD package included a single downlooking WH300 Lowered ADCP. Underway measurements included single-point bathymetry, thermosalinograph, surface meteorology and shipboard ADCP down to 320 metres.
The previous leg of this cruise was from 28 Nov to 06 Dec when the ship went from Stanley to Rothera.

There are two Cruise Summary Reports for JR93 (4598) and JR94 (4597).
Chief scientistBrian A King (Southampton Oceanography Centre)
ProjectCLIVAR, Drake Passage repeats
Coordinating bodyWCRP
Cruise reportRRS James Clark Ross JR20031211 (JR94) cruise report jr94.pdf (0.66 MB) 
Ocean/sea areas 
GeneralSouth Atlantic Ocean
SpecificSouthern Ocean
Track chartsRRS James Clark Ross JR20031211 (JR94) cruise track — jr94track.pdf (7.42 MB) 
Measurements 
Physical oceanography 
Surface measurements underway (T,S)Quantity: activity duration in days = 19
Description: thermosalinograph
Water bottle stationsQuantity: number of stations = 32
Description: 10 bottles per station for sample salinity
CTD stationsQuantity: number of stations = 32
Description: SBE CTD
Current profiler (eg ADCP)Quantity: activity duration in days = 19
Description: shipboard ADCP
Current profiler (eg ADCP)Quantity: number of stations = 32
Description: lowered ADCP (RDI workhorse 300 KHz)
Meteorology 
Incident radiationQuantity: activity duration in days = 19
Description: surface met
Routine standard measurementsQuantity: activity duration in days = 19
Description: surface met
Geology and geophysics 
Single-beam echosoundingQuantity: activity duration in days = 19
Description: bathymetric survey