Cruise inventory

RRS James Clark Ross JR20070226 (JR165, JR170, JR174)

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS James Clark Ross (74JC)
Cruise identifierJR20070226 (JR165, JR170, JR174)
Cruise period2007-02-26 — 2007-04-16
StatusCompleted
Port of departureStanley, Falkland Islands (Malvinas)
Port of returnStanley, Falkland Islands (Malvinas)
PurposeResearch
ObjectivesThe principal objective of this cruise on the RRS James Clark Ross was to recover a mooring previously deployed during cruise JR155 (15-17/12/06) in Ryder Bay, off Rothera Research Station.

Full depth CTDs were also carried out at both the Ryder Bay Rothera Biogeochemical Times Series site (RaTS) 2 miles from Rothera with a 500 m water column depth and one 'deep' site 22 miles from Rothera research station with a 840m water column depth. The mooring was successfully recovered and the majority of data downloaded from the mooring equipment array.

Samples from sediment traps and water and particulate samples collected from CTDs were stored after appropriate stabilisation at either 4 degrees centigrade with formalin (trap samples) or stored frozen (minus 20 degrees centigrade) for nutrients and particulates from CTD.
Chief scientistDeborah Shoosmith (British Antarctic Survey), Keith Weston (University of East Anglia School of Environmental Sciences), Mark Brandon (Open University Department of Earth and Environmental Sciences)
Cruise reportRRS James Clark Ross JR20070226 (JR165, JR170, JR174) cruise report jr174.pdf — access key 'C' (0.97 MB) 
Ocean/sea areas 
GeneralSouth Atlantic Ocean
SpecificMarguerite Bay, Adelaide Island, Antarctica
Track chartsRRS James Clark Ross JR20070226 (JR165, JR170, JR174) cruise track — jr174trk.pdf (00 MB) 
Measurements 
Physical oceanography 
CTD stationsQuantity: number of profiles = 262
Description: CTD
CTD stationsQuantity: number of profiles = 262
Description: CTD
Subsurface temperature and salinity measurementsQuantity: number of measurements = 5527
Description: 2757 data cycles by the RBR 11410 data logger and 2770 data cycles by the RBR 11768 data logger
Current profiler (eg ADCP)Quantity: number of measurements = 11221
Description: Data cycles by the shallow 75 khz ADCP (part of the mooring equipment) measuring water velocity
Other physical oceanographic measurementsQuantity: number of deployments = 20
Description: The TT800 unit and its hydrophone was deployed on 20-30 successive occasions at a series of increasing depths
Moorings, landers, buoys 
Physical oceanography 
CTD stations67° 34' 0" S  68° 14' 0" W — RaTS CTD station start position. Depth to 840 m
CTD stations67° 55' 12" S  68° 23' 24" W — Full depth CTD was carried out at the deep mooring site. Depth to 815 m.
Subsurface temperature and salinity measurements67° 34' 0" S  68° 14' 0" W — RaTS CTD station start position. Salinity samples Bottom-200m and 50-15m.
Chemical oceanography 
Phosphate67° 55' 24" S  68° 24' 35" W — Deep CTD station start position. Samples collected for nutrients
Nitrate67° 55' 24" S  68° 24' 35" W — Deep CTD station start position. Samples collected for nutrients
Nitrite67° 55' 24" S  68° 24' 35" W — Deep CTD station start position. Samples collected for nutrients
Isotopes67° 55' 24" S  68° 24' 35" W — Deep CTD station start position. Samples collected for oxygen-18
Isotopes67° 34' 0" S  68° 14' 0" W — RaTS CTD station start position. Oxygen-18 from all depths
Other chemical oceanographic measurements67° 55' 24" S  68° 24' 35" W — Deep CTD station start position. Dissolved ammonium analysed from 0, 15, 50, 100, 500m and bottom
Other chemical oceanographic measurements67° 55' 24" S  68° 24' 35" W — Deep CTD station start position. Samples collected for biogenic Si. Bsi from all depths - 2000ml filtered
Other chemical oceanographic measurements67° 34' 0" S  68° 14' 0" W — RaTS CTD station start position. BSi from all depths - 2000ml filtered
Other chemical oceanographic measurements67° 34' 0" S  68° 14' 0" W — RaTS CTD station start position. Dissolved ammonium from 0, 15, 50, 100, 250m and bottom
Biology and fisheries 
Particulate organic matter (inc POC, PON)67° 34' 0" S  68° 14' 0" W — RaTS CTD station start position. POC from all depths - 2000ml filtered
Particulate organic matter (inc POC, PON)67° 55' 24" S  68° 24' 35" W — Deep CTD station start position. Samples collected for particulates. Particulate organic carbon/nitrogen (POC/N) from all depths - 1000ml filtered
Dissolved organic matter (inc DOC)67° 34' 0" S  68° 14' 0" W — RaTS CTD station start position. Dissolved inorganic nutrient and DON/DOC samples filtered from all depths