Cruise inventory

RRS James Clark Ross JR20120327 (JR254E, JR257, JR272A)

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS James Clark Ross (74JC)
Cruise identifierJR20120327 (JR254E, JR257, JR272A)
Cruise period2012-03-27 — 2012-04-24
StatusCompleted
Port of departureStanley, Falkland Islands (Malvinas)
Port of returnStanley, Falkland Islands (Malvinas)
PurposeResearch
ObjectivesJR272A cruise objectives were to re-occupy a CTD transect from the Northwest Weddell Sea to South Georgia to study the properties of bottom water as it leaves the Weddell Sea and enters the Scotia Sea. This is part of BAS Polar Oceans core science. The end of the transect close to South Georgia was not completed but there was no sign of bottom water by the point we finished the transect. A mooring was also deployed in South Orkney trough to add to an existing array. A quick (about 6 hours) CTD survey of Cumberland Bay was also completed.

JR257 cruise objectives were to collect a suite of cores made up of diatom- and carbonate-rich sediments from the Polar Front Zone of the SW Atlantic to reconstruct past changes in oceanographic conditions and frontal migrations. The SW Atlantic region is particularly crucial in climate studies as it exerts a disproportionately large influence on Southern Ocean circulation and modification of deep waters. This work is part of the marine component of the Chemistry and Past Climate core science programme and cores collected on this cruise will help determine the role of the Southern Ocean in climate change. Unfortunately, changes to the schedule and the forecasted weather prevented us from exploring the sea mounts in the Georgia Basin for sediments but we were able to collect a promising suite of cores with varying amounts of carbonate material in them from the Falkland Plateau, the North Scotia Ridge (NSR) and the South Georgia continental shelf.

JR254E cruise was dedicated to WAGES (Waves, Aerosols and Gas Exchanges Study),which is a joint project of the National Oceanographic Centre-Southampton and the University of Leeds and is a follow-on from the UK-SOLAS, HiWASE, SEASAW and DOGEE projects.

Throughout the cruise, direct measurements were performed with free drifting and tethered SPAR buoys and also from the ship's underway system. The buoys were deployed in different wind and wave conditions which is essential to improve the parameterisation in terms of mean meteorological and sea-state variables.

An acoustic resonator designed to study bubble size distributions was mounted on one of the SPAR buoys and several deployments were also performed. This line of work has been developed by the University of Southampton.
Chief scientistClaire S Allen (British Antarctic Survey), Hugh Venables (British Antarctic Survey), Margaret J Yelland (National Oceanography Centre, Southampton)
ProjectBAS Polar Oceans; Waves, Aerosols and Gas Exchange Study (WAGES); Chemistry and Past Climate
Coordinating bodyNatural Environment Research Council (NERC)
Cruise reportRRS James Clark Ross JR20120327 (JR254E, JR257, JR272A) cruise report jr257_254e.pdf — access key 'C' (3.05 MB)  RRS James Clark Ross JR20120327 (JR254E, JR257, JR272A) cruise report jr272.pdf (0.96 MB) 
Ocean/sea areas 
GeneralSouthern Ocean
SpecificWedell Sea, Scotia Sea, Royal Bay (South Georgia) and Cumberland Bay (South Georgia)
Track chartsRRS James Clark Ross JR20120327 (JR254E, JR257, JR272A) cruise track — jr257_254etrk.pdf (00 MB)  RRS James Clark Ross JR20120327 (JR254E, JR257, JR272A) cruise track — jr272trk.pdf (00 MB) 
Measurements 
Physical oceanography 
Surface measurements underway (T,S)Quantity: activity duration in days = 28
Description: Underway measurements of water temperature, conductivity, chlorophyll
Water bottle stationsQuantity: number of samples = 256
Description: Water samples collected from CTD bottles to determine salinity
CTD stationsQuantity: number of profiles = 38
Description: CTD casts
Current profiler (eg ADCP)Quantity: number of profiles = 37
Description: Vertical current profiles from LADCP mounted on the CTD frame
Current profiler (eg ADCP)Quantity: activity duration in days = 28
Description: Current measurements with the vessel-mounted ADCP
Other physical oceanographic measurementsQuantity: number of samples = 87
Description: Water samples collected from the underway system to determine salinity
Chemical oceanography 
Other dissolved gasesQuantity: activity duration in days = 28
Description: pCO2 underway measurements
Biology and fisheries 
Biochemical measurements (eg lipids, amino acids)Quantity: number of samples = 30
Description: Water samples collected from CTD bottles to determine biomarker proxies
Biochemical measurements (eg lipids, amino acids)Quantity: number of samples = 15
Description: Underway water samples to determine biomarker proxies
Meteorology 
Routine standard measurementsQuantity: activity duration in days = 28
Description: Underway measurements of air temperature, pressure, relative humidity, photosynthetically active radiation, active radiation, wind speed and velocity
Geology and geophysics 
Core - soft bottomQuantity: number of deployments = 19
Description: Gravity core
Core - soft bottomQuantity: number of deployments = 9
Description: Box core
Single-beam echosoundingQuantity: activity duration in days = 28
Description: Single Beam echosounder
Multi-beam echosoundingQuantity: activity duration in days = 28
Description: Multi-beam echosounder
Moorings, landers, buoys 
Physical oceanography 
Current meters60° 33' 44" S  41° 37' 55" W — The mooring was deployed with two aquadopps' measuring current direction, velocity components, temperature, pressure and tilt and a SBE37 measuring temperature and conductivity. Water depths for each instrument are as follow: SBE37- 2290 m, aquadopp 2259 m, aquadopp- 2009 m. Deployment date was 02Apr2012 at 19:31 UTC on the eastern side of Orkney Passage
Instrumented wave measurements53° 44' 24" S  38° 8' 58" W — Free drifting buoy deployed and recovered on 15/04 to obtain wave measurements
Instrumented wave measurements52° 58' 52" S  43° 22' 24" W — Free drifting buoy deployed and recovered on 12/04 to obtain wave measurements
Instrumented wave measurements63° 4' 17" S  30° 7' 9" W — Tethered Spar buoy deployed and recovered on 04/04 to obtain wave measurements
Instrumented wave measurements51° 56' 44" S  45° 32' 37" W — Bubble Spar buoy deployed and recovered on 22/04 to obtain wave measurements
Instrumented wave measurements63° 20' 26" S  29° 34' 36" W — Tethered Spar buoy deployed and recovered on 04/04 to obtain wave measurements
Instrumented wave measurements54° 5' 49" S  36° 28' 35" W — Bubble Spar buoy deployed and recovered on 18/04 to obtain wave measurements
Instrumented wave measurements51° 25' 23" S  57° 34' 35" W — Tethered Spar buoy deployed on 29/03 and recovered on 30/03 to obtain wave measurements
Instrumented wave measurements61° 33' 6" S  31° 6' 19" W — Tethered Spar buoy deployed and recovered on 06/04 to obtain wave measurements
Instrumented wave measurements53° 5' 11" S  43° 23' 19" W — Tethered Spar buoy deployed and recovered on 12/04 to obtain wave measurements
Instrumented wave measurements53° 44' 26" S  38° 9' 2" W — Tethered Spar buoy deployed and recovered on 15/04 to obtain wave measurements
Instrumented wave measurements51° 55' 30" S  45° 31' 46" W — Tethered Spar buoy deployed and recovered on 22/04 to obtain wave measurements
Instrumented wave measurements51° 26' 7" S  57° 46' 37" W — Bubble Spar buoy deployed and recovered on 28/03 to obtain wave measurements
Instrumented wave measurements60° 33' 52" S  41° 38' 12" W — Bubble Spar buoy deployed and recovered on 02/04 to obtain wave measurements
Instrumented wave measurements51° 25' 18" S  57° 34' 36" W — Bubble Spar buoy deployed and recovered on 30/03 to obtain wave measurements
Instrumented wave measurements51° 47' 45" S  57° 47' 49" W — Tethered spar buoy deployed on 27/03 and recovered on 28/03 to obtain wave measurements
Instrumented wave measurements61° 39' 42" S  31° 6' 45" W — Bubble Spar buoy deployed and recovered on 06/04 to obtain wave measurements
Instrumented wave measurements59° 3' 18" S  30° 50' 9" W — Tethered Spar buoy deployed and recovered on 07/04 to obtain wave measurements
Instrumented wave measurements58° 38' 7" S  30° 49' 28" W — Bubble Spar buoy deployed and recovered on 07/04 to obtain wave measurements
Instrumented wave measurements51° 26' 2" S  57° 46' 36" W — Tethered Spar buoy and recovered deployed on 28/03 to obtain wave measurements
Instrumented wave measurements52° 58' 48" S  43° 22' 36" W — Bubble Spar buoy deployed and recovered on 12/04 to obtain wave measurements
Instrumented wave measurements51° 26' 52" S  57° 40' 44" W — Tethered Spar buoy deployed on 28/03 and recovered on 29/03 to obtain wave measurements
Instrumented wave measurements54° 25' 20" S  35° 44' 8" W — Bubble Spar buoy deployed and recovered on 17/04 to obtain wave measurements
Instrumented wave measurements51° 55' 26" S  45° 31' 39" W — Free drifting buoy deployed and recovered on 22/04 to obtain wave measurements
Other physical oceanographic measurements51° 56' 44" S  45° 32' 37" W — Bubble Spar buoy deployed and recovered on 22/04 to obtain wave measurements
Other physical oceanographic measurements54° 5' 49" S  36° 28' 35" W — Bubble Spar buoy deployed and recovered on 18/04 to obtain wave measurements
Other physical oceanographic measurements54° 25' 20" S  35° 44' 8" W — Bubble Spar buoy deployed and recovered on 17/04 to obtain wave measurements
Other physical oceanographic measurements52° 58' 48" S  43° 22' 36" W — Bubble Spar buoy deployed and recovered on 12/04 to obtain wave measurements
Other physical oceanographic measurements58° 38' 7" S  30° 49' 28" W — Bubble Spar buoy deployed and recovered on 07/04 to obtain wave measurements
Other physical oceanographic measurements61° 39' 42" S  31° 6' 45" W — Bubble Spar buoy deployed and recovered on 06/04 to obtain wave measurements
Other physical oceanographic measurements51° 25' 18" S  57° 34' 36" W — Bubble Spar buoy deployed and recovered on 30/03 to obtain wave measurements
Other physical oceanographic measurements51° 26' 7" S  57° 46' 37" W — Bubble Spar buoy deployed and recovered on 28/03 to obtain wave measurements
Other physical oceanographic measurements60° 33' 44" S  41° 37' 55" W — The mooring was deployed with two aquadopps' measuring current direction, velocity components, temperature, pressure and tilt and a SBE37 measuring temperature and conductivity. Water depths for each instrument are as follow: SBE37- 2290 m, aquadopp 2259 m, aquadopp- 2009 m. Deployment date was 02Apr2012 at 19:31 UTC on the eastern side of Orkney Passage
Other physical oceanographic measurements60° 33' 52" S  41° 38' 12" W — Bubble Spar buoy deployed and recovered on 02/04 to obtain wave measurements
Data held at BODC 
Series/Profiles 
2  Acoustic current meter
Platform or instrument orientation
Vertical velocity of the water column (currents)
Temperature of the water column
Reference numbers
Date and time
Moored instrument depth
Horizontal velocity of the water column (currents)
Platform or instrument orientation
Vertical velocity of the water column (currents)
Temperature of the water column
Reference numbers
Date and time
Moored instrument depth
Horizontal velocity of the water column (currents)

BODC idDate/TimeLocationDoc.
13628342012-04-02 20:15  — 2013-03-30 10:30 60° 33' 47" S  41° 37' 55" W  View metadata report for BODC series reference number 1362834
13628462012-04-02 20:15  — 2013-03-30 10:30 60° 33' 47" S  41° 37' 55" W  View metadata report for BODC series reference number 1362846
1  Moored CTD
Electrical conductivity of the water column
Temperature of the water column
Reference numbers
Date and time
Electrical conductivity of the water column
Temperature of the water column
Reference numbers
Date and time

BODC idDate/TimeLocationDoc.
12235332012-04-02 20:15  — 2013-03-30 10:29:47 60° 33' 47" S  41° 37' 55" W  View metadata report for BODC series reference number 1223533