Cruise inventory

RRS James Clark Ross JR20110128 (JR244)

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS James Clark Ross (74JC)
Cruise identifierJR20110128 (JR244)
Cruise period2011-01-28 — 2011-03-16
StatusCompleted
Port of departureStanley, Falkland Islands (Malvinas)
Port of returnStanley, Falkland Islands (Malvinas)
PurposeResearch
ObjectivesOn cruise JR244 a programme of marine geological and geophysical work was carried out around the South Orkney Islands and in the southern Weddell Sea for two BAS programmes. In addition, three oceanographic moorings were recovered from the outer continental shelf and slope in the southern Weddell Sea for a University of Bergen-BAS collaborative project. The cruise was combined with BAS logistic activities, which involved uplifting 27 people from Halley Station and a field party of four people from James Ross Island. In view of the long passage necessary to reach the southern Weddell Sea, it was clear that many days of ship time could be saved through combining different activities within a single expedition. During the cruise RRS James Clark Ross ventured further south the ever before, reaching the Filchner Ice Shelf front and carrying out significant research work in that area.
The data and samples collected on the cruise will provide new constraints on the maximum extent of glacial ice around the South Orkney Islands and in the southern Weddell Sea during the late Quaternary, the dynamic behaviour of the expanded ice cap and ice sheet, the history of glacial retreat in these areas since the last major advance, and variations in palaeoclimatic and palaeoceanographic conditions in the same areas. Data from the oceanographic moorings that were recovered extend a long-term dataset that has monitored an important input to Antarctic Bottom Water production over a period of more than 30 years.
Chief scientistRobert D Larter (British Antarctic Survey)
ProjectPolar Science for Planet Earth
Coordinating bodyBritish Antarctic Survey
Cruise reportRRS James Clark Ross JR20110128 (JR244) cruise report jr244.pdf — access key 'C' (2.74 MB) 
Ocean/sea areas 
GeneralSouthern Ocean
SpecificScotia Sea, Weddell Sea
Track chartsRRS James Clark Ross JR20110128 (JR244) cruise track — jr244trk.pdf (0.90 MB) 
Measurements 
Physical oceanography 
Surface measurements underway (T,S)Quantity: activity duration in days = 48
Description: BAS oceanlogger, temperature, conductivity
CTD stationsQuantity: number of stations = 20
Description: Seabird SBE9plus CTD including fluorometer, oxygen sensor, PAR sensor, transmissometer, altimeter and rosette of 24 x 12 l Niskin bottles
Biology and fisheries 
Biochemical measurements (eg lipids, amino acids)Quantity: number of samples = 17
Description: Water samples (underway and CTD) were collected for organic geochemical, phytoplankton and zooplankton studies.
PhytoplanktonQuantity: number of samples = 17
Description: Water samples (underway and CTD) were collected for organic geochemical, phytoplankton and zooplankton studies.
ZooplanktonQuantity: number of samples = 17
Description: Water samples (underway and CTD) were collected for organic geochemical, phytoplankton and zooplankton studies.
Acoustic reflection on marine organisms.Quantity: activity duration in days = 2
Description: Kongsberg EK60, backscatter amplitudes at 38, 120 and 200 kHz
Meteorology 
Routine standard measurementsQuantity: activity duration in days = 48
Description: BAS oceanlogger, temperature, pressure, wind speed and direction
Geology and geophysics 
Core - soft bottomQuantity: number of stations = 73
Description: Gravity cores up to 12 m in length
Core - soft bottomQuantity: number of stations = 41
Description: Box cores
Single-beam echosoundingQuantity: activity duration in days = 46
Description: Kongsberg EA600, water depth and reflection amplitude
Multi-beam echosoundingQuantity: activity duration in days = 46
Description: Kongsberg EM120, water depth and backscatter amplitude
Single channel seismic reflectionQuantity: track kilometres = 78
Description: Seismic reflection profiles collected using a single GI gun (45/105 in3) and a hydrophone streamer containing 16 x 6.25 m channels.
Magnetic measurementsQuantity: activity duration in days = 6
Description: SeaSpy proton precession magnetometer, total field
Magnetic measurementsQuantity: activity duration in days = 35
Description: BAS shipboard three-component magnetometer, x-y-z components of field
Other geological/geophysical measurementsQuantity: activity duration in days = 46
Description: TOPAS PS018 parametric sub-bottom profiler, reflection amplitude and travel time
Moorings, landers, buoys 
Physical oceanography 
CTD stations74° 38' 6" S  33° 30' 11" W — Mooring recovered from S2 site. AADI RCM-7 current meters and Microcat CTDs at 25, 100 and 150 m.a.b., in water depth of 612 m
Current meters74° 13' 5" S  35° 55' 17" W — Mooring recovered from WIF3 site. Seaguard RCM current meter at 25 m.a.b., RCM-7 current meter at 90 m.a.b., SBE 37/39 instruments for temperature, conductivity and pressure measurements at 30, 50, 75, 100, 150, 180 and 300 m.a.b., upward-looking AADI ADCP 600 at 250 m.a.b., and downward-looking RDI 300 kHz ADCP at 300 m.a.b., in water depth of 1879 m
Current meters74° 21' 41" S  36° 1' 12" W — Mooring recovered from WIF2 site. RCM-7 current meters at 25 and 90 m.a.b., SBE 37/39 instruments for temperature, conductivity and pressure measurements at 35, 50, 75, 100, 150, 200, 250 and 300 m.a.b., downward-looking RDI 300 kHz ADCP at 210 m.a.b., and upward looking RDI Longranger ADCP at 300 m.a.b., in water depth of 1465 m
Current meters74° 38' 6" S  33° 30' 11" W — Mooring recovered from S2 site. AADI RCM-7 current meters and Microcat CTDs at 25, 100 and 150 m.a.b., in water depth of 612 m