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RRS James Clark Ross JR17002

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS James Clark Ross (74JC)
Cruise identifierJR17002
Cruise period2017-12-23 — 2018-01-22
StatusCompleted
Port of departurePunta Arenas, Chile
Port of returnRothera, Antarctica
PurposeResearch
ObjectivesThe archipelago of South Georgia is a large, isolated land and continental shelf area in the Atlantic sector of the Southern Ocean. South Georgia has been identified as a key source of regional biodiversity, potentially supporting anomalously high levels of endemic and range-edge species and intense phytoplankton blooms supporting a rich food web that includes zooplankton, in particular large densities of Antarctic krill (Euphausia superba), and vertebrate predators (penguins, seals and whales). Yet the near surface waters of South Georgia are some of the fastest warming on the planet.
Since 1981 BAS have undertaken cruises to monitor Antarctic krill biomass as part of the ongoing assessment of the status of the marine ecosystem in the region of South Georgia. This unique time series, known as the Western Core Box series, is part of the Ecosystem Programme contribution to BAS LTMS National Capability. In addition to the acoustic survey, which covers a wide area but has limited temporal coverage, it deploys moorings in the Western Core Box and South Georgia region to complement the annual surveys by providing year round temporal sampling of environmental conditions and acoustic backscatter.
This cruise undertook the regular Western Core Box survey; an acoustic grid survey of 8 transects each 80 km in length, together with associated net and oceanographic sampling that consisted of regulare CTD and XBT deployments, continuous underway data logging and RTM8 net sampling in day and time stations. In addition, net sampling for zooplankton, micro- and nano-plastics were performed and followed up by incubation experiments. Furthermore, two long term moorings in the South Georgia region, at the P3 and WCB site, were successfully refurbished and the P2 site mooring recovered.
17 days of a science program on the vessel RRS James Clark Ross were flanked by logistics visits of the Mare Harbour, Falkland Islands, at the beginnig of the survey and the Rothera UK Antarctic Research Station at the end of the leg.
Chief scientistClara Manno (British Antarctic Survey)
ProjectWestern Core Box
Coordinating bodyBritish Antarctic Survey (BAS)
Cruise reportRRS James Clark Ross JR17002 cruise report jr17002.pdf (4.48 MB) 
Ocean/sea areas 
GeneralSouth West Atlantic Ocean (limit 20W)
Southern Ocean
SpecificScotia Sea. South Georgia
Track chartsRRS James Clark Ross JR17002 cruise track — jr17002trk.pdf (0.28 MB) 
Measurements 
Physical oceanography 
BathythermographQuantity: number of profiles = 25
Description: Expendable Bathythermograph (XBT).
Water bottle stationsQuantity: number of deployments = 19
Description: Conductivity-Temperature-Depth (CTD) casts with recording of fluorescence, PAR, transmittance, lowered ADCP. Discrete Niskin bottle samples to prime MUDL net and for analyisis of pH, alkalinity, DIC, POM.
CTD stationsQuantity: number of deployments = 19
Description: Conductivity-Temperature-Depth (CTD) casts with recording of fluorescence, PAR, transmittance, lowered ADCP. Discrete Niskin bottle samples to prime MUDL net and for analyisis of pH, alkalinity, DIC, POM.
Current profiler (eg ADCP)Quantity: activity duration in days = 31
Description: Acoustic Doppler Current Profiler measurements 75 kHz.
Current profiler (eg ADCP)Quantity: number of deployments = 19
Description: Conductivity-Temperature-Depth (CTD) casts with recording of fluorescence, PAR, transmittance, lowered ADCP. Discrete Niskin bottle samples to prime MUDL net and for analyisis of pH, alkalinity, DIC, POM.
Other physical oceanographic measurementsQuantity: activity duration in days = 9
Description: SeaGlider autonomous underwater vehicle collected oceanographic parameters.
Chemical oceanography 
AlkalinityQuantity: number of deployments = 19
Description: Conductivity-Temperature-Depth (CTD) casts with recording of fluorescence, PAR, transmittance, lowered ADCP. Discrete Niskin bottle samples to prime MUDL net and for analyisis of pH, alkalinity, DIC, POM.
pHQuantity: number of deployments = 19
Description: Conductivity-Temperature-Depth (CTD) casts with recording of fluorescence, PAR, transmittance, lowered ADCP. Discrete Niskin bottle samples to prime MUDL net and for analyisis of pH, alkalinity, DIC, POM.
IsotopesQuantity: number of deployments = 16
Description: Rectangular Midwater Trawl 8 (RMT8) opening and closing nets, mesh size 5mm. Two nets at each event. Targeted hauls and oblique trawls for krill samples, macrozooplankton sampling, incubation experiments and stable isotope analysis.
Other chemical oceanographic measurementsQuantity: number of deployments = 19
Description: Conductivity-Temperature-Depth (CTD) casts with recording of fluorescence, PAR, transmittance, lowered ADCP. Discrete Niskin bottle samples to prime MUDL net and for analyisis of pH, alkalinity, DIC, POM.
Other chemical oceanographic measurementsQuantity: number of deployments = 8
Description: Multiple Opening and Closing Net and Environmental Sampling System (MOCNESS) 9 opening and closing nets, mesh size 0.3mm, in vertical profiles to a depth of 1000m. Samples to be analysed for taxonomy and CHN content.
Contamination 
Contaminants in organismsQuantity: number of deployments = 16
Description: Rectangular Midwater Trawl 8 (RMT8) opening and closing nets, mesh size 5mm. Two nets at each event. Targeted hauls and oblique trawls for krill samples, macrozooplankton sampling, incubation experiments and stable isotope analysis.
Contaminants in organismsQuantity: number of deployments = 13
Description: Bongo net, mesh size 0.1mm. Samples were preserved to be analysed for effects of nano- and microplastics on ocean zooplankton.
Contaminants in organismsQuantity: number of deployments = 15
Description: Neuston Micronet, mesh size 0.3mm.
Biology and fisheries 
Particulate organic matter (inc POC, PON)Quantity: number of samples = 7
Description: eDNA samples from underway water filtered with 0.6 µm filter cartridge.
Particulate organic matter (inc POC, PON)Quantity: number of deployments = 19
Description: Conductivity-Temperature-Depth (CTD) casts with recording of fluorescence, PAR, transmittance, lowered ADCP. Discrete Niskin bottle samples to prime MUDL net and for analyisis of pH, alkalinity, DIC, POM.
Biochemical measurements (eg lipids, amino acids)Quantity: number of deployments = 13
Description: Bongo net, mesh size 0.1mm. Samples were preserved to be analysed for effects of nano- and microplastics on ocean zooplankton.
PhytoplanktonQuantity: number of deployments = 19
Description: Conductivity-Temperature-Depth (CTD) casts with recording of fluorescence, PAR, transmittance, lowered ADCP. Discrete Niskin bottle samples to prime MUDL net and for analyisis of pH, alkalinity, DIC, POM.
ZooplanktonQuantity: number of deployments = 8
Description: Multiple Opening and Closing Net and Environmental Sampling System (MOCNESS) 9 opening and closing nets, mesh size 0.3mm, in vertical profiles to a depth of 1000m. Samples to be analysed for taxonomy and CHN content.
ZooplanktonQuantity: number of deployments = 19
Description: Conductivity-Temperature-Depth (CTD) casts with recording of fluorescence, PAR, transmittance, lowered ADCP. Discrete Niskin bottle samples to prime MUDL net and for analyisis of pH, alkalinity, DIC, POM.
ZooplanktonQuantity: number of deployments = 13
Description: Bongo net, mesh size 0.1mm. Samples were preserved to be analysed for effects of nano- and microplastics on ocean zooplankton.
ZooplanktonQuantity: number of deployments = 15
Description: Neuston Micronet, mesh size 0.3mm.
ZooplanktonQuantity: number of deployments = 16
Description: Rectangular Midwater Trawl 8 (RMT8) opening and closing nets, mesh size 5mm. Two nets at each event. Targeted hauls and oblique trawls for krill samples, macrozooplankton sampling, incubation experiments and stable isotope analysis.
ZooplanktonQuantity: number of deployments = 19
Description: Motion-compensated Upward and Downward Looking net (MUDL), mesh size 0.1 mm. Samples were preserved to be analysed for taxonomic composition.
NektonQuantity: number of deployments = 16
Description: Rectangular Midwater Trawl 8 (RMT8) opening and closing nets, mesh size 5mm. Two nets at each event. Targeted hauls and oblique trawls for krill samples, macrozooplankton sampling, incubation experiments and stable isotope analysis.
Eggs and larvaeQuantity: number of deployments = 16
Description: Rectangular Midwater Trawl 8 (RMT8) opening and closing nets, mesh size 5mm. Two nets at each event. Targeted hauls and oblique trawls for krill samples, macrozooplankton sampling, incubation experiments and stable isotope analysis.
Acoustic reflection on marine organisms.Quantity: activity duration in days = 31
Description: EK80 echosounder operated at 120 kHz.
Acoustic reflection on marine organisms.Quantity: activity duration in days = 31
Description: EK60 multifrequency acoustic backscatter collected at 38, 70 and 200 kHz. Instrument calibrated in Stromness Bay with known reference sphere.
Gear researchQuantity: number of deployments = 19
Description: Motion-compensated Upward and Downward Looking net (MUDL), mesh size 0.1 mm. Samples were preserved to be analysed for taxonomic composition.
Moorings, landers, buoys 
Physical oceanography 
CTD stations53° 47' 53" S  37° 55' 59" W — Site: WCB, deployed on 12/01/2018Water depth:Instrumentation: SBE CTD (~200m), RDI ADCP (~200m), Sediment trap (~250m), SonoVault acoustic listning (~250m), WBAT echosounder
CTD stations55° 14' 53" S  41° 13' 41" W — Site: P2, recovered on 16/01/2018Water depth:Instrumentation: SBE CTD (~200m and ~600m), RDI ADCP (~200m), Aquadopp current meter (~600m), Sediment trap (~600m and ~2000m)
CTD stations52° 48' 47" S  40° 10' 12" W — Site: P3, recovered on 03/01/2018Water depth:Instrumentation: SBE CTD (~200m and ~600m), RDI ADCP (~200m), Seaguard current meter & O2 sensor (~200m and ~600m), Sediment trap (~600m and ~2000m), SonoVault acoustic listning (~600m), PCO2 (~200m)
CTD stations53° 47' 53" S  37° 56' 6" W — Site: WCB, recovered on 06/01/2018Water depth:Instrumentation: SBE CTD (~200m), RDI ADCP (~200m), Sediment trap (~250m), SonoVault acoustic listning (~250m)
CTD stations52° 48' 11" S  40° 9' 29" W — Site: P3, deployed on 13/01/2018Water depth:Instrumentation: SBE CTD (~200m and ~600m), RDI ADCP (~200m), Seaguard current meter & O2 sensor (~200m and ~600m), Sediment trap (~600m and ~2000m), SAMI pH meter, PPS, Aquamonitor, PCO2 (~200m)
Current meters52° 48' 11" S  40° 9' 29" W — Site: P3, deployed on 13/01/2018Water depth:Instrumentation: SBE CTD (~200m and ~600m), RDI ADCP (~200m), Seaguard current meter & O2 sensor (~200m and ~600m), Sediment trap (~600m and ~2000m), SAMI pH meter, PPS, Aquamonitor, PCO2 (~200m)
Current meters55° 14' 53" S  41° 13' 41" W — Site: P2, recovered on 16/01/2018Water depth:Instrumentation: SBE CTD (~200m and ~600m), RDI ADCP (~200m), Aquadopp current meter (~600m), Sediment trap (~600m and ~2000m)
Current meters52° 48' 47" S  40° 10' 12" W — Site: P3, recovered on 03/01/2018Water depth:Instrumentation: SBE CTD (~200m and ~600m), RDI ADCP (~200m), Seaguard current meter & O2 sensor (~200m and ~600m), Sediment trap (~600m and ~2000m), SonoVault acoustic listning (~600m), PCO2 (~200m)
Current profiler (eg ADCP)52° 48' 47" S  40° 10' 12" W — Site: P3, recovered on 03/01/2018Water depth:Instrumentation: SBE CTD (~200m and ~600m), RDI ADCP (~200m), Seaguard current meter & O2 sensor (~200m and ~600m), Sediment trap (~600m and ~2000m), SonoVault acoustic listning (~600m), PCO2 (~200m)
Current profiler (eg ADCP)55° 14' 53" S  41° 13' 41" W — Site: P2, recovered on 16/01/2018Water depth:Instrumentation: SBE CTD (~200m and ~600m), RDI ADCP (~200m), Aquadopp current meter (~600m), Sediment trap (~600m and ~2000m)
Current profiler (eg ADCP)53° 47' 53" S  37° 55' 59" W — Site: WCB, deployed on 12/01/2018Water depth:Instrumentation: SBE CTD (~200m), RDI ADCP (~200m), Sediment trap (~250m), SonoVault acoustic listning (~250m), WBAT echosounder
Current profiler (eg ADCP)53° 47' 53" S  37° 56' 6" W — Site: WCB, recovered on 06/01/2018Water depth:Instrumentation: SBE CTD (~200m), RDI ADCP (~200m), Sediment trap (~250m), SonoVault acoustic listning (~250m)
Current profiler (eg ADCP)52° 48' 11" S  40° 9' 29" W — Site: P3, deployed on 13/01/2018Water depth:Instrumentation: SBE CTD (~200m and ~600m), RDI ADCP (~200m), Seaguard current meter & O2 sensor (~200m and ~600m), Sediment trap (~600m and ~2000m), SAMI pH meter, PPS, Aquamonitor, PCO2 (~200m)
Chemical oceanography 
Oxygen52° 48' 11" S  40° 9' 29" W — Site: P3, deployed on 13/01/2018Water depth:Instrumentation: SBE CTD (~200m and ~600m), RDI ADCP (~200m), Seaguard current meter & O2 sensor (~200m and ~600m), Sediment trap (~600m and ~2000m), SAMI pH meter, PPS, Aquamonitor, PCO2 (~200m)
Oxygen52° 48' 47" S  40° 10' 12" W — Site: P3, recovered on 03/01/2018Water depth:Instrumentation: SBE CTD (~200m and ~600m), RDI ADCP (~200m), Seaguard current meter & O2 sensor (~200m and ~600m), Sediment trap (~600m and ~2000m), SonoVault acoustic listning (~600m), PCO2 (~200m)
Carbon dioxide52° 48' 47" S  40° 10' 12" W — Site: P3, recovered on 03/01/2018Water depth:Instrumentation: SBE CTD (~200m and ~600m), RDI ADCP (~200m), Seaguard current meter & O2 sensor (~200m and ~600m), Sediment trap (~600m and ~2000m), SonoVault acoustic listning (~600m), PCO2 (~200m)
Carbon dioxide52° 48' 11" S  40° 9' 29" W — Site: P3, deployed on 13/01/2018Water depth:Instrumentation: SBE CTD (~200m and ~600m), RDI ADCP (~200m), Seaguard current meter & O2 sensor (~200m and ~600m), Sediment trap (~600m and ~2000m), SAMI pH meter, PPS, Aquamonitor, PCO2 (~200m)
pH52° 48' 11" S  40° 9' 29" W — Site: P3, deployed on 13/01/2018Water depth:Instrumentation: SBE CTD (~200m and ~600m), RDI ADCP (~200m), Seaguard current meter & O2 sensor (~200m and ~600m), Sediment trap (~600m and ~2000m), SAMI pH meter, PPS, Aquamonitor, PCO2 (~200m)
Other chemical oceanographic measurements52° 48' 11" S  40° 9' 29" W — Site: P3, deployed on 13/01/2018Water depth:Instrumentation: SBE CTD (~200m and ~600m), RDI ADCP (~200m), Seaguard current meter & O2 sensor (~200m and ~600m), Sediment trap (~600m and ~2000m), SAMI pH meter, PPS, Aquamonitor, PCO2 (~200m)
Biology and fisheries 
Sediment traps53° 47' 53" S  37° 55' 59" W — Site: WCB, deployed on 12/01/2018Water depth:Instrumentation: SBE CTD (~200m), RDI ADCP (~200m), Sediment trap (~250m), SonoVault acoustic listning (~250m), WBAT echosounder
Sediment traps53° 47' 53" S  37° 56' 6" W — Site: WCB, recovered on 06/01/2018Water depth:Instrumentation: SBE CTD (~200m), RDI ADCP (~200m), Sediment trap (~250m), SonoVault acoustic listning (~250m)
Sediment traps55° 14' 53" S  41° 13' 41" W — Site: P2, recovered on 16/01/2018Water depth:Instrumentation: SBE CTD (~200m and ~600m), RDI ADCP (~200m), Aquadopp current meter (~600m), Sediment trap (~600m and ~2000m)
Sediment traps52° 48' 11" S  40° 9' 29" W — Site: P3, deployed on 13/01/2018Water depth:Instrumentation: SBE CTD (~200m and ~600m), RDI ADCP (~200m), Seaguard current meter & O2 sensor (~200m and ~600m), Sediment trap (~600m and ~2000m), SAMI pH meter, PPS, Aquamonitor, PCO2 (~200m)
Sediment traps52° 48' 47" S  40° 10' 12" W — Site: P3, recovered on 03/01/2018Water depth:Instrumentation: SBE CTD (~200m and ~600m), RDI ADCP (~200m), Seaguard current meter & O2 sensor (~200m and ~600m), Sediment trap (~600m and ~2000m), SonoVault acoustic listning (~600m), PCO2 (~200m)
Acoustic reflection on marine organisms.53° 47' 53" S  37° 55' 59" W — Site: WCB, deployed on 12/01/2018Water depth:Instrumentation: SBE CTD (~200m), RDI ADCP (~200m), Sediment trap (~250m), SonoVault acoustic listning (~250m), WBAT echosounder
Other biological/fisheries measurement52° 48' 47" S  40° 10' 12" W — Site: P3, recovered on 03/01/2018Water depth:Instrumentation: SBE CTD (~200m and ~600m), RDI ADCP (~200m), Seaguard current meter & O2 sensor (~200m and ~600m), Sediment trap (~600m and ~2000m), SonoVault acoustic listning (~600m), PCO2 (~200m)
Other biological/fisheries measurement53° 47' 53" S  37° 56' 6" W — Site: WCB, recovered on 06/01/2018Water depth:Instrumentation: SBE CTD (~200m), RDI ADCP (~200m), Sediment trap (~250m), SonoVault acoustic listning (~250m)
Other biological/fisheries measurement52° 48' 11" S  40° 9' 29" W — Site: P3, deployed on 13/01/2018Water depth:Instrumentation: SBE CTD (~200m and ~600m), RDI ADCP (~200m), Seaguard current meter & O2 sensor (~200m and ~600m), Sediment trap (~600m and ~2000m), SAMI pH meter, PPS, Aquamonitor, PCO2 (~200m)
Other biological/fisheries measurement53° 47' 53" S  37° 55' 59" W — Site: WCB, deployed on 12/01/2018Water depth:Instrumentation: SBE CTD (~200m), RDI ADCP (~200m), Sediment trap (~250m), SonoVault acoustic listning (~250m), WBAT echosounder
Data held at BODC Get data
Discrete samples 
19  CTD frame plus rosette sampler
25  Expendable Bathythermograph