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RRS James Clark Ross JR18002

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS James Clark Ross (74JC)
Cruise identifierJR18002
Cruise period2018-11-03 — 2018-11-22
StatusCompleted
Port of departureMare Harbour, Falkland Islands (Malvinas)
Port of returnStanley, Falkland Islands (Malvinas)
PurposeResearch
ObjectivesThe 24th complete occupation of the Drake Passage section SR1b obtained full-depth temperature, salinity, dissolved oxygen, and lowered ADCP velocity profiles at 29 stations between Burdwood Bank and Elephant Island, along with water column samples of salinity, dissolved oxygen, nutrients, carbonate system parameters, oxygen and carbon isotopes, and CFCs and SF6, and underway surface ocean and meteorological data and vessel mounted current measurements. The aims of these decadal repeat hydrographic measurements are to monitor the Antarctic Circumpolar Current’s properties and transports and contribute to understanding the Southern Ocean's role in heat and carbon storage and transports and the contribution of ocean circulation to regional patterns of warming and sea level rise. They contribute to the international Global Ocean Ship-based Hydrographic Investigations Program (GO-SHIP) and were funded by NERC through the Ocean Regulation of Climate by Heat and Carbon Sequestration and Transports (ORCHESTRA) National Capability programme and Transient tracer-based Investigation of Circulation and Thermal Ocean Change (TICTOC) large grant. At approximately half the stations large-volume samples were taken to measure radium and actinium isotopes to constrain iron fluxes as part of the NERC-funded RaCE:TraX project. The cruise also included opportunistic measurements of water column microplastics (funded by the Collaborative Antarctic Science Scheme) and nutrient isotopes, and experiments on phytoplankton nutrient limitation.
Chief scientistYvonne L Firing (National Oceanography Centre, Southampton)
ProjectORCHESTRA, TICTOC, RaCE:TraX
Cruise reportRRS James Clark Ross JR18002 cruise report jr18002.pdf (23.63 MB) 
Ocean/sea areas 
GeneralSouth West Atlantic Ocean (limit 20W)
Southern Ocean
SpecificDrake Passage/Scotia Sea (between Burdwood Bank and Elephant Island)
Track chartsRRS James Clark Ross JR18002 cruise track — jr18002trk.pdf (0.42 MB) 
Measurements 
Physical oceanography 
Water bottle stationsQuantity: number of stations = 33
Description: CTD/LADCP casts and water samples [includes: 2 test casts (1 aborted), 1 repeated station, 1 CFCs bottle blank cast]. CFCs, SF6, Dissolved oxygen, DIC, alkalinity, nitrate, nitrite, phosphate, silicate and salinity were collected from all casts and all depths. Microplastics were sampled at 17 stations, with up to 3 samples per cast. C14 was sampled at 13 stations with up to 24 samples per cast. DNA was sampled at 16 stations with up to 4 samples per cast. POC/PON was sampled at 10 stations with up to 3 samples per cast. DON was collected at 19 stations with up to 6 samples per cast. d15N-Nitrate was collected at 21 stations with up to 20 samples per cast. d30Si-Silicate was collected at 18 stations with up to 12 samples per cast.
CTD stationsQuantity: number of stations = 33
Description: CTD/LADCP casts and water samples [includes: 2 test casts (1 aborted), 1 repeated station, 1 CFCs bottle blank cast]. CFCs, SF6, Dissolved oxygen, DIC, alkalinity, nitrate, nitrite, phosphate, silicate and salinity were collected from all casts and all depths. Microplastics were sampled at 17 stations, with up to 3 samples per cast. C14 was sampled at 13 stations with up to 24 samples per cast. DNA was sampled at 16 stations with up to 4 samples per cast. POC/PON was sampled at 10 stations with up to 3 samples per cast. DON was collected at 19 stations with up to 6 samples per cast. d15N-Nitrate was collected at 21 stations with up to 20 samples per cast. d30Si-Silicate was collected at 18 stations with up to 12 samples per cast.
Current profiler (eg ADCP)Quantity: activity duration in days = 20
Description: Routine underway measurements. Includes underway salinity samples (taken approximately every 4 hours).
Current profiler (eg ADCP)Quantity: number of stations = 33
Description: CTD/LADCP casts and water samples [includes: 2 test casts (1 aborted), 1 repeated station, 1 CFCs bottle blank cast]. CFCs, SF6, Dissolved oxygen, DIC, alkalinity, nitrate, nitrite, phosphate, silicate and salinity were collected from all casts and all depths. Microplastics were sampled at 17 stations, with up to 3 samples per cast. C14 was sampled at 13 stations with up to 24 samples per cast. DNA was sampled at 16 stations with up to 4 samples per cast. POC/PON was sampled at 10 stations with up to 3 samples per cast. DON was collected at 19 stations with up to 6 samples per cast. d15N-Nitrate was collected at 21 stations with up to 20 samples per cast. d30Si-Silicate was collected at 18 stations with up to 12 samples per cast.
Chemical oceanography 
OxygenQuantity: number of stations = 33
Description: CTD/LADCP casts and water samples [includes: 2 test casts (1 aborted), 1 repeated station, 1 CFCs bottle blank cast]. CFCs, SF6, Dissolved oxygen, DIC, alkalinity, nitrate, nitrite, phosphate, silicate and salinity were collected from all casts and all depths. Microplastics were sampled at 17 stations, with up to 3 samples per cast. C14 was sampled at 13 stations with up to 24 samples per cast. DNA was sampled at 16 stations with up to 4 samples per cast. POC/PON was sampled at 10 stations with up to 3 samples per cast. DON was collected at 19 stations with up to 6 samples per cast. d15N-Nitrate was collected at 21 stations with up to 20 samples per cast. d30Si-Silicate was collected at 18 stations with up to 12 samples per cast.
Carbon dioxideQuantity: number of stations = 33
Description: CTD/LADCP casts and water samples [includes: 2 test casts (1 aborted), 1 repeated station, 1 CFCs bottle blank cast]. CFCs, SF6, Dissolved oxygen, DIC, alkalinity, nitrate, nitrite, phosphate, silicate and salinity were collected from all casts and all depths. Microplastics were sampled at 17 stations, with up to 3 samples per cast. C14 was sampled at 13 stations with up to 24 samples per cast. DNA was sampled at 16 stations with up to 4 samples per cast. POC/PON was sampled at 10 stations with up to 3 samples per cast. DON was collected at 19 stations with up to 6 samples per cast. d15N-Nitrate was collected at 21 stations with up to 20 samples per cast. d30Si-Silicate was collected at 18 stations with up to 12 samples per cast.
PhosphateQuantity: number of stations = 33
Description: CTD/LADCP casts and water samples [includes: 2 test casts (1 aborted), 1 repeated station, 1 CFCs bottle blank cast]. CFCs, SF6, Dissolved oxygen, DIC, alkalinity, nitrate, nitrite, phosphate, silicate and salinity were collected from all casts and all depths. Microplastics were sampled at 17 stations, with up to 3 samples per cast. C14 was sampled at 13 stations with up to 24 samples per cast. DNA was sampled at 16 stations with up to 4 samples per cast. POC/PON was sampled at 10 stations with up to 3 samples per cast. DON was collected at 19 stations with up to 6 samples per cast. d15N-Nitrate was collected at 21 stations with up to 20 samples per cast. d30Si-Silicate was collected at 18 stations with up to 12 samples per cast.
PhosphateQuantity: number of stations = 35
Description: Towfish surface waters samples - macronutrient concentrations, chlorophyll-a concentrations, FRRf, analytical flow cytometry, HPLC pigments, particulate organic carbon, biogenic silica
NitrateQuantity: number of stations = 33
Description: CTD/LADCP casts and water samples [includes: 2 test casts (1 aborted), 1 repeated station, 1 CFCs bottle blank cast]. CFCs, SF6, Dissolved oxygen, DIC, alkalinity, nitrate, nitrite, phosphate, silicate and salinity were collected from all casts and all depths. Microplastics were sampled at 17 stations, with up to 3 samples per cast. C14 was sampled at 13 stations with up to 24 samples per cast. DNA was sampled at 16 stations with up to 4 samples per cast. POC/PON was sampled at 10 stations with up to 3 samples per cast. DON was collected at 19 stations with up to 6 samples per cast. d15N-Nitrate was collected at 21 stations with up to 20 samples per cast. d30Si-Silicate was collected at 18 stations with up to 12 samples per cast.
NitrateQuantity: number of stations = 35
Description: Towfish surface waters samples - macronutrient concentrations, chlorophyll-a concentrations, FRRf, analytical flow cytometry, HPLC pigments, particulate organic carbon, biogenic silica
NitriteQuantity: number of stations = 33
Description: CTD/LADCP casts and water samples [includes: 2 test casts (1 aborted), 1 repeated station, 1 CFCs bottle blank cast]. CFCs, SF6, Dissolved oxygen, DIC, alkalinity, nitrate, nitrite, phosphate, silicate and salinity were collected from all casts and all depths. Microplastics were sampled at 17 stations, with up to 3 samples per cast. C14 was sampled at 13 stations with up to 24 samples per cast. DNA was sampled at 16 stations with up to 4 samples per cast. POC/PON was sampled at 10 stations with up to 3 samples per cast. DON was collected at 19 stations with up to 6 samples per cast. d15N-Nitrate was collected at 21 stations with up to 20 samples per cast. d30Si-Silicate was collected at 18 stations with up to 12 samples per cast.
NitriteQuantity: number of stations = 35
Description: Towfish surface waters samples - macronutrient concentrations, chlorophyll-a concentrations, FRRf, analytical flow cytometry, HPLC pigments, particulate organic carbon, biogenic silica
SilicateQuantity: number of stations = 33
Description: CTD/LADCP casts and water samples [includes: 2 test casts (1 aborted), 1 repeated station, 1 CFCs bottle blank cast]. CFCs, SF6, Dissolved oxygen, DIC, alkalinity, nitrate, nitrite, phosphate, silicate and salinity were collected from all casts and all depths. Microplastics were sampled at 17 stations, with up to 3 samples per cast. C14 was sampled at 13 stations with up to 24 samples per cast. DNA was sampled at 16 stations with up to 4 samples per cast. POC/PON was sampled at 10 stations with up to 3 samples per cast. DON was collected at 19 stations with up to 6 samples per cast. d15N-Nitrate was collected at 21 stations with up to 20 samples per cast. d30Si-Silicate was collected at 18 stations with up to 12 samples per cast.
SilicateQuantity: number of stations = 35
Description: Towfish surface waters samples - macronutrient concentrations, chlorophyll-a concentrations, FRRf, analytical flow cytometry, HPLC pigments, particulate organic carbon, biogenic silica
AlkalinityQuantity: number of stations = 33
Description: CTD/LADCP casts and water samples [includes: 2 test casts (1 aborted), 1 repeated station, 1 CFCs bottle blank cast]. CFCs, SF6, Dissolved oxygen, DIC, alkalinity, nitrate, nitrite, phosphate, silicate and salinity were collected from all casts and all depths. Microplastics were sampled at 17 stations, with up to 3 samples per cast. C14 was sampled at 13 stations with up to 24 samples per cast. DNA was sampled at 16 stations with up to 4 samples per cast. POC/PON was sampled at 10 stations with up to 3 samples per cast. DON was collected at 19 stations with up to 6 samples per cast. d15N-Nitrate was collected at 21 stations with up to 20 samples per cast. d30Si-Silicate was collected at 18 stations with up to 12 samples per cast.
Trace elementsQuantity: number of stations = 15
Description: Radioisotopes CTD/LADCP casts and water samples + surface towfish samples (2 stations). 40 casts in total
RadioactivityQuantity: number of stations = 33
Description: CTD/LADCP casts and water samples [includes: 2 test casts (1 aborted), 1 repeated station, 1 CFCs bottle blank cast]. CFCs, SF6, Dissolved oxygen, DIC, alkalinity, nitrate, nitrite, phosphate, silicate and salinity were collected from all casts and all depths. Microplastics were sampled at 17 stations, with up to 3 samples per cast. C14 was sampled at 13 stations with up to 24 samples per cast. DNA was sampled at 16 stations with up to 4 samples per cast. POC/PON was sampled at 10 stations with up to 3 samples per cast. DON was collected at 19 stations with up to 6 samples per cast. d15N-Nitrate was collected at 21 stations with up to 20 samples per cast. d30Si-Silicate was collected at 18 stations with up to 12 samples per cast.
IsotopesQuantity: number of stations = 33
Description: CTD/LADCP casts and water samples [includes: 2 test casts (1 aborted), 1 repeated station, 1 CFCs bottle blank cast]. CFCs, SF6, Dissolved oxygen, DIC, alkalinity, nitrate, nitrite, phosphate, silicate and salinity were collected from all casts and all depths. Microplastics were sampled at 17 stations, with up to 3 samples per cast. C14 was sampled at 13 stations with up to 24 samples per cast. DNA was sampled at 16 stations with up to 4 samples per cast. POC/PON was sampled at 10 stations with up to 3 samples per cast. DON was collected at 19 stations with up to 6 samples per cast. d15N-Nitrate was collected at 21 stations with up to 20 samples per cast. d30Si-Silicate was collected at 18 stations with up to 12 samples per cast.
IsotopesQuantity: number of stations = 15
Description: Radioisotopes CTD/LADCP casts and water samples + surface towfish samples (2 stations). 40 casts in total
Other chemical oceanographic measurementsQuantity: activity duration in days = 20
Description: Routine underway measurements. Includes underway salinity samples (taken approximately every 4 hours).
Other chemical oceanographic measurementsQuantity: number of stations = 33
Description: CTD/LADCP casts and water samples [includes: 2 test casts (1 aborted), 1 repeated station, 1 CFCs bottle blank cast]. CFCs, SF6, Dissolved oxygen, DIC, alkalinity, nitrate, nitrite, phosphate, silicate and salinity were collected from all casts and all depths. Microplastics were sampled at 17 stations, with up to 3 samples per cast. C14 was sampled at 13 stations with up to 24 samples per cast. DNA was sampled at 16 stations with up to 4 samples per cast. POC/PON was sampled at 10 stations with up to 3 samples per cast. DON was collected at 19 stations with up to 6 samples per cast. d15N-Nitrate was collected at 21 stations with up to 20 samples per cast. d30Si-Silicate was collected at 18 stations with up to 12 samples per cast.
Contamination 
Other contaminant measurementsQuantity: number of stations = 33
Description: CTD/LADCP casts and water samples [includes: 2 test casts (1 aborted), 1 repeated station, 1 CFCs bottle blank cast]. CFCs, SF6, Dissolved oxygen, DIC, alkalinity, nitrate, nitrite, phosphate, silicate and salinity were collected from all casts and all depths. Microplastics were sampled at 17 stations, with up to 3 samples per cast. C14 was sampled at 13 stations with up to 24 samples per cast. DNA was sampled at 16 stations with up to 4 samples per cast. POC/PON was sampled at 10 stations with up to 3 samples per cast. DON was collected at 19 stations with up to 6 samples per cast. d15N-Nitrate was collected at 21 stations with up to 20 samples per cast. d30Si-Silicate was collected at 18 stations with up to 12 samples per cast.
Biology and fisheries 
Primary productivityQuantity: number of stations = 35
Description: Towfish surface waters samples - macronutrient concentrations, chlorophyll-a concentrations, FRRf, analytical flow cytometry, HPLC pigments, particulate organic carbon, biogenic silica
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of stations = 35
Description: Towfish surface waters samples - macronutrient concentrations, chlorophyll-a concentrations, FRRf, analytical flow cytometry, HPLC pigments, particulate organic carbon, biogenic silica
Particulate organic matter (inc POC, PON)Quantity: number of stations = 33
Description: CTD/LADCP casts and water samples [includes: 2 test casts (1 aborted), 1 repeated station, 1 CFCs bottle blank cast]. CFCs, SF6, Dissolved oxygen, DIC, alkalinity, nitrate, nitrite, phosphate, silicate and salinity were collected from all casts and all depths. Microplastics were sampled at 17 stations, with up to 3 samples per cast. C14 was sampled at 13 stations with up to 24 samples per cast. DNA was sampled at 16 stations with up to 4 samples per cast. POC/PON was sampled at 10 stations with up to 3 samples per cast. DON was collected at 19 stations with up to 6 samples per cast. d15N-Nitrate was collected at 21 stations with up to 20 samples per cast. d30Si-Silicate was collected at 18 stations with up to 12 samples per cast.
Dissolved organic matter (inc DOC)Quantity: number of stations = 33
Description: CTD/LADCP casts and water samples [includes: 2 test casts (1 aborted), 1 repeated station, 1 CFCs bottle blank cast]. CFCs, SF6, Dissolved oxygen, DIC, alkalinity, nitrate, nitrite, phosphate, silicate and salinity were collected from all casts and all depths. Microplastics were sampled at 17 stations, with up to 3 samples per cast. C14 was sampled at 13 stations with up to 24 samples per cast. DNA was sampled at 16 stations with up to 4 samples per cast. POC/PON was sampled at 10 stations with up to 3 samples per cast. DON was collected at 19 stations with up to 6 samples per cast. d15N-Nitrate was collected at 21 stations with up to 20 samples per cast. d30Si-Silicate was collected at 18 stations with up to 12 samples per cast.
PhytoplanktonQuantity: number of stations = 35
Description: Towfish surface waters samples - macronutrient concentrations, chlorophyll-a concentrations, FRRf, analytical flow cytometry, HPLC pigments, particulate organic carbon, biogenic silica
Other biological/fisheries measurementQuantity: number of stations = 35
Description: Towfish surface waters samples - macronutrient concentrations, chlorophyll-a concentrations, FRRf, analytical flow cytometry, HPLC pigments, particulate organic carbon, biogenic silica
Meteorology 
Routine standard measurementsQuantity: activity duration in days = 20
Description: Routine underway measurements. Includes underway salinity samples (taken approximately every 4 hours).
Geology and geophysics 
Single-beam echosoundingQuantity: activity duration in days = 20
Description: Routine underway measurements. Includes underway salinity samples (taken approximately every 4 hours).
Multi-beam echosoundingQuantity: activity duration in days = 20
Description: Routine underway measurements. Includes underway salinity samples (taken approximately every 4 hours).
Data held at BODC Get data
Discrete samples 
71  CTD frame plus rosette sampler