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RRS James Clark Ross JR18005

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS James Clark Ross (74JC)
Cruise identifierJR18005
Cruise period2019-02-21 — 2019-04-15
StatusCompleted
Port of departurePunta Arenas, Chile
Port of returnMare Harbour, Falkland Islands (Malvinas)
PurposeResearch
ObjectivesJR18005 (ANDREXII) was a hydrographic and biogeochemical voyage aboard the Royal Research Ship James Clark Ross occupying ~100 full depth CTD stations extending from the tip of the Antarctic Peninsula to 30oE. ANDREXII repeated the track of two earlier voyages in 2009/10 and forms part of the ORCHESTRA (Ocean Regulation of Climate by Heat and Carbon Sequestration and Transports) multi-centre collaboration by NERC examining heat and carbon uptake in the South Atlantic and Southern Ocean. In addition CFC/SF6 measurements were taken for the TICTOC (Transient tracer-based Investigation of Circulation and Thermal Ocean Change) NERC large grant in partnership with ORCHESTRA. The voyage departed Punta Arenas on the 21st of February 2019 and was overflown twice by the BAS MASIN meteorological aircraft on the 23rd of February in order to conduct calibration measurements.
The JCR then called at Stanley on the 24th for half a day to transfer cargo before heading south to the tip of the Antarctic Peninsula. CTD operations commenced on the 28th of February and continued uninterrupted towards the east until the 10th of March. At this point the JCR diverted north over the South Sandwich Trench to conduct swathing operations and a CTD section across the 'shallow' sills revealed by the survey. Further deep stations in the trench were postponed until the end of the voyage due to concerns about the impact of extreme depth on the conducting wire. From the 13th of March the JCR returned to the ANDREXII hydrographic line. CTDs 73-78 were not successfully occupied on the eastward leg due to a technical fault with the CTD wire. This was rectified and CTDs 78-92 were occupied without break between 18th-23rd March. Poor weather along the planned stations between station 93 and 30oE forced the diversion of the line southwards, eventually reaching 30oE at 60.5oS on the 28th of March. Three stations were occupied on 30oE to intersect with the I6S line being occupied by US partners in April 2019 for calibration purposes.
The JCR then returned west to the missed stations 78-73 and reoccupied them (dropping 74 due to time constraints). A winch failure immediately upon completing the missed stations forced suspension of deep CTD operations and the cancellation of the planned extremely deep stations in the South Sandwich Trench. The JCR then proceeded east, recovering a BAS Slocum glider, deployed on JR18004, on the 9th of April. Finally the voyage occupied a single shallow CTD station within the growing sea-ice south-west of the South Orkney Islands on the 11th of April to examine air-sea fluxes before arriving at Mare Harbour on the 15th of April.
Chief scientistAndrew J S Meijers (British Antarctic Survey)
ProjectOcean Regulation of Climate by Heat and Carbon Sequestration and Transports (ORCHESTRA)
Cruise reportRRS James Clark Ross JR18005 cruise report jr18005.pdf (7.58 MB) 
Ocean/sea areas 
GeneralSouthern Ocean
Unknown
SpecificSouth Scotia Sea, South Scotia Ridge, South Sandwich Trench, northern Weddell Sea.
Track chartsRRS James Clark Ross JR18005 cruise track — jr18005trk.pdf (0.26 MB) 
Measurements 
Physical oceanography 
Surface measurements underway (T,S)Quantity: track kilometres = 14800
Description: Continous underway water sampling (+ salinity bottle samples, every ~4 hours when underway).
Water bottle stationsQuantity: number of stations = 99
Description: CTD casts. Continuous recordings conductivity, temperature, depth, fluorescence, PAR, transmittance.
CTD stationsQuantity: number of stations = 99
Description: CTD casts. Continuous recordings conductivity, temperature, depth, fluorescence, PAR, transmittance.
Subsurface temperature and salinity measurementsQuantity: number of stations = 6
Description: CTD water analysis - calibration measurements of soccom float pH/TA, POC/HPLC
Current profiler (eg ADCP)Quantity: number of stations = 98
Description: Lowered Acoustic Doppler Current Profiler mounted on CTD frame.
Current profiler (eg ADCP)Quantity: track kilometres = 14800
Description: Ship mounted Acoustic Doppler Current Profiler measurements (75 kHz)
Chemical oceanography 
OxygenQuantity: number of stations = 6
Description: CTD water analysis - calibration measurements of soccom float pH/TA, POC/HPLC
OxygenQuantity: number of stations = 98
Description: CTD water analysis- dissolved oxygen bottle samples
Carbon dioxideQuantity: track kilometres = 14800
Description: Underway pCO2 from seawater, using 'fast CO2' method
Carbon dioxideQuantity: track kilometres = 14800
Description: Underway pCO2 from seawter, using standard 'showerhead' method.
Carbon dioxideQuantity: track kilometres = 14800
Description: Underway CO2 from atmosphere
Carbon dioxideQuantity: number of stations = 98
Description: CTD water analysis - DIC and pH
PhosphateQuantity: number of stations = 99
Description: Nutrients sampled from CTD bottles
PhosphateQuantity: number of samples = 60
Description: Nutrients and Nutrient isotope from underway seawater. d13C, d15N and d30Si
NitrateQuantity: number of stations = 6
Description: CTD water analysis - calibration measurements of soccom float pH/TA, POC/HPLC
NitrateQuantity: number of stations = 99
Description: Nutrients sampled from CTD bottles
NitrateQuantity: number of samples = 60
Description: Nutrients and Nutrient isotope from underway seawater. d13C, d15N and d30Si
NitriteQuantity: number of samples = 60
Description: Nutrients and Nutrient isotope from underway seawater. d13C, d15N and d30Si
NitriteQuantity: number of stations = 99
Description: Nutrients sampled from CTD bottles
AmmoniaQuantity: number of stations = 99
Description: Nutrients sampled from CTD bottles
AmmoniaQuantity: number of samples = 60
Description: Nutrients and Nutrient isotope from underway seawater. d13C, d15N and d30Si
SilicateQuantity: number of stations = 99
Description: Nutrients sampled from CTD bottles
SilicateQuantity: number of samples = 60
Description: Nutrients and Nutrient isotope from underway seawater. d13C, d15N and d30Si
pHQuantity: number of stations = 6
Description: CTD water analysis - calibration measurements of soccom float pH/TA, POC/HPLC
pHQuantity: number of stations = 98
Description: CTD water analysis - DIC and pH
IsotopesQuantity: number of stations = 97
Description: CTD water analysis - d18O and carbon 13 isotopes sampled though water column.
IsotopesQuantity: number of stations = 25
Description: CTD water analysis - C14, bomb radiocarbon sampled through water column.
IsotopesQuantity: number of samples = 60
Description: Nutrients and Nutrient isotope from underway seawater. d13C, d15N and d30Si
Other chemical oceanographic measurementsQuantity: number of stations = 98
Description: CTD water analysis - CFCs and SF6
Other chemical oceanographic measurementsQuantity: number of stations = 99
Description: CTD water analysis - Salinity. Sampled through water column.
Other chemical oceanographic measurementsQuantity: track kilometres = 14800
Description: OVOCs continously from underway air and seawater
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of stations = 6
Description: CTD water analysis - calibration measurements of soccom float pH/TA, POC/HPLC
Biochemical measurements (eg lipids, amino acids)Quantity: number of stations = 28
Description: CTD water analysis - Environmental DNA.
Meteorology 
Routine standard measurementsQuantity: track kilometres = 14800
Description: Underway meterological measurements
Geology and geophysics 
Multi-beam echosoundingQuantity: track kilometres = 14800
Description: EM122 swath bathymetry data
Moorings, landers, buoys 
Physical oceanography 
Subsurface temperature and salinity measurements60° 39' 3" S  42° 9' 10" W — Deep Arvor float. Bottom tracking ARGO style measurements with ADCP and capable of >4000 m dives.
Subsurface temperature and salinity measurements60° 38' 59" S  42° 9' 7" W — Deep Arvor float. Bottom tracking ARGO style measurements with ADCP and capable of >4000 m dives.
Subsurface temperature and salinity measurements60° 49' 37" S  27° 13' 44" W — SOCCOM float. Biogeochemical Argo analogue.
Subsurface temperature and salinity measurements57° 32' 13" S  15° 22' 30" E — SOCCOM float. Biogeochemical Argo analogue.
Subsurface temperature and salinity measurements60° 19' 12" S  30° 57' 43" W — SOCCOM float. Biogeochemical Argo analogue.
Subsurface temperature and salinity measurements60° 50' 52" S  30° 2' 2" E — SOCCOM float. Biogeochemical Argo analogue.
Subsurface temperature and salinity measurements60° 8' 52" S  48° 7' 30" W — SOCCOM float. Biogeochemical Argo analogue.
Subsurface temperature and salinity measurements60° 39' 7" S  42° 8' 59" W — SOCCOM float. Biogeochemical Argo analogue.
Current profiler (eg ADCP)60° 39' 3" S  42° 9' 10" W — Deep Arvor float. Bottom tracking ARGO style measurements with ADCP and capable of >4000 m dives.
Current profiler (eg ADCP)60° 38' 59" S  42° 9' 7" W — Deep Arvor float. Bottom tracking ARGO style measurements with ADCP and capable of >4000 m dives.
Neutrally buoyant floats60° 8' 52" S  48° 7' 30" W — SOCCOM float. Biogeochemical Argo analogue.
Neutrally buoyant floats60° 38' 59" S  42° 9' 7" W — Deep Arvor float. Bottom tracking ARGO style measurements with ADCP and capable of >4000 m dives.
Neutrally buoyant floats57° 32' 13" S  15° 22' 30" E — SOCCOM float. Biogeochemical Argo analogue.
Neutrally buoyant floats60° 49' 37" S  27° 13' 44" W — SOCCOM float. Biogeochemical Argo analogue.
Neutrally buoyant floats60° 39' 7" S  42° 8' 59" W — SOCCOM float. Biogeochemical Argo analogue.
Neutrally buoyant floats60° 19' 12" S  30° 57' 43" W — SOCCOM float. Biogeochemical Argo analogue.
Neutrally buoyant floats60° 50' 52" S  30° 2' 2" E — SOCCOM float. Biogeochemical Argo analogue.
Neutrally buoyant floats60° 39' 3" S  42° 9' 10" W — Deep Arvor float. Bottom tracking ARGO style measurements with ADCP and capable of >4000 m dives.
Chemical oceanography 
Oxygen60° 39' 7" S  42° 8' 59" W — SOCCOM float. Biogeochemical Argo analogue.
Oxygen60° 19' 12" S  30° 57' 43" W — SOCCOM float. Biogeochemical Argo analogue.
Oxygen60° 50' 52" S  30° 2' 2" E — SOCCOM float. Biogeochemical Argo analogue.
Oxygen60° 49' 37" S  27° 13' 44" W — SOCCOM float. Biogeochemical Argo analogue.
Oxygen60° 8' 52" S  48° 7' 30" W — SOCCOM float. Biogeochemical Argo analogue.
Oxygen57° 32' 13" S  15° 22' 30" E — SOCCOM float. Biogeochemical Argo analogue.
Nitrate60° 19' 12" S  30° 57' 43" W — SOCCOM float. Biogeochemical Argo analogue.
Nitrate57° 32' 13" S  15° 22' 30" E — SOCCOM float. Biogeochemical Argo analogue.
Nitrate60° 39' 7" S  42° 8' 59" W — SOCCOM float. Biogeochemical Argo analogue.
Nitrate60° 8' 52" S  48° 7' 30" W — SOCCOM float. Biogeochemical Argo analogue.
Nitrate60° 49' 37" S  27° 13' 44" W — SOCCOM float. Biogeochemical Argo analogue.
Nitrate60° 50' 52" S  30° 2' 2" E — SOCCOM float. Biogeochemical Argo analogue.
pH57° 32' 13" S  15° 22' 30" E — SOCCOM float. Biogeochemical Argo analogue.
pH60° 49' 37" S  27° 13' 44" W — SOCCOM float. Biogeochemical Argo analogue.
pH60° 19' 12" S  30° 57' 43" W — SOCCOM float. Biogeochemical Argo analogue.
pH60° 8' 52" S  48° 7' 30" W — SOCCOM float. Biogeochemical Argo analogue.
pH60° 39' 7" S  42° 8' 59" W — SOCCOM float. Biogeochemical Argo analogue.
pH60° 50' 52" S  30° 2' 2" E — SOCCOM float. Biogeochemical Argo analogue.
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)60° 19' 12" S  30° 57' 43" W — SOCCOM float. Biogeochemical Argo analogue.
Phytoplankton pigs (eg chlorophyll, fluorescence)60° 50' 52" S  30° 2' 2" E — SOCCOM float. Biogeochemical Argo analogue.
Phytoplankton pigs (eg chlorophyll, fluorescence)60° 8' 52" S  48° 7' 30" W — SOCCOM float. Biogeochemical Argo analogue.
Phytoplankton pigs (eg chlorophyll, fluorescence)60° 39' 7" S  42° 8' 59" W — SOCCOM float. Biogeochemical Argo analogue.
Phytoplankton pigs (eg chlorophyll, fluorescence)60° 49' 37" S  27° 13' 44" W — SOCCOM float. Biogeochemical Argo analogue.
Phytoplankton pigs (eg chlorophyll, fluorescence)57° 32' 13" S  15° 22' 30" E — SOCCOM float. Biogeochemical Argo analogue.
Data held at BODC 
Discrete samples 
106  CTD frame plus rosette sampler