RRS James Clark Ross JR18005
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | RRS James Clark Ross (74JC) |
| Cruise identifier | JR18005 |
| Cruise period | 2019-02-21 — 2019-04-15 |
| Status | Completed |
| Port of departure | Punta Arenas, Chile |
| Port of return | Mare Harbour, Falkland Islands (Malvinas) |
| Purpose | Research |
| Objectives | JR18005 (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 scientist | Andrew J S Meijers (British Antarctic Survey) |
| Project | Ocean Regulation of Climate by Heat and Carbon Sequestration and Transports (ORCHESTRA) |
| Cruise report |  (7.58 MB) |
| Ocean/sea areas | |
| General | Southern Ocean Unknown |
| Specific | South Scotia Sea, South Scotia Ridge, South Sandwich Trench, northern Weddell Sea. |
| Track charts | (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 stations | Quantity: number of stations = 99 Description: CTD casts. Continuous recordings conductivity, temperature, depth, fluorescence, PAR, transmittance. |
| CTD stations | Quantity: number of stations = 99 Description: CTD casts. Continuous recordings conductivity, temperature, depth, fluorescence, PAR, transmittance. |
| Subsurface temperature and salinity measurements | Quantity: 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 | |
| Oxygen | Quantity: number of stations = 6 Description: CTD water analysis - calibration measurements of soccom float pH/TA, POC/HPLC |
| Oxygen | Quantity: number of stations = 98 Description: CTD water analysis- dissolved oxygen bottle samples |
| Carbon dioxide | Quantity: track kilometres = 14800 Description: Underway pCO2 from seawater, using 'fast CO2' method |
| Carbon dioxide | Quantity: track kilometres = 14800 Description: Underway pCO2 from seawter, using standard 'showerhead' method. |
| Carbon dioxide | Quantity: track kilometres = 14800 Description: Underway CO2 from atmosphere |
| Carbon dioxide | Quantity: number of stations = 98 Description: CTD water analysis - DIC and pH |
| Phosphate | Quantity: number of stations = 99 Description: Nutrients sampled from CTD bottles |
| Phosphate | Quantity: number of samples = 60 Description: Nutrients and Nutrient isotope from underway seawater. d13C, d15N and d30Si |
| Nitrate | Quantity: number of stations = 6 Description: CTD water analysis - calibration measurements of soccom float pH/TA, POC/HPLC |
| Nitrate | Quantity: number of stations = 99 Description: Nutrients sampled from CTD bottles |
| Nitrate | Quantity: number of samples = 60 Description: Nutrients and Nutrient isotope from underway seawater. d13C, d15N and d30Si |
| Nitrite | Quantity: number of samples = 60 Description: Nutrients and Nutrient isotope from underway seawater. d13C, d15N and d30Si |
| Nitrite | Quantity: number of stations = 99 Description: Nutrients sampled from CTD bottles |
| Ammonia | Quantity: number of stations = 99 Description: Nutrients sampled from CTD bottles |
| Ammonia | Quantity: number of samples = 60 Description: Nutrients and Nutrient isotope from underway seawater. d13C, d15N and d30Si |
| Silicate | Quantity: number of stations = 99 Description: Nutrients sampled from CTD bottles |
| Silicate | Quantity: number of samples = 60 Description: Nutrients and Nutrient isotope from underway seawater. d13C, d15N and d30Si |
| pH | Quantity: number of stations = 6 Description: CTD water analysis - calibration measurements of soccom float pH/TA, POC/HPLC |
| pH | Quantity: number of stations = 98 Description: CTD water analysis - DIC and pH |
| Isotopes | Quantity: number of stations = 97 Description: CTD water analysis - d18O and carbon 13 isotopes sampled though water column. |
| Isotopes | Quantity: number of stations = 25 Description: CTD water analysis - C14, bomb radiocarbon sampled through water column. |
| Isotopes | Quantity: number of samples = 60 Description: Nutrients and Nutrient isotope from underway seawater. d13C, d15N and d30Si |
| Other chemical oceanographic measurements | Quantity: number of stations = 98 Description: CTD water analysis - CFCs and SF6 |
| Other chemical oceanographic measurements | Quantity: number of stations = 99 Description: CTD water analysis - Salinity. Sampled through water column. |
| Other chemical oceanographic measurements | Quantity: 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 measurements | Quantity: track kilometres = 14800 Description: Underway meterological measurements |
| Geology and geophysics | |
| Multi-beam echosounding | Quantity: track kilometres = 14800 Description: EM122 swath bathymetry data |
| Moorings, landers, buoys | |
| Physical oceanography | |
| Subsurface temperature and salinity measurements | 60° 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 measurements | 60° 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 measurements | 60° 49' 37" S 27° 13' 44" W — SOCCOM float. Biogeochemical Argo analogue. |
| Subsurface temperature and salinity measurements | 57° 32' 13" S 15° 22' 30" E — SOCCOM float. Biogeochemical Argo analogue. |
| Subsurface temperature and salinity measurements | 60° 19' 12" S 30° 57' 43" W — SOCCOM float. Biogeochemical Argo analogue. |
| Subsurface temperature and salinity measurements | 60° 50' 52" S 30° 2' 2" E — SOCCOM float. Biogeochemical Argo analogue. |
| Subsurface temperature and salinity measurements | 60° 8' 52" S 48° 7' 30" W — SOCCOM float. Biogeochemical Argo analogue. |
| Subsurface temperature and salinity measurements | 60° 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 floats | 60° 8' 52" S 48° 7' 30" W — SOCCOM float. Biogeochemical Argo analogue. |
| Neutrally buoyant floats | 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 floats | 57° 32' 13" S 15° 22' 30" E — SOCCOM float. Biogeochemical Argo analogue. |
| Neutrally buoyant floats | 60° 49' 37" S 27° 13' 44" W — SOCCOM float. Biogeochemical Argo analogue. |
| Neutrally buoyant floats | 60° 39' 7" S 42° 8' 59" W — SOCCOM float. Biogeochemical Argo analogue. |
| Neutrally buoyant floats | 60° 19' 12" S 30° 57' 43" W — SOCCOM float. Biogeochemical Argo analogue. |
| Neutrally buoyant floats | 60° 50' 52" S 30° 2' 2" E — SOCCOM float. Biogeochemical Argo analogue. |
| Neutrally buoyant floats | 60° 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 | |
| Oxygen | 60° 39' 7" S 42° 8' 59" W — SOCCOM float. Biogeochemical Argo analogue. |
| Oxygen | 60° 19' 12" S 30° 57' 43" W — SOCCOM float. Biogeochemical Argo analogue. |
| Oxygen | 60° 50' 52" S 30° 2' 2" E — SOCCOM float. Biogeochemical Argo analogue. |
| Oxygen | 60° 49' 37" S 27° 13' 44" W — SOCCOM float. Biogeochemical Argo analogue. |
| Oxygen | 60° 8' 52" S 48° 7' 30" W — SOCCOM float. Biogeochemical Argo analogue. |
| Oxygen | 57° 32' 13" S 15° 22' 30" E — SOCCOM float. Biogeochemical Argo analogue. |
| Nitrate | 60° 19' 12" S 30° 57' 43" W — SOCCOM float. Biogeochemical Argo analogue. |
| Nitrate | 57° 32' 13" S 15° 22' 30" E — SOCCOM float. Biogeochemical Argo analogue. |
| Nitrate | 60° 39' 7" S 42° 8' 59" W — SOCCOM float. Biogeochemical Argo analogue. |
| Nitrate | 60° 8' 52" S 48° 7' 30" W — SOCCOM float. Biogeochemical Argo analogue. |
| Nitrate | 60° 49' 37" S 27° 13' 44" W — SOCCOM float. Biogeochemical Argo analogue. |
| Nitrate | 60° 50' 52" S 30° 2' 2" E — SOCCOM float. Biogeochemical Argo analogue. |
| pH | 57° 32' 13" S 15° 22' 30" E — SOCCOM float. Biogeochemical Argo analogue. |
| pH | 60° 49' 37" S 27° 13' 44" W — SOCCOM float. Biogeochemical Argo analogue. |
| pH | 60° 19' 12" S 30° 57' 43" W — SOCCOM float. Biogeochemical Argo analogue. |
| pH | 60° 8' 52" S 48° 7' 30" W — SOCCOM float. Biogeochemical Argo analogue. |
| pH | 60° 39' 7" S 42° 8' 59" W — SOCCOM float. Biogeochemical Argo analogue. |
| pH | 60° 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 |