RRS James Cook JC238
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | RRS James Cook (740H) |
| Cruise identifier | JC238 |
| Cruise period | 2022-07-12 — 2022-07-31 |
| Status | Completed |
| Port of departure | Southampton, United Kingdom |
| Port of return | Southampton, United Kingdom |
| Purpose | Research |
| Objectives | The primary objective of the expedition was to service the OSNAP/CLASS array of moorings that are deployed across the subpolar North Atlantic to measure the variability of the Atlantic Meridional Overturning Circulation (AMOC). The main measurements required are of temperature, salinity, current speed. On this expedition there are two main groups of moorings measuring these variables: one for the Rockall Trough and one in the Iceland Basin. In addition, a CTD section was undertaken between the Scottish continental shelf and the mooring IB3.
The expedition had a number of additional objectives: - Additional instruments were deployed on moorings to measure oxygen and pH. - To calibrate the moored instruments a number of CTD profiles were made measuring temperature, salinity and oxygen. Water samples were taken and analysed for salinity and oxygen, nutrients, DIC and total alkalinity. - Three Argo floats were deployed. These are a part of the international Argo program (http://www.argo.net) - A new drift free pressure sensor was deployed on a lander at the RTEB1 site. - A mooring to observe particles falling to the sea floor (sediment trap and ADCP) was serviced at the Darwin Mounds Marine Protected Area. |
| Chief scientist | Ben I Moat (National Oceanography Centre, Southampton), Kristin Burmeister (Scottish Association for Marine Science) |
| Project | OSNAP; Ellet Array; CLASS |
| Coordinating body | Natural Environment Research Council (NERC) |
| Cruise report |  (28.72 MB) |
| Ocean/sea areas | |
| General | North East Atlantic Ocean (limit 40W) |
| Specific | Rockall Trough, Darwin Mounds MPA, Iceland Basin |
| Measurements | |
| Physical oceanography | |
| Surface measurements underway (T,S) | Quantity: activity duration in days = 20 Description: Underway measurement were made of meteorological variables (wind speed and direction, air temperature and humidity, surface pressure and irradiance); surface (5m) temperature and salinity; subsurface currents from 150kHz and 75 kHz ADCPs and bathymetry from single and multi-beam echo sounders. |
| CTD stations | Quantity: number of stations = 44 Description: CTD stations, vertical profiles of conductivity, temperature, pressure and oxygen. Samples were taken for calibration of salinity and oxygen |
| Current profiler (eg ADCP) | Quantity: activity duration in days = 20 Description: Underway measurement were made of meteorological variables (wind speed and direction, air temperature and humidity, surface pressure and irradiance); surface (5m) temperature and salinity; subsurface currents from 150kHz and 75 kHz ADCPs and bathymetry from single and multi-beam echo sounders. |
| Chemical oceanography | |
| Oxygen | Quantity: number of stations = 44 Description: CTD stations, vertical profiles of conductivity, temperature, pressure and oxygen. Samples were taken for calibration of salinity and oxygen |
| Carbon dioxide | Quantity: number of stations = 19 Description: On selected CTD stations samples were taken and stored for later analysis of dissolved inorganic carbon, and total alkalinity |
| Phosphate | Quantity: number of stations = 37 Description: On selected CTD stations samples were taken and stored for later analysis of inorganic nutrients and organic nitrogen |
| Total - P | Quantity: number of stations = 37 Description: On selected CTD stations samples were taken and stored for later analysis of inorganic nutrients and organic nitrogen |
| Nitrate | Quantity: number of stations = 37 Description: On selected CTD stations samples were taken and stored for later analysis of inorganic nutrients and organic nitrogen |
| Nitrite | Quantity: number of stations = 37 Description: On selected CTD stations samples were taken and stored for later analysis of inorganic nutrients and organic nitrogen |
| Silicate | Quantity: number of stations = 37 Description: On selected CTD stations samples were taken and stored for later analysis of inorganic nutrients and organic nitrogen |
| Alkalinity | Quantity: number of stations = 19 Description: On selected CTD stations samples were taken and stored for later analysis of dissolved inorganic carbon, and total alkalinity |
| Meteorology | |
| Incident radiation | Quantity: activity duration in days = 20 Description: Underway measurement were made of meteorological variables (wind speed and direction, air temperature and humidity, surface pressure and irradiance); surface (5m) temperature and salinity; subsurface currents from 150kHz and 75 kHz ADCPs and bathymetry from single and multi-beam echo sounders. |
| Routine standard measurements | Quantity: activity duration in days = 20 Description: Underway measurement were made of meteorological variables (wind speed and direction, air temperature and humidity, surface pressure and irradiance); surface (5m) temperature and salinity; subsurface currents from 150kHz and 75 kHz ADCPs and bathymetry from single and multi-beam echo sounders. |
| Geology and geophysics | |
| Single-beam echosounding | Quantity: activity duration in days = 20 Description: Underway measurement were made of meteorological variables (wind speed and direction, air temperature and humidity, surface pressure and irradiance); surface (5m) temperature and salinity; subsurface currents from 150kHz and 75 kHz ADCPs and bathymetry from single and multi-beam echo sounders. |
| Multi-beam echosounding | Quantity: activity duration in days = 20 Description: Underway measurement were made of meteorological variables (wind speed and direction, air temperature and humidity, surface pressure and irradiance); surface (5m) temperature and salinity; subsurface currents from 150kHz and 75 kHz ADCPs and bathymetry from single and multi-beam echo sounders. |
| Moorings, landers, buoys | |
| Physical oceanography | |
| CTD stations | 57° 57' 11" N 23° 10' 12" W — Argo autonomous profiling float deployment - NKE-PROVOR P44043-21UK004, 0-2000m |
| CTD stations | 57° 18' 17" N 10° 24' 0" W — Argo autonomous profiling float deployment - SBS-NAVIS F1102, 0-2000m |
| CTD stations | 57° 57' 42" N 23° 10' 18" W — Argo autonomous profiling float deployment - SBS-NAVIS F1101, 0-2000m |
| Subsurface temperature and salinity measurements | 57° 6' 0" N 9° 33' 47" W — 9 CTD, 5 Oxygen, 6 current meter, 2 Ph, 50m-1800m recovered |
| Subsurface temperature and salinity measurements | 58° 0' 47" N 24° 25' 30" W — 12 CTD, 3 current meter, 2 ADCP, 50m-2900m recovered |
| Subsurface temperature and salinity measurements | 57° 6' 0" N 9° 33' 47" W — 10 CTD, 4 Oxygen, 6 current meter, 1 Ph, 50m-1800m deployed |
| Subsurface temperature and salinity measurements | 59° 51' 42" N 7° 2' 41" W — 1 CTD, 1 sediment traps, 1 current meter, 950 -1000m recovered |
| Subsurface temperature and salinity measurements | 59° 51' 42" N 7° 2' 41" W — 2 CTD, 1 sediment traps, 1 current meter, 950 -1000m deployed |
| Subsurface temperature and salinity measurements | 58° 0' 47" N 24° 25' 30" W — 13 CTD, 3 current meter, 2 ADCP, 50m-2900m deployed |
| Subsurface temperature and salinity measurements | 57° 59' 24" N 21° 8' 48" W — 12 CTD, 2 Oxygen, 3 current meter, 2 ADCP, 50m-2900m recovered |
| Subsurface temperature and salinity measurements | 57° 59' 24" N 21° 8' 48" W — 13 CTD, 4 Oxygen, 3 current meter, 2 ADCP, 50m-2900m deployed |
| Subsurface temperature and salinity measurements | 57° 48' 6" N 19° 10' 18" W — 7 CTD, 2 current meter, 2 ADCP, 50m-900m (IB5) deployed and recovered |
| Subsurface temperature and salinity measurements | 57° 28' 11" N 12° 18' 36" W — 3 CTD, 3 current meter, 1000m-1800m (WB2) deployed and recovered |
| Subsurface temperature and salinity measurements | 57° 28' 11" N 12° 42' 18" W — 9 CTD, 5 current meter, 50m-1600m (WB1) deployed and recovered |
| Current meters | 57° 6' 0" N 9° 33' 47" W — 9 CTD, 5 Oxygen, 6 current meter, 2 Ph, 50m-1800m recovered |
| Current meters | 57° 48' 6" N 19° 10' 18" W — 7 CTD, 2 current meter, 2 ADCP, 50m-900m (IB5) deployed and recovered |
| Current meters | 57° 6' 0" N 9° 33' 47" W — 10 CTD, 4 Oxygen, 6 current meter, 1 Ph, 50m-1800m deployed |
| Current meters | 59° 51' 42" N 7° 2' 41" W — 2 CTD, 1 sediment traps, 1 current meter, 950 -1000m deployed |
| Current meters | 57° 28' 11" N 12° 18' 36" W — 3 CTD, 3 current meter, 1000m-1800m (WB2) deployed and recovered |
| Current meters | 58° 0' 47" N 24° 25' 30" W — 12 CTD, 3 current meter, 2 ADCP, 50m-2900m recovered |
| Current meters | 59° 51' 42" N 7° 2' 41" W — 1 CTD, 1 sediment traps, 1 current meter, 950 -1000m recovered |
| Current meters | 57° 59' 24" N 21° 8' 48" W — 13 CTD, 4 Oxygen, 3 current meter, 2 ADCP, 50m-2900m deployed |
| Current meters | 57° 59' 24" N 21° 8' 48" W — 12 CTD, 2 Oxygen, 3 current meter, 2 ADCP, 50m-2900m recovered |
| Current meters | 58° 0' 47" N 24° 25' 30" W — 13 CTD, 3 current meter, 2 ADCP, 50m-2900m deployed |
| Current meters | 57° 28' 11" N 12° 42' 18" W — 9 CTD, 5 current meter, 50m-1600m (WB1) deployed and recovered |
| Current profiler (eg ADCP) | 58° 0' 47" N 24° 25' 30" W — 12 CTD, 3 current meter, 2 ADCP, 50m-2900m recovered |
| Current profiler (eg ADCP) | 57° 48' 6" N 19° 10' 18" W — 7 CTD, 2 current meter, 2 ADCP, 50m-900m (IB5) deployed and recovered |
| Current profiler (eg ADCP) | 58° 0' 47" N 24° 25' 30" W — 13 CTD, 3 current meter, 2 ADCP, 50m-2900m deployed |
| Current profiler (eg ADCP) | 57° 59' 24" N 21° 8' 48" W — 13 CTD, 4 Oxygen, 3 current meter, 2 ADCP, 50m-2900m deployed |
| Current profiler (eg ADCP) | 57° 59' 24" N 21° 8' 48" W — 12 CTD, 2 Oxygen, 3 current meter, 2 ADCP, 50m-2900m recovered |
| Sea level (inc. bot. press., inverted echosounder) | 57° 5' 53" N 9° 33' 6" W — 1 bottom pressure recorder, 1000m deployed and recovered |
| Chemical oceanography | |
| Oxygen | 57° 57' 42" N 23° 10' 18" W — Argo autonomous profiling float deployment - SBS-NAVIS F1101, 0-2000m |
| Oxygen | 57° 6' 0" N 9° 33' 47" W — 10 CTD, 4 Oxygen, 6 current meter, 1 Ph, 50m-1800m deployed |
| Oxygen | 57° 59' 24" N 21° 8' 48" W — 12 CTD, 2 Oxygen, 3 current meter, 2 ADCP, 50m-2900m recovered |
| Oxygen | 57° 57' 11" N 23° 10' 12" W — Argo autonomous profiling float deployment - NKE-PROVOR P44043-21UK004, 0-2000m |
| Oxygen | 57° 6' 0" N 9° 33' 47" W — 9 CTD, 5 Oxygen, 6 current meter, 2 Ph, 50m-1800m recovered |
| Oxygen | 57° 59' 24" N 21° 8' 48" W — 13 CTD, 4 Oxygen, 3 current meter, 2 ADCP, 50m-2900m deployed |
| Oxygen | 57° 18' 17" N 10° 24' 0" W — Argo autonomous profiling float deployment - SBS-NAVIS F1102, 0-2000m |
| Nitrate | 57° 57' 11" N 23° 10' 12" W — Argo autonomous profiling float deployment - NKE-PROVOR P44043-21UK004, 0-2000m |
| Nitrate | 57° 18' 17" N 10° 24' 0" W — Argo autonomous profiling float deployment - SBS-NAVIS F1102, 0-2000m |
| Nitrate | 57° 57' 42" N 23° 10' 18" W — Argo autonomous profiling float deployment - SBS-NAVIS F1101, 0-2000m |
| pH | 57° 57' 11" N 23° 10' 12" W — Argo autonomous profiling float deployment - NKE-PROVOR P44043-21UK004, 0-2000m |
| pH | 57° 57' 42" N 23° 10' 18" W — Argo autonomous profiling float deployment - SBS-NAVIS F1101, 0-2000m |
| pH | 57° 6' 0" N 9° 33' 47" W — 9 CTD, 5 Oxygen, 6 current meter, 2 Ph, 50m-1800m recovered |
| pH | 57° 18' 17" N 10° 24' 0" W — Argo autonomous profiling float deployment - SBS-NAVIS F1102, 0-2000m |
| pH | 57° 6' 0" N 9° 33' 47" W — 10 CTD, 4 Oxygen, 6 current meter, 1 Ph, 50m-1800m deployed |
| Biology and fisheries | |
| Phytoplankton pigs (eg chlorophyll, fluorescence) | 57° 57' 42" N 23° 10' 18" W — Argo autonomous profiling float deployment - SBS-NAVIS F1101, 0-2000m |
| Phytoplankton pigs (eg chlorophyll, fluorescence) | 57° 18' 17" N 10° 24' 0" W — Argo autonomous profiling float deployment - SBS-NAVIS F1102, 0-2000m |
| Phytoplankton pigs (eg chlorophyll, fluorescence) | 57° 57' 11" N 23° 10' 12" W — Argo autonomous profiling float deployment - NKE-PROVOR P44043-21UK004, 0-2000m |
| Sediment traps | 59° 51' 42" N 7° 2' 41" W — 2 CTD, 1 sediment traps, 1 current meter, 950 -1000m deployed |
| Sediment traps | 59° 51' 42" N 7° 2' 41" W — 1 CTD, 1 sediment traps, 1 current meter, 950 -1000m recovered |
