Resources

RRS James Cook JC145

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS James Cook (740H)
Cruise identifierJC145
Cruise period2017-02-28 — 2017-04-08
StatusCompleted
Port of departureSanta Cruz de Tenerife, Spain
Port of returnFreeport, Bahamas
PurposeResearch
ObjectivesThe purpose of RRS James Cook cruise JC145 was to refurbish the RAPID 26°N array of moorings that span the Atlantic from the Bahamas to the Canary Islands. Cruise JC145 departed from Santa Cruz de Tenerife on Tuesday 28th February 2017 and ended on Saturday 8th April at Freeport, Bahamas. There was a port call at Nassau, Bahamas on 27th March to exchange personnel and to take on board additional equipment. The moorings are part of a purposeful Atlantic wide array that monitors the Atlantic Meridional Overturning Circulation and the associated heat transport. The RAPID-MOCHA-WBTS array is a joint UK- US programme.

During JC145 moorings were serviced at sites: EBH4, EBH4L, EBH3, EBH2, EBH1, EBH1L, EBHi, EB1, EB1L, MAR3, MAR3L, MAR2, MAR1, MAR1L, MAR0, WB6, WB4, WB4L, WBH2, WB2, WB2L, WB1, WBADCP and WBAL. Sites with suffix ‘L’ denote landers fitted with bottom pressure recorders.

The ABC Fluxes project extends the measurements on the RAPID 26°N array to include biological and chemical measurements. Cruise JC145 was the first recovery of these instruments and another set were deployed to continue measurement until autumn of 2018.

CTD stations were conducted throughout the cruise for purposes of providing pre- and post- deployment calibrations for mooring instrumentation (including oxygen and carbonate chemistry sampling) and for testing mooring releases prior to deployment.

The RAPID telemetry MkIII system was recovered from site EBHi, and 24 temperature sensors and 2 75kHz ADCPs were recovered from mooring WB1 for the MerMEED project.

Shipboard underway measurements were systematically logged, processed and calibrated, including: surface meteorology, 5m depth sea temperatures and salinities, water depth, and navigation. Water velocity profiles from 15 m to approximately 800 m depth were obtained using two vessel mounted Acoustic Doppler Current Profilers (one 75 kHz and one 150 kHz).
Chief scientistDavid Smeed (National Oceanography Centre, Southampton)
Cruise reportRRS James Cook JC145 cruise report jc145.pdf (14.22 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
SpecificNorth Atlantic at 26N
Measurements 
Physical oceanography 
Surface measurements underway (T,S)Quantity: activity duration in days = 38
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. Gravity measurements were made in preparation for a following cruise.
CTD stationsQuantity: number of stations = 25
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 = 38
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. Gravity measurements were made in preparation for a following cruise.
Chemical oceanography 
OxygenQuantity: number of stations = 25
Description: CTD stations, vertical profiles of conductivity, temperature, pressure and oxygen. Samples were taken for calibration of salinity and oxygen
Carbon dioxideQuantity: number of stations = 8
Description: On selected CTD stations samples were taken and stored for later analysis of dissolved inorganic carbon, total alkalinity, inorganic nutrients and organic nitrogen
PhosphateQuantity: number of stations = 8
Description: On selected CTD stations samples were taken and stored for later analysis of dissolved inorganic carbon, total alkalinity, inorganic nutrients and organic nitrogen
Total - PQuantity: number of stations = 8
Description: On selected CTD stations samples were taken and stored for later analysis of dissolved inorganic carbon, total alkalinity, inorganic nutrients and organic nitrogen
NitrateQuantity: number of stations = 8
Description: On selected CTD stations samples were taken and stored for later analysis of dissolved inorganic carbon, total alkalinity, inorganic nutrients and organic nitrogen
NitriteQuantity: number of stations = 8
Description: On selected CTD stations samples were taken and stored for later analysis of dissolved inorganic carbon, total alkalinity, inorganic nutrients and organic nitrogen
SilicateQuantity: number of stations = 8
Description: On selected CTD stations samples were taken and stored for later analysis of dissolved inorganic carbon, total alkalinity, inorganic nutrients and organic nitrogen
AlkalinityQuantity: number of stations = 8
Description: On selected CTD stations samples were taken and stored for later analysis of dissolved inorganic carbon, total alkalinity, inorganic nutrients and organic nitrogen
pHQuantity: number of stations = 8
Description: On selected CTD stations samples were taken and stored for later analysis of dissolved inorganic carbon, total alkalinity, inorganic nutrients and organic nitrogen
Meteorology 
Incident radiationQuantity: activity duration in days = 38
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. Gravity measurements were made in preparation for a following cruise.
Routine standard measurementsQuantity: activity duration in days = 38
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. Gravity measurements were made in preparation for a following cruise.
Geology and geophysics 
Single-beam echosoundingQuantity: activity duration in days = 38
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. Gravity measurements were made in preparation for a following cruise.
Multi-beam echosoundingQuantity: activity duration in days = 38
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. Gravity measurements were made in preparation for a following cruise.
Gravity measurementsQuantity: activity duration in days = 38
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. Gravity measurements were made in preparation for a following cruise.
Moorings, landers, buoys 
Physical oceanography 
CTD stations24° 42' 24" N  21° 49' 41" W — Argo autonomous profiling float deployment #6985, 0-2000m
CTD stations23° 56' 17" N  44° 28' 59" W — Argo autonomous profiling float deployment #6604, 0-2000m
CTD stations24° 23' 12" N  67° 1' 11" W — Argo autonomous profiling float deployment #6028, 0-6000m
CTD stations24° 3' 6" N  46° 29' 41" W — Argo autonomous profiling float deployment #6989, 0-2000m
CTD stations25° 0' 0" N  55° 0' 0" W — Argo autonomous profiling float deployment #6021, 0-6000m
CTD stations24° 36' 24" N  63° 59' 53" W — Argo autonomous profiling float deployment #6027, 0-6000m
CTD stations24° 55' 12" N  56° 33' 47" W — Argo autonomous profiling float deployment #6984, 0-2000m
CTD stations24° 44' 48" N  60° 59' 41" W — Argo autonomous profiling float deployment #6026, 0-6000m
CTD stations24° 51' 0" N  58° 0' 0" W — Argo autonomous profiling float deployment #6025, 0-6000m
Subsurface temperature and salinity measurements27° 36' 53" N  14° 12' 36" W — 3 CTD, 1 current meter, 1600m-2000m
Subsurface temperature and salinity measurements27° 48' 35" N  13° 44' 41" W — 14 CTD, 4 current meters, 100m-1400m
Subsurface temperature and salinity measurements27° 51' 0" N  13° 32' 17" W — 10 CTD, 1 current meter, 100m-10000m,
Subsurface temperature and salinity measurements26° 30' 42" N  76° 44' 30" W — 5 CTD, 2 ADCP, 4 current meters, 2 oxygen, 1, pH, 1pC02, 1 sampler, 21 temperature, 50m-1350m
Subsurface temperature and salinity measurements26° 28' 48" N  76° 37' 30" W — 8 CTD, 5 current meters, 3 oxygen, 1 sampler, 1500m-4860m
Subsurface temperature and salinity measurements26° 26' 53" N  75° 43' 11" W — 15 CTD, 9 current meters, 6 Oxygen, 1 ADCP, 50m-4600m
Subsurface temperature and salinity measurements26° 29' 35" N  70° 31' 23" W — 5 CTD, 1 current meter, 4800m-5500m
Subsurface temperature and salinity measurements25° 8' 24" N  52° 1' 18" W — 5 CTD, 1 current meter, 4780m-5510m
Subsurface temperature and salinity measurements24° 10' 0" N  49° 44' 35" W — 18 CTD, 2 current meters, 6 oxygen, 1, pH, 1pC02, 1 sampler. 50m-5100m, Not all recovered
Subsurface temperature and salinity measurements23° 45' 36" N  24° 9' 24" W — 18 CTD, 1 current meter, 6 oxygen 4 oxygen, 1, pH, 1pC02, 1 sampler, 50m-5000m
Subsurface temperature and salinity measurements26° 30' 42" N  76° 44' 30" W — 16 CTD, 8 current meters, 50m - 3850m
Subsurface temperature and salinity measurements23° 52' 18" N  41° 4' 59" W — 18 CTD, 2 current meters
Subsurface temperature and salinity measurements24° 56' 12" N  21° 15' 47" W — 3 CTD, 1 current meter, 3500m-4500m
Subsurface temperature and salinity measurements27° 13' 18" N  15° 25' 18" W — 2CTD, 1 current meter 2500m-3000m
Current meters27° 51' 0" N  13° 32' 17" W — 10 CTD, 1 current meter, 100m-10000m,
Current meters27° 13' 18" N  15° 25' 18" W — 2CTD, 1 current meter 2500m-3000m
Current meters25° 8' 24" N  52° 1' 18" W — 5 CTD, 1 current meter, 4780m-5510m
Current meters26° 28' 48" N  76° 37' 30" W — 8 CTD, 5 current meters, 3 oxygen, 1 sampler, 1500m-4860m
Current meters26° 29' 35" N  70° 31' 23" W — 5 CTD, 1 current meter, 4800m-5500m
Current meters23° 45' 36" N  24° 9' 24" W — 18 CTD, 1 current meter, 6 oxygen 4 oxygen, 1, pH, 1pC02, 1 sampler, 50m-5000m
Current meters27° 48' 35" N  13° 44' 41" W — 14 CTD, 4 current meters, 100m-1400m
Current meters24° 10' 0" N  49° 44' 35" W — 18 CTD, 2 current meters, 6 oxygen, 1, pH, 1pC02, 1 sampler. 50m-5100m, Not all recovered
Current meters27° 36' 53" N  14° 12' 36" W — 3 CTD, 1 current meter, 1600m-2000m
Current meters26° 30' 42" N  76° 44' 30" W — 5 CTD, 2 ADCP, 4 current meters, 2 oxygen, 1, pH, 1pC02, 1 sampler, 21 temperature, 50m-1350m
Current meters23° 52' 18" N  41° 4' 59" W — 18 CTD, 2 current meters
Current meters26° 30' 42" N  76° 44' 30" W — 16 CTD, 8 current meters, 50m - 3850m
Current meters26° 26' 53" N  75° 43' 11" W — 15 CTD, 9 current meters, 6 Oxygen, 1 ADCP, 50m-4600m
Current meters24° 56' 12" N  21° 15' 47" W — 3 CTD, 1 current meter, 3500m-4500m
Current profiler (eg ADCP)26° 26' 53" N  75° 43' 11" W — 15 CTD, 9 current meters, 6 Oxygen, 1 ADCP, 50m-4600m
Current profiler (eg ADCP)26° 31' 48" N  76° 52' 0" W — 1 ADCP 600m
Sea level (inc. bot. press., inverted echosounder)26° 30' 11" N  76° 44' 35" W — 2 bottom pressure recorders, 3870m
Sea level (inc. bot. press., inverted echosounder)26° 28' 41" N  75° 42' 11" W — 2 bottom pressure recorders, 4690m
Sea level (inc. bot. press., inverted echosounder)24° 11' 59" N  49° 43' 54" W — 2 bottom pressure recorders, 5225m
Sea level (inc. bot. press., inverted echosounder)23° 48' 0" N  24° 8' 30" W — 2 bottom pressure recorders, 5089m
Sea level (inc. bot. press., inverted echosounder)27° 12' 11" N  15° 25' 0" W — 2 bottom pressure recorders, 3031m
Sea level (inc. bot. press., inverted echosounder)27° 52' 5" N  13° 30' 35" W — 2 bottom pressure recorders, 993m
Sea level (inc. bot. press., inverted echosounder)23° 51' 42" N  41° 5' 48" W — 2 bottom pressure recorders, 5030m
Sea level (inc. bot. press., inverted echosounder)26° 32' 12" N  76° 53' 6" W — 2 bottom pressure recorders, 600m, none recovered
Chemical oceanography 
Oxygen26° 26' 53" N  75° 43' 11" W — 15 CTD, 9 current meters, 6 Oxygen, 1 ADCP, 50m-4600m
Oxygen23° 45' 36" N  24° 9' 24" W — 18 CTD, 1 current meter, 6 oxygen 4 oxygen, 1, pH, 1pC02, 1 sampler, 50m-5000m
Oxygen24° 10' 0" N  49° 44' 35" W — 18 CTD, 2 current meters, 6 oxygen, 1, pH, 1pC02, 1 sampler. 50m-5100m, Not all recovered
Oxygen26° 30' 42" N  76° 44' 30" W — 5 CTD, 2 ADCP, 4 current meters, 2 oxygen, 1, pH, 1pC02, 1 sampler, 21 temperature, 50m-1350m
Oxygen26° 28' 48" N  76° 37' 30" W — 8 CTD, 5 current meters, 3 oxygen, 1 sampler, 1500m-4860m
Carbon dioxide26° 28' 48" N  76° 37' 30" W — 8 CTD, 5 current meters, 3 oxygen, 1 sampler, 1500m-4860m
Carbon dioxide26° 30' 42" N  76° 44' 30" W — 5 CTD, 2 ADCP, 4 current meters, 2 oxygen, 1, pH, 1pC02, 1 sampler, 21 temperature, 50m-1350m
Carbon dioxide24° 10' 0" N  49° 44' 35" W — 18 CTD, 2 current meters, 6 oxygen, 1, pH, 1pC02, 1 sampler. 50m-5100m, Not all recovered
Carbon dioxide23° 45' 36" N  24° 9' 24" W — 18 CTD, 1 current meter, 6 oxygen 4 oxygen, 1, pH, 1pC02, 1 sampler, 50m-5000m
pH26° 30' 42" N  76° 44' 30" W — 5 CTD, 2 ADCP, 4 current meters, 2 oxygen, 1, pH, 1pC02, 1 sampler, 21 temperature, 50m-1350m
pH24° 10' 0" N  49° 44' 35" W — 18 CTD, 2 current meters, 6 oxygen, 1, pH, 1pC02, 1 sampler. 50m-5100m, Not all recovered
pH23° 45' 36" N  24° 9' 24" W — 18 CTD, 1 current meter, 6 oxygen 4 oxygen, 1, pH, 1pC02, 1 sampler, 50m-5000m
pH26° 28' 48" N  76° 37' 30" W — 8 CTD, 5 current meters, 3 oxygen, 1 sampler, 1500m-4860m
Biology and fisheries 
Sediment traps23° 45' 17" N  41° 5' 41" W — 2 sediment traps + 2 current meters, c. 3000m, 1 CTD 4300m
Data held at BODC Get data
Discrete samples 
25  CTD frame plus rosette sampler
24  Instrument mooring
78  Sample taken from ship's non-toxic supply