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RRS Discovery D368
Cruise summary report
Cruise Info. | |||||
Ship name (ship code) | RRS Discovery (74E3) | ||||
Cruise identifier | D368 | ||||
Cruise period | 2011-07-15 — 2011-08-04 | ||||
Status | Completed | ||||
Port of departure | Liverpool, United Kingdom | ||||
Port of return | Santa Cruz de Tenerife, Spain | ||||
Purpose | Research | ||||
Objectives | CTD stations on 20W line from 50N to 20N, following the old WOCE line A16N
Physical measurements (CTDO and LADCP) and discrete samples for salt, oxygen, inorganic nutrients and alkalinity/inorganic carbon Underway ADCP, surface ocean measurements, surface meteorology measurements. Contribution to GO-SHIP sustained hydrography program. Partial repeat of a hydrographic line last occupied in 2003. | ||||
Chief scientist | Brian A King (National Oceanography Centre, Southampton) | ||||
Project | GO-SHIP | ||||
Coordinating body | National Oceanography Centre, Southampton | ||||
Cruise report | (5.85 MB) | ||||
Ocean/sea areas | |||||
General | North East Atlantic Ocean (limit 40W) | ||||
Specific | North Atlantic Ocean, 20°W, 20°N to 50°N | ||||
Track charts | (0.09 MB) | ||||
Measurements | |||||
Physical oceanography | |||||
Surface measurements underway (T,S) | Quantity: activity duration in days = 20 Description: Discrete salinity samples from underway supply, analysed using an autosalinometer. Used to calibrate the underway salinity sensor situated in the SurfMet system. | ||||
Surface measurements underway (T,S) | Quantity: activity duration in days = 20 Description: Underway salinity, temperature, transmittance and fluorescence from SurfMet system | ||||
Water bottle stations | Quantity: number of stations = 29 Description: Discrete inorganic nutrients (N, P & Si) samples from CTD bottles, analysed using automated segmented flow analysis with colourimetric detection. | ||||
Water bottle stations | Quantity: number of stations = 29 Description: Discrete water samples collected from CTD bottles to determine dissolved inorganic carbon (DIC) concentration and total alkalinity using coulometry and potentiometry analysis | ||||
Water bottle stations | Quantity: number of stations = 29 Description: Water collected from depth for discrete samples using a SeaBird 911+ stainless steel CTD frame fitted with SBE 32, 24-way carousel and 24 x 10 L Niskin bottles. Station depths ranged from 3404-5329 metres | ||||
Water bottle stations | Quantity: number of stations = 29 Description: Discrete salinity samples from CTD bottles, analysed using an autosalinometer. Used to calibrate CTD salinity | ||||
Water bottle stations | Quantity: number of stations = 29 Description: Discrete oxygen samples from CTD bottles, analysed using Winkler titration and Metrohm 794 Basic Tritrino titration unit. Used to calibrate CTD oxygen sensor. | ||||
CTD stations | Quantity: number of stations = 29 Description: Temperature, salinity, pressure, transmittance, fluorescence, oxygen and back-scatter using a SeaBird 911+ stainless steel CTD unit. Station depths ranged from 3404-5329 metres | ||||
CTD stations | Quantity: number of stations = 29 Description: Sea water velocities using a RDI WH monitor 300 kHz lowered acoustic doppler current profiler (LADCP) | ||||
Subsurface temperature and salinity measurements | Quantity: activity duration in days = 20 Description: Water velocities using a 75 kHz vessel mounted acoustic doppler current profiler (VMADCP) | ||||
Transparency (eg transmissometer) | Quantity: activity duration in days = 20 Description: Underway salinity, temperature, transmittance and fluorescence from SurfMet system | ||||
Transparency (eg transmissometer) | Quantity: number of stations = 29 Description: Temperature, salinity, pressure, transmittance, fluorescence, oxygen and back-scatter using a SeaBird 911+ stainless steel CTD unit. Station depths ranged from 3404-5329 metres | ||||
Optics (eg underwater light levels) | Quantity: activity duration in days = 20 Description: Underway salinity, temperature, transmittance and fluorescence from SurfMet system | ||||
Current profiler (eg ADCP) | Quantity: activity duration in days = 20 Description: Water velocities using a 75 kHz vessel mounted acoustic doppler current profiler (VMADCP) | ||||
Current profiler (eg ADCP) | Quantity: number of stations = 29 Description: Sea water velocities using a RDI WH monitor 300 kHz lowered acoustic doppler current profiler (LADCP) | ||||
Neutrally buoyant floats | Quantity: number of deployments = 3 Description: 3 PROVOR floats deployed for French Argo program | ||||
Chemical oceanography | |||||
Oxygen | Quantity: number of stations = 29 Description: Discrete oxygen samples from CTD bottles, analysed using Winkler titration and Metrohm 794 Basic Tritrino titration unit. Used to calibrate CTD oxygen sensor. | ||||
Phosphate | Quantity: number of stations = 29 Description: Discrete inorganic nutrients (N, P & Si) samples from CTD bottles, analysed using automated segmented flow analysis with colourimetric detection. | ||||
Total - N | Quantity: number of stations = 29 Description: Discrete inorganic nutrients (N, P & Si) samples from CTD bottles, analysed using automated segmented flow analysis with colourimetric detection. | ||||
Silicate | Quantity: number of stations = 29 Description: Discrete inorganic nutrients (N, P & Si) samples from CTD bottles, analysed using automated segmented flow analysis with colourimetric detection. | ||||
Alkalinity | Quantity: number of stations = 29 Description: Discrete water samples collected from CTD bottles to determine dissolved inorganic carbon (DIC) concentration and total alkalinity using coulometry and potentiometry analysis | ||||
Other chemical oceanographic measurements | Quantity: number of stations = 29 Description: Discrete water samples collected from CTD bottles to determine dissolved inorganic carbon (DIC) concentration and total alkalinity using coulometry and potentiometry analysis | ||||
Biology and fisheries | |||||
Phytoplankton | Quantity: number of stations = 15 Description: Water samples collected from CTD bottles and concentrated by filtration. Samples were frozen immediately at -80C and stored for further molecular characterisation of the bacterial and smallest phytoplankton communities. | ||||
Pelagic bacteria/micro-organisms | Quantity: number of stations = 15 Description: Water samples collected from CTD bottles and concentrated by filtration. Samples were frozen immediately at -80C and stored for further molecular characterisation of the bacterial and smallest phytoplankton communities. | ||||
Meteorology | |||||
Routine standard measurements | Quantity: activity duration in days = 20 Description: Underway atmospheric pressure, air temperature, air humidity, total irradiance (TIR), photosynthetic radiation (PAR), wind speed and wind direction from SurfMet system | ||||
Geology and geophysics | |||||
Single-beam echosounding | Quantity: activity duration in days = 20 Description: Sea floor depth using a SIMRAD EA600 | ||||
Data held at BODC | Get data | ||||
Series/Profiles | |||||
1 Acoustic doppler current profiler | Reference numbers Horizontal spatial co-ordinates Date and time Vertical spatial coordinates Horizontal platform movement Horizontal velocity of the water column (currents) Reference numbers Horizontal spatial co-ordinates Date and time Vertical spatial coordinates Horizontal platform movement Horizontal velocity of the water column (currents)
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28 Bottle station | Reference numbers Vertical spatial coordinates Phosphate concentration parameters in the water column Silicate concentration parameters in the water column Nitrate concentration parameters in the water column Quality control flags Reference numbers Vertical spatial coordinates Phosphate concentration parameters in the water column Silicate concentration parameters in the water column Nitrate concentration parameters in the water column Quality control flags
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29 CTD/STD cast | Reference numbers Transmittance and attenuance of the water column Vertical spatial coordinates Optical backscatter Dissolved oxygen parameters in the water column Temperature of the water column Salinity of the water column Density of the water column Electrical conductivity of the water column Chlorophyll pigment concentrations in water bodies Reference numbers Transmittance and attenuance of the water column Vertical spatial coordinates Optical backscatter Dissolved oxygen parameters in the water column Temperature of the water column Salinity of the water column Density of the water column Electrical conductivity of the water column Chlorophyll pigment concentrations in water bodies
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Discrete samples | |||||
58 CTD frame plus rosette sampler | Dissolved oxygen parameters in the water column Salinity of the water column | ||||
110 Sample taken from ship's non-toxic supply | Salinity of the water column |