Resources

RRS Discovery D267

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Discovery (74E3)
Cruise identifierD267
Cruise period2002-11-06 — 2002-12-19
StatusCompleted
Port of departureFairlie, United Kingdom
Port of returnSouthampton, United Kingdom
PurposeResearch
ObjectivesRRS Discovery cruise 267 was the fourth of four cruises supported by the NERC Marine Productivity (MarProd) thematic programme. The MarProd cruise series provided the main opportunity for data- and sample-gathering to address the overall programme goal, viz: "to develop coupled modelling and observation systems for the pelagic ecosystem, with emphasis on physical factors affecting zooplankton dynamics". The specific objectives of the fourth and final MarProd cruise are similar to those of the earlier cruises (D258, 262 and 264), namely:

1. To map the physical features of the survey region (Irminger Sea and parts of the Iceland Basin) in terms of water mass distribution, velocity field and mixed layer properties.
2. Collect water samples for plant pigment and microscopic analyses, to estimate the biomass of different taxonomic/functional groups of microplankton.
3. Measure high resolution profiles of inorganic nutrient concentrations.
4. Determine the 3D abundance of the mesoplankton of interest (primarily Calanus finmarchicus, but also Oithona spp.), and their planktivorous predators (primarily euphausid spp), obtaining material for further taxonomic, physiological and biochemical studies.

In addition, because this was the second winter cruise a number of other studies previously only undertaken on the spring and summer cruises were undertaken on this cruise to determine the closure winter baseline conditions. These studies covered:
* Oithona feeding experiments
* Oithona and Calanus egg production
* C/N and stable isotope ratios
* Primary productivity incubations
* Underway continuous sampling by, and station deployment of, a Fast Repetition rate fluorometer (FRRF), for comparison with primary production experiments.
Chief scientistJohn T Allen (Southampton Oceanography Centre), Steven J Hay (Fisheries Research Services Aberdeen Marine Laboratory)
ProjectMarine Productivity
Coordinating bodyUK NERC
Cruise reportRRS Discovery D267 cruise report d267.pdf (1.93 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
SpecificNorthern North Atlantic, Iceland Basin, Irminger Sea, Reykjanes Ridge
Track chartsRRS Discovery D267 cruise track — d267trk.pdf (0.08 MB) 
Measurements 
Physical oceanography 
CTD stationsQuantity: number of stations = 19
Description: CTD: primary and secondary temperature and conductivity sensors, oxygen, fluorometer, transmissometer, light back scatter and altimeter. Also attached to the frame were two ADCPs operating at 600 and 300 KHz and water bottles.
CTD stationsQuantity: number of deployments = 12
Description: ARIES for collection of zooplankton and measurement of other parameters with CTD, fluorometer, transmissometer, Optical Plankton Counter and water bottles for nutrients, salinity and chlorophyll (for calibration).
Subsurface temperature and salinity measurementsQuantity: activity duration in days = 43
Description: Underway measurements using fluorometer, echo sounder (EA 500), VM-ADCP (Ocean Surveyor) and shipborne wave recorder.
Subsurface temperature and salinity measurementsQuantity: number of hauls = 12
Description: Ocean Sampler for collection of zooplankton, fitted with Optical Plankton Counter and water bottles for nutrients, salinity and chlorophyll (for calibration).
Subsurface temperature and salinity measurementsQuantity: number of deployments = 12
Description: ARIES for collection of zooplankton and measurement of other parameters with CTD, fluorometer, transmissometer, Optical Plankton Counter and water bottles for nutrients, salinity and chlorophyll (for calibration).
Transparency (eg transmissometer)Quantity: number of stations = 19
Description: CTD: primary and secondary temperature and conductivity sensors, oxygen, fluorometer, transmissometer, light back scatter and altimeter. Also attached to the frame were two ADCPs operating at 600 and 300 KHz and water bottles.
Transparency (eg transmissometer)Quantity: number of deployments = 12
Description: ARIES for collection of zooplankton and measurement of other parameters with CTD, fluorometer, transmissometer, Optical Plankton Counter and water bottles for nutrients, salinity and chlorophyll (for calibration).
Current profiler (eg ADCP)Quantity: number of stations = 19
Description: CTD: primary and secondary temperature and conductivity sensors, oxygen, fluorometer, transmissometer, light back scatter and altimeter. Also attached to the frame were two ADCPs operating at 600 and 300 KHz and water bottles.
Current profiler (eg ADCP)Quantity: activity duration in days = 43
Description: Underway measurements using fluorometer, echo sounder (EA 500), VM-ADCP (Ocean Surveyor) and shipborne wave recorder.
Instrumented wave measurementsQuantity: activity duration in days = 43
Description: Underway measurements using fluorometer, echo sounder (EA 500), VM-ADCP (Ocean Surveyor) and shipborne wave recorder.
Chemical oceanography 
OxygenQuantity: number of stations = 19
Description: Water samples taken for analysis of oxygen, ammonia, nutrients, salinity, chlorophyll and stable isotopes at all CTD stations.
OxygenQuantity: number of stations = 19
Description: CTD: primary and secondary temperature and conductivity sensors, oxygen, fluorometer, transmissometer, light back scatter and altimeter. Also attached to the frame were two ADCPs operating at 600 and 300 KHz and water bottles.
PhosphateQuantity: number of deployments = 12
Description: ARIES for collection of zooplankton and measurement of other parameters with CTD, fluorometer, transmissometer, Optical Plankton Counter and water bottles for nutrients, salinity and chlorophyll (for calibration).
PhosphateQuantity: number of hauls = 12
Description: Ocean Sampler for collection of zooplankton, fitted with Optical Plankton Counter and water bottles for nutrients, salinity and chlorophyll (for calibration).
PhosphateQuantity: number of stations = 19
Description: Water samples taken for analysis of oxygen, ammonia, nutrients, salinity, chlorophyll and stable isotopes at all CTD stations.
NitrateQuantity: number of stations = 19
Description: Water samples taken for analysis of oxygen, ammonia, nutrients, salinity, chlorophyll and stable isotopes at all CTD stations.
NitrateQuantity: number of deployments = 12
Description: ARIES for collection of zooplankton and measurement of other parameters with CTD, fluorometer, transmissometer, Optical Plankton Counter and water bottles for nutrients, salinity and chlorophyll (for calibration).
NitrateQuantity: number of hauls = 12
Description: Ocean Sampler for collection of zooplankton, fitted with Optical Plankton Counter and water bottles for nutrients, salinity and chlorophyll (for calibration).
NitriteQuantity: number of stations = 19
Description: Water samples taken for analysis of oxygen, ammonia, nutrients, salinity, chlorophyll and stable isotopes at all CTD stations.
NitriteQuantity: number of deployments = 12
Description: ARIES for collection of zooplankton and measurement of other parameters with CTD, fluorometer, transmissometer, Optical Plankton Counter and water bottles for nutrients, salinity and chlorophyll (for calibration).
NitriteQuantity: number of hauls = 12
Description: Ocean Sampler for collection of zooplankton, fitted with Optical Plankton Counter and water bottles for nutrients, salinity and chlorophyll (for calibration).
IsotopesQuantity: number of stations = 19
Description: Water samples taken for analysis of oxygen, ammonia, nutrients, salinity, chlorophyll and stable isotopes at all CTD stations.
Biology and fisheries 
Primary productivityQuantity: number of deployments = 12
Description: ARIES for collection of zooplankton and measurement of other parameters with CTD, fluorometer, transmissometer, Optical Plankton Counter and water bottles for nutrients, salinity and chlorophyll (for calibration).
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: activity duration in days = 43
Description: Underway measurements using fluorometer, echo sounder (EA 500), VM-ADCP (Ocean Surveyor) and shipborne wave recorder.
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of stations = 19
Description: Water samples taken for analysis of oxygen, ammonia, nutrients, salinity, chlorophyll and stable isotopes at all CTD stations.
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of deployments = 12
Description: ARIES for collection of zooplankton and measurement of other parameters with CTD, fluorometer, transmissometer, Optical Plankton Counter and water bottles for nutrients, salinity and chlorophyll (for calibration).
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of hauls = 12
Description: Ocean Sampler for collection of zooplankton, fitted with Optical Plankton Counter and water bottles for nutrients, salinity and chlorophyll (for calibration).
Biochemical measurements (eg lipids, amino acids)Quantity: number of deployments = 12
Description: ARIES for collection of zooplankton and measurement of other parameters with CTD, fluorometer, transmissometer, Optical Plankton Counter and water bottles for nutrients, salinity and chlorophyll (for calibration).
ZooplanktonQuantity: number of deployments = 12
Description: ARIES for collection of zooplankton and measurement of other parameters with CTD, fluorometer, transmissometer, Optical Plankton Counter and water bottles for nutrients, salinity and chlorophyll (for calibration).
ZooplanktonQuantity: number of hauls = 12
Description: Dual Methot for plankton collection.
ZooplanktonQuantity: number of hauls = 12
Description: Ocean Sampler for collection of zooplankton, fitted with Optical Plankton Counter and water bottles for nutrients, salinity and chlorophyll (for calibration).
NektonQuantity: number of hauls = 12
Description: Dual Methot for plankton collection.
Mammals and reptilesQuantity: number of observations = 6
Description: Cetacean surveys lasting in total 260 minutes.
Geology and geophysics 
Single-beam echosoundingQuantity: activity duration in days = 43
Description: Underway measurements using fluorometer, echo sounder (EA 500), VM-ADCP (Ocean Surveyor) and shipborne wave recorder.
Data held at BODC Get data
Discrete samples 
4  1 metre diameter zooplankton ring net
21  CTD frame plus rosette samplerDissolved total and organic nitrogen concentrations in the water column
Density of the water column
Transmittance and attenuance of the water column
Primary production in the water column
Metadata parameters
Chlorophyll pigment concentrations in water bodies
Silicate concentration parameters in the water column
Zooplankton egg hatch proportion
Salinity of the water column
Concentration of suspended particulate material in the water column
Zooplankton reproduction rate parameters
Nitrate concentration parameters in the water column
Temperature of the water column
Carotenoid and flavenoid pigment concentrations in water bodies
Phosphate concentration parameters in the water column
Phaeopigment concentrations in the water column
Dissolved oxygen parameters in the water column
Experiment state variables
12  Dual Methot netZooplankton taxonomy-related abundance per unit volume of the water column
Zooplankton and zoobenthos morphological parameters
Zooplankton and zoobenthos development stage parameters
Stable isotopes in biota
Metadata parameters
Concentration of other substances in biota
4  Fast Repetition Rate Fluorometer Dark ChamberVariable fluorescence parameters
4  Fast Repetition Rate Fluorometer Light ChamberVariable fluorescence parameters
1  Instrument mooring
9  Lowered EK-500 acoustic profiler
12  MarLab Aberdeen ARIES net and environmental sampling systemZooplankton taxonomy-related abundance per unit volume of the water column
Zooplankton and zoobenthos morphological parameters
Fish abundance in water bodies
Zooplankton growth rates
Density of the water column
Zooplankton chemical composition
Transmittance and attenuance of the water column
Zooplankton and zoobenthos development stage parameters
Metadata parameters
Chlorophyll pigment concentrations in water bodies
Silicate concentration parameters in the water column
Salinity of the water column
Horizontal spatial co-ordinates
Nitrate concentration parameters in the water column
Temperature of the water column
Phosphate concentration parameters in the water column
Reference numbers
Date and time
12  Marine Lab Aberdeen Ocean Sampler netZooplankton chemical composition
Zooplankton and zoobenthos development stage parameters
Metadata parameters
Silicate concentration parameters in the water column
Nitrate concentration parameters in the water column
Phosphate concentration parameters in the water column
262  Sample taken from ship's non-toxic supplyChlorophyll pigment concentrations in water bodies
Silicate concentration parameters in the water column
Salinity of the water column
Nitrate concentration parameters in the water column
Carotenoid and flavenoid pigment concentrations in water bodies
Phosphate concentration parameters in the water column
Phaeopigment concentrations in the water column
2  Secchi disk
24  Towed EK-500 acoustic profiler
2  Twin WP-2 net mounted on a frameZooplankton taxonomy-related abundance per unit volume of the water column
Zooplankton reproduction rate parameters
Zooplankton feeding
12  Unspecified zooplankton net or netsZooplankton taxonomy-related abundance per unit volume of the water column
Zooplankton and zoobenthos morphological parameters
Metadata parameters
Zooplankton reproduction rate parameters
Zooplankton feeding