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RRS Discovery D321B

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Discovery (74E3)
Cruise identifierD321B
Cruise period2007-08-24 — 2007-09-09
StatusCompleted
Port of departureReykjavík, Iceland
Port of returnFairlie, United Kingdom
PurposeResearch
ObjectivesThe cruise achieved objectives were:
1. Standard oceanographic and nutrients section from Iceland to Scotland (the Extended Ellett Line)
2. Serendipitous biological and other chemical observations along the same line
3. Turn-round of long term current meter mooring on Wyville Thomson Ridge
4. Observations of internal waves and turbulence just north of the Wyville Thomson Ridge using short term moorings, CTDs and a microstructure probe

On leaving Reykjavik, Discovery worked most of the Extended Ellett Line stations (with the exceptions of stations from the middle of the Iceland Basin to Rockall which were undertaken on D321) from Iceland to Scotland with only one day down time due to bad weather. We then headed north to the Wyville Thomson Ridge where first an ADCP mooring was turned round, and subsequently microstructure and internal waves were observed. The ship then sailed for Fairlie. The weather was largely fair, and there were no major failures of equipment although the quality of the CTD data are questioned, and original plan to sample zooplankton was abandoned.
Chief scientistToby J Sherwin (Scottish Association for Marine Science)
ProjectOceans 2025
Coordinating bodyNERC
Cruise reportRRS Discovery D321B cruise report d321b.pdf (5.92 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
SpecificIceland Basin; Rockall Plateau; Rockall Trough; Scotland Shelf; Wyville Thomson Ridge
Track chartsRRS Discovery D321B cruise track — d321btrk.pdf (0.02 MB) 
Measurements 
Physical oceanography 
Water bottle stationsQuantity: number of deployments = 61
Description: 24 bottle carousel
CTD stationsQuantity: number of profiles = 7
Description: Seabird 911plus: Seabird 3P temperature sensors; Seabird 4C conductivity sensors; Digiquartz pressure sensor; Seabird 43 DO sensor; Chelsea MKIII Aquatracka fluorometer; Chelsea MkII Aquatracka transmissometer; titanium frame
CTD stationsQuantity: number of profiles = 54
Description: Seabird 911plus: 2 × Seabird 3P temperature sensors; 2 × Seabird 4C conductivity sensors; Digiquartz pressure sensor; Seabird 43 DO sensor; Chelsea MKIII Aquatracka fluorometer; Chelsea MkII Aquatracka transmissometer; upward and downward looking 300 kHz Lowered ADCPs; stainless frame
Subsurface temperature and salinity measurementsQuantity: track kilometres = 3000
Description: Temperature, conductivity, transmissometer, fluorometer (continuous)
Subsurface temperature and salinity measurementsQuantity: track kilometres = 3000
Description: 75 kHz and 150 kHz ship mounted ADCP (continuous)
Other physical oceanographic measurementsQuantity: number of profiles = 1
Description: Sippican T-7 XBT
Other physical oceanographic measurementsQuantity: number of profiles = 102
Description: Sea and Sun Technology microstructure profiler
Chemical oceanography 
OxygenQuantity: number of samples = 54
Description: Winkler titrations for calibrating the CTD DO sensors
PhosphateQuantity: number of profiles = 51
Description: Phosphate, Nitrate, Ammonia, Silicate (analysed on board with a Lachat Quik Chem 8000 flow injection autoanalyser)
NitrateQuantity: number of profiles = 51
Description: Phosphate, Nitrate, Ammonia, Silicate (analysed on board with a Lachat Quik Chem 8000 flow injection autoanalyser)
AmmoniaQuantity: number of profiles = 51
Description: Phosphate, Nitrate, Ammonia, Silicate (analysed on board with a Lachat Quik Chem 8000 flow injection autoanalyser)
SilicateQuantity: number of profiles = 51
Description: Phosphate, Nitrate, Ammonia, Silicate (analysed on board with a Lachat Quik Chem 8000 flow injection autoanalyser)
Trace elementsQuantity: number of profiles = 7
Description: Dissolved iron, iron speciation, total iron. To be analysed at NOCS
Biology and fisheries 
Primary productivityQuantity: number of profiles = 10
Description: Photosynthetic picoeukaryote ecology samples (DNA / RNA) for FISH. To be analysed at the University of Warwick
Primary productivityQuantity: number of profiles = 7
Description: Nutrient addition bioassay experiment
Primary productivityQuantity: number of profiles = 7
Description: Phytoplankton uptake measurements. Analysis to take place at NOCS
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of samples = 150
Description: Microscopy and Flow Cytometry
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of profiles = 24
Description: HPLC. Analysis for pigments to take place at NOCS
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of samples = 40
Description: Total chlorophyll measurements
Particulate organic matter (inc POC, PON)Quantity: number of profiles = 51
Description: Particulate organic carbon and nitrogen. To be analysed at SAMS
Biochemical measurements (eg lipids, amino acids)Quantity: number of profiles = 7
Description: Sampling for viruses, DNA and RNA. To be analysed at NOCS
Biochemical measurements (eg lipids, amino acids)Quantity: number of samples = 6
Description: Sampling for viruses, DNA and RNA. To be analysed at NOCS
Biochemical measurements (eg lipids, amino acids)Quantity: number of profiles = 13
Description: DNA analysis To be analysed back at NOCS
Biochemical measurements (eg lipids, amino acids)Quantity: number of samples = 3
Description: Heme. To be analysed at NOCS
PhytoplanktonQuantity: number of profiles = 17
Description: Phytoplankton samples. To be analysed at SAMS
Pelagic bacteria/micro-organismsQuantity: number of profiles = 21
Description: Flow cytometric analysis using a Becton Dickinson FACSCalibur flow cytometer and a Tecan Miniprep 60 liquid handling robot
Pelagic bacteria/micro-organismsQuantity: number of samples = 14
Description: CTG FASTtracka FRRf
Pelagic bacteria/micro-organismsQuantity: number of profiles = 15
Description: Bacterial isolations from seawater samples
Meteorology 
Routine standard measurementsQuantity: track kilometres = 3000
Description: Port and starboard PAR and TIR; atmospheric temperature and humidity; wind speed and direction; barometric pressure (continuous)
Moorings, landers, buoys 
Physical oceanography 
Subsurface temperature measurements60° 34' 47" N  8° 17' 35" W — Deployed and recovered thermistor chain with 41 minilogs set between 300 and 700 m depth
Subsurface temperature measurements60° 1' 53" N  6° 27' 18" W — Deployed and recovered thermistor chain with 41 minilogs set between 300 and 700 m depth
Current profiler (eg ADCP)60° 14' 41" N  9° 0' 47" W — Deployed upward looking ADCP on the seabed in 1300 m
Current profiler (eg ADCP)60° 15' 0" N  8° 54' 29" W — Recovered upward looking ADCP on the seabed in 1200 m
Data held at BODC Get data
Discrete samples 
61  CTD frame plus rosette samplerAmmonium and ammonia concentration parameters in water bodies
Dissolved metal concentrations in the water column
Particulate total and organic carbon concentrations in the water column
Particulate total and organic nitrogen concentrations in the water column
Silicate concentration parameters in the water column
Salinity of the water column
Nitrate concentration parameters in the water column
Dissolved oxygen parameters in the water column
Phosphate concentration parameters in the water column
3  Instrument mooring
104  Microstructure and precision CTD profiler
42  Sample taken from ship's non-toxic supplySalinity of the water column
1  Unspecified zooplankton net or nets