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RRS Discovery D351

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Discovery (74E3)
Cruise identifierD351
Cruise period2010-05-11 — 2010-05-28
StatusCompleted
Port of departureReykjavík, Iceland
Port of returnGovan, United Kingdom
PurposeResearch
Objectives1. To occupy the Extended Ellett Line and add to the 35-year time series of measurements of temperature and salinity and tracer properties of the water column (Oceans 2025 Theme 10 SO4).
2. To investigate the iron and trace metal distribution and variability in the Northeast Atlantic.
3. To conduct experiments to determine the horizontal, vertical and diurnal distribution of bioluminescence in dinoflagellates, and to determine the growth and grazing rates of bacteria and phytoplankton, their carbon ingestion rates and iron speciation.
4. To investigate the physical processes operating at the Anton Dohrn seamount and identify whether there are mechanisms promoting productivity through the enhancement of nutrient concentrations (Oceans 2025 Theme 2 WP2.5)
5. To investigate the presence of volcanic ash in the upper water column south of Iceland and investigate the impact on the chemistry of seawater, following the eruption of the Eyjafjallajokull volcano.

All observations necessary to fulfil the cruise objectives were made, except for some reduction to the survey of the Anton Dohrn Seamount (objective 4) because of time lost at the beginning of the cruise
Chief scientistJane F Read (National Oceanography Centre, Southampton)
ProjectOceans 2025 Theme 10: Extended Ellett Line
Coordinating bodyNatural Environment Research Council (NERC)
Cruise reportRRS Discovery D351 cruise report d351.pdf (1.62 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
SpecificNortheast Atlantic
Track chartsRRS Discovery D351 cruise track — d351trk.pdf (0.12 MB) 
Measurements 
Physical oceanography 
CTD stationsQuantity: track kilometres = 930
Description: Towed undulating CTD (SeaSoar); temperature, conductivity, pressure, chlorophyll-a (Chelsea Minipack & Turner Designs), Turner Designs phycocyanin, phycoerythrin, CDOM U, Anderaa oxygen, PAR, bioluminescence, nitrate (SUV6), FRRF, LOPC
CTD stationsQuantity: number of stations = 7
Description: Titanium CTD bottle samples for dissolved aluminium, iron & trace metals
CTD stationsQuantity: number of stations = 13
Description: Profiling titanium CTD; temperaturex2, conductivityx2, pressure, dissolved oxygen, fluorometer, altimeter, backscatter, transmissometer
CTD stationsQuantity: number of stations = 88
Description: Profiling stainless steel CTD; temperaturex2, conductivityx2, pressure, dissolved oxygen, fluorometer, transmissometer, LADCP, altimeter, pinger
Chemical oceanography 
Other dissolved gasesQuantity: number of deployments = 3
Description: Stand alone pumps; three deployments; 7 filters
Other dissolved gasesQuantity: number of samples = 6
Description: 6 aerosol filters
AlkalinityQuantity: number of stations = 9
Description: Dissolved inorganic carbon and alkalinity
AlkalinityQuantity: number of stations = 17
Description: Dissolved inorganic carbon and alkalinity
Trace elementsQuantity: number of samples = 68
Description: Clean trace metal fish samples for dissolved aluminium, iron & trace metals
IsotopesQuantity: number of stations = 7
Description: Lead isotopes
IsotopesQuantity: number of samples = 2
Description: Lead isotopes
Other chemical oceanographic measurementsQuantity: number of stations = 6
Description: Iron speciation
Contamination 
Trace metalsQuantity: number of stations = 4
Description: Titanium CTD bottle samples for dissolved manganese
Trace metalsQuantity: number of samples = 6
Description: Clean trace metal fish samples for dissolved manganese
Biology and fisheries 
ZooplanktonQuantity: number of experiments = 2
Description: Incubation experiments for microzooplankton grazing
ZooplanktonQuantity: number of experiments = 1
Description: Incubation experiments for microzooplankton grazing
Other biological/fisheries measurementQuantity: number of experiments = 2
Description: Two incubation experminets for bioluminescence
Other biological/fisheries measurementQuantity: number of stations = 39
Description: SEM coccolithophore counts
Other biological/fisheries measurementQuantity: number of stations = 9
Description: 45 samples from 9 stations for bioluminescence
Moorings, landers, buoys 
Physical oceanography 
Surface drifters/drifting buoys61° 59' 35" N  20° 5' 53" W — Buoy id: 300034012548820. Deployed at 18:48 GMT 13 May 2010. Buoy dropped by hand from the starboard stern-quarter. The apparent status after deployment was okay.
Surface drifters/drifting buoys60° 59' 49" N  20° 2' 26" W — Apex float SN 3865 (station 011 ib14)
Surface drifters/drifting buoys59° 59' 58" N  20° 2' 17" W — Apex float SN 3866 (station 015 ib12)
Surface drifters/drifting buoys59° 39' 19" N  19° 8' 17" W — Apex float SN 3863 (station 017 ib11)
Surface drifters/drifting buoys59° 24' 29" N  18° 25' 35" W — Apex Float SN 2704 (station 018 ib10). Note, this float ballasted for the Somali Basin
Surface drifters/drifting buoys59° 59' 58" N  20° 2' 17" W — Buoy id: 300034012347680. Deployed at 0838 GMT 16 May 2010. Buoy dropped by hand from the starboard stern quarter, 5m above sea level The apparent status after deployment was okay.
Surface drifters/drifting buoys57° 29' 20" N  11° 31' 30" W — Apex Float SN 3861 (Ellett station H)
Surface drifters/drifting buoys57° 20' 51" N  10° 40' 1" W — Apex Float SN 2705 (Ellett Station L)
Surface drifters/drifting buoys57° 16' 29" N  10° 21' 54" W — Apex Float SN 2635 (Ellett Station M)
Surface drifters/drifting buoys60° 59' 49" N  20° 2' 26" W — Buoy id: 300034012543300. Deployed at 11:20 GMT 15 May 2010. Buoy dropped by hand from the starboard stern quarter, 5m above sea level The apparent status after deployment was okay.
Surface drifters/drifting buoys58° 59' 53" N  17° 19' 14" W — Buoy id: 300034012547840. Deployed at 1725 GMT 17 May 2010. Buoy dropped by hand from the stern, 5m above sea level The apparent status after deployment was okay.
Surface drifters/drifting buoys57° 29' 49" N  11° 51' 44" W — Apex Float SN 3862 (Ellett station G)
Data held at BODC Get data
Discrete samples 
93  All plastic clean surface pumped supplyTotal metal concentrations in water bodies
Phosphate concentration parameters in the water column
Silicate concentration parameters in the water column
Nitrate concentration parameters in the water column
Chlorophyll pigment concentrations in water bodies
Dissolved metal concentrations in the water column
101  CTD frame plus rosette samplerTotal dissolved inorganic carbon (TCO2) concentration in the water column
Dissolved oxygen parameters in the water column
Total metal concentrations in water bodies
Phosphate concentration parameters in the water column
Salinity of the water column
Silicate concentration parameters in the water column
Nitrate concentration parameters in the water column
Chlorophyll pigment concentrations in water bodies
Dissolved metal concentrations in the water column
Alkalinity, acidity and pH of the water column
254  Sample taken from ship's non-toxic supplyTotal dissolved inorganic carbon (TCO2) concentration in the water column
Phosphate concentration parameters in the water column
Salinity of the water column
Silicate concentration parameters in the water column
Nitrate concentration parameters in the water column
Chlorophyll pigment concentrations in water bodies
Alkalinity, acidity and pH of the water column