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FS Poseidon PO314

Cruise summary report

Cruise Info. 
Ship name (ship code)FS Poseidon (06PO)
Cruise identifierPO314
Cruise period2004-07-11 — 2004-07-23
StatusCompleted
Port of departureGlasgow, United Kingdom
Port of returnReykjavík, Iceland
PurposeResearch
ObjectivesThe "Extended Ellett Line" Scotland - Rockall - Iceland Time Series
The objectives of the cruise were:
1. To observe water mass properties, the instantaneous velocity field and subsequently the heat and salt (fresh water) fluxes between the subpolar gyre and the Nordic Seas in 2004.
2. To compare the 2004 conditions with those observed in the previous years (to 1975 in the Rockall Trough, 1988 in the Iceland Basin), quantifying the interannual to decadal changes in properties and understanding the causal mechanisms of variability.
3. To enhance the physical and tracer measurements with biological observations to investigate nutrient cycling, export production, ecosystem structure and dynamics.
The time series is designed to observe the warm saline inflow to the Nordic Seas and the cold dense overflow returning to the North Atlantic, quantifying interannual variation in heat and salt fluxes between the two basins. The Ellett Line time series has been occupied since 1975 and has revealed interannual to decadal scale variability in properties and fluxes, including a significant rise in temperature over the last 5 years. The extension to Iceland increases the usefulness of the original section by monitoring the North Atlantic Current extension, the recirculation of the eastern subpolar gyre, and the Iceland-Scotland overflow. The extension to Iceland has been occupied almost annually since 1988 and has revealed upper ocean mode water variabiity of order 1-1.5°C and 0.15 psu over 5-10 year periods.
Chief scientistJane F Read (Southampton Oceanography Centre)
Coordinating bodyJames Rennell Division, SOC
Cruise reportFS Poseidon PO314 cruise report poseidon_314.pdf (30 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
Measurements 
Physical oceanography 
Surface measurements underway (T,S)Quantity: track kilometres = 3140
Description: Underway thermosalinograph: temperature, conductivity
Water bottle stationsQuantity: number of samples = 331
Description: Salinity samples drawn from CTD rosette
CTD stationsQuantity: number of profiles = 73
Description: SBE CTD with dissolved oxygen and fluorimeter
Current profiler (eg ADCP)Quantity: number of profiles = 58
Description: Lowered ADCP
Current profiler (eg ADCP)Quantity: track kilometres = 3140
Description: Vessel mounted ADCP
Chemical oceanography 
OxygenQuantity: number of samples = 629
Description: Dissolved oxygen samples drawn from CTD rosette
Total - PQuantity: number of samples = 722
Description: Macro nutrient samples N, P, Si, from CTD rosette
Total - NQuantity: number of samples = 722
Description: Macro nutrient samples N, P, Si, from CTD rosette
SilicateQuantity: number of samples = 722
Description: Macro nutrient samples N, P, Si, from CTD rosette
Contamination 
Trace metalsQuantity: number of samples = 13
Description: Surface sample for iron
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of samples = 9
Description: HPLC samples taken from the sea surface
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of samples = 106
Description: Chlorophyll a samples drawn from CTD rosette
PhytoplanktonQuantity: number of samples = 9
Description: Fast repitition rate fluorimeter samples from sea surface
Meteorology 
Routine standard measurementsQuantity: track kilometres = 3140
Description: Underway meteorology; wind sp & dirn., air temp, press, humidity, water temp
Geology and geophysics 
Single-beam echosoundingQuantity: track kilometres = 3140
Description: Depth
Moorings, landers, buoys 
Physical oceanography 
Surface drifters/drifting buoys57° 31' 0" N  12° 15' 0" W — Apex float deployed as part of the Argos programme
Surface drifters/drifting buoys57° 19' 0" N  10° 22' 59" W — Apex float deployed as part of the Argos programme
Data held at BODC Get data
Discrete samples 
73  CTD frame plus rosette samplerPhosphate concentration parameters in the water column
Salinity of the water column
Dissolved oxygen parameters in the water column
Silicate concentration parameters in the water column
Nitrate concentration parameters in the water column