Cruise inventory

RRS Discovery D203A

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Discovery (74E3)
Cruise identifierD203A
Cruise period1993-07-02 — 1993-07-15
StatusCompleted
Port of departureGibraltar, Gibraltar
Port of returnNice, France
PurposeResearch
Objectives1) To investigate the exchange fluxes of nutrients, trace metals, and organic matter between the Western Mediterranean basin and Atlantic at the Straits of Gibraltar, and with the Eastern Mediterranean along the Straits of Sicily
2) The concentrations and speciations of dissolved metals include: Fe, Ni, Co, Cd, Pb, Zn, Cu, Al, were determined from surface to deep (2660 m) waters along a track from Gibraltar to Sicily. The particulate from these metals were sampled using the Stand Alone Pumps (SAPS).
3) The distribution of nutrients (nitrite, nitrate, silicate, ammonium, phosphate) were determined at their nanomolar levels in order to map the severe biological depletion in these oligotrophic waters.
4) An undulating oceanographic recorder (UOR) was towed between all stations to obtain upper ocean sections of salinity, temperature, fluorescence and bio-optics.
5) The photosynthetic status (production rates, nutrient limitation, light limitation, etc) of the phytoplankton was assessed using a novel US submersible Fast Flash Fluorometer
Chief scientistR Fauzi C Mantoura (Plymouth Marine Laboratory)
ProjectEROS 2000 MAST
Coordinating bodyDG XII, European Community, Environment Programme
Cruise reportRRS Discovery D203A cruise report d203.pdf — access key 'C' (11.93 MB) 
Ocean/sea areas 
GeneralMediterranean Sea - Western basin
SpecificWest and north west Mediterranean Sea, Gibraltar Straits, Sicily Straits, Gulf du Lions
Track chartsRRS Discovery D203A cruise track — d203atrk.pdf (00 MB) 
Measurements 
Physical oceanography 
CTD stationsQuantity: number of profiles = 46
Description: CTD frame with fluorometer, transmissometer and light meters
Subsurface temperature and salinity measurementsQuantity: number of deployments = 50
Description: UOR tows
Transparency (eg transmissometer)Quantity: number of profiles = 46
Description: CTD frame with fluorometer, transmissometer and light meters
Optics (eg underwater light levels)Quantity: number of deployments = 50
Description: UOR tows
Optics (eg underwater light levels)Quantity: number of profiles = 46
Description: CTD frame with fluorometer, transmissometer and light meters
Chemical oceanography 
OxygenQuantity: number of profiles = 46
Description: CTD frame with fluorometer, transmissometer and light meters
Other dissolved gasesQuantity: number of samples = 31
Description: analysis of 26 H2O2 & 5 Methylammonia samples
PhosphateQuantity: number of measurements = 24
Description: nutrient structures for inflow and export of water
PhosphateQuantity: number of profiles = 26
Description: 12 depths
NitrateQuantity: number of measurements = 24
Description: nutrient structures for inflow and export of water
NitrateQuantity: number of profiles = 26
Description: 12 depths
NitriteQuantity: number of measurements = 24
Description: nutrient structures for inflow and export of water
NitriteQuantity: number of profiles = 26
Description: 12 depths
AmmoniaQuantity: number of measurements = 24
Description: nutrient structures for inflow and export of water
SilicateQuantity: number of profiles = 26
Description: 12 depths
SilicateQuantity: number of measurements = 24
Description: nutrient structures for inflow and export of water
Other chemical oceanographic measurementsQuantity: number of samples = 160
Description: unfiltered seawater (100-150ml), distribution of organic fluorophores
Contamination 
Suspended matterQuantity: number of stations = 17
Description: deep pumping of particles - 60 samples
Trace metalsQuantity: number of stations = 13
Description: trace metal fluxes
Trace metalsDescription: Trace metal speciation
Trace metalsQuantity: number of stations = 8
Description: electroactive trace metals
Biology and fisheries 
Primary productivityQuantity: number of samples = 40
Description: production
Primary productivityQuantity: number of experiments = 2
Description: fluorescence used to assess primary productivity in two methods
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of profiles = 46
Description: CTD frame with fluorometer, transmissometer and light meters
Dissolved organic matter (inc DOC)Quantity: number of samples = 40
Description: DOC
Moorings, landers, buoys 
Biology and fisheries 
Primary productivity43° 47' 59" N  3° 43' 59" E — prim. prod. in situ rig, 6 depths to 95m, 14C, 15N, O2
Primary productivity43° 17' 59" N  4° 49' 0" E — prim. prod. in situ rig, 6 depths to 95m, 22 Jul, 14C, 15N, O2
Primary productivity43° 6' 0" N  4° 55' 59" E — prim. prod. in situ rig, 6 depths to 95m, 28 Jul, 14C, 15N, O2
Primary productivity40° 58' 59" N  6° 1' 59" E — prim. prod. in situ rig, 6 depths to 95m, 18 Jul, 14C, 15N, O2
Primary productivity40° 45' 0" N  6° 4' 59" E — prim. prod. in situ rig, 6 depths to 95m, 20 Jul, 14C, 15N, O2
Primary productivity42° 10' 0" N  5° 22' 0" E — prim. prod. in situ rig, 6 depths to 95m, 24 Jul, 14C, 15N, O2
Primary productivity42° 43' 59" N  5° 4' 59" E — prim. prod. in situ rig, 6 depths to 95m, 26 Jul, 14C, 15N, O2
Sediment traps41° 0' 0" N  6° 0' 0" E — sediment trap, 18 Jul 1993
Sediment traps43° 47' 59" N  3° 43' 59" E — sediment trap, 3 Jul 1993
Data held at BODC 
Discrete samples 
46  CTD frame plus rosette samplerDensity of the water column
Transmittance and attenuance of the water column
Visible waveband radiance and irradiance measurements in the water column
Chlorophyll pigment concentrations in water bodies
Raw fluorometer output
Salinity of the water column
Raw light meter output
Temperature of the water column
Dissolved oxygen parameters in the water column