Cruise inventory

RRS Discovery D176

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Discovery (74E3)
Cruise identifierD176
Cruise period1988-07-22 — 1988-08-22
Port of departureLisbon, Portugal
Port of returnSanta Cruz de Tenerife, Spain
Objectives1. To recover sediment trap and Bathysnap moorings previously laid in the Porcupine Seabight.
2. To attempt to recover a amphipod trap at the EEC Site.
3. To carry out biological, chemical and physical investigations at the BIOTRANS Site to study the flux of particles throughout the water column. These investigations to include:-
(a) Sediment trap moorings to assess the sedimentation rate of particles, and to provide material for biological and chemical analysis.
(b) In situ particle counting to profile particle size distribution throughout the water column. This should enable the assessment of mass particle concentration.
(c) Large volume filtration systems to provide material for chemical analyses.
(d) Net collection of plankton and micronekton to assess their vertical distribution, diel migrations, and role in trophic transformations and vertical transport of particulate carbon.
(e) Collection of surface sediments for biological and chemical analyses.
(f) Assessment of phytoplankton and bacterial biomass in the euphotic zone, with measurements of flagellate grazing potential.
Chief scientistHarry Elderfield (University of Cambridge Department of Earth Sciences)
Cruise reportRRS Discovery D176 cruise report d176.pdf — access key 'C' (0.87 MB) 
Ocean/sea areas 
GeneralNorth West Atlantic Ocean (limit 40W)
SpecificCentral Atlantic, 26 08 20N;044 49 40W
Track chartsRRS Discovery D176 cruise track — trk3397.html
Physical oceanography 
CTD stationsQuantity: number of stations = 12
Subsurface temperature and salinity measurementsQuantity: number of samples = 9
Current metersQuantity: number of deployments = 5
Description: 5 deployed;15 days
Chemical oceanography 
Other dissolved gasesQuantity: number of samples = 25
PhosphateQuantity: number of samples = 30
SilicateQuantity: number of samples = 150
Trace elementsQuantity: number of samples = 200
RadioactivityQuantity: number of samples = 25
IsotopesQuantity: number of samples = 25
Trace metalsQuantity: number of samples = 200
Geology and geophysics 
DredgeQuantity: number of deployments = 3
Core - soft bottomQuantity: number of cores = 7