Cruise inventory

RRS Challenger CH78

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Challenger (74CH)
Cruise identifierCH78
Cruise period1991-04-23 — 1991-05-09
StatusCompleted
Port of departureBarry, United Kingdom
Port of returnBarry, United Kingdom
PurposeResearch
Objectives1. To evaluate the hydrodynamic processes controlling the resuspension of sediment at a muddy coastal site in the Irish Sea.
2. To evaluate the influence of sedimentological characteristics and geotechnical and geophysical properties of the bed on resuspension.
3. To examine the role of benthic organisms in sediment resuspension and deposition processes.
4. To determine the impact of sediment resuspension on water quality through its influence on trace metal and nutrient exchange processes.
5. To develop a detailed model of interrelating vertical current structure and suspended sediment concentration at a point site and to use this model as the basis for constructing a fine grid, three dimensional model of the observational area.
Chief scientistAlan W Morris (Plymouth Marine Laboratory)
Cruise reportRRS Challenger CH78 cruise report ch78_91.pdf — access key 'C' (0.26 MB) 
Ocean/sea areas 
GeneralIrish Sea and St. George's Channel
SpecificIrish Sea
Track chartsRRS Challenger CH78 cruise track — ch78_91trk.pdf (0.02 MB) 
Measurements 
Physical oceanography 
Water bottle stationsQuantity: number of deployments = 15
Description: near-bed multiple-depth water bottle sampler under test
CTD stationsQuantity: number of profiles = 187
Current metersQuantity: number of stations = 3
Description: 8 cm deployed & recovered
Other physical oceanographic measurementsQuantity: number of experiments = 26
Description: particle settling velocity measurements (QUISSET)
Chemical oceanography 
PhosphateQuantity: number of profiles = 17
Description: near-bed multiple-depth water bottle sampler
PhosphateQuantity: number of measurements = 12
Description: sediment pore water
NitrateQuantity: number of profiles = 17
Description: near-bed multiple-depth water bottle sampler
NitrateQuantity: number of measurements = 12
Description: sediment pore water
AmmoniaQuantity: number of profiles = 17
Description: near-bed multiple-depth water bottle sampler
AmmoniaQuantity: number of measurements = 12
Description: sediment pore water
SilicateQuantity: number of measurements = 12
Description: sediment pore water
SilicateQuantity: number of profiles = 17
Description: near-bed multiple-depth water bottle sampler
AlkalinityQuantity: number of measurements = 12
Description: sediment pore water
Trace elementsQuantity: number of measurements = 12
Description: sediment pore water
Biology and fisheries 
Sediment trapsQuantity: number of deployments = 4
Description: (x 12 hour deployments) sediment traps - trapping efficiency/chemical analysis
ZoobenthosQuantity: number of samples = 12
Description: box cores
MolluscsQuantity: number of samples = 12
Description: box cores
Geology and geophysics 
Core - soft bottomQuantity: number of deployments = 12
Description: box corer for chemical, geotechnical and biological measurements
Moorings, landers, buoys 
Physical oceanography 
Transparency (eg transmissometer)54° 7' 0" N  3° 28' 0" W — 2 transmissometers on above current meter rig
Transparency (eg transmissometer)54° 7' 0" N  3° 28' 0" W — 2 transmissometers on above current meter rig
Current meters54° 7' 0" N  3° 28' 0" W — 2 current meters - deployed 25 Apr 1991, recovered 06 May 1991
Current meters54° 7' 0" N  3° 28' 0" W — 2 current meters - deployed 24 April 1991, recovered 07 May 1991
Current meters54° 7' 0" N  3° 28' 0" W — 2 current meters - deployed 24 April 1991, recovered 07 May 1991
Current meters54° 7' 0" N  3° 28' 0" W — 2 current meters - deployed 25 Apr 1991, recovered 06 May 1991
Current profiler (eg ADCP)54° 7' 0" N  3° 28' 0" W — Sea floor ADCP - deployed 25 April 1991, recovered 26 April 1991
Current profiler (eg ADCP)54° 7' 0" N  3° 28' 0" W — Sea floor ADCP - deployed 01 May 1991, recovered 02 May 1991
Current profiler (eg ADCP)54° 7' 0" N  3° 28' 0" W — Sea floor ADCP - deployed 25 April 1991, recovered 06 May 1991
Current profiler (eg ADCP)54° 7' 0" N  3° 28' 0" W — Sea floor ADCP - deployed 30 April 1991, recovered 01 May 1991
Instrumented wave measurements54° 7' 0" N  3° 28' 0" W — Waverider - deployed 25 April 1991, recovered 06 May 1991
Other physical oceanographic measurements54° 7' 0" N  3° 28' 0" W — STABLE - deployed 26 April 1991, recovered 06 May 1991
Meteorology 
Other meteorological measurements54° 7' 0" N  3° 28' 0" W — Met. buoy - deployed 24 April 1991, recovered 07 May 1991
Data held at BODC 
Discrete samples 
183  CTD frame plus rosette samplerDissolved metal concentrations in the water column
Density of the water column
Visible waveband radiance and irradiance measurements in the water column
Transmittance and attenuance of the water column
Silicate concentration parameters in the water column
Concentration of suspended particulate material in the water column
Salinity of the water column
Temperature of the water column
Nitrate concentration parameters in the water column
Nitrite concentration parameters in the water column
Phosphate concentration parameters in the water column