Cruise inventory

RRS Challenger CH74B

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Challenger (74CH)
Cruise identifierCH74B
Cruise period1991-02-01 — 1991-02-10
StatusCompleted
Port of departureBarry, United Kingdom
Port of returnBarry, United Kingdom
PurposeResearch
ObjectivesThe objectives of this cruise leg were:
1) To measure waves currents and near-bed turbulence and vertical current structure at two locations off Milford Haven, aligned with the main tidal stream and prevailing swell.
2) To measure the bedforms and suspended sediment concentrations at these stations and over the surrounding area.
Both objectives were accomplished.
Chief scientistJudith Wolf (Proudman Oceanographic Laboratory)
Cruise reportRRS Challenger CH74B cruise report ch74b_91.pdf — access key 'C' (0.60 MB) 
Ocean/sea areas 
GeneralBristol Channel
Celtic Sea
Track chartsRRS Challenger CH74B cruise track — trk3621.html
Measurements 
Physical oceanography 
Surface measurements underway (T,S)Quantity: activity duration in days = 8
CTD stationsQuantity: number of profiles = 68
Transparency (eg transmissometer)Quantity: activity duration in days = 8
Description: surface underway
Transparency (eg transmissometer)Quantity: number of profiles = 68
Current metersQuantity: number of stations = 4
Description: 4 cm deployed, 3 recovered
Other physical oceanographic measurementsQuantity: number of observations = 73
Description: (captures) ships radar measurements of wave spectra (under development)
Other physical oceanographic measurementsQuantity: number of image series = 48
Description: (films) ships radar measurements, photographic technique
Meteorology 
Routine standard measurementsQuantity: activity duration in days = 7
Description: hourly meteorological data recorded from ship
Geology and geophysics 
GrabQuantity: number of samples = 48
Description: for grain size analysis
Core - soft bottomQuantity: number of cores = 3
Description: sand over mud
Single-beam echosoundingQuantity: activity duration in days = 10
Description: echosounder every 10secs for 10 days
Moorings, landers, buoys 
Physical oceanography 
Current meters51° 30' 0" N  4° 45' 6" W — S4 current meter, 4m below surface, deployed, missing so not recovered (A4)
Current meters51° 30' 0" N  4° 45' 24" W — S4 current meter, 4m above bottom, deployed and recovered (A5)
Current meters51° 34' 5" N  4° 30' 17" W — S4 current meter, near bottom, deployed and recovered (B5)
Current meters51° 33' 47" N  4° 30' 29" W — S4 current meter, near-surface, deployed and recovered (B4)
Current profiler (eg ADCP)51° 29' 53" N  4° 44' 35" W — Sea floor ADCP, deployed and recovered (A3)
Current profiler (eg ADCP)51° 34' 12" N  4° 30' 0" W — Sea floor ADCP, deployed and recovered (B3)
Sea level (inc. bot. press., inverted echosounder)51° 29' 53" N  4° 44' 35" W — Bottom water level recorder, deployed and recovered (A3)
Sea level (inc. bot. press., inverted echosounder)51° 34' 12" N  4° 30' 0" W — Bottom water level recorder, deployed and recovered (B3)
Instrumented wave measurements51° 33' 35" N  4° 29' 35" W — Waverider, frequency spectra, deployed and recovered (B2)
Instrumented wave measurements51° 29' 48" N  4° 45' 6" W — WAVEC, deployed and recovered (A2)
Other physical oceanographic measurements51° 30' 6" N  4° 45' 6" W — STABLE II, turbulence meaasurements, currents and pressures (A1)
Other physical oceanographic measurements51° 34' 0" N  4° 30' 0" W — STABLE I,turbulent currents/pressure,acoustic suspended seds,sea-bed camera(B1)
Meteorology 
Other meteorological measurements51° 29' 35" N  4° 45' 29" W — Met. Buoy, deployed and recovered (A6)
Data held at BODC 
Discrete samples 
62  CTD frame plus rosette samplerDensity of the water column
Transmittance and attenuance of the water column
Salinity of the water column
Temperature of the water column