RRS Challenger CH11/81

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Challenger (74CH)
Cruise identifierCH11/81
Cruise period1981-07-21 — 1981-08-04
ObjectivesThe purpose of this work was to observe and collect samples of sediment and organisms from the sea bed on the shelf and shelf edge west of Ireland. The observations were made by underwater TV and film cameras and the sediment samples collected by grabbing, dredging and coring. Information on the bedforms and thickness was obtained by geophysical profiling including side scan sonar, pinger, sparker and depth recording. Further data on the deep structure will be interpreted from gravity meter recordings. Water samples were collected and filtered and the suspended sediment will be analysed in conjunction with water temperature measurement to aid interpretation of overall hydrography of the area of Porcupine Bank.
Chief scientistT P Scoffin (University of Edinburgh Department of Geology)
Cruise reportRRS Challenger CH11/81 cruise report ch11_81.pdf (0.90 MB) 
Ocean/sea areas 
GeneralIrish Sea and St. George's Channel
SpecificWest of Ireland
Track chartsRRS Challenger CH11/81 cruise track — trk2615.html
Biology and fisheries 
PhytoplanktonQuantity: number of samples = 10
ZooplanktonQuantity: number of samples = 10
PhytobenthosQuantity: number of samples = 30
ZoobenthosQuantity: number of samples = 60
Other biological/fisheries measurementQuantity: number of samples = 10
Description: borers and foulers
Other biological/fisheries measurementQuantity: number of samples = 30
Description: attached plants and algae
Geology and geophysics 
DredgeQuantity: number of deployments = 78
GrabQuantity: number of deployments = 101
Description: 3 paleontology;geochronology
Core - soft bottomQuantity: number of stations = 3
Description: 86 physical/84 chemical analysis of sediments
Bottom photographyQuantity: number of deployments = 10
Description: and 20 motion picture
In-situ seafloor measurement/samplingQuantity: number of deployments = 8
Description: temp.
Long/short range side scan sonarQuantity: track kilometres = 45
Single channel seismic reflectionQuantity: track kilometres = 230
Gravity measurementsQuantity: track kilometres = 277.8