RRS Challenger CH8/76

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Challenger (74CH)
Cruise identifierCH8/76
Cruise period1976-05-19 — 1976-06-01
Port of departureArdrossan, United Kingdom
Port of returnBarry, United Kingdom
ObjectivesThe objectives of this cruise were:
1. Service the current meter mooring at 57N, 9W. Recovered but not relaid due to heavy fishing activity in the area.
2. Work the Rockall via Anton Dohrn Seamount (Ellett Line) hydrographic section. Accomplished.
3. Obtain live spiny crab larvae for Liverpool University Port Erin Laboratory.Net hauls successfully completed but very few crab larvae caught.
4. Work two deep stations in the Rockall Channel for particulate and trace metal analyses. One station successfully worked.
5. Lay three current meter moorings in the Sea of the Hebrides for the duration of the cruise. Only two were deployed due to equipment shortages. Both were successfully recovered.
6. Work a grid of STD stations in the Sea of the Hebrides with water bottle sampling for caesium, lead and radium isotope determination. STD grid and surface sampling completed, but only one near-bottom sample due to Niskin bottle failure.
7. Collection of large-volume surface water samples for radio-caesium measurements. Accomplished.
8. Obtain bottom grab samples for Aberystwyth University Geology Department. Shelf and Rockall Bank samples successfully obtained.
Chief scientistDavid J Ellett (Scottish Marine Biological Association)
Cruise reportRRS Challenger CH8/76 cruise report ch8_76.pdf (0.19 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
Track chartsRRS Challenger CH8/76 cruise track — trk1627a.html RRS Challenger CH8/76 cruise track — trk1627b.html
Physical oceanography 
Water bottle stationsQuantity: number of stations = 55
Description: S surface 3 T surface
CTD stationsQuantity: number of stations = 68
Current metersQuantity: number of deployments = 3
Description: 2x51d + 2x9d
Chemical oceanography 
Trace elements
RadioactivityQuantity: number of samples = 61
Description: (Cs,Pb & Ra)
Biology and fisheries 
ZooplanktonQuantity: number of samples = 19
Routine standard measurementsDescription: (syn.hours)
Geology and geophysics 
GrabQuantity: number of samples = 30