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RRS Challenger CH10A/75

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Challenger (74CH)
Cruise identifierCH10A/75
Cruise period1975-07-04 — 1975-07-10
StatusCompleted
Port of departureDunstaffnage, United Kingdom
Port of returnArdrossan, United Kingdom
PurposeResearch
ObjectivesThe objectives of this cruise were:
(1) Deploying a current meter mooring at 57N, 9W. Accomplished, but status not checked at the end of the cruise due to time lost through Challenger assisting a trawler in distress.
(2) Work the Rockall via Anton Dohrn Seamount (Ellett Line) and Rockall-Malin Head hydrographic sections. Accomplished.
(3) Net tows to collect crab larvae for Liverpool University Port Erin Laboratory. Tows successfully undertaken but crab larvae were not found.
(4) Collection of shelf sediment Shipek Grab samples for Aberystwyth University. Accomplished.
(5) Collection of large-volume water samples for radio-caesium measurements. Accomplished
(6) Near real-time supply of temperature profiles to the Met Office. Accomplished.
Chief scientistDavid J Ellett (Scottish Marine Biological Association)
Cruise reportRRS Challenger CH10A/75 cruise report ch10a_75.pdf (0.08 MB) 
Ocean/sea areas 
GeneralInner Seas off the West Coast of Scotland
North East Atlantic Ocean (limit 40W)
SpecificRockall Bank, Malin Shelf
Measurements 
Physical oceanography 
CTD stationsQuantity: number of stations = 29
Chemical oceanography 
RadioactivityQuantity: number of samples = 10
Description: Large-volume samples for radio-caesium determination.
Biology and fisheries 
ZooplanktonQuantity: number of hauls = 23
Description: Oblique and vertical 50cm plankton net tows
Geology and geophysics 
GrabQuantity: number of deployments = 7
Description: Shipek grab samples
Moorings, landers, buoys 
Physical oceanography 
Current meters57° 0' 0" N  9° 0' 0" W — Current meter mooring deployed