RRS Challenger CH3/75

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Challenger (74CH)
Cruise identifierCH3/75
Cruise period1975-03-04 — 1975-03-13
ObjectivesThe objectives of this cruise were:
1. Establish a current meter mooring at 57N, 9W. Deployed successfully, but a check on 11/03/1975 failed to locate it.
2. Work hydrographic sections across the Rockall Channel from 55° 34 min N, 8° 38 min W to Rockall Bank and from Rockall to 57N 9W via the Anton Dohrn Seamount (Ellett Line). The section from 57N to 9W started but abandoned due to bad weather. Malin Head to Rockall section worked successfully.
3. Collection of shelf sediment Shipek Grab samples for Aberystwyth University. Accomplished.
4. Working additional hydrographic sections. Not possible due to weather.
5. Collection of large-volume water samples for radio-caesium measurements. Accomplished
6. Testing and development of a data logging system for STD system. Accomplished.
7. Near real-time supply of temperature profiles to the Met Office. Accomplished.
Chief scientistDavid J Ellett (Scottish Marine Biological Association)
Cruise reportRRS Challenger CH3/75 cruise report ch3_75.pdf (0.12 MB) 
Ocean/sea areas 
GeneralInner Seas off the West Coast of Scotland
North East Atlantic Ocean (limit 40W)
SpecificRockall Bank
Physical oceanography 
Water bottle stationsQuantity: number of stations = 6
Description: 30 S surface
CTD stationsQuantity: number of stations = 20
Current metersQuantity: number of deployments = 1
Description: 2x2 days
Chemical oceanography 
RadioactivityQuantity: number of samples = 10
Description: surface water samples obtained for radio-caesium determination.
Routine standard measurements
Geology and geophysics 
GrabQuantity: number of deployments = 25
Description: Shipek grabs.
Moorings, landers, buoys 
Physical oceanography 
Current meters57° 0' 0" N  9° 0' 0" W — Current meter mooring deployed, but a check towards the end of the cruise revealed its loss.