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RRS Challenger CH12A/75

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Challenger (74CH)
Cruise identifierCH12A/75
Cruise period1975-08-26 — 1975-09-02
StatusCompleted
Port of departureDunstaffnage, United Kingdom
Port of returnDunstaffnage, United Kingdom
PurposeResearch
ObjectivesThe cruise had 6 objectives.
1. Recovery and relaying of a current meter mooring at 57N 9W.
2. Working the hydrographic sections to Anton Dohrn Seamount (Ellett Line) and Rockall and Rockall-Malin Head (Rosemary Bank to St Kilda also worked due to favourable conditions).
3. Using a submersible pump and autoanalyser for nutrient determinations along these sections.
4. Collecting Shipek grab samples of shelf sediments for Aberystwyth University.
5. Collecting large volume water samples for radio-caesium analysis by the Fisheries Radiobiological Laboratory.
6. Transmitting temperature profiles to the Met Office at Bracknell based on STD traces.
All objectives were successfully achieved.
Chief scientistDavid J Ellett (Scottish Marine Biological Association)
Cruise reportRRS Challenger CH12A/75 cruise report ch12a_75.pdf (0.12 MB) 
Ocean/sea areas 
GeneralInner Seas off the West Coast of Scotland
North East Atlantic Ocean (limit 40W)
SpecificMalin Shelf, Rockall, Anton Dohrn Seamount
Track chartsRRS Challenger CH12A/75 cruise track — trk1458a.html
Measurements 
Physical oceanography 
CTD stationsQuantity: number of stations = 21
Chemical oceanography 
RadioactivityQuantity: number of samples = 10
Description: surface water samples for radio-caesium analysis.
Geology and geophysics 
GrabQuantity: number of samples = 30
Description: obtained using Shipek grab.