RRS Challenger CH15/76

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Challenger (74CH)
Cruise identifierCH15/76
Cruise period1976-10-07 — 1976-10-16
Port of departureArdrossan, United Kingdom
Port of returnArdrossan, United Kingdom
ObjectivesThe objectives of this cruise were:
(1) Re-lay the current meter mooring at 57N, 9W. Accomplished.
(2) Work the Rockall via Anton Dohrn Seamount (Ellett Line) STD section. Accomplished.
(3) Recover two IOS deep-sea moorings. Accomplished.
(4) Drag for the IOS mooring lost in a deployment accident on CH12/76. Unsuccessful.
(5) Calibrate the 2-component EM-log. Not possible due to loss of mooring spar buoy radar reflector.
(6) Take continuous surface temperature and salinity measurements using an STD in a bucket. Accomplished.
(7) Temperature and salinity profiling using batfish, STD, CTD and STD in the vicinity of IOS moorings J1 and J2. Significant progress made, but limited due to mechanical problems with the batfish and XBT recorder.
(8) Collect large-volume surface water samples on the Scottish shelf for radiocaesium analysis. Accomplished.
Chief scientistRoy Bowers (Scottish Marine Biological Association)
Cruise reportRRS Challenger CH15/76 cruise report ch15_76.pdf (0.26 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
Track chartsRRS Challenger CH15/76 cruise track — trk1797.html
Physical oceanography 
Surface measurements underway (T,S)
Surface measurements underway (T,S)Quantity: number of measurements = 21
Description: 15 S surface 6 T surface
BathythermographQuantity: number of profiles = 17
CTD stationsQuantity: number of stations = 18
Subsurface temperature and salinity measurementsQuantity: number of deployments = 3
Description: (batfish)
Current metersQuantity: number of stations = 5445
Description: 6x62d + 2x61d
Chemical oceanography 
RadioactivityQuantity: number of samples = 10
Description: (134/137Cs)
Routine standard measurementsDescription: (syn.hours)
Geology and geophysics 
Multi-beam echosounding