RRS Challenger CH75B

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Challenger (74CH)
Cruise identifierCH75B
Cruise period1991-02-23 — 1991-03-03
Port of departureOban, United Kingdom
Port of returnTroon, United Kingdom
Objectives1. To work the Anton Dohrn Seamount (Ellett Line) CTD section to maintain a WOCE time series.
2. To collect large volume water samples and CTD profiles at standard positions between the Sound of Mull and the shelf-edge for radiocaesium studies.
3. To service the DML current meter mooring in the Tiree Passage.
Chief scientistDavid J Ellett (Dunstaffnage Marine Laboratory)
Coordinating bodyWOCE SSG
Cruise reportRRS Challenger CH75B cruise report ch75_91.pdf (0.44 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
SpecificScottish Continental Shelf, Rockall Trough, N. Channel
Track chartsRRS Challenger CH75B cruise track — trk3864.html
Physical oceanography 
Surface measurements underway (T,S)Quantity: number of samples = 11
Description: salinity samples, Rockall Trough and North Channel
BathythermographQuantity: number of profiles = 12
Description: XBT along Rockall-Malin Head Section
CTD stationsQuantity: number of stations = 59
Current metersQuantity: number of stations = 1
Description: 1 cm deployed
Biology and fisheries 
PhytobenthosQuantity: number of hauls = 5
Description: Multiple corer & Epibenthic sled hauls
ZoobenthosQuantity: number of deployments = 8
Description: Multiple corer, Agassiz trawls & Epibenthic sled hauls
Pelagic fishQuantity: number of hauls = 1
Description: Rectangular midwater trawl
Demersal fishQuantity: number of hauls = 9
Description: Rectangular midwater trawl, Otter trawls & Agassiz trawls
Moorings, landers, buoys 
Physical oceanography 
Current meters56° 37' 0" N  6° 24' 0" W — Mooring laid 24 Feb recovery in July, sounding 47m, Aanderaa cms at 27m & 37m