RRS Challenger CH6B/81

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Challenger (74CH)
Cruise identifierCH6B/81
Cruise period1981-04-16 — 1981-04-25
Port of departureStornoway, United Kingdom
Port of returnArdrossan, United Kingdom
ObjectivesThe objectives of this cruise were:
(1) To service the IOS current meter moorings NE of Rockall (I1-I4) and retrieve and experimental mooring deployed at 56° 49 min N, 9° 16 min W. Accomplished.
(2) To re-lay the corrosion potential current meter mooring off South Uist. Accomplished.
(3) To measure chlorophyll concentrations over the shelf and shelf-edge. Accomplished.
(4) To work CTD sections across the shelf and shelf-edge. Five sections were worked from the full Rockall via Anton Dohrn Seamount (Ellett Line) section in the south northwards to a section from off the Butt of Lewis to 60N, 10W.
Chief scientistRoy Bowers (Scottish Marine Biological Association)
Cruise reportRRS Challenger CH6B/81 cruise report ch6_81.pdf (0.25 MB) 
Ocean/sea areas 
GeneralInner Seas off the West Coast of Scotland
North East Atlantic Ocean (limit 40W)
SpecificRockall Channel/ Scottish Cont. Shelf
Track chartsRRS Challenger CH6B/81 cruise track — trk2742.html RRS Challenger CH6B/81 cruise track — trk2742a.html
Physical oceanography 
Surface measurements underway (T,S)
Water bottle stationsDescription: S surface only
CTD stationsQuantity: number of stations = 58
Current metersQuantity: number of stations = 4
Description: ios stations;4 moorings with 11 c.m.recovered;4 deployed;195 days
Other physical oceanographic measurementsQuantity: number of deployments = 1
Description: corrosion potential c.m.deployed
Chemical oceanography 
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of samples = 32
Description: plus continuous surface chlorophyll measurements throughout the cruise