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RRS Challenger CH6A/81

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Challenger (74CH)
Cruise identifierCH6A/81
Cruise period1981-04-06 — 1981-04-15
StatusCompleted
Port of departureBarry, United Kingdom
Port of returnStornoway, United Kingdom
PurposeResearch
ObjectivesThe objectives of this cruise were:
(1) To service current meter moorings at station R (shelf: 57N, 9W) and re-lay current meter moorings at stations M (deep water: 57° 18 min N, 10° 23 min W) and F (deep water: 57.5N, 12.25W). Accomplished.
(2) To sample benthos in the southern and central Rockall Trough. Successful epibenthic sled and Agassiz trawl hauls at the SMBA permanent station and station M.
(3) To recover the corrosion potential current meter mooring off South Uist. Accomplished.
(4) To work the Rockall via Anton Dohrn Seamount (Ellett Line) CTD section. Stations R (shelf) to O (deep water between the slope and the seamount) of the section worked. Additional CTD sections on the shelf worked from Loch Moidart past Oigh Sgeir and at right angles into Loch Bracadale, Skye.
(5) To determine bottom topography at future mooring sites to the west of Porcupine Bank. Accomplished.
(6) To collect large-volume surface water samples for radiocaesium analysis, accompanied by CTD profiles, at stations across the Scottish continental shelf. Accomplished with CTD profiles on all but one station.
Chief scientistDavid J Ellett (Scottish Marine Biological Association)
Cruise reportRRS Challenger CH6A/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 CH6A/81 cruise track — trk2740.html RRS Challenger CH6A/81 cruise track — trk2740a.html
Measurements 
Physical oceanography 
CTD stationsQuantity: number of stations = 29
Current metersQuantity: number of stations = 1
Description: mooring(2 c.m.)recovered and not relaid;36 days
Other physical oceanographic measurementsQuantity: number of deployments = 75
Description: one corrosion potential c.m.
Chemical oceanography 
RadioactivityQuantity: number of samples = 10
Description: radionuclides
Biology and fisheries 
ZooplanktonQuantity: number of hauls = 1
ZoobenthosQuantity: number of hauls = 2
Description: survey:taxonomy,population