RRS Challenger CH11/83

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Challenger (74CH)
Cruise identifierCH11/83
Cruise period1983-08-10 — 1983-08-24
Port of departureDunstaffnage, United Kingdom
Port of returnDunstaffnage, United Kingdom
ObjectivesThe objectives of this cruise were:
(1) To service the current meter moorings at station M (Rockall Channel), Y (Tiree Passage) and J (Sound of Jura).
(2) To collect radiocaesium samples with CTD profiles on shelf sections from Mull of Galloway in the south to the Butt of Lewis in the north. Eleven sections worked.
(3) To sample chlorophyll and nutrients across the shelf and the slope to the west of the Hebrides. Three sections sampled plus continuous underway fluorometer.
(4) To service two UCNW shelf moorings and recover three more. Accomplished.
(5) To relocate current meter moorings and the Dundee satellite-interrogated temperature buoy (Kraksat).on the Hebridean Slope section west of South Uist to terrain less suited to fishing. Three of five current meter moorings plus Krakstat relocated.
(6) To recover an IOS Bidston tide gauge from mooring M in the Rockall Channel. Accomplished.
(7) To observe seabirds around the Hebrides. Accomplished.
(8) To work the Rockall via Anton Dohrn Seamount (Ellett Line) CTD section. Accomplished.
Chief scientistDavid J Ellett (Scottish Marine Biological Association)
Cruise reportRRS Challenger CH11/83 cruise report ch11_83.pdf (0.31 MB) 
Ocean/sea areas 
GeneralInner Seas off the West Coast of Scotland
North East Atlantic Ocean (limit 40W)
SpecificWest of Scotland
Track chartsRRS Challenger CH11/83 cruise track — trk2966.html
Physical oceanography 
Water bottle stationsQuantity: number of samples = 12
Description: S surface only
CTD stationsQuantity: number of stations = 107
Description: noisy salinity
Subsurface temperature measurementsQuantity: number of deployments = 2
Current metersQuantity: number of recoveries = 32
Description: no. of recovered;75 days
Other physical oceanographic measurements
Chemical oceanography 
AmmoniaQuantity: number of stations = 5
RadioactivityQuantity: number of samples = 87
Description: caesium
Other chemical oceanographic measurementsQuantity: number of stations = 19
Description: nutrients
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of stations = 36
Description: fluorometers