RRS Challenger CH2/84

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Challenger (74CH)
Cruise identifierCH2/84
Cruise period1984-06-23 — 1984-07-08
Port of departureArdrossan, United Kingdom
Port of returnFalmouth, United Kingdom
ObjectivesThe objectives of this cruise were:
(1) To deploy three current meter moorings in the North Channel for the duration of the cruise. Re-lay one of the three for recovery by RV Clione. Moorings deployed and recovered, but no data from one due to collapse of the sub-surface buoyancy. Redeployment accomplished.
(2) To work CTD sections across the shelf from the Mull of Galloway and the North Minch. Fifteen sections worked with five covering the North Channel, three between the Outer Hebrides and the shelf edge and seven between Hebridean islands and the mainland.
(3) To collect large-volume water samples for radiocaesium analysis from three depths at each of the ten standard stations between the Sound of Mull and the shelf edge. Accomplished.
(4) To collect nutrient, chlorophyll and phytoplankton production data on the outer shelf and slope. Accomplished.
(5) To deploy a current meter mooring at station Y in the Tiree Passage. Accomplished.
(6) To visit current meter moorings at F, M, V and W to recover any surviving equipment and re-lay mooring F. Nothing found. Mooring re-deployed.
(7) To search for the Dundee University Kraksat satellite-interrogated buoy. No trace found.
(8) To work the Rockall via Anton Dohrn Seamount (Ellett Line) CTD section. Accomplished from the shelf edge to Rockall Bank.
Chief scientistDavid J Ellett (Scottish Marine Biological Association)
Cruise reportRRS Challenger CH2/84 cruise report ch2_84.pdf (0.26 MB) 
Ocean/sea areas 
GeneralInner Seas off the West Coast of Scotland
Irish Sea and St. George's Channel
North East Atlantic Ocean (limit 40W)
SpecificNorth Atlantic
Track chartsRRS Challenger CH2/84 cruise track — trk3200.html RRS Challenger CH2/84 cruise track — trk3200a.html
Physical oceanography 
Water bottle stationsQuantity: number of stations = 129
Description: S surface 120 bottom
CTD stationsQuantity: number of stations = 120
Description: noisy upper layers
Current metersQuantity: number of deployments = 13
Description: 6 recovered;11 days-4 months
Surface drifters/drifting buoysQuantity: number of deployments = 147
Description: bottom
Chemical oceanography 
OxygenQuantity: number of stations = 61
NitrateQuantity: number of stations = 51
NitriteQuantity: number of stations = 51
SilicateQuantity: number of stations = 51
RadioactivityQuantity: number of samples = 111
Description: water samples for radio-caesium analysis.
Other chemical oceanographic measurementsQuantity: number of stations = 16
Description: C14,Carbonate uptaken
Contaminants in organismsQuantity: number of stations = 5
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of stations = 92
PhytoplanktonQuantity: number of stations = 30
ZooplanktonQuantity: number of stations = 9
Description: toxicology studies