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RRS Challenger CH9

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Challenger (74CH)
Cruise identifierCH9
Cruise period1987-01-08 — 1987-01-22
StatusCompleted
Port of departureOban, United Kingdom
Port of returnCampbeltown, United Kingdom
PurposeResearch
Objectives1. To collect large volume water samples for radio-caesium analysis along a line of stations Sound of Mull - Barra Head - Shelf edge for MAFF, Lowestoft and elsewhere for University of Glasgow.
2. To service SMBA mooring "Y" in the Tiree Passage.
3. To work CTD stations along a line Sound of Mull - Barra Head - Anton Dohrn Seamount (Ellett Line) - Rockall.
4. To work CTD stations along sections in the Minch.
5. To work CTD stations, collect water samples for nutrient and phytoplankton determination and to measure light attenuation along various sections on the continental shelf north of Malin, in the Clyde Sea and Irish Sea.
6. To use an acoustic doppler current profiler to examine currents over the Great Plateau and in the Arran Deep in the Clyde Sea.
7. To collect sediment cores in the Irish Sea.
8. To service and relay current meter moorings in the Clyde Sea.
9. To collect zooplankton samples under various conditions on the shelf and in the Clyde Sea.
Chief scientistAnton Edwards (Scottish Marine Biological Association)
Cruise reportRRS Challenger CH9 cruise report ch9_87.pdf (0.27 MB) 
Ocean/sea areas 
GeneralInner Seas off the West Coast of Scotland
North East Atlantic Ocean (limit 40W)
SpecificN.E. Atlantic (West of Scotland, The Minches, North Channel and Clyde Approaches)
Track chartsRRS Challenger CH9 cruise track — trk3300.html RRS Challenger CH9 cruise track — trk3300a.html
Measurements 
Physical oceanography 
Water bottle stationsQuantity: number of stations = 136
Description: S only 110 bottom
CTD stationsQuantity: number of stations = 119
Optics (eg underwater light levels)Quantity: number of stations = 12
Description: irradiance meter
Current metersQuantity: number of stations = 4
Description: 6 deployed;3 month
Chemical oceanography 
PhosphateQuantity: number of stations = 56
NitrateQuantity: number of stations = 56
AmmoniaQuantity: number of stations = 56
SilicateQuantity: number of stations = 56
RadioactivityQuantity: number of samples = 111
Description: samples for radio-caesium analysis.
Biology and fisheries 
Primary productivityQuantity: number of stations = 3
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of stations = 58
ZooplanktonQuantity: number of surveys = 2
Description: survey:distribution,biomass determination,energy transfers,population structures