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RRS Challenger CH81

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Challenger (74CH)
Cruise identifierCH81
Cruise period1991-07-01 — 1991-07-08
StatusCompleted
Port of departureDunstaffnage, United Kingdom
Port of returnTroon, United Kingdom
PurposeResearch
Objectives1. To collect CTD profiles and large-volume water samples at standard positions between the Sound of Mull and the shelf-edge west of Barra for radiocaesium studies.
2. To service the DML current meter mooring in the Tiree Passage.
3. To work the CTD stations of the Anton Dohrn Seamount (Ellett Line) section, between the shelf-edge and Rockall, to continue the Rockall Trough time-series as a UK contribution to WOCE Goal 3.
4. To work the Rockall - Malin Head CTD section for further investigation of recent water mass changes west of Britain.
5. To collect Craib cores for microbiological enrichment studies at 3-4 sites.
6. To work shelf CTD sections in the Sea of the Hebrides and North Channel as time permits.
7. To collect wave data for POL using the ship's radar.
Chief scientistDavid J Ellett (Dunstaffnage Marine Laboratory)
ProjectWOCE
Cruise reportRRS Challenger CH81 cruise report ch81_91.pdf (0.15 MB) 
Ocean/sea areas 
GeneralInner Seas off the West Coast of Scotland
North East Atlantic Ocean (limit 40W)
SpecificScottish continental shelf and Rockall Channel
Track chartsRRS Challenger CH81 cruise track — trk3699.html
Measurements 
Physical oceanography 
BathythermographQuantity: number of profiles = 4
Description: XBT along Rockall-Malin Head section
CTD stationsQuantity: number of stations = 48
Current metersQuantity: number of deployments = 1
Description: 2 cms deployed
Chemical oceanography 
RadioactivityQuantity: number of stations = 10
Description: Radiocaesium sampling, Mull to shelf edge
Biology and fisheries 
Biochemical measurements (eg lipids, amino acids)Quantity: number of cores = 6
Description: cores - Craib cores for microbiological studies
Moorings, landers, buoys 
Physical oceanography 
Current meters56° 37' 0" N  6° 24' 0" W — Mooring laid 1 July for recovery Nov 1991, Sounding 47m, cms at 27 & 37m depth