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RRS Challenger CH97

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Challenger (74CH)
Cruise identifierCH97
Cruise period1992-09-25 — 1992-10-06
StatusCompleted
Port of departureOban, United Kingdom
Port of returnOban, 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 contribution to WOCE goal 2.
4. To work the Rockall to Malin Head CTD section for further investigation of recent water mass changes west of Britain.
5. To work shelf CTD sections in the Sea of the Hebrides and the North Channel as time permits.
6. To collect large volume water samples west of the Hebrides and samples for iodine concentration determination.
Chief scientistAnton Edwards (Dunstaffnage Marine Laboratory)
ProjectWOCE
Coordinating bodyWOCE IPO
Cruise reportRRS Challenger CH97 cruise report ch97_92.pdf (0.86 MB) 
Ocean/sea areas 
GeneralInner Seas off the West Coast of Scotland
North East Atlantic Ocean (limit 40W)
SpecificNE Atlantic and Scottish continental shelf, Rockall Trough/Bank, Sea of the Hebrides, North Channel, Firth of Clyde
Track chartsRRS Challenger CH97 cruise track — trk3799.html
Measurements 
Physical oceanography 
CTD stationsQuantity: number of stations = 118
Description: oxygens rejected due to lack of calibration
Current metersQuantity: number of stations = 1
Description: 2 cms
Chemical oceanography 
RadioactivityQuantity: number of samples = 14
Description: samples for thorium analysis
RadioactivityQuantity: number of samples = 10
Description: Radiocaesium sampling, Mull - shelf-edge
Biology and fisheries 
Benthic bacteria/micro-organismsQuantity: number of cores = 6
Description: Craib corer samples
Moorings, landers, buoys 
Physical oceanography 
Subsurface temperature measurements57° 16' 0" N  10° 22' 0" W — 50m thermistor chain at ca.400m in soundings of 2236m. Deployed 27 Sept.
Current meters56° 37' 0" N  6° 24' 0" W — Mooring serviced 25 Sept. 2 cms at 11m & 22m above seabed, water depth 42m
Other physical oceanographic measurements57° 16' 0" N  10° 22' 0" W — SeaCat temperature/salinity logger, attached to thermistor chain