Resources

RRS Challenger CH112

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Challenger (74CH)
Cruise identifierCH112
Cruise period1994-04-28 — 1994-05-13
StatusCompleted
Port of departureBarry, United Kingdom
Port of returnOban, United Kingdom
PurposeResearch
Objectives1. To service the POL ADCP mooring in the North Channel on the passage north from Barry to Campbeltown.
2. To work the CTD stations of the Anton Dohrn Seamount (Ellett Line) section, between the shelf-edge and Rockall in order to continue the Rockall Trough time-series as a UK contribution to WOCE Goal 2.
3. To recover and redeploy a temperature-salinity recorder and thermistor chain at station M of the Anton Dohrn Section.
4. To service the DML current meter mooring in the Tiree Passage.
5. To sample benthos at Station M using the epibenthic sled and the Agassiz trawl.
6. To collect a suite of physical, nutrient and biological profiles and samples, including multi-coring, at the shelf-edge west of Barra as part of the LOIS pilot studies.
7. To work shelf-edge - Sound of Mull CTD section, with nutrient and tracer sampling.
8. To collect grab samples of the bottom deposits at stations 1D to 4D west of Islay for SURRC analysis.
9. To work the PROFILE sampling stations around the Arran deep, as time permits.
Chief scientistDavid J Ellett (Dunstaffnage Marine Laboratory)
ProjectWOCE/LOIS-SES
Coordinating bodyIOC/WMO-JRC in UK/NERC PML
Cruise reportRRS Challenger CH112 cruise report ch112_94.pdf (0.45 MB) 
Ocean/sea areas 
GeneralInner Seas off the West Coast of Scotland
North East Atlantic Ocean (limit 40W)
SpecificNE Atlantic, Rockall Trough, W.Scottish cont. Shelf, W of Hebrides
Track chartsRRS Challenger CH112 cruise track — trk4002.html
Measurements 
Physical oceanography 
CTD stationsQuantity: number of stations = 84
Description: incl. 19 Rockall-shelf edge sections Oxygen received, but rejected
Chemical oceanography 
PhosphateQuantity: number of stations = 65
Description: sections across shelf edge/upon shelf W of Scotland
NitrateQuantity: number of stations = 65
Description: sections across shelf edge/upon shelf W of Scotland
NitriteQuantity: number of stations = 65
Description: sections across shelf edge/upon shelf W of Scotland
AmmoniaQuantity: number of stations = 65
Description: sections across shelf edge/upon shelf W of Scotland
SilicateQuantity: number of stations = 65
Description: sections across shelf edge/upon shelf W of Scotland
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of stations = 65
Description: sections across shelf edge/upon shelf W of Scotland
PhytobenthosQuantity: number of hauls = 1
Description: Agassiz trawl
ZoobenthosQuantity: number of hauls = 1
Description: Agassiz trawl
ZoobenthosQuantity: number of hauls = 2
Description: Epibenthic sledge
Geology and geophysics 
GrabQuantity: number of samples = 5
Description: grab samples to establish bottom type
Core - soft bottomQuantity: number of deployments = 8
Description: Craib corer to establish bottom type
Moorings, landers, buoys 
Physical oceanography 
Subsurface temperature measurements57° 17' 59" N  10° 24' 0" W — 50m thermistor chain, depl. 7 May, at depth 685m in 2225m water depth
Current meters56° 37' 59" N  6° 24' 0" W — Mooring serviced 9 May. 2 Aanderaa cms at 23m & 33m, sounding 43m
Current profiler (eg ADCP)54° 46' 0" N  5° 24' 0" W — Moored ADCP rec. 29 Apr, redepl. 30 Apr, water depth 147m
Other physical oceanographic measurements57° 17' 59" N  10° 24' 0" W — SeaCat t-S logger with thermistor chain above