Resources

RRS Challenger CH103

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Challenger (74CH)
Cruise identifierCH103
Cruise period1993-05-12 — 1993-05-24
StatusCompleted
Port of departureCampbeltown, United Kingdom
Port of returnOban, United Kingdom
PurposeResearch
Objectives1. 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 2.
2. To moor a temperature-salinity recorder and thermistor chain at station M of the Anton Dohrn Section.
3. To collect a suite of profiles, samples and cores at the shelf-edge west of Barra to continue DML LOIS Shelf-Edge Study (SES) pilot surveys.
4. To service the DML current meter mooring in the Tiree Passage.
5. To work selected stations of the Malin Head - Rockall CTD section for further investigation of recent water mass changes west of Britain.
6. To work shelf CTD, nutrient and coring stations in the Firth of Clyde as part of the DML/UCNW MAST 2 PROFILE programme.
7. An additional aim was a request received from Professor Simpson just before sailing for the redeployment of a current meter mooring and guard marker in the outer Firth of Clyde.
Chief scientistDavid J Ellett (Dunstaffnage Marine Laboratory)
ProjectWOCE/LOIS-SES
Coordinating bodyWOCE SSG/NERC/MAST
Cruise reportRRS Challenger CH103 cruise report ch103_93.pdf (0.64 MB) 
Ocean/sea areas 
GeneralInner Seas off the West Coast of Scotland
North East Atlantic Ocean (limit 40W)
SpecificWest Scottish coast to Rockall, 55-57N; 5-15W
Track chartsRRS Challenger CH103 cruise track — trk3854.html
Measurements 
Physical oceanography 
Surface measurements underway (T,S)Description: Continuous thermosalinograph
CTD stationsQuantity: number of stations = 73
Description: oxygens rejected Rockall & shelf edge sections
Transparency (eg transmissometer)Quantity: number of stations = 2
Description: recovered & relaid
Current metersQuantity: number of stations = 2
Description: recovered & replaced
Other physical oceanographic measurements
Chemical oceanography 
PhosphateQuantity: number of stations = 58
NitrateQuantity: number of stations = 58
NitriteQuantity: number of stations = 58
AmmoniaQuantity: number of stations = 58
SilicateQuantity: number of stations = 58
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of stations = 73
Description: oxygens rejected Rockall & shelf edge sections
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of recoveries = 1
Description: moored fluorometer recovered
Biochemical measurements (eg lipids, amino acids)Quantity: number of experiments = 7
Description: sediment oxygen uptake
Biochemical measurements (eg lipids, amino acids)Quantity: number of cores = 9
Description: cores for carbon/nitrogen analysis and bacterial biomass
ZooplanktonQuantity: number of hauls = 5
Description: 3 vertical & 2 RMT-1 stratified
NeustonQuantity: number of hauls = 9
Description: Neuston net
Moorings, landers, buoys 
Physical oceanography 
Subsurface temperature measurements57° 17' 59" N  10° 22' 59" W — 50m - 16 May 1993, -SeaCat logger
Transparency (eg transmissometer)55° 32' 59" N  4° 55' 59" W — laid 22 May. Surface transparency only
Transparency (eg transmissometer)58° 37' 59" N  5° 1' 0" W — as above
Current meters56° 37' 59" N  6° 24' 0" W — replaced 21 May, 2 Aanderaas at 27 & 38m
Current meters58° 37' 59" N  5° 1' 0" W — recovered 22 May 1993
Other physical oceanographic measurements57° 17' 59" N  10° 22' 59" W — SeaCat Ts logger at 1720m depth in 2220m water
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)58° 37' 59" N  5° 1' 0" W — as above