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RRS Challenger CH105

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Challenger (74CH)
Cruise identifierCH105
Cruise period1993-09-03 — 1993-09-16
StatusCompleted
Port of departureOban, United Kingdom
Port of returnArdrossan, United Kingdom
PurposeResearch
Objectives1. To make CTD profiles and to collect water samples for nutrient and phytoplanktonic analysis at standard positions between the Sound of Mull and the shelf edge West of Barra.
2. To maintain the DML current meter mooring in the Tiree Passage.
3. To deploy an RDI broadband acoustic Doppler profiler (ADCP) on a trial mooring prior to its eventual deployment in the Agulhas Current as part of WOCE.
4. To collect a suite of physical, biological and chemical profiles and sea-bed samples (multicorer and Craib corers) at the shelf edge as part of the LOIS studies.
5. To recover and redeploy a temperature and salinity recorder with thermistor chain at station M of the Anton Dohrn section.
6. To work the CTD stations of the Anton Dohrn Seamount (Ellett Line) section between the shelf-edge and Rockall to continue the Rockall Trough times series as a UK contribution to WOCE goal . To collect nuitrient and phytoplankton samples along this line.
7. To work CTD, nutrient and phytoplankton sections in the Clyde Sea area as a part of the MAST 2 "PROFILE" project.
8. To launch POL satellite tracked drogues in the North Channel in preparation for "Challenger" cruise 106.
9. To measure water column and sea surface conditions on the continental shelf in the swath of ERS-1 satellite overpasses on the 12th and 13th of September.
10. To collect material from the core of the Scottish Continental Slope Current, adjacent shelf waters and the Rockall Trough to study zooplankton indicator species there.
11. To collect live copepods, Plueromamma robusta (Giesbrecht, 1889).
Chief scientistAnton Edwards (Dunstaffnage Marine Laboratory)
ProjectWOCE/LOIS-SES
Coordinating bodyIOC/WMO (within UK James Rennell Centre)/NERC/EU MAST
Cruise reportRRS Challenger CH105 cruise report ch105_93.pdf (0.76 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
SpecificRockall Trough, W Scottish Shelf Edge, Sea of Hebrides, Firth of Clyde
Track chartsRRS Challenger CH105 cruise track — trk3952.html
Measurements 
Physical oceanography 
Surface measurements underway (T,S)Quantity: activity duration in days = 13
Description: temperature in near surface water
CTD stationsQuantity: number of profiles = 90
Description: 16-profile time series 12/13 Sep,corresponding to ERS1 satellite overpasses
Chemical oceanography 
PhosphateQuantity: number of stations = 74
NitrateQuantity: number of stations = 74
NitriteQuantity: number of stations = 74
AmmoniaQuantity: number of stations = 74
SilicateQuantity: number of stations = 74
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of stations = 74
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of profiles = 90
Description: 16-profile time series 12/13 Sep,corresponding to ERS1 satellite overpasses
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: activity duration in days = 13
Description: temperature in near surface water
Biochemical measurements (eg lipids, amino acids)Quantity: number of experiments = 9
Description: sediment oxygen uptake. Studies & sediment carbon/nitrogen content
ZooplanktonQuantity: number of hauls = 40
Description: 7 RMT1+7 oblique and stepped tows & 33 Neuston net
Geology and geophysics 
Core - soft bottomQuantity: number of experiments = 9
Description: sediment oxygen uptake. Studies & sediment carbon/nitrogen content
Moorings, landers, buoys 
Physical oceanography 
Subsurface temperature measurements57° 17' 59" N  10° 23' 12" W — 50m therm. chain & SeaCat t-S logger rec. 4 Sep.
Subsurface temperature measurements57° 17' 59" N  10° 23' 12" W — 50m therm. chain & SeaCat t-S logger depl. 7 Sep.
Current meters56° 37' 30" N  6° 24' 6" W — Mooring serviced 10 Sep. 2 Aanderaa CMs at 26m and 36m depth in sounding of 46m
Current profiler (eg ADCP)56° 39' 35" N  9° 35' 42" W — RDI ADCP depl.4 Sep. at 500m, Aanderaa CMs at 500m and 600m, water depth 1650m
Surface drifters/drifting buoys54° 59' 41" N  5° 29' 24" W — Drifting Argos buoys depl. 14 Sep
Surface drifters/drifting buoys54° 44' 17" N  5° 27' 53" W — Drifting Argos buoys depl. 14 Sep
Surface drifters/drifting buoys54° 51' 29" N  5° 13' 0" W — Drifting Argos buoys depl. 14 Sep
Surface drifters/drifting buoys54° 46' 12" N  5° 22' 54" W — Drifting Argos buoys depl. 14 Sep
Surface drifters/drifting buoys54° 46' 12" N  5° 22' 47" W — Drifting Argos buoys depl. 14 Sep
Surface drifters/drifting buoys54° 48' 24" N  5° 17' 59" W — Drifting Argos buoys depl. 14 Sep
Surface drifters/drifting buoys54° 48' 24" N  5° 17' 59" W — Drifting Argos buoys depl. 14 Sep
Other physical oceanographic measurements57° 17' 59" N  10° 23' 12" W — (as above). Depl. 16 May 1993
Other physical oceanographic measurements57° 17' 59" N  10° 23' 12" W — (as above) at nominal depth 674m depth in 2224m sounding