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RRS Challenger CH120

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Challenger (74CH)
Cruise identifierCH120
Cruise period1995-07-18 — 1995-08-06
StatusCompleted
Port of departurePlymouth, United Kingdom
Port of returnArdrossan, United Kingdom
PurposeResearch
Objectives1) To service the DML LOIS Shelf Edge Study (SES) current mooring Y in the Tiree Passage.
2) To work the Anton Dohrn to Rockall Seamount CTD/nutrient/chlorophyll section (Ellett Line).
3) To recover the DML WOCE current meter mooring at station M (57° 18' N, 10° 23' W). This was not achieved.
4) To work CTD and water sampling sections along the SES lines N and S.
5) To measure rates of nitrogen fixation in the euphotic zone west of Scotland.
6) To collect large water samples over the shelf for Cs and Th isotope analysis.
7) To recover SES moorings from the shelf and slope regions.
8) To obtain multi-cores, gravity cores and box cores at SES stations S700, R1000, N1500 and N2000.
9) To trawl with an Agassiz trawl at deep and slope stations.
10) To obtain epibenthic sledge samples at station M in the Rockall Trough.
Chief scientistAnton Edwards (Dunstaffnage Marine Laboratory)
ProjectLOIS-SES
Coordinating bodyPlymouth Marine Laboratory
Ocean/sea areas 
GeneralInner Seas off the West Coast of Scotland
North East Atlantic Ocean (limit 40W)
SpecificNW Scotland
Track chartsRRS Challenger CH120 cruise track — ch120trk.html
Measurements 
Physical oceanography 
CTD stationsQuantity: number of stations = 52
Description: Oxygen received, but rejected
Chemical oceanography 
PhosphateQuantity: number of stations = 39
Description: Water bottle stations for nutrients and chlorophyll. Chlorophyll not held at BODC.
NitrateQuantity: number of stations = 39
Description: Water bottle stations for nutrients and chlorophyll. Chlorophyll not held at BODC.
AmmoniaQuantity: number of stations = 39
Description: Water bottle stations for nutrients and chlorophyll. Chlorophyll not held at BODC.
SilicateQuantity: number of stations = 39
Description: Water bottle stations for nutrients and chlorophyll. Chlorophyll not held at BODC.
RadioactivityQuantity: number of samples = 5
Description: Surface water samples for 137Cs
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of stations = 39
Description: Water bottle stations for nutrients and chlorophyll. Chlorophyll not held at BODC.
ZoobenthosQuantity: number of stations = 4
Description: Macrobenthos biomass
ZoobenthosQuantity: number of stations = 2
Description: Benthic trawls
Other biological/fisheries measurementQuantity: number of stations = 3
Description: Sediment oxygen demand and sulphate reduction rate incubations. SOD held by BODC.
Data held at BODC Get data
Discrete samples 
3  Box coreZoobenthos non taxonomy-related wet weight biomass per unit area of the bed
Zoobenthos taxonomy-related wet weight biomass per unit area of the bed
54  CTD frame plus rosette samplerDissolved total and organic nitrogen concentrations in the water column
Dissolved total or organic phosphorus concentration in the water column
Phosphate concentration parameters in the water column
Salinity of the water column
Temperature of the water column
Silicate concentration parameters in the water column
Density of the water column
Ammonium and ammonia concentration parameters in water bodies
Nitrate concentration parameters in the water column
Radioactivity in water bodies
3  Instrument mooring
8  MulticorerConcentration of organic matter in sediments
Other fluxes between the bed and the water column
Stable isotopes in sediment
Sediment water content, porosity and surface area
Concentration of inorganic sulphur species in sediment
Sediment grain size parameters
5  Sample taken from ship's non-toxic supplyRadioactivity in water bodies