Cruise inventory

RRS Challenger CH18

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Challenger (74CH)
Cruise identifierCH18
Cruise period1987-09-02 — 1987-09-25
Port of departureBarry, United Kingdom
Port of returnBarry, United Kingdom
Objectives1. To recover current meter moorings 108 and 109 deployed on Frederick Russell Cruise 2/87.
2. To deploy 2 short term current meter and thermistor chain rigs in the region of strong tidal flow on the continental slopes south of Chapel Bank to examine the production and generation of internal tides. These moorings (rigs 110 and 111) are to be deployed in depths of 2500m and 1000m and to be instrumented over most of the water column.
3. To deploy four long term current meter rigs in the Porcupine Sea Bight. These moorings (112, 113, 114, 115) are to be recovered on Challenger Cruise 31/88.
4. To make repeated runs with the Sea Soar, thermistor span and side-scan both at spring tides and neap tides to investigate internal wave proportion and near surface mixing.
5. To make CTD yoyos over a tidal cycle in the upper slope region and at increasing distances from the slopes. These are to be made in conjunction with the ADCP and the transmissometer to investigate mixing within the water column and the production of turbid layers near the bottom. Samples are to be drawn for inorganic nutrients, freon and Coulter Counter analyses.
6. To continously measure the surface values of temperature, salinity, fluorescence, light transmissions, inorganic nitrate, reactive silicate and to obtain samples for particle size, phytoplankton and zooplankton analyses.
7. To deploy these satellite tracked drifting buoys in the Porcupine Sea Bight.
Chief scientistRobin D Pingree (Marine Biological Association of the UK)
Cruise reportRRS Challenger CH18 cruise report ch18_87.pdf — access key 'C' (0.32 MB) 
Ocean/sea areas 
GeneralEnglish Channel
Bay of Biscay
SpecificNorth Atlantic
Track chartsRRS Challenger CH18 cruise track — trk3312.html
Physical oceanography 
Surface measurements underway (T,S)Quantity: track kilometres = 3333
Water bottle stationsQuantity: number of stations = 118
Description: surface only
CTD stationsQuantity: number of stations = 251
Subsurface temperature and salinity measurementsQuantity: track kilometres = 444.48
Description: seasoar 0-150m
Subsurface temperature measurementsQuantity: track kilometres = 148.16
Description: Thermistor Span 0-10m
Transparency (eg transmissometer)Quantity: track kilometres = 3333.6
Current metersQuantity: number of deployments = 17
Description: 20 deployed;15 days
Chemical oceanography 
NitrateQuantity: track kilometres = 3333.6
Biology and fisheries 
PhytoplanktonQuantity: track kilometres = 3333.6