Cruise inventory

RRS Challenger CH84

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Challenger (74CH)
Cruise identifierCH84
Cruise period1991-09-05 — 1991-09-20
StatusCompleted
Port of departureDundee, United Kingdom
Port of returnGreenock, United Kingdom
PurposeResearch
Objectives1. To deploy and maintain 22 moorings at 9 sites (A - I) within 25km of 59º 40'N 1º 00'E.
2. To measure vertical, horizontal and temporal variations of temperature, salinity and currents around the moorings using CTD, SeaSoar and ship ADCP systems.
3. To deploy and recover drogued driting buoys.
4. To make detailed depth and sea-bed (grab and photographic) surveys in the immediate vicinity of the moorings.
Chief scientistM John Howarth (Proudman Oceanographic Laboratory)
Cruise reportRRS Challenger CH84 cruise report ch84_91.pdf — access key 'C' (0.58 MB) 
Ocean/sea areas 
GeneralNorth Sea
SpecificNorthern North Sea, 59-61N:1W-3E
Track chartsRRS Challenger CH84 cruise track — trk3739.html
Measurements 
Physical oceanography 
Surface measurements underway (T,S)Quantity: activity duration in days = 15
CTD stationsQuantity: number of profiles = 101
Subsurface temperature and salinity measurementsQuantity: track kilometres = 185.2
Description: SeaSoar - undulating CTD
Current metersQuantity: number of stations = 3
Current profiler (eg ADCP)Quantity: activity duration in days = 15
Description: shipborne ADCP
Geology and geophysics 
GrabQuantity: number of samples = 2
Description: Grab samples
Moorings, landers, buoys 
Physical oceanography 
Subsurface temperature measurements59° 40' 0" N  0° 58' 59" E — Thermistor chain, also at 59 40N, 1E; 59 40N, 0 54E and 59 43N, 1E
Subsurface temperature measurements59° 40' 0" N  1° 0' 0" E — Thermistor chain
Current meters59° 40' 0" N  0° 31' 59" E — Two current meter moorings, recovered early
Current meters59° 40' 0" N  1° 0' 0" E — Several current meter moorings - deployed for 50 days
Current meters59° 53' 59" N  1° 0' 0" E — Two current meter moorings
Current profiler (eg ADCP)59° 40' 0" N  0° 31' 59" E — ADCP on sea bed
Current profiler (eg ADCP)59° 53' 59" N  1° 0' 0" E — ADCP on sea floor
Current profiler (eg ADCP)59° 40' 0" N  0° 49' 0" E — ADCP on sea bed, also at 59 45N, 1E
Current profiler (eg ADCP)59° 40' 0" N  1° 0' 0" E — Two ADCPs on sea bed
Surface drifters/drifting buoys59° 53' 59" N  1° 0' 0" E — 6 drifting buoys deployed, 5 recovered
Sea level (inc. bot. press., inverted echosounder)59° 53' 59" N  1° 0' 0" E — Pressure recorder attached to ADCP
Sea level (inc. bot. press., inverted echosounder)59° 40' 0" N  1° 0' 0" E — Pressure recorder on sea bed
Sea level (inc. bot. press., inverted echosounder)59° 40' 0" N  0° 31' 59" E — Pressure recorder attached to ADCP
Instrumented wave measurements59° 40' 0" N  1° 0' 0" E — Waverider
Other physical oceanographic measurements59° 40' 0" N  1° 0' 0" E — Met. Buoy
Data held at BODC 
Discrete samples 
97  CTD frame plus rosette samplerDensity of the water column
Transmittance and attenuance of the water column
Visible waveband radiance and irradiance measurements in the water column
Raw fluorometer output
Salinity of the water column
Raw light meter output
Temperature of the water column
Dissolved oxygen parameters in the water column