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RRS Challenger CH84
Cruise summary report
Cruise Info. | |
Ship name (ship code) | RRS Challenger (74CH) |
Cruise identifier | CH84 |
Cruise period | 1991-09-05 — 1991-09-20 |
Status | Completed |
Port of departure | Dundee, United Kingdom |
Port of return | Greenock, United Kingdom |
Purpose | Research |
Objectives | 1. 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 scientist | M John Howarth (Proudman Oceanographic Laboratory) |
Cruise report | (0.58 MB) |
Ocean/sea areas | |
General | North Sea |
Specific | Northern North Sea, 59-61N:1W-3E |
Track charts | |
Measurements | |
Physical oceanography | |
Surface measurements underway (T,S) | Quantity: activity duration in days = 15 |
CTD stations | Quantity: number of profiles = 101 |
Subsurface temperature and salinity measurements | Quantity: track kilometres = 185.2 Description: SeaSoar - undulating CTD |
Current meters | Quantity: number of stations = 3 |
Current profiler (eg ADCP) | Quantity: activity duration in days = 15 Description: shipborne ADCP |
Geology and geophysics | |
Grab | Quantity: number of samples = 2 Description: Grab samples |
Moorings, landers, buoys | |
Physical oceanography | |
Subsurface temperature measurements | 59° 40' 0" N 0° 58' 59" E — Thermistor chain, also at 59 40N, 1E; 59 40N, 0 54E and 59 43N, 1E |
Subsurface temperature measurements | 59° 40' 0" N 1° 0' 0" E — Thermistor chain |
Current meters | 59° 53' 59" N 1° 0' 0" E — Two current meter moorings |
Current meters | 59° 40' 0" N 0° 31' 59" E — Two current meter moorings, recovered early |
Current meters | 59° 40' 0" N 1° 0' 0" E — Several current meter moorings - deployed for 50 days |
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 |
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 |
Surface drifters/drifting buoys | 59° 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 measurements | 59° 40' 0" N 1° 0' 0" E — Waverider |
Other physical oceanographic measurements | 59° 40' 0" N 1° 0' 0" E — Met. Buoy |
Data held at BODC | |
Discrete samples | |
97 CTD frame plus rosette sampler | Transmittance and attenuance of the water column Salinity of the water column Temperature of the water column Dissolved oxygen parameters in the water column Visible waveband radiance and irradiance measurements in the water column Density of the water column Raw light meter output Raw fluorometer output |