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RRS Discovery D46_leg2
Cruise summary report
Cruise Info. | |
Ship name (ship code) | RRS Discovery (74E3) |
Cruise identifier | D46_leg2 |
Cruise period | 1972-05-04 — 1972-05-24 |
Status | Completed |
Port of departure | Barry, United Kingdom |
Port of return | Plymouth, United Kingdom |
Purpose | Research |
Objectives | Leg 2 of 3 of D46
1) Test newly built componets of the 'Minimode' acoustic float tracking system 2) To get the 'Minimode' acoustic float tracking system fully functional 3) To operate the 'Minimode' acoustic float tracking system on a large enough scale to show whether the propsed 1973 experiment is feasible. 4) Electric hydrographic winch trials 5) Current meter Spar trials Calibration runs for the electromagnetic logs were made, relative to a surface drogue |
Chief scientist | John C Swallow (National Institute of Oceanography) |
Cruise report | (0.99 MB) |
Ocean/sea areas | |
General | Bristol Channel |
Track charts | (0.02 MB) |
Measurements | |
Physical oceanography | |
Water bottle stations | Description: T surface only |
CTD stations | Quantity: number of stations = 15 Description: Rosette multisampler stations |
Subsurface temperature and salinity measurements | Quantity: number of samples = 48 Description: From 45 stations. Measurements taken from 50m to 2800m depth |
Neutrally buoyant floats | Quantity: number of experiments = 3 Description: Serial no.233 probable depth 1830-1875m, no.234 1790-1835m, and no.235 1775-1815m. Nominal depth of 1800m. |
Other physical oceanographic measurements | Quantity: number of measurements = 16 Description: Dip samples taken with the protas (probe recording ocean temperature and shear). Measurements of velocity and temperature gradients down to a depth of 1500m. Trials carried out with equipment |
Biology and fisheries | |
Gear research | Quantity: activity duration in hours = 74.5 Description: Electric (4.2 hours) and mechanical (70 hours) hydrographic winch trials |
Meteorology | |
Incident radiation | |
Occasional standard measurements | |
Geology and geophysics | |
Multi-beam echosounding | Quantity: number of measurements = 5 Description: Sound sources were tracked simultaneously during the acuostic trials of the MODE Float Tracking system. Echo soundings were taken on passage in deep water. |
Moorings, landers, buoys | |
Physical oceanography | |
Current meters | 47° 32' 17" N 8° 23' 24" W — Mooring no.108. Reocvered from station 7775 after 148 days in the water |
Current meters | 47° 29' 53" N 8° 24' 36" W — Mooring no.116 laid to test a 5.1 kHz transponder. Recovered from station 7869, 9 day period. 2 current meters incorporated into mooring |
Current meters | 53° 33' 5" N 18° 35' 29" W — Mooring no.118 containing 3 current meters. Recovered from station 7895. |
Current meters | 52° 28' 59" N 17° 45' 0" W — Mooring no.117 containing 4 current meters. Recovered from station 7889. |