RRS Discovery D68
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | RRS Discovery (74E3) |
| Cruise identifier | D68 |
| Cruise period | 1974-11-01 — 1974-12-15 |
| Status | Completed |
| Port of departure | Barry, United Kingdom |
| Port of return | Barry, United Kingdom |
| Purpose | Research |
| Objectives | The itinerary was planned to enable a number of shallow and deep tidal pressure sensors to be laid on an L-shaped plan consisting roughly of the 10 meridian from west of Ushant to west of Cape St. Vincent, and the 37 parallel between Cape St. Vincent and the Azores. As usual this required an initial period for laying sea-bed capsules and two shallow current meters, and a final period of recovery on the return voyage (Legs 1&3). The intermediate period (leg 2) was used primarily for geophysical seismic profiles and magnetometric/bathymetric surveys northeast of the Azores, for testing various pieces of mechanical and acoustic equipment by the IOS-W engineering and applied physics groups and some tests of disposable containers for the UK Atmoic Energy Authority. |
| Chief scientist | David E Cartwright (Institute of Oceanographic Sciences Bidston Laboratory) |
| Cruise report |  (12.19 MB) |
| Ocean/sea areas | |
| General | North East Atlantic Ocean (limit 40W) |
| Track charts |  |
| Measurements | |
| Physical oceanography | |
| Bathythermograph | |
| CTD stations | Quantity: number of stations = 1 |
| Current meters | Quantity: 2 Description: 40 days |
| Sea level (inc. bot. press., inverted echosounder) | Quantity: 6 Description: (30 Days) |
| Other physical oceanographic measurements | Quantity: number of profiles = 2 Description: sound velocity stations |
| Biology and fisheries | |
| Zooplankton | Quantity: 8 Description: survey distribution, population etc. |
| Nekton | Quantity: 16 |
| Geology and geophysics | |
| Multi-beam echosounding | Quantity: track kilometres = 11112 |
| Single channel seismic reflection | Quantity: track kilometres = 2963 |
| Magnetic measurements | Quantity: track kilometres = 6667.2 |
