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RRS Discovery D78A
Cruise summary report
Cruise Info. | |
Ship name (ship code) | RRS Discovery (74E3) |
Cruise identifier | D78A |
Cruise period | 1976-09-08 — 1976-09-22 |
Status | Completed |
Port of departure | Barry, United Kingdom |
Port of return | Stornoway, United Kingdom |
Purpose | Research |
Objectives | The primary objective was to complete the northern portion of a circuit of tidal pressure recordings which has been determined piecemeal on a number of cruises since about 1970. The whole circuit encloses the part of the north-eastern Atlantic bounded in latitude by southern Iceland and Cape St. Vincent and in longitude by the mid-Atlantic ridge and the west European shelf edge. The present cruise covered three deep stations near the 30° Meridian from 53.5° northward and two stations of moderate depth on the Reykjanes Ridge and the Iceland-Faroe Rise respectively. Deployment of sea-bed capsules at these sites entailed some 5000miles of steaming altogether, so a fair margin had to be allowed on the first and last legs for possible delays due to weather. This left a rather short period between mooring and recovery of some capsules, but it was arranged that each site should have more than 15 days recording, which is about the minimum necessary for good tidal analysis. |
Chief scientist | David E Cartwright (Institute of Oceanographic Sciences Bidston Laboratory) |
Project | Oceanic Tidal Recording SE and SW of Iceland |
Cruise report | (9.90 MB) |
Ocean/sea areas | |
General | North East Atlantic Ocean (limit 40W) |
Track charts | |
Measurements | |
Physical oceanography | |
Surface measurements underway (T,S) | Description: Temperature only. |
Sea level (inc. bot. press., inverted echosounder) | Quantity: activity duration in days = 25 |
Meteorology | |
Incident radiation | Description: continuous recording |
Geology and geophysics | |
Single-beam echosounding | Quantity: track kilometres = 7408 |
Magnetic measurements | Quantity: track kilometres = 7408 |