RRS Discovery D82A
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | RRS Discovery (74E3) |
| Cruise identifier | D82A |
| Cruise period | 1977-03-21 — 1977-04-12 |
| Status | Completed |
| Port of departure | Gibraltar, Gibraltar |
| Port of return | Dakar, Senegal |
| Purpose | Research |
| Objectives | The objectives of leg 1 were to locate a patch of water distinctive for its biological, chemical and physical characteristics. To study the distribution of these characteristics both within and outside the patch and the time scale of change in these characteristics. An alternative objective was to study these characteristics across frontal systems. The area of study chosen was between 20 degrees N and 23 degrees N off the north-west African coast as both newly upwelled patches of water could be expected, and the frontal systems in the area are clearly defined and their physical structure well documented. |
| Chief scientist | Martin V Angel (Institute of Oceanographic Sciences Wormley Laboratory) |
| Project | Upwelling off NW Africa and Total Column Sampling Around 20N 21W |
| Cruise report |  (16.63 MB) |
| Ocean/sea areas | |
| General | North East Atlantic Ocean (limit 40W) |
| Track charts |  |
| Measurements | |
| Physical oceanography | |
| CTD stations | Quantity: number of stations = 33 |
| Subsurface temperature and salinity measurements | Quantity: number of stations = 3 |
| Optics (eg underwater light levels) | Quantity: number of stations = 14 |
| Surface drifters/drifting buoys | Quantity: number of deployments = 18 |
| Chemical oceanography | |
| Oxygen | Description: continuous sampling |
| Phosphate | Description: continuous sampling |
| Nitrite | Description: continuous sampling |
| Silicate | Description: continuous sampling |
| Biology and fisheries | |
| Primary productivity | Quantity: number of stations = 11 |
| Phytoplankton pigs (eg chlorophyll, fluorescence) | Quantity: number of samples = 22 |
| Phytoplankton | Quantity: number of samples = 12 |
| Zooplankton | Quantity: number of samples = 124 |
| Seston | Quantity: number of samples = 22 |
| Meteorology | |
| Routine standard measurements | Description: continuous sampling |
