RRS John Murray JM7/78 (C/4/78)
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | RRS John Murray (74MJ) |
| Cruise identifier | JM7/78 (C/4/78) |
| Cruise period | 1978-06-23 — 1978-07-05 |
| Status | Completed |
| Port of departure | Barry, United Kingdom |
| Port of return | Barry, United Kingdom |
| Purpose | Research |
| Objectives | 1. To measure processes involved in the turnover of nitrogenous nutrients in a stratified water column (Celtic Sea) and a mixed water column (Carmarthen Bay).
2. To measure the feeding rates and development times of two species of copepod. |
| Chief scientist | Ian Joint (Institute of Marine Environmental Research, Plymouth) |
| Cruise report |  (0.12 MB) |
| Ocean/sea areas | |
| General | Irish Sea and St. George's Channel Bristol Channel |
| Track charts |  |
| Measurements | |
| Physical oceanography | |
| Surface measurements underway (T,S) | Description: continuous recording, 240nm approx. |
| Transparency (eg transmissometer) | Description: continuous recording, 240nm approx. |
| Chemical oceanography | |
| Phosphate | Description: continuous recording, 240nm approx. |
| Nitrate | Description: continuous recording, 240nm approx. |
| Nitrite | Description: continuous recording, 240nm approx. |
| Silicate | Description: continuous recording, 240nm approx. |
| Contamination | |
| Suspended matter | Description: continuous recording, 240nm approx. |
| Biology and fisheries | |
| Primary productivity | Quantity: number of stations = 3 |
| Phytoplankton pigs (eg chlorophyll, fluorescence) | Description: continuous recording, 240nm approx. |
| Particulate organic matter (inc POC, PON) | Quantity: number of stations = 147 |
| Dissolved organic matter (inc DOC) | Description: continuous recording, 240nm approx. |
| Phytoplankton | Quantity: number of stations = 50 |
| Zooplankton | Quantity: number of stations = 36 Description: energy transfers,biomass,distribution etc. studies |
| Seston | Quantity: number of stations = 147 |
| Pelagic bacteria/micro-organisms | Quantity: number of stations = 10 |
| Crustaceans | |
| Other biological/fisheries measurement | Quantity: number of stations = 147 Description: particle coulter counts |
| Data held at BODC | |
| Discrete samples | |
| 271 General station with STD/bottles/additional instruments | Nitrite concentration parameters in the water column Phosphate concentration parameters in the water column Salinity of the water column Temperature of the water column Dissolved organic carbon concentration in the water column Silicate concentration parameters in the water column Phaeopigment concentrations in the water column Nitrate concentration parameters in the water column Chlorophyll pigment concentrations in water bodies |
