RRS John Murray JM18/75 (B/12/75)
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | RRS John Murray (74MJ) |
| Cruise identifier | JM18/75 (B/12/75) |
| Cruise period | 1975-12-09 — 1975-12-18 |
| Status | Completed |
| Port of departure | Barry, United Kingdom |
| Port of return | Barry, United Kingdom |
| Purpose | Research |
| Objectives | Bristol Channel survey with additional stations off the North Cornish coast. |
| Chief scientist | Alan W Morris (Institute of Marine Environmental Research, Plymouth) |
| Ocean/sea areas | |
| General | Irish Sea and St. George's Channel Bristol Channel |
| Track charts |  |
| Measurements | |
| Physical oceanography | |
| Surface measurements underway (T,S) | Quantity: track kilometres = 1131.572 |
| Water bottle stations | Quantity: number of profiles = 76 Description: Surface plus 2 bottom water samples |
| Transparency (eg transmissometer) | Quantity: track kilometres = 1131.572 |
| Current meters | Quantity: number of deployments = 2 Description: 50 hours |
| Chemical oceanography | |
| Phosphate | Quantity: track kilometres = 1131.572 |
| Nitrate | Quantity: track kilometres = 1131.572 |
| Silicate | Quantity: track kilometres = 1131.572 |
| Contamination | |
| Trace metals | Quantity: number of profiles = 60 |
| Data held at BODC | |
| Discrete samples | |
| 400 General station with STD/bottles/additional instruments | Salinity of the water column Temperature of the water column Concentration of suspended particulate material in the water column Dissolved organic carbon concentration in the water column Horizontal velocity of the water column (currents) |
