RRS John Murray JM9/77 (B/7/77)
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | RRS John Murray (74MJ) |
| Cruise identifier | JM9/77 (B/7/77) |
| Cruise period | 1977-08-01 — 1977-08-13 |
| Status | Completed |
| Port of departure | Barry, United Kingdom |
| Port of return | Cardiff, United Kingdom |
| Purpose | Research |
| Objectives | Bristol Channel survey with the objectives:
1) To measure the spatial variability of dissolved organic and inorganic nutrients, phytoplankton and zooplankton. 2) To measure the fluxes of organic and inorganic nutrients between phytoplankton, heterotrophic microbes and omnivorous zooplankton and to measure the rates of primary and secondary production. 3) To make current meter measurements at 2 stations as a reconnaissance for long-term deployment of current meters. 4) To carry out preliminary trawling in Swansea and other bays. |
| Chief scientist | Alan W Morris (Institute of Marine Environmental Research, Plymouth) |
| Cruise report |  (0.15 MB) |
| Ocean/sea areas | |
| General | Bristol Channel |
| Track charts |  |
| Measurements | |
| Physical oceanography | |
| Surface measurements underway (T,S) | Quantity: track kilometres = 740.8 |
| Transparency (eg transmissometer) | Quantity: track kilometres = 740.8 |
| Chemical oceanography | |
| Phosphate | Quantity: track kilometres = 740.8 |
| Total - P | |
| Nitrate | Quantity: track kilometres = 740.8 |
| Nitrite | Quantity: track kilometres = 740.8 |
| Silicate | Quantity: track kilometres = 740.8 |
| Contamination | |
| Suspended matter | Quantity: track kilometres = 740.8 |
| Biology and fisheries | |
| Primary productivity | Quantity: number of stations = 21 |
| Phytoplankton pigs (eg chlorophyll, fluorescence) | Quantity: track kilometres = 740.8 |
| Dissolved organic matter (inc DOC) | Quantity: track kilometres = 740.8 |
| Phytoplankton | Quantity: number of stations = 21 Description: distribution,population |
| Zooplankton | Quantity: number of stations = 21 Description: distribution,population |
| Data held at BODC | |
| Discrete samples | |
| 710 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 Dissolved organic carbon concentration in the water column Silicate concentration parameters in the water column Phaeopigment concentrations in the water column Horizontal velocity of the water column (currents) Nitrate concentration parameters in the water column Chlorophyll pigment concentrations in water bodies |
| 31 Lowestoft Sampler | Zooplankton taxonomy-related abundance per unit volume of the water column Zooplankton non taxonomy-related abundance per unit volume of the water column Fish abundance in water bodies |
