RRS John Murray JM3/80 (B/4/80)
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | RRS John Murray (74MJ) |
| Cruise identifier | JM3/80 (B/4/80) |
| Cruise period | 1980-05-19 — 1980-05-29 |
| Status | Completed |
| Port of departure | Barry, United Kingdom |
| Port of return | Barry, United Kingdom |
| Purpose | Research |
| Objectives | 1) To continue the series of 5 'MULEX' cruises designed to quantify nutrient cycling processes in Carmarthen Bay, including;
A) Nutrient excretion rates of the zooplankton assemblage. B) Nutrient demand rates by the phytoplankton assemblage C) Nutrient regeneration rates byt the Benthos D) Nitrification/dentrification process by bacteria E) Nutrient advection and diffusion from surrounding regions to Carmarthen Bay 2) To continue the monitoring of the Bristol Channel and Severn Estuary. |
| Chief scientist | Peter H Burkill (Institute of Marine Environmental Research, Plymouth) |
| Cruise report |  (0.22 MB) |
| Ocean/sea areas | |
| General | Bristol Channel |
| Track charts |  |
| Measurements | |
| Physical oceanography | |
| Surface measurements underway (T,S) | Description: Cont. over 10 day period of cruise. |
| Transparency (eg transmissometer) | Description: Cont. over 10 day period of cruise. |
| Chemical oceanography | |
| Phosphate | Description: Cont. over 10 day period of cruise. |
| Total - P | Description: Cont. over 10 day period of cruise. |
| Nitrate | Description: Cont. over 10 day period of cruise. |
| Nitrite | Description: Cont. over 10 day period of cruise. |
| Silicate | Description: Cont. over 10 day period of cruise. |
| Contamination | |
| Suspended matter | Description: Cont. over 10 day period of cruise. |
| Biology and fisheries | |
| Primary productivity | Quantity: number of stations = 6 |
| Phytoplankton pigs (eg chlorophyll, fluorescence) | Description: Cont. track of 250 n.m. |
| Particulate organic matter (inc POC, PON) | Quantity: number of stations = 50 |
| Dissolved organic matter (inc DOC) | Quantity: number of stations = 30 |
| Phytoplankton | Quantity: number of stations = 30 |
| Zooplankton | Quantity: number of stations = 50 |
| Seston | Quantity: number of stations = 50 |
| Nekton | Quantity: number of stations = 50 |
| Eggs and larvae | Quantity: number of stations = 50 Description: survey:population structures,energy transfers,biomass determination etc. |
| Pelagic bacteria/micro-organisms | Quantity: number of stations = 20 |
| Meteorology | |
| Incident radiation | |
| Geology and geophysics | |
| Core - soft bottom | Quantity: number of cores = 100 Description: chemical analysis of sediments |
| Data held at BODC | |
| Discrete samples | |
| 201 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 Concentration of suspended particulate material 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 |
