RRS John Murray JM11/80 (B/7/80)
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | RRS John Murray (74MJ) |
| Cruise identifier | JM11/80 (B/7/80) |
| Cruise period | 1980-10-08 — 1980-10-16 |
| Status | Completed |
| Port of departure | Barry, United Kingdom |
| Port of return | Milford Haven, 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 by the Benthos D) Nutrient upflux from sediments E) Nitrification/dentrification process by bacteria F) Nutrient advection and diffusion from surrounding regions to Carmarthen Bay 2) To continue the monitoring of the Bristol Channel and Severn Estuary. |
| Chief scientist | R Fauzi C Mantoura (Institute of Marine Environmental Research, Plymouth) |
| Cruise report |  (0.14 MB) |
| Ocean/sea areas | |
| General | Bristol Channel |
| Track charts |  |
| Measurements | |
| Physical oceanography | |
| Surface measurements underway (T,S) | |
| Water bottle stations | Quantity: number of stations = 30 Description: S surface only |
| Transparency (eg transmissometer) | Quantity: number of stations = 5 |
| Current meters | Quantity: number of deployments = 1 Description: 20 hours |
| Chemical oceanography | |
| Phosphate | |
| Nitrate | |
| Nitrite | |
| Ammonia | |
| Silicate | |
| Contamination | |
| Suspended matter | |
| Biology and fisheries | |
| Primary productivity | Quantity: number of stations = 4 |
| Phytoplankton pigs (eg chlorophyll, fluorescence) | Quantity: number of stations = 30 |
| Particulate organic matter (inc POC, PON) | Quantity: number of stations = 30 |
| Dissolved organic matter (inc DOC) | Quantity: number of stations = 30 |
| Phytoplankton | Quantity: number of stations = 30 |
| Zooplankton | Quantity: number of stations = 16 Description: identification,distribution,energy transfers |
| Seston | Quantity: number of stations = 30 |
| Pelagic bacteria/micro-organisms | Quantity: number of stations = 15 |
| Geology and geophysics | |
| Core - soft bottom | Quantity: number of cores = 30 Description: physical/chemical analysis |
