RRS John Murray JM8/80 (B/6/80)
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | RRS John Murray (74MJ) |
| Cruise identifier | JM8/80 (B/6/80) |
| Cruise period | 1980-08-11 — 1980-08-20 |
| 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) Nurtient 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 |  (0.18 MB) |
| Ocean/sea areas | |
| General | Bristol Channel |
| Track charts |  |
| Measurements | |
| Physical oceanography | |
| Surface measurements underway (T,S) | Description: Cont. recording 300 n.m. approx. |
| Water bottle stations | Quantity: number of stations = 40 Description: S surface only |
| Transparency (eg transmissometer) | Quantity: number of stations = 30 |
| Chemical oceanography | |
| Phosphate | Description: Cont. recording 300 n.m. approx. |
| Total - P | Quantity: number of stations = 30 |
| Nitrate | Description: Cont. recording 300 n.m. approx. |
| Nitrite | Description: Cont. recording 300 n.m. approx. |
| Ammonia | Description: Cont. recording 300 n.m. approx. |
| Silicate | Description: Cont. recording 300 n.m. approx. |
| Contamination | |
| Suspended matter | Description: Cont. recording 300 n.m. approx. |
| Biology and fisheries | |
| Primary productivity | Quantity: number of stations = 8 |
| Phytoplankton pigs (eg chlorophyll, fluorescence) | Quantity: number of samples = 150 |
| Particulate organic matter (inc POC, PON) | Quantity: number of stations = 30 |
| Dissolved organic matter (inc DOC) | Quantity: number of stations = 40 |
| Dissolved organic matter (inc DOC) | Quantity: number of stations = 30 Description: Cont. recording 300 n.m. approx. |
| Phytoplankton | Quantity: number of stations = 30 |
| Zooplankton | Quantity: number of stations = 40 Description: survey:energy transfers,biomass determination,distribution |
| Seston | Quantity: number of stations = 30 |
| Pelagic bacteria/micro-organisms | Quantity: number of stations = 10 |
| Benthic bacteria/micro-organisms | Quantity: number of stations = 10 |
| Geology and geophysics | |
| Dredge | Quantity: number of deployments = 1 |
| Grab | Quantity: number of samples = 1 |
| Core - soft bottom | Quantity: number of cores = 25 Description: chemical analysis of sediments |
