RRS John Murray JM11/80 (B/7/80)

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS John Murray (74MJ)
Cruise identifierJM11/80 (B/7/80)
Cruise period1980-10-08 — 1980-10-16
Port of departureBarry, United Kingdom
Port of returnMilford Haven, United Kingdom
Objectives1) 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 scientistR Fauzi C Mantoura (Institute of Marine Environmental Research, Plymouth)
Cruise reportRRS John Murray JM11/80 (B/7/80) cruise report john_murray11_80.pdf (0.14 MB) 
Ocean/sea areas 
GeneralBristol Channel
Track chartsRRS John Murray JM11/80 (B/7/80) cruise track — trk2459.html
Physical oceanography 
Surface measurements underway (T,S)
Water bottle stationsQuantity: number of stations = 30
Description: S surface only
Transparency (eg transmissometer)Quantity: number of stations = 5
Current metersQuantity: number of deployments = 1
Description: 20 hours
Chemical oceanography 
Suspended matter
Biology and fisheries 
Primary productivityQuantity: 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
PhytoplanktonQuantity: number of stations = 30
ZooplanktonQuantity: number of stations = 16
Description: identification,distribution,energy transfers
SestonQuantity: number of stations = 30
Pelagic bacteria/micro-organismsQuantity: number of stations = 15
Geology and geophysics 
Core - soft bottomQuantity: number of cores = 30
Description: physical/chemical analysis