Cruise inventory

RRS John Murray JM8/80 (B/6/80)

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS John Murray (74MJ)
Cruise identifierJM8/80 (B/6/80)
Cruise period1980-08-11 — 1980-08-20
StatusCompleted
Port of departureBarry, United Kingdom
Port of returnBarry, United Kingdom
PurposeResearch
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) 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 scientistR Fauzi C Mantoura (Institute of Marine Environmental Research, Plymouth)
Cruise reportRRS John Murray JM8/80 (B/6/80) cruise report john_murray8_80.pdf — access key 'C' (0.18 MB) 
Ocean/sea areas 
GeneralBristol Channel
Track chartsRRS John Murray JM8/80 (B/6/80) cruise track — trk2458a.html RRS John Murray JM8/80 (B/6/80) cruise track — trk2458b.html
Measurements 
Physical oceanography 
Surface measurements underway (T,S)Description: Cont. recording 300 n.m. approx.
Water bottle stationsQuantity: number of stations = 40
Description: S surface only
Transparency (eg transmissometer)Quantity: number of stations = 30
Chemical oceanography 
PhosphateDescription: Cont. recording 300 n.m. approx.
Total - PQuantity: number of stations = 30
NitrateDescription: Cont. recording 300 n.m. approx.
NitriteDescription: Cont. recording 300 n.m. approx.
AmmoniaDescription: Cont. recording 300 n.m. approx.
SilicateDescription: Cont. recording 300 n.m. approx.
Contamination 
Suspended matterDescription: Cont. recording 300 n.m. approx.
Biology and fisheries 
Primary productivityQuantity: 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 = 30
Description: Cont. recording 300 n.m. approx.
Dissolved organic matter (inc DOC)Quantity: number of stations = 40
PhytoplanktonQuantity: number of stations = 30
ZooplanktonQuantity: number of stations = 40
Description: survey:energy transfers,biomass determination,distribution
SestonQuantity: number of stations = 30
Pelagic bacteria/micro-organismsQuantity: number of stations = 10
Benthic bacteria/micro-organismsQuantity: number of stations = 10
Geology and geophysics 
DredgeQuantity: number of deployments = 1
GrabQuantity: number of samples = 1
Core - soft bottomQuantity: number of cores = 25
Description: chemical analysis of sediments