Cruise inventory

RRS John Murray JM1/78

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS John Murray (74MJ)
Cruise identifierJM1/78
Cruise period1978-01-11 — 1978-01-25
StatusCompleted
Port of departureBarry, United Kingdom
Port of returnBarry, United Kingdom
PurposeResearch
Objectives1) To measure the spatial variability of dissolved organic and inorganic nutrients, phytoplankton and zooplankton.

2) To measure the fluxes of organic and inorganic nutrients between phytoplankton, heterotrophic microbes and omnivorous zooplankton and to measure the rates of primary and secondary production.

3) To make current meter measurements at 2 stations as a reconnaissance for long-term deployment of current meters. The methods used were those outlined in the cruise programme
Chief scientistAlan W Morris (Institute of Marine Environmental Research, Plymouth)
Cruise reportRRS John Murray JM1/78 cruise report john_murray1_78.pdf — access key 'C' (0.13 MB) 
Ocean/sea areas 
GeneralBristol Channel
Track chartsRRS John Murray JM1/78 cruise track — trk1832.html
Measurements 
Physical oceanography 
Surface measurements underway (T,S)Description: continuous surface record, 400nm approx.
Current metersQuantity: number of deployments = 1
Description: 1 week
Chemical oceanography 
PhosphateDescription: continuous surface record, 400nm approx.
NitrateDescription: continuous surface record, 400nm approx.
NitriteDescription: continuous surface record, 400nm approx.
AmmoniaDescription: continuous surface record, 400nm approx.
SilicateDescription: continuous surface record, 400nm approx.
Contamination 
Suspended matterDescription: continuous surface record, 400nm approx.
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)Description: continuous surface record, 400nm approx.
Dissolved organic matter (inc DOC)Description: continuous surface record, 400nm approx.
ZooplanktonDescription: survey:population,energy transfers,biomass etc studies
Benthic bacteria/micro-organismsQuantity: number of samples = 50
Data held at BODC 
Discrete samples 
624  General station with STD/bottles/additional instrumentsChlorophyll pigment concentrations in water bodies
Silicate concentration parameters in the water column
Salinity of the water column
Horizontal velocity of the water column (currents)
Dissolved organic carbon concentration in the water column
Nitrate concentration parameters in the water column
Temperature of the water column
Phaeopigment concentrations in the water column
Nitrite concentration parameters in the water column
Phosphate concentration parameters in the water column
23  Lowestoft SamplerFish abundance in water bodies
Zooplankton taxonomy-related abundance per unit volume of the water column