Cruise inventory

RRS John Murray JM7/78 (C/4/78)

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS John Murray (74MJ)
Cruise identifierJM7/78 (C/4/78)
Cruise period1978-06-23 — 1978-07-05
Port of departureBarry, United Kingdom
Port of returnBarry, United Kingdom
Objectives1. To measure processes involved in the turnover of nitrogenous nutrients in a stratified water column (Celtic Sea) and a mixed water column (Carmarthen Bay).
2. To measure the feeding rates and development times of two species of copepod.
Chief scientistIan Joint (Institute of Marine Environmental Research, Plymouth)
Cruise reportRRS John Murray JM7/78 (C/4/78) cruise report john_murray7_78.pdf — access key 'C' (0.12 MB) 
Ocean/sea areas 
GeneralIrish Sea and St. George's Channel
Bristol Channel
Track chartsRRS John Murray JM7/78 (C/4/78) cruise track — trk2057a.html RRS John Murray JM7/78 (C/4/78) cruise track — trk2057b.html
Physical oceanography 
Surface measurements underway (T,S)Description: continuous recording, 240nm approx.
Transparency (eg transmissometer)Description: continuous recording, 240nm approx.
Chemical oceanography 
PhosphateDescription: continuous recording, 240nm approx.
NitrateDescription: continuous recording, 240nm approx.
NitriteDescription: continuous recording, 240nm approx.
SilicateDescription: continuous recording, 240nm approx.
Suspended matterDescription: continuous recording, 240nm approx.
Biology and fisheries 
Primary productivityQuantity: number of stations = 3
Phytoplankton pigs (eg chlorophyll, fluorescence)Description: continuous recording, 240nm approx.
Particulate organic matter (inc POC, PON)Quantity: number of stations = 147
Dissolved organic matter (inc DOC)Description: continuous recording, 240nm approx.
PhytoplanktonQuantity: number of stations = 50
ZooplanktonQuantity: number of stations = 36
Description: energy transfers,biomass,distribution etc. studies
SestonQuantity: number of stations = 147
Pelagic bacteria/micro-organismsQuantity: number of stations = 10
Other biological/fisheries measurementQuantity: number of stations = 147
Description: particle coulter counts
Data held at BODC 
Discrete samples 
271  General station with STD/bottles/additional instrumentsChlorophyll pigment concentrations in water bodies
Silicate concentration parameters in the water column
Salinity of the water column
Dissolved organic carbon concentration in the water column
Temperature of the water column
Nitrate concentration parameters in the water column
Phosphate concentration parameters in the water column
Phaeopigment concentrations in the water column
Nitrite concentration parameters in the water column