Cruise inventory

RRS John Murray JM5/77 (B/4/77)

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS John Murray (74MJ)
Cruise identifierJM5/77 (B/4/77)
Cruise period1977-05-03 — 1977-05-15
StatusCompleted
Port of departureBarry, United Kingdom
Port of returnBarry, United Kingdom
PurposeResearch
ObjectivesBristol Channel survey with the following objectives:

1) To measure the spacial 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.
Chief scientistIan Joint (Institute of Marine Environmental Research, Plymouth)
Cruise reportRRS John Murray JM5/77 (B/4/77) cruise report john_murray5_77.pdf — access key 'C' (0.19 MB) 
Ocean/sea areas 
GeneralBristol Channel
Track chartsRRS John Murray JM5/77 (B/4/77) cruise track — trk1792.html
Measurements 
Physical oceanography 
Surface measurements underway (T,S)Quantity: number of stations = 26
Chemical oceanography 
PhosphateQuantity: activity duration in days = 2
Description: every 15 minutes
NitrateQuantity: activity duration in days = 2
Description: every 15 minutes
NitriteQuantity: activity duration in days = 2
Description: every 15 minutes
SilicateQuantity: activity duration in days = 2
Description: every 15 minutes
Contamination 
Suspended matterQuantity: number of stations = 26
Other contaminant measurementsQuantity: number of deployments = 1
Description: DRCM for 5 days
Biology and fisheries 
Primary productivityQuantity: number of experiments = 7
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of stations = 26
Dissolved organic matter (inc DOC)Quantity: number of stations = 26
ZooplanktonQuantity: number of stations = 26
Description: distribution,energy transfers
Pelagic bacteria/micro-organismsQuantity: number of stations = 3
Data held at BODC 
Discrete samples 
586  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
28  Lowestoft SamplerFish abundance in water bodies
Zooplankton taxonomy-related abundance per unit volume of the water column
Zooplankton non taxonomy-related abundance per unit volume of the water column