Cruise inventory

RRS John Murray JM9/77 (B/7/77)

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS John Murray (74MJ)
Cruise identifierJM9/77 (B/7/77)
Cruise period1977-08-01 — 1977-08-13
StatusCompleted
Port of departureBarry, United Kingdom
Port of returnCardiff, United Kingdom
PurposeResearch
ObjectivesBristol Channel survey with the objectives:

1) 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.

4) To carry out preliminary trawling in Swansea and other bays.
Chief scientistAlan W Morris (Institute of Marine Environmental Research, Plymouth)
Cruise reportRRS John Murray JM9/77 (B/7/77) cruise report john_murray9_77.pdf — access key 'C' (0.15 MB) 
Ocean/sea areas 
GeneralBristol Channel
Track chartsRRS John Murray JM9/77 (B/7/77) cruise track — trk1810.html
Measurements 
Physical oceanography 
Surface measurements underway (T,S)Quantity: track kilometres = 740.8
Transparency (eg transmissometer)Quantity: track kilometres = 740.8
Chemical oceanography 
PhosphateQuantity: track kilometres = 740.8
Total - P
NitrateQuantity: track kilometres = 740.8
NitriteQuantity: track kilometres = 740.8
SilicateQuantity: track kilometres = 740.8
Contamination 
Suspended matterQuantity: track kilometres = 740.8
Biology and fisheries 
Primary productivityQuantity: number of stations = 21
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: track kilometres = 740.8
Dissolved organic matter (inc DOC)Quantity: track kilometres = 740.8
PhytoplanktonQuantity: number of stations = 21
Description: distribution,population
ZooplanktonQuantity: number of stations = 21
Description: distribution,population
Data held at BODC 
Discrete samples 
710  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
Phaeopigment concentrations in the water column
Nitrite concentration parameters in the water column
Phosphate concentration parameters in the water column
30  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