Planned maintenance — 18th January 2018 12:00 to 22nd January 2018 09:00 [more]

Cruise inventory

RRS John Murray JM13/77 (B/9/77)

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS John Murray (74MJ)
Cruise identifierJM13/77 (B/9/77)
Cruise period1977-10-25 — 1977-11-06
Port of departureBarry, United Kingdom
Port of returnBarry, United Kingdom
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
Chief scientistIan Joint (Institute of Marine Environmental Research, Plymouth)
Cruise reportRRS John Murray JM13/77 (B/9/77) cruise report john_murray13_77.pdf — access key 'C' (0.10 MB) 
Ocean/sea areas 
GeneralBristol Channel
Track chartsRRS John Murray JM13/77 (B/9/77) cruise track — trk1822.html
Physical oceanography 
Surface measurements underway (T,S)Quantity: track kilometres = 592.64
Transparency (eg transmissometer)Quantity: track kilometres = 592.64
Current metersQuantity: number of deployments = 1
Description: 1 month
Chemical oceanography 
PhosphateQuantity: track kilometres = 592.64
NitrateQuantity: track kilometres = 592.64
NitriteQuantity: track kilometres = 592.64
SilicateQuantity: track kilometres = 592.64
Suspended matterQuantity: track kilometres = 592.64
Biology and fisheries 
Primary productivityQuantity: number of stations = 3
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: track kilometres = 592.64
Dissolved organic matter (inc DOC)Quantity: track kilometres = 592.64
ZooplanktonQuantity: number of stations = 15
Description: distribution,identification
Pelagic bacteria/micro-organismsQuantity: number of stations = 12
Data held at BODC 
Discrete samples 
546  General station with STD/bottles/additional instrumentsChlorophyll pigment concentrations in water bodies
Silicate concentration parameters in the water column
Dissolved organic carbon concentration in the water column
Salinity of the water column
Concentration of suspended particulate material in the water column
Horizontal velocity of the water column (currents)
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
20  Lowestoft SamplerZooplankton taxonomy-related abundance per unit volume of the water column
Fish abundance in water bodies
Zooplankton non taxonomy-related abundance per unit volume of the water column