RRS John Murray JM1/80 (B/2/80)

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS John Murray (74MJ)
Cruise identifierJM1/80 (B/2/80)
Cruise period1980-03-13 — 1980-03-24
Port of departurePlymouth, United Kingdom
Port of returnBarry, United Kingdom
ObjectivesBristol Channel survey with the following objectives:

1) Advective and diffusive transport of nutrients from local run off, Celtic Sea/ Bristol Channel water and underlying sedimentary pore- waters

2) Nutrient demand from primary producers using double isotope labelling techniques 15N and 14C

3) Nutrient excretion by the total zooplankton system in terms of four size fractioned subpopulations

4) Bacterial nitrification and dentrification processes

5) To continue a series of monitoring surveys of the Bristol Channel and Severn Estuary ecosystem.
Chief scientistR Fauzi C Mantoura (Institute of Marine Environmental Research, Plymouth)
Cruise reportRRS John Murray JM1/80 (B/2/80) cruise report john_murray1_80.pdf (0.14 MB) 
Ocean/sea areas 
GeneralBristol Channel
Track chartsRRS John Murray JM1/80 (B/2/80) cruise track — trk2434a.html RRS John Murray JM1/80 (B/2/80) cruise track — trk2434b.html
Physical oceanography 
Surface measurements underway (T,S)Description: Continuous recording 260 n.m. approx.
Chemical oceanography 
AmmoniaQuantity: number of stations = 30
Suspended matterDescription: Continuous recording 260 n.m. approx.
Biology and fisheries 
Primary productivityQuantity: number of stations = 4
Phytoplankton pigs (eg chlorophyll, fluorescence)
Particulate organic matter (inc POC, PON)Quantity: number of stations = 60
Dissolved organic matter (inc DOC)Quantity: number of stations = 30
Biochemical measurements (eg lipids, amino acids)Quantity: number of stations = 30
PhytoplanktonQuantity: number of stations = 15
ZooplanktonQuantity: number of stations = 15
Pelagic bacteria/micro-organismsQuantity: number of stations = 15
ZoobenthosQuantity: number of stations = 1
Description: survey:energy transfers,distribution,physiology
Geology and geophysics 
Core - soft bottomQuantity: number of cores = 20
Description: chemical analysis of sediments
Data held at BODC 
Discrete samples 
173  General station with STD/bottles/additional instrumentsChlorophyll pigment concentrations in water bodies
Silicate concentration parameters in the water column
Salinity of the water column
Concentration of suspended particulate material 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