Cruise inventory

RRS John Murray JM3/80 (B/4/80)

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS John Murray (74MJ)
Cruise identifierJM3/80 (B/4/80)
Cruise period1980-05-19 — 1980-05-29
StatusCompleted
Port of departureBarry, United Kingdom
Port of returnBarry, United Kingdom
PurposeResearch
Objectives1) To continue the series of 5 'MULEX' cruises designed to quantify nutrient cycling processes in Carmarthen Bay, including;
A) Nutrient excretion rates of the zooplankton assemblage.
B) Nutrient demand rates by the phytoplankton assemblage
C) Nutrient regeneration rates byt the Benthos
D) Nitrification/dentrification process by bacteria
E) Nutrient advection and diffusion from surrounding regions to Carmarthen Bay

2) To continue the monitoring of the Bristol Channel and Severn Estuary.
Chief scientistPeter H Burkill (Institute of Marine Environmental Research, Plymouth)
Cruise reportRRS John Murray JM3/80 (B/4/80) cruise report john_murray3_80.pdf — access key 'C' (0.22 MB) 
Ocean/sea areas 
GeneralBristol Channel
Track chartsRRS John Murray JM3/80 (B/4/80) cruise track — trk2440a.html RRS John Murray JM3/80 (B/4/80) cruise track — trk2440b.html RRS John Murray JM3/80 (B/4/80) cruise track — trk2440c.html RRS John Murray JM3/80 (B/4/80) cruise track — trk2440d.html
Measurements 
Physical oceanography 
Surface measurements underway (T,S)Description: Cont. over 10 day period of cruise.
Transparency (eg transmissometer)Description: Cont. over 10 day period of cruise.
Chemical oceanography 
PhosphateDescription: Cont. over 10 day period of cruise.
Total - PDescription: Cont. over 10 day period of cruise.
NitrateDescription: Cont. over 10 day period of cruise.
NitriteDescription: Cont. over 10 day period of cruise.
SilicateDescription: Cont. over 10 day period of cruise.
Contamination 
Suspended matterDescription: Cont. over 10 day period of cruise.
Biology and fisheries 
Primary productivityQuantity: number of stations = 6
Phytoplankton pigs (eg chlorophyll, fluorescence)Description: Cont. track of 250 n.m.
Particulate organic matter (inc POC, PON)Quantity: number of stations = 50
Dissolved organic matter (inc DOC)Quantity: number of stations = 30
PhytoplanktonQuantity: number of stations = 30
ZooplanktonQuantity: number of stations = 50
SestonQuantity: number of stations = 50
NektonQuantity: number of stations = 50
Eggs and larvaeQuantity: number of stations = 50
Description: survey:population structures,energy transfers,biomass determination etc.
Pelagic bacteria/micro-organismsQuantity: number of stations = 20
Meteorology 
Incident radiation
Geology and geophysics 
Core - soft bottomQuantity: number of cores = 100
Description: chemical analysis of sediments
Data held at BODC 
Discrete samples 
201  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
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