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

Cruise inventory

RRS John Murray JM10/78 (C/6/78)

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS John Murray (74MJ)
Cruise identifierJM10/78 (C/6/78)
Cruise period1978-09-26 — 1978-10-10
Port of departureBarry, United Kingdom
Port of returnBarry, United Kingdom
Objectives1) To measure the nutreints, chlorophyll, microseston, particle concentration and siz distribution, POC, PON, temperature, salinity, and the phytoplankton and zooplankton populations

2) To measure the feeding rates and development times of Calanus Helgolandicus and Acartia clausi

3) To measure the rate of primary production and nitrate uptake by phytoplankton

4) To measure the uptake and release of nutrients by micro organisms

5) To measure the release of ammonia by zooplankton

6) To measure the nutrient concentrations and oxygen consumption of pore water, and the rate of exchange of nutrients between the sediment and water column
Chief scientistHoward H Bottrell (Institute of Marine Environmental Research, Plymouth)
Cruise reportRRS John Murray JM10/78 (C/6/78) cruise report john_murray10_78.pdf — access key 'C' (0.28 MB) 
Ocean/sea areas 
GeneralIrish Sea and St. George's Channel
Bristol Channel
Track chartsRRS John Murray JM10/78 (C/6/78) cruise track — trk2118.html
Physical oceanography 
Surface measurements underway (T,S)
Subsurface temperature and salinity measurements
Chemical oceanography 
PhosphateDescription: continuous
NitrateDescription: continuous
NitriteDescription: continuous
SilicateDescription: continuous
Biology and fisheries 
Primary productivity
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of stations = 144
Particulate organic matter (inc POC, PON)Quantity: number of stations = 100
PhytoplanktonQuantity: number of stations = 100
ZooplanktonQuantity: number of stations = 127
Description: survey:distribution,biomass,energy transfers,population studies
SestonQuantity: number of stations = 144
Pelagic bacteria/micro-organismsQuantity: number of stations = 2
Benthic bacteria/micro-organismsQuantity: number of stations = 22
Data held at BODC 
Discrete samples 
162  General station with STD/bottles/additional instrumentsChlorophyll pigment concentrations in water bodies
Silicate concentration parameters in the water column
Salinity of 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