RRS John Murray JM12/81 (B/5/81 C/4/81)

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS John Murray (74MJ)
Cruise identifierJM12/81 (B/5/81 C/4/81)
Cruise period1981-09-02 — 1981-09-09
Port of departureBarry, United Kingdom
Port of returnBarry, United Kingdom
Objectives1) To monitor the performance of the Bristol Channel to update the validation of ecosystem model GEMBASE

2) To study the relationship between light, chlorophyll, primary production and fluorescence on a C.P.R route

3) To carry out deep diving trials on the Undulating Oceanographic Recorder

4) To carry out incubation experiments to determine the uptake of ammonia by phytoplankton and bacteria
Chief scientistMichael B Jordan (Institute of Marine Environmental Research, Plymouth)
Cruise reportRRS John Murray JM12/81 (B/5/81 C/4/81) cruise report john_murray12_81.pdf (0.08 MB) 
Ocean/sea areas 
GeneralEnglish Channel
Irish Sea and St. George's Channel
Bay of Biscay
Track chartsRRS John Murray JM12/81 (B/5/81 C/4/81) cruise track — trk2612.html
Physical oceanography 
Surface measurements underway (T,S)
Transparency (eg transmissometer)
Other physical oceanographic measurementsQuantity: number of stations = 72
Chemical oceanography 
Suspended matter
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)Description: monitoring