Cruise inventory

RRS John Murray JM7/81

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS John Murray (74MJ)
Cruise identifierJM7/81
Cruise period1981-06-13 — 1981-06-24
StatusCompleted
Port of departureImmingham, United Kingdom
Port of returnDundee, United Kingdom
Objectives1) To recover 24 moorings previously deployed during cruise 5/81.
2) To carry out a CTD and surface water sampling survey.
3) Redeploy one mooring adjacent to the Haisborough light vessel.
4) Evaluate the performance of a new surface marker buoy, a side scan sensor to aid rig recovery, and an overside sensor pack for surface water sampling.
Chief scientistAlan J Harrison (Institute of Oceanographic Sciences Bidston Laboratory)
Cruise reportRRS John Murray JM7/81 cruise report john_murray5and7_81.pdf — access key 'C' (1.22 MB) 
Ocean/sea areas 
GeneralNorth Sea
SpecificUK coastal waters
Track chartsRRS John Murray JM7/81 cruise track — trk2724c.html RRS John Murray JM7/81 cruise track — trk2724d.html RRS John Murray JM7/81 cruise track — trk2724e.html
Measurements 
Physical oceanography 
Surface measurements underway (T,S)Quantity: activity duration in days = 12
CTD stationsQuantity: number of stations = 100
Current metersDescription: 24 c.m.;12 days
Sea level (inc. bot. press., inverted echosounder)Quantity: activity duration in days = 12
Biology and fisheries 
Gear researchDescription: acoustic trials, sidescan sonar tests, new overside sensor pack tested.