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RRS John Murray JM11/75
Cruise summary report
|Ship name (ship code)||RRS John Murray (74MJ)|
|Cruise period||1975-08-15 — 1975-08-21|
|Port of departure||Liverpool, United Kingdom|
|Port of return||Barry, United Kingdom|
|Objectives||1) To study the frontal region, situated in the southern St George's Channel, by continously sampling surface conductivity and temperature, by taking vertical profiles of conductivity and temperature and by developing Batfish to measure conductivity and temperature against depth while the vessel was moving.
2) To study internal tides in the Celtic Sea, especially in the area where the depth of thermocline decreased. This entailed deploying recording current meter and thermistor chain rigs.
3) To continue a study of the circulation, long term variability and physical oceanography of the area by comparing the results from the above equiptment with those from previous experiments.
4) To provide data for a cotidal chart and energy budget of the area by deploying 2 current meter rigs, one off St Ives and one near Lundy, to fill in the gaps of previous experiments.
5) To test hardware developments to recording current meters- an elapsed time counter and a new bottom frame- and the effects of sampling the data frequently.
|Chief scientist||M John Howarth (Institute of Oceanographic Sciences Bidston Laboratory)|
|Cruise report||(0.66 MB)|
|General||Irish Sea and St. George's Channel|
|Track charts||(0.04 MB)|
|Surface measurements underway (T,S)||Quantity: track kilometres = 1530|
|CTD stations||Quantity: number of stations = 96|
Description: CTD profiles.
|Current meters||Quantity: number of deployments = 7|
Description: 55 days
|Moorings, landers, buoys|
|Current meters||51° 39' 59" N 6° 4' 59" W — Current meter deployed at station 'A'|
|Current meters||51° 18' 59" N 4° 43' 59" W — Current meter deployed at station 'D'|
|Current meters||50° 27' 0" N 5° 54' 0" W — Current meter deployed at station 'E'|
|Current meters||51° 56' 29" N 6° 46' 59" W — Current meter deployed at station 'C'|
|Current meters||52° 4' 59" N 5° 45' 59" W — Current meter deployed at station 'J'|
|Current meters||51° 27' 59" N 6° 34' 59" W — Current meter deployed at station 'B'|
|Current meters||51° 54' 59" N 5° 57' 59" W — Current meter deployed at station 'H'|