RRS Discovery D141
Cruise summary report
|Ship name (ship code)||RRS Discovery (74E3)|
|Cruise period||1983-10-26 — 1983-11-16|
|Port of departure||South Shields, United Kingdom|
|Port of return||Dakar, Senegal|
|Objectives||1. To recover 3 ALS and 2 Moored Sources, part of the Sofar Float Programme, which were deployed from Discovery Cruise 138, June 1983.
2. To recover 7 Current Meter Moorings on the Madeira Rise, which were deployed from Discovery Cruise 139, July 1983.
3. To deploy, test and recover a new Digital OBS, for which it will be necessary to tow an air-gun for a short run of a few hours.
4. To deploy, test and recover PUPPI, a new instrument designed to log pore pressures in ocean sediments.
5. To deploy and test a dummy penetrometer with its telemetering transponder in the Great Meteor East area.
6. To listen to the Francis Beacon at 47N 11W on passage out, if timing convenient.
7. To check and work up scientific equipment modified on-board during 1983 refit.
|Chief scientist||Brian S McCartney (Institute of Oceanographic Sciences Wormley Laboratory)|
|Cruise report||(0.77 MB)|
|General||North West Atlantic Ocean (limit 40W)|
|Specific||Great Meteor East/ Madeira Rise|
|Current meters||Quantity: number of recoveries = 18|
Description: No. of c.ms recovered;laid on Cr.139;100 days
|Other physical oceanographic measurements||Quantity: number of stations = 2|
Description: Autonomous listening station(moorings laid on Cr.138) acoustic stations
|Routine standard measurements|
|Geology and geophysics|
|In-situ seafloor measurement/sampling||Quantity: number of deployments = 1|
Description: pop-up pore pressure instrument
|Multi-beam echosounding||Quantity: track kilometres = 3704|
|Other geological/geophysical measurements||Quantity: number of deployments = 2|
Description: digital pop-up seismometers testing