RRS Discovery D125
Cruise summary report
|Ship name (ship code)||RRS Discovery (74E3)|
|Cruise period||1982-01-30 — 1982-02-25|
|Port of departure||Barry, United Kingdom|
|Port of return||Gibraltar, Gibraltar|
|Objectives||1. To sample the sediments above and below the carbonate compensation depth, mainly in the area Cape Verde distal abyssal plain/Mid Atlantic Ridge foothills, by means of a 2m Kastenlot corer and the IOS box corer.
2. To obtain pore water samples complementary to the sediments in (1) above by means of the IOS Mark II in situ pore water sampler and by squeezing sediment from box core subsamples.
3. To make detailed hydrographic casts of the upper ocean water column, and casts of the complete water column, for trace metal analysis. The metals of particular interest were manganese, iron and cadmium, the rare earth elements and aluminium.
4. To make tests of the new IOS in situ filtration device and to quantify and sample the particulate material of the water column with this device.
In addition, two secondary objectives, accepted on a 'ship of opportunity' basis, were:
5. To make a collection of surface seawater for the Standard Seawater Service, and,
6. To obtain expandable bathythermograph (XBT) records of the ocean mixed layer passage between the UK and the Azores.
|Chief scientist||John Thomson (Institute of Oceanographic Sciences Wormley Laboratory)|
|Cruise report||(0.63 MB)|
|General||North East Atlantic Ocean (limit 40W)|
|Bathythermograph||Quantity: number of profiles = 20|
|CTD stations||Quantity: number of stations = 21|
|Other physical oceanographic measurements||Quantity: number of stations = 4|
Description: in situ particle sampling(filtration)
|Oxygen||Quantity: number of stations = 6|
|Phosphate||Quantity: number of stations = 6|
|Silicate||Quantity: number of stations = 6|
|Trace elements||Quantity: number of stations = 6|
|Other chemical oceanographic measurements||Quantity: number of stations = 6|
|Geology and geophysics|
|Core - soft bottom||Quantity: number of cores = 2|
Description: chemical analysis;1 geochronology
|Multi-beam echosounding||Quantity: track kilometres = 7111.68|