RRS James Clark Ross JR20000327 (JR48b)
Cruise summary report
|Ship name (ship code)||RRS James Clark Ross (74JC)|
|Cruise identifier||JR20000327 (JR48b)|
|Cruise period||2000-03-27 — 2000-04-01|
|Port of departure||Stanley, Falkland Islands (Malvinas)|
|Port of return||Stanley, Falkland Islands (Malvinas)|
|Objectives||Cruise JR48 contributed to two BAS projects within the SAGES programme
(Significance in Antarctica of Global changES) and also the High Latitude Palaeoenvironments Project (HILATS). There were two legs associated with this cruise (see also JR48a). In order of importance, the cruise objectives were:
i) Survey (bathymetry/3.5 kHz, sparker/sidescan) and vibrocoring on the continental shelf
SW of James Ross Island, in the areas formerly occupied by the northern Larsen and Prince
Gustav Ice Shelves.
Ii) 3.5 kHz survey and piston coring in the northern Weddell Sea, Scotia Sea and Falkland
Trough, to investigate late Quaternary palaoceanography, particularly flow history of the
Weddell Gyre and Antarctic Circumpolar Current.
Iii) Sparker survey and rock drilling/vibrocoring on the continental shelf near Anvers I and
near Seymour I: pilot study for a future Cenozoic project.
Underway measurements were to include bathymetric, 3.5 kHz and magnetic survey, and
water sampling using the pumped non-toxic seawater supply. A short dredging cruise was to be undertaken for Dr P F Barker, after the main coring cruise.
The coring cruise occupied 27.6 days (Feb 26th to March 25th, Stanley to Stanley), plus
4 days of mobilisation and 1.5 days demobilisation. The weather was generally good and only 2 days were lost to bad weather, fog and ice. All the objectives were achieved except the work near Seymour Island, which was not attempted
because of shortage of time. Cores totalling 257 metres were obtained from 63 sites. Of these, 41 cores (plus 1340 km of track) were obtained from unsurveyed areas formerly covered by ice shelves. A transect of piston cores was obtained from the northern Weddell Sea (Powell Basin and Jane Basin) to the Falkland Trough; this work included detailed survey of two areas of sediment waves. Cenozoic outcrops were located and sampled on the shelf near Anvers Island.
|Chief scientist||Carol J Pudsey (British Antarctic Survey)|
|Cruise report||(8.37 MB)|
|General||South Atlantic Ocean|
|Specific||N. Scotia Ridge|
|Track charts||(1.16 MB)|
|Geology and geophysics|
|Dredge||Quantity: number of stations = 5|
Description: A number of stations were dredged throughout the cruise. 4 large hauls of sedimentary rocks and one a small amount of igneous rock.