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RRS James Clark Ross JR20020212 (JR71)
Cruise summary report
Cruise Info. | |
Ship name (ship code) | RRS James Clark Ross (74JC) |
Cruise identifier | JR20020212 (JR71) |
Cruise period | 2002-02-12 — 2002-03-19 |
Status | Completed |
Port of departure | Stanley, Falkland Islands (Malvinas) |
Port of return | Stanley, Falkland Islands (Malvinas) |
Purpose | Research |
Objectives | Cruise JR71 had four main objectives:
1) Survey and coring on the continental shelf and slope east of the northern Antarctic Peninsula, within and offshore from the areas formerly covered by the ice shelves in Prince Gustav Channel, Larsen-A and Larsen-B (SAGES core programme, led by Dr C J Pudsey) 2) Survey and coring on the continental shelf and slope offshore Marguerite Bay (AFI project 48/02, led by Prof J A Dowdeswell) 3) Surface water sampling for diatom assemblages (AFI-CGI project 99/02, led by Dr J Pike) 4) A CTD transect across the northern limb of the Weddell Gyre, to measure the outflow of Weddell Sea Bottom Water (opportunistic project led by Dr K Nicholls). Underway measurements included swath bathymetric, TOPAS and magnetic survey, plus the routine collection of ocean-logger and acoustic doppler current profiler data. The cruise occupied 34.5 days (Feb 12th to March 19th, Stanley to Stanley) plus three days of mobilisation and one day of demobilisation. The weather was generally very good and no time was spent hove-to, though it was often necessary to slow down because of ice conditions combined with poor visibility. A small amount of time was lost on account of equipment failure (the BGS vibrocorer and the ship's Seametrix system). 21 hours were spent on passage to/from Rothera and alongside transferring passengers and cargo. |
Chief scientist | Carol J Pudsey (British Antarctic Survey) |
Project | Signals in Antarctica of Global Changes (SAGES) |
Coordinating body | BAS |
Cruise report | (10.21 MB) |
Ocean/sea areas | |
General | South Atlantic Ocean South Pacific Ocean |
Specific | Marguerite Bay &Larsen Ice Shelf |
Track charts | (14.03 MB) |
Measurements | |
Physical oceanography | |
Bathythermograph | Description: XBT's were deployed throughout the cruise. No. of deployments not noted. |
Geology and geophysics | |
Core - soft bottom | Description: The magnetometer was deployed and numerous cores were also taken. No. of deployments not noted. |
Core - soft bottom | Description: In Prince Gustav Channel box core samples were taken in vibrocore sites, in order to get a sample without disurbed sediment. No. of samples not noted. |
Single channel seismic reflection | Quantity: number of deployments = 1 Description: Just south of the Shackleton Fracture Zone the TOPAS sub-bottom profiler was deployed. |
Magnetic measurements | Description: The magnetometer was deployed and numerous cores were also taken. No. of deployments not noted. |