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BODC Cruise Metadata Report for RRS James Clark Ross (74JC) cruise JR20031128 (JR93)

Introduction

This report collates information from the BODC cruise inventory and oceanographic databases. It presents

Cruise Inventory Information

Long name RRS James Clark Ross (74JC) cruise JR20031128 (JR93)
Short name JR20031128 (JR93)
Objectives and Narrative The Southern Ocean is a major component of the coupled ocean-atmosphere climate system. It connects all the other major oceans and influences the water mass characteristics of the deep water over a large proportion of the world. It is an area of net heat loss from the ocean to the atmosphere, and is the conduit for substantial heat and freshwater exchange between the ocean basins. The objectives of the cruise were: to observe the location of the surface and subsurface manifestations of the Polar Front; to observe the deep temperature distribution; to measure the baroclinic and barotropic transport of the ACC at Drake Passage; to determine the interannual variability by comparison with previous datasets; to relate these measurements to continuous time series from moorings maintained by POL; to relate these measurements to surface SST and SSH data acquired by satellites.
High quality CTD and salinity sample measurements were made at 30 stations across Drake Passage from Elephant Island to Burdwood Bank at the same positions as occupied in previous cruises. Stations were full-depth, to within 10 metres of the seabed, with a maximum spacing of 35 km and at 50 metre bathymetry increments on the continental slopes. One other test station was carried out in Drake Passage, and the RaTS station was occupied in Marguerite Bay. The CTD package included a single downlooking WH300 Lowered ADCP. Underway measurements included single-point bathymetry, thermosalinograph, surface meteorology and shipboard ADCP down to 320 metres.
Opportunistic bathymetric mapping work and rock sample collection were also undertaken on this cruise leg lead by R Livermore, BAS (JR93). The hypothesis for JR93 was that the fragments of rock in Drake Passage may not be continental in origin and that they may not have existed during the early opening of the passage. The task during JR93 was to sample the biggest fragment, to determine its nature and age. This was achieved by:
1) bathymetric mapping, to examine the processes of crustal formation and search for sampling sites,
2) dredging any sediment-free areas of basement rock for samples.

There are two Cruise Summary Reports for JR93 (4598) and JR94 (4597).
Ship RRS James Clark Ross
Departure Port Stanley, Falkland Islands (Malvinas)
Departure Date 2003-11-28
Arrival Port Rothera, Antarctica
Arrival Date 2003-12-06
Principal Scientist(s) Brian A King (Southampton Oceanography Centre)
Responsible Organisation Southampton Oceanography Centre
Associated Project(s) CLIVAR, Drake Passage repeats
IHB Sea Areas Visited South Atlantic Ocean
Marsden Squares Visited 485/486/521/522
Work Area Description Southern Ocean
Work Area Bounding Polygon 70S,70W; 50S,70W; 50S,50W; 70S,50W; 70S,70W
Southern Limit 70S
Northern Limit 50S
Western Limit 70W
Eastern Limit 50W

Cruise Inventory Datasets

Physical oceanography  
Bathythermograph Quantity: number of profiles = 4
Description: XBTs  
CTD stations Quantity: number of stations = 32
Description: SBE CTD - temperature and salinity  
Current profiler (eg ADCP) Quantity: activity duration in days = 19
Description: Shipboard ADCP  
Current profiler (eg ADCP) Quantity: number of stations = 32
Description: Lowered ADCP - RDI Workhorse 300 KHz  
Surface measurements underway (T,S) Quantity: activity duration in days = 19
Description: Thermosalinographs  
Water bottle stations Quantity: number of stations = 32
Description: 10 bottles per station for sample salinity  
Meteorology  
Incident radiation Quantity: activity duration in days = 19
Description: Surface met  
Routine standard measurements Quantity: activity duration in days = 19
Description: Surface met  
Geology and geophysics  
Dredge Quantity: number of deployments = 6
Description: dredger  
Magnetic measurements Quantity: activity duration in days = 7
Description: towed magnetometer operated while ship underway  
Multi-beam echosounding Quantity: activity duration in days = 7
Description: swath bathymetry survey  
Single-beam echosounding Quantity: activity duration in days = 19
Description: Bathymetry - echo-sounder  

Cruise Inventory Mooring/Buoy Operations

No information on datasets is currently available

Summary of BODC Data Holdings for the Cruise

National Oceanographic Database

Summary

# Series Instrument Description Parameters
2 CTD/STD cast Density of the water column
Electrical conductivity of the water column
Salinity of the water column
Temperature of the water column
Vertical spatial coordinates

Note: Parameter terms are taken from the BODC Parameter Discovery Vocabulary XML (SKOS)

Full List

BODC Reference Instrument Description Date/Time Location  
739764 CTD/STD cast 2003-12-01 12:47Z to 2003-12-01 13:50Z 59° 1' S, 61° 10' W Click for more
739776 CTD/STD cast 2003-12-06 17:46Z to 2003-12-06 17:54Z 67° 35' S, 68° 9' W Click for more

Project Database

No data currently held for this cruise in the BODC Project Database

References

Track Charts

Track Chart

Reports

Cruise Report