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BODC Cruise Metadata Report for RRS James Clark Ross (74JC) cruise JR20061206 (JR155, JR163, JR164)

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 JR20061206 (JR155, JR163, JR164)
Short name JR20061206 (JR155, JR163, JR164)
Objectives and Narrative Twelfth occupation of the Drake Passage section, established during the World Ocean Circulation Experiment as repeat section SR1b, first occupied by Southampton Oceanography Centre (now the National Oceanography Centre) in collaboration with the British Antarctic Survey in 1993, and re-occupied most years since then.
The main objectives are:
(i) to determine the interannual variability of the position, structure and transport of the Antarctic Circumpolar Current (ACC) in Drake Passage;
(ii) to examine the fronts associated with the ACC, and to determine their positions and strengths;
(iii) by comparing geostrophic velocities with those measured directly (by the lowered ADCP), to determine the size of ageostrophic motions, and to attempt to estimate the barotropic components;
(iv) to examine the temperature and salinity structure of the water flowing through Drake Passage, and to identify thereby the significant water masses;
(v) to calculate the total flux of water through Drake Passage by combining all available measurements.
ACCLAIM Bottom Pressure Recorders have been used for making measurements of the Antarctic Circumpolar Current (ACC) since 1988, initially in the Scotia Sea and then later across the Drake Passage between the Falkland Islands and the Antarctic peninsula. Some of the Bottom Pressure Recorders (BPRs) are combined with Inverted Echo Sounders (IES). During this cruise, one BPR and one BPR/IES were recovered and re-deployed in the Drake Passage. The Sea Level Recorders at Stanley, Falkland Islands, Vernadsky and Rothera Research Stations in Antarctica, were also serviced.

JR155 was part of a continuing series as part of an AFI project (NERC NER/G/S/2002/00024 Biogeochemical Particle Flux Study in Marguerite Bay Antarctic Peninsula AFI4/13 PIs Jickells, Clarke, Brandon and Meredith) to study the physical and chemical properties, primary productivity processes and sedimentation processes in Marguerite Bay. The work is designed to augment the ongoing BAS Rothera Biogeochemical Times Series (RaTS) programme in Ryder Bay in northern Marguerite Bay, and to extend the programme into the open waters of Marguerite Bay. The sampling is therefore undertaken at two sites, the RaTS station in Ryder Bay and in the deeper water within Marguerite Bay itself. The cruise also contributed to another AFI project (NERC AFI4/02) PIs Elderfield, Ganeshram, Rickerby and de la Rocha "Behaviour of trace elements and isotope ratios of sea-ice brine and microaalgae: reconstructing the Antarctic sea-ice environment." In this second season (2006/7), moorings deployed earlier in the project were continued through a further full season and additional sediment sampling was undertaken. Hence the aims of JR155 were:
1. recover, service and redeploy the moorings previously deployed on JR136/7 in 2006,
2. conduct CTD casts to describe the physical structure of the water column and to provide water samples for nutrient and particulate matter analyses,
3. take box cores at both sites.

The locations were, as on previous cruises for this project, one 'deep' mooring 22 miles from Rothera research station with a ~840m water column depth and one 'shallow' mooring at the Ryder Bay site (RaTS) 2 miles from Rothera with a ~500 m water column depth.
Ship RRS James Clark Ross
Departure Port Stanley, Falkland Islands (Malvinas)
Departure Date 2006-12-06
Arrival Port Rothera, Antarctica
Arrival Date 2006-12-17
Principal Scientist(s) Adam P Williams (National Oceanography Centre, Southampton), Rachel Hadfield (National Oceanography Centre, Southampton), Tim Jickells (University of East Anglia School of Environmental Sciences)
Responsible Organisation National Oceanography Centre, Southampton
Associated Project(s) Drake Passage repeats
IHB Sea Areas Visited South West Atlantic Ocean (limit 20W), Southern Ocean
Marsden Squares Visited 485/521/522
Work Area Description Drake Passage. Marguerite Bay.
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  
CTD stations Quantity: number of samples = 368
Description: SBE35 High Precision Thermometer. 11 seconds of data recorded every time a water sample was collected  
CTD stations Quantity: number of stations = 2
Description: 2 CTD stations with water samples collected for nutrient analysis  
CTD stations Quantity: number of stations = 31
Description: Vertical profiles, continuous recording. Temperature, conductivity, pressure, oxygen, transmissivity, fluorescence.  
Current profiler (eg ADCP) Quantity: activity duration in days = 9
Description: Velocity profiles. Vessel-mounted Acoustic Doppler Current Profiler (VM-ADCP) 75 kHz RD Instruments Ocean Surveyor (OS75)  
Surface measurements underway (T,S) Quantity: activity duration in days = 9
Description: Oceanlogger: SBE45 Conductivity, temperature, depth. Turner Designs 10-AU Fluorometer. Continuous sampling. Intake ~ 6-m depth.  
Water bottle stations Quantity: number of samples = 368
Description: Water samples for salinometer salinity determinations at the 30 CTD stations  
Water bottle stations Quantity: number of stations = 2
Description: 2 CTD stations with water samples collected for nutrient analysis  
Chemical oceanography  
Other chemical oceanographic measurements Quantity: number of samples = 56
Description: Particulate Inorganic Matter  
Silicate Quantity: number of samples = 56
Description: Biogenic Silica  
Biology and fisheries  
Particulate organic matter (inc POC, PON) Quantity: number of samples = 53
Description: Particulate Organic Matter  
Phytoplankton pigs (eg chlorophyll, fluorescence) Quantity: number of samples = 131
Description: Chlorophyll  
Meteorology  
Routine standard measurements Quantity: activity duration in days = 9
Description: Standard meterological measurements by automated sensor package on JCR  
Geology and geophysics  
Core - soft bottom Quantity: number of stations = 2
Description: 2 box core stations  

Cruise Inventory Mooring/Buoy Operations

Latitude Longitude Data type Description
67° 56' S 68° 22' W Current meters Sediment traps and current meters recovered and deployed
54° 56' S 58° 21' W Sea level (inc. bot. press., inverted echosounder) Bottom pressure recorder deployed 2005, recovered Dec 2006. Drake North
60° 51' S 54° 42' W Sea level (inc. bot. press., inverted echosounder) bottom pressure recorder and inverted echo sounder. Deployed Dec 2005, recovered Dec 2006. Drake South.
54° 56' S 58° 21' W Sea level (inc. bot. press., inverted echosounder) bottom pressure recorder deployed Dec 2006. Drake North
60° 51' S 54° 42' W Sea level (inc. bot. press., inverted echosounder)
67° 56' S 68° 22' W Sediment traps Sediment traps and current meters recovered and deployed

Summary of BODC Data Holdings for the Cruise

National Oceanographic Database

Summary

# Series Instrument Description Parameters
1 Acoustic doppler current profiler Acoustic backscatter in the water column
Date and time
Horizontal velocity of the water column (currents)
Metadata parameters
Platform or instrument orientation
Reference numbers
Vertical spatial coordinates
3 Moored CTD Date and time
Density of the water column
Electrical conductivity of the water column
Moored instrument depth
Reference numbers
Salinity of the water column
Temperature of the water column
1 Water temperature and/or salinity monitor Date and time
Reference numbers
Temperature of the water column
1 Water temperature and/or salinity monitor Date and time
Reference numbers
Sea level
Temperature of the water column

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

Full List

BODC Reference Instrument Description Date/Time Location  
770668 Acoustic doppler current profiler 2006-12-17 13:57Z to 2007-04-13 10:57Z 67° 34' S, 68° 13' W Click for more
775974 Water temperature and/or salinity monitor 2006-12-17 19:00Z to 2007-04-09 08:00Z 67° 34' S, 68° 13' W Click for more
776166 Moored CTD 2006-12-17 19:00Z to 2007-04-09 08:00Z 67° 34' S, 68° 13' W Click for more
776209 Moored CTD 2006-12-17 19:00Z to 2007-04-09 08:00Z 67° 34' S, 68° 13' W Click for more
776234 Moored CTD 2006-12-17 19:00Z to 2007-04-09 08:00Z 67° 34' S, 68° 13' W Click for more
777317 Water temperature and/or salinity monitor 2006-12-17 19:00Z to 2007-04-09 08:00Z 67° 34' S, 68° 13' 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

Cruise Report

Cruise Report