BROKE West Survey, Marine Science Cruise AU0603 - Oceanographic Field Measurements and Analysis
Entry ID: BROKE-West_CTD_au0603

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Summary
Abstract: Oceanographic measurements around the 'BROKE-West' survey area along the Antarctic continental margin between 30 degrees and 80 degrees south were conducted aboard Aurora Australis cruise au0603 (voyage 3 2005/2006, 2nd January to 12th March 2006). A total of 120 CTD vertical profile stations were taken, most to within 15 m of the bottom. Over 2500 Niskin bottle water samples were collected for the measurement of salinity, dissolved oxygen, nutrients (phosphate, nitrate+nitrite, silicate and ammonia), 18O, dissolved inorganic carbon, alkalinity, particulate organic carbon/nitrogen/silicate, dimethyl sulphide, and biological parameters, using a 24 bottle rosette sampler. Full depth current profiles were collected by an LADCP attached to the CTD package, while near surface current profile data were collected by a ship mounted ADCP. Data from the array of ship's underway sensors are included in the data set.

This report describes the processing/calibration of the CTD and ADCP data, and details the data quality. An offset correction is derived for the underway sea surface temperature and salinity data, by comparison with near surface CTD data. LADCP data are not discussed in this report. Note that the data processor was not a cruise participant, thus this report does not describe all details of the shipboard field data collection or the problems encountered. CTD station positions are shown in Figures 1a and b, while CTD station information is summarised in Table 1. Niskin bottle sampling at each station is summarised in Table 2. (see word document detailed below for figures and tables)

Further information is available in a word document available as part of the download.

This work was completed as part of ASAC projects 2655 and 2679 (ASAC_2655, ASAC_2679).

Related URL
Link: GET DATA
Description: Download point for the data - data


Link: VIEW PROJECT HOME PAGE
Description: Public information for ASAC project 2655


Link: VIEW PROJECT HOME PAGE
Description: Public information for ASAC project 2679


Link: VIEW RELATED INFORMATION
Description: Download point for the data - pdf Document


Link: VIEW RELATED INFORMATION
Description: Citation reference for this metadata record and dataset


Parent DIF
This data set description is a member of a collection. The collection is described in
BROKE-West


Geographic Coverage
 N: -61.67 S: -69.21  E: 80.04  W: 29.92

Temporal Coverage
Start Date: 2006-01-02
Stop Date: 2006-03-12


Location Keywords
OCEAN > SOUTHERN OCEAN
CONTINENT > ANTARCTICA
GEOGRAPHIC REGION > POLAR


Science Keywords
OCEANS >BATHYMETRY/SEAFLOOR TOPOGRAPHY >WATER DEPTH    [Definition]
OCEANS >OCEAN TEMPERATURE >WATER TEMPERATURE    [Definition]
OCEANS >SALINITY/DENSITY >CONDUCTIVITY    [Definition]
OCEANS >SALINITY/DENSITY >SALINITY    [Definition]


ISO Topic Category
OCEANS


Platform
SHIPS    [Information]
R/V AA >R/V Aurora Australis


Instrument
CTD >Conductivity, Temperature, Depth    [Information]
NISKIN BOTTLES    [Information]


Quality
SeaBird SBE9plus CTD serial 704, with dual temperature and conductivity sensors and a single SBE43 dissolved oxygen sensor (on the primary sensor pump line), was used for the entire cruise, mounted on a SeaBird 24 bottle rosette frame, together with a SBE32 24 position pylon and 22 x 10 litre General Oceanics Niskin bottles. The following additional sensors were mounted:

* Benthos model 2110 altimeter
* Tritech 200 kHz and 500 kHz altimeters
* Wetlabs fluorometer serial 296
* photosynthetically active radiation (i.e. PAR) sensor
* Wetlabs C-star transmissometer serial 899DR
* Sontek lowered ADCP (i.e. LADCP) with upward and downward looking transducer sets

CTD data were transmitted up a 6 mm seacable to a SBE11plusV2 deck unit, at a rate of 24 Hz, and data were logged simultaneously on 2 PC's using SeaBird data acquisition software 'Seasave'. The LADCP was powered by a separate battery pack, and data were logged internally and downloaded after each CTD cast. Note that physical mounting of the upward looking LADCP transducer set requires removal of 2 Niskin bottles, thus only 22 Niskins were fitted for the cruise.

The CTD deployment method was as follows:

* CTD initially deployed down to ~20 m
* after confirmation of pump operation, CTD returned up to just below the surface (depth dependent on sea state)
* after returning to just below the surface, downcast proper commenced.

For most casts, the package was stopped for 5 minutes on the upcast at ~50 m above the bottom, for logging of LADCP bottom track data.

Pre cruise temperature, conductivity and pressure calibrations were performed by the CSIRO Division of Marine and Atmospheric Research calibration facility (Table 3) (July to August 2005). Manufacturer supplied calibrations were used for the dissolved oxygen, fluorometer, transmissometer and altimeters. PAR data are uncalibrated. Final conductivity and dissolved oxygen calibrations derived from in situ Niskin bottle samples are listed later in the report.


Access Constraints
These data are publicly available for download from the provided URL. A pdf document providing further information about the data is also available for download from the provided URL.


Use Constraints
This data set conforms to the PICCCBY Attribution License
(http://creativecommons.org/licenses/by/3.0/).

Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=BROKE-We... when using these data.


Keywords
STATION
CTD
DEPTH
CONDUCTIVITY
TEMPERATURE
SALINITY


Data Set Progress
COMPLETE


Data Center
Australian Antarctic Data Centre, Australia    [Information]
Data Center URL: http://data.aad.gov.au

Data Center Personnel
Name: DATA OFFICER AADC
Phone: +61 3 6232 3244
Fax: +61 3 6232 3351
Email: metadata at aad.gov.au
Contact Address:
Australian Antarctic Division
203 Channel Highway
City: Kingston
Province or State: Tasmania
Postal Code: 7050
Country: Australia



Distribution
Distribution_Media: HTTP
Distribution_Size: 820 kb
Distribution_Format: pdf
Fees: free

Distribution_Media: HTTP
Distribution_Size: 14.9 MB
Distribution_Format: matlab, binary
Fees: Free


Personnel
MARK ROSENBERG
Role: INVESTIGATOR
Role: TECHNICAL CONTACT
Phone: +61 3 6226 7651
Fax: +61 3 6226 2973
Email: Mark.Rosenberg at aad.gov.au
Contact Address:
ACE CRC, c/- University of Tasmania
Private Bag 80
City: Hobart
Province or State: Tasmania
Postal Code: 7001
Country: Australia


REBECCA GORTON
Role: TECHNICAL CONTACT
Role: DIF AUTHOR
Phone: +61 3 6232 3587
Email: bec.gorton at aad.gov.au
Contact Address:
Australian Antarctic Data Centre
Channel Highway
Australian Antarctic Division
City: Kingston
Province or State: Tasmania
Postal Code: 7050
Country: Australia



Creation and Review Dates
DIF Creation Date: 2006-03-02
Last DIF Revision Date: 2014-01-10

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