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Southern Ocean CTD data collected from the CASO cruise of the Aurora Australis, 2007-2008

Entry ID: au0806_CASO_CTD

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Summary

Abstract: Taken from the accompanying report:

Oceanographic measurements were collected aboard the Aurora Australis on cruise au0806 (voyage 6 2007/2008, 22nd March 2008 to 17th April 2008). This cruise completed the CASO oceanographic program begun on the CEAMARC cruise (au0803, voyage 3 2007/2008), with a full occupation of the SR3 transect between Antarctica and Tasmania.

CASO program objectives were:
... 1. to measure changes in water mass properties and inventories throughout the full ocean depth between Australia and Antarctica along 140oE (the CLIVAR/WOCE repeat section SR3), as part of a multi-national International Polar Year program to obtain a circumpolar snapshot of the Southern Ocean in austral summer 2007-8;
2. to estimate the transport of mass, heat and other properties south of Australia, and to compare results to previous occupations of the SR3 line and other sections in the Australian sector;
3. to deploy moorings near the Adelie Depression (142-145oE) as part of a joint Australia-France-Italy program to monitor changes in the properties and flow of Adelie Land Bottom Water;
4. to identify mechanisms responsible for variability in ocean climate south of Australia.
The CASO program (with a full occupation of the SR3 transect) was originally scheduled for a single cruise. The shipping schedule was re-arranged following an unexpected period in drydock, due to a problem with the ship's thrusters, and as a result the CASO program was split over the two cruises. Several of the southern stations occupied on the first cruise au0803 were repeated on the second cruise au0806, to minimise the impact on the data set of the time gap between the cruises.
A total of 131 CTD vertical profile stations were taken on au0803, and 73 CTD station were taken on au0806, most to within 20 metres of the bottom. During the 2 cruises, over 2900 Niskin bottle water samples were collected for the measurement of salinity, dissolved oxygen, nutrients (phosphate, nitrate+nitrite and silicate), 18O, CFC's, dissolved inorganic carbon, alkalinity, 14C, dissolved organic carbon, density (i.e. analysis of the effect of water composition on water density), germanium/silica/boron isotopes, trace metals, neodymium, chlorophyll-a, cell counts, pigments, genetic analyses, and other biological parameters, using a 24 bottle rosette sampler. Full depth current profiles were collected by an LADCP attached to the CTD package, while upper water column current profile data were collected by a ship mounted ADCP. Data were also collected by the array of ship's underway sensors.
This report describes the processing/calibration of the CTD 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. CTD station positions are shown in Figures 1 and 2, while CTD station information is summarised in Table 1. Mooring and drifter deployments/recoveries are summarised in Table 14. Mooring data from the Adelie Depression deployments are discussed in the mooring data reports Rosenberg (unpublished report, 2009) and Meijers (unpublished report, 2009). Further cruise itinerary/summary details can be found in the voyage leader reports (Australian Antarctic Division unpublished reports: Riddle, V3 2007/08 VL report; Rintoul, V6 2007/08 VL report). Hydrochemistry and CFC cruise reports are in Appendix 1 and Appendix 2.

Details about the data are available in a readme file and a full report in the download file.

Related URL

Link: GET DATA

Description: Download point for the CTD data

Link: VIEW PROJECT HOME PAGE

Description: Public information for ASAC project 2652

Link: VIEW PROJECT HOME PAGE

Description: Public information for ASAC project 2792

Link: VIEW RELATED INFORMATION

Description: Citation reference for this metadata record and dataset.

Geographic Coverage

(Click for Interactive Map)

Spatial coordinates

	N: -42.0	S: -64.0	E: 147.0	W: 139.0

Min Depth: 0 M Max Depth: 4892 M

Temporal Coverage

Start Date: 2008-03-22

Stop Date: 2008-04-17

Location Keywords

OCEAN > SOUTHERN OCEAN

GEOGRAPHIC REGION > POLAR

Science Keywords

OCEANS > OCEAN CHEMISTRY > DISSOLVED GASES

OCEANS > OCEAN CHEMISTRY > NITRATE

ISO Topic Category

OCEANS

Platform

SHIPS

R/V AA > R/V Aurora Australis

Instrument

CTD > Conductivity, Temperature, Depth

ADCP > Acoustic Doppler Current Profiler

Quality Further information about the quality of these data are available in the readme file and the pdf report contained in the download.

Taken from the readme file:

* The following CTD 2 dbar data are suspect (not removed from the data files)
(this same information is in the file sussctd.dat):

stn parameter pressure (dbar) comment
--- ...

Access Constraints These data are publicly 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=au0806_C... when using these data.

Ancillary Keywords

SALINOMETERS

OXYGEN ANALYZERS

Data Set Progress

COMPLETE

Data Center

Australian Antarctic Data Centre, Australia

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: 5.1 MB

Distribution Format: text, pdf, matlab

Fees: Free

Personnel

MARK ROSENBERG

Role: INVESTIGATOR

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

STEVE RINTOUL

Role: TECHNICAL CONTACT

Phone: +61 3 6232 5393

Fax: +61 3 6232 5123

Email: steve.rintoul at csiro.au

Contact Address:

CSIRO Marine and Atmospheric Research

GPO BOX 1538

City: Hobart

Province or State: Tasmania

Postal Code: 7001

Country: Australia

DAVE CONNELL

Role: DIF AUTHOR

Phone: +61 3 6232 3244

Fax: +61 3 6232 3351

Email: dave.connell at aad.gov.au

Contact Address:

Australian Antarctic Division

203 Channel Highway

City: Kingston

Province or State: Tasmania

Postal Code: 7050

Country: Australia

Creation and Review Dates

DIF Creation Date: 2010-06-25

Last DIF Revision Date: 2012-06-04

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