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Subantarctic zone oceanography - SAZ Project 1997-1998 - Sediment Trap Data

Entry ID: ASAC_2256_Sediment

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Summary

Abstract: Oceanographic processes in the subantarctic region contribute crucially to the physical and biogeochemical aspects of the global climate system. To explore and quantify these contributions, the Antarctic Cooperative Research Centre (CRC) organised the SAZ Project, a multidisciplinary, multiship investigation carried out south of Australia in the austral summer of 1997-1998.

Taken from the ... abstracts of the referenced papers:

The SAZ project organised by the Antarctic CRC has a continuing program of moored sinking particle trap studies in the Aub-Antarctic and Polar Frontal zones southwest of Tasmania along 140 degrees E. The first deployment obtained weekly or higher resolution samples through the austral summer from September 1997 through February 1998 at three locations: the central Sub-Antarctic Zone (47 degrees S, traps at 1000, 2000 and 3800 m depth), the Sub-Antarctic Front (51 degrees S, 1 trap at 3300 m) and above the Southeast Indian Ridge in the Polar Frontal Zone (54 degrees S, 2 traps at 800 and 1500 m). The particles were analysed for total mass, inorganic carbon, total carbon, nitrogen, silicon, and aluminium. Hence values for organic carbon, biogenic silica, and lithogenics were obtained, and the mass fluxes calculated. This report details the sites, moorings, data from the current meters and sediment traps, and results of analyses performed on the collected sediment trap material.

Sediment trap moorings were deployed from September 21, 1997 through February 21, 1998 at three locations south of Australia along 140 degrees E: at -47 degrees S in the central Subantarctic Zone (SAZ) with traps at 1060, 2050, and 3850 m depth, at-51 degrees S in the Subantarctic Front with one trap at 3080m, and at -54 degrees S in the Polar Front Zone(PFZ) with traps at 830 and 1580m. Particle fluxes were high at all the sites (18-32gm-2 yr-1 total mass and 0.5-1.4g organic carbon m-2 yr-1 at ~1000m, assuming minimal flux outside the sampled summer period). These values are similar to other Southern Ocean results and to the median estimated for the global ocean by Lampitt and Antia [1997], and emphasise that the Southern Ocean exports considerable carbon to the deep sea despite its "high-nutrient, low chlorophyll" characteristics. The SAZ site was dominated by carbonate (greater than 50% of total mass) and the PFZ site by biogenic silica (greater than 50% of total mass). Both sites exhibited high export in spring and late summer, with an intervening low flux period in December. For the 153 day collection period, particulate organic carbon export was somewhat higher in all the traps in the SAZ (range 0.57-0.84 gC m -L) than in the PFZ (range 0.31-0.53), with an intermediate value observed at the SAF (0.60). The fraction of surface organic carbon export (estimated from seasonal nutrient depletion, Lourey and Trull [2001]) reaching 1000 m was indistinguishable in the SAZ and PFZ, despite different algal communities.

Related URL

Link: VIEW PROJECT HOME PAGE

Description: Public information for ASAC project 2256

Geographic Coverage

(Click for Interactive Map)

Spatial coordinates

	N: -42.0	S: -55.0	E: 141.5	W: 141.5

Min Depth: 800 M Max Depth: 4000 M

Parent DIF

This data set description is a member of a collection. The collection is described in
ASAC_2256

Temporal Coverage

Start Date: 1997-09-01

Stop Date: 1998-03-31

Location Keywords

OCEAN > SOUTHERN OCEAN

GEOGRAPHIC REGION > POLAR

Science Keywords

OCEANS > MARINE SEDIMENTS > SEDIMENT COMPOSITION

OCEANS > MARINE SEDIMENTS > SEDIMENT TRANSPORT

ISO Topic Category

OCEANS

Platform

SHIPS

R/V AA > R/V Aurora Australis

Quality See the referenced papers for more information.

Access Constraints Copies of the referenced publications are available for download from the provided URL to AAD staff only.

A large amount of data are available in the referenced publications.

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=ASAC_225... when using these data.

Ancillary Keywords

SAZ

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: 24.6 MB

Distribution Format: pdf

Fees: free

Personnel

THOMAS WILLIAM TRULL

Role: INVESTIGATOR

Role: TECHNICAL CONTACT

Phone: +61 3 6226 2988

Fax: +61 3 6226 2973

Email: tom.trull at utas.edu.au

Contact Address:

GPO BOX 252-80

Antarctic CRC University of Tasmania

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

Publications/References

Trull T. W., Bray S. G., Manganini S. J., Honjo S., Francois R. (2001), Moored sediment trap measurements of carbon export in the Subantarctic and Polar Frontal Zones of the Southern Ocean, south of Australia, Journal of Geophysical Research, 106, C12, 31,489- 31,509

Bray, S.G., Trull, T.W., Manganini, S. (2000), SAZ Project moored sediment traps: Results of the 1997-1998 deployments, Antarctic CRC Research Report, 15, 1-128

Creation and Review Dates

DIF Creation Date: 2012-01-17

Last DIF Revision Date: 2012-01-18

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