Data

Diatom recovery from core MD88-787: Raw counts

Australian Ocean Data Network
Armand, Leanne ; De Deckker, Patrick ; Pichon, Jean-Jacques
Viewed: [[ro.stat.viewed]] Cited: [[ro.stat.cited]] Accessed: [[ro.stat.accessed]]
ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=http://catalogue-aodn.prod.aodn.org.au/geonetwork/srv/eng/search?uuid=e63afb70-5a9e-11dc-bd3f-00188b4c0af8&rft.title=Diatom recovery from core MD88-787: Raw counts&rft.identifier=http://catalogue-aodn.prod.aodn.org.au/geonetwork/srv/eng/search?uuid=e63afb70-5a9e-11dc-bd3f-00188b4c0af8&rft.description=Core MD88-787 was recovered during the French ASPARA IV cruise in 1988, aboard the Marion Dufresne. The core was located on the Tasman Fracture Zone of the Mid-Ocean Ridge, within the Polar Front Zone. A total of 69 diatom species and taxa were recorded in core MD88-787. Over time, the core indicates a reduction in the number of diatom valves in the sediments for the last glacial. This trend is not observed during the previous 'glacial' period in isotope-stage 4, but is again noted in isotope-stage 6. Interglacial isotope-stages 3 and 5 indicate higher- or equivalent-diatom content comparable to isotope-stage 1. The reduced diatom signal during the glacials appears odd since the expectation was for an enhanced diatom signal produced by the northward shifting fronts. The decrease in signal could be interpreted as being affected by sea-ice cover and the resulting change towards more lightly silicified diatom species.Maintenance and Update Frequency: notPlannedStatement: Material collected using a Kullenberg core aboard the research vessel Marion Dufresne. The method used to produce the diatom slides is detailed in the 'methodology' document uploaded with this record.Statement: The sediment was sampled every 10cm from the sediment surface down to a depth of 1030cm. Parameters: Core depth (cm) diatom species, diatom subtotal and silica subtotal.&rft.creator=Armand, Leanne &rft.creator=De Deckker, Patrick &rft.creator=Pichon, Jean-Jacques &rft.date=2007&rft.coverage=westlimit=145; southlimit=-56.50; eastlimit=145.5; northlimit=-56.00&rft.coverage=westlimit=145; southlimit=-56.50; eastlimit=145.5; northlimit=-56.00&rft.coverage=uplimit=3030.4; downlimit=3020&rft.coverage=uplimit=3030.4; downlimit=3020&rft_rights= http://creativecommons.org/licenses/by/2.5/au/&rft_rights=http://i.creativecommons.org/l/by/2.5/au/88x31.png&rft_rights=WWW:LINK-1.0-http--related&rft_rights=License Graphic&rft_rights=Creative Commons Attribution 2.5 Australia License&rft_rights=http://creativecommons.org/international/au/&rft_rights=WWW:LINK-1.0-http--related&rft_rights=WWW:LINK-1.0-http--related&rft_rights=License Text&rft_rights=The citation in a list of references is: citation author name/s (year metadata published), metadata title. Citation author organisation/s. File identifier and Data accessed at (add http link).&rft_rights=Users are kindly requested to contact the principal investigator for authorisation before utilising or reproducing any material&rft_rights=Creative Commons Attribution 2.5 Australia License http://creativecommons.org/licenses/by/2.5/au&rft_subject=biota&rft_subject=DIATOMS&rft_subject=EARTH SCIENCE&rft_subject=BIOLOGICAL CLASSIFICATION&rft_subject=PLANTS&rft_subject=MICROALGAE&rft_subject=Fragilariopsis kerguelensis&rft_subject=Fragilariopsis separanda&rft_subject=Thalassiosira lentiginosa&rft_subject=53120000&rft_subject=53001900&rft_subject=core_depth&rft_subject=taxonomic_name&rft_subject=taxonomic_group_count&rft.type=dataset&rft.language=English Access the data
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The citation in a list of references is: citation author name/s (year metadata published), metadata title. Citation author organisation/s. File identifier and Data accessed at (add http link).

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Brief description

Core MD88-787 was recovered during the French ASPARA IV cruise in 1988, aboard the Marion Dufresne. The core was located on the Tasman Fracture Zone of the Mid-Ocean Ridge, within the Polar Front Zone.

A total of 69 diatom species and taxa were recorded in core MD88-787. Over time, the core indicates a reduction in the number of diatom valves in the sediments for the last glacial. This trend is not observed during the previous 'glacial' period in isotope-stage 4, but is again noted in isotope-stage 6. Interglacial isotope-stages 3 and 5 indicate higher- or equivalent-diatom content comparable to isotope-stage 1. The reduced diatom signal during the glacials appears odd since the expectation was for an enhanced diatom signal produced by the northward shifting fronts. The decrease in signal could be interpreted as being affected by sea-ice cover and the resulting change towards more lightly silicified diatom species.

Lineage

Maintenance and Update Frequency: notPlanned
Statement: Material collected using a Kullenberg core aboard the research vessel Marion Dufresne.

The method used to produce the diatom slides is detailed in the 'methodology' document uploaded with this record.
Statement: The sediment was sampled every 10cm from the sediment surface down to a depth of 1030cm.

Parameters: Core depth (cm) diatom species, diatom subtotal and silica subtotal.

Notes

Credit
Centre des Faibles Radioactivities mixte CNRS CEA (France)
Credit
Institute of Antarctic and Southern Ocean Studies (IASOS)
Credit
Institut Français pour la Recherche et Technologie Polaires (IFRTP)
Credit
Terres Australes et Antarctiques Françaises (TAAF)
Credit
Australian Postgraduate Research Awards (APRA)
Purpose
To reconstruct the first sea-surface temperature and sea-ice record history of the Southern Ocean south of Australia.

Issued: 29 08 2007

Data time period: 1988 to 1988

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145.5,-56 145.5,-56.5 145,-56.5 145,-56 145.5,-56

145.25,-56.25

text: westlimit=145; southlimit=-56.50; eastlimit=145.5; northlimit=-56.00

text: uplimit=3030.4; downlimit=3020

Subjects
53001900 | 53120000 | BIOLOGICAL CLASSIFICATION | Diatoms | EARTH SCIENCE | Fragilariopsis kerguelensis | Fragilariopsis separanda | MICROALGAE | PLANTS | Thalassiosira lentiginosa | biota | core_depth | taxonomic_group_count | taxonomic_name |

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Other Information
Methodology - Preparation of diatom slides from sediment samples (App 1-1.pdf)

uri : https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/e63afb70-5a9e-11dc-bd3f-00188b4c0af8/attachments/App 1-1.pdf

Core MD88-787: Diatom raw counts (App 6-6 787.pdf)

uri : https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/e63afb70-5a9e-11dc-bd3f-00188b4c0af8/attachments/App 6-6 787.pdf

Identifiers
  • global : e63afb70-5a9e-11dc-bd3f-00188b4c0af8
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