Diatom recovery from core MD88-779: Raw counts
Core MD88-779 was taken during the 1988 French ASPARA IV cruise in the South East Indian Ocean aboard the Marion Dufresne. The core is situated on the South Tasman Rise (47º50.690S, 146º32.750E) at a depth of 2260m. Although the core recovered was 6.7m long, only the top 2.6m were studied as prelimi...
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ftands:oai:ands.org.au::1938663 2023-09-05T13:23:30+02:00 Diatom recovery from core MD88-779: Raw counts Department of Biological Sciences, Macquarie University (isOwnedBy) Spatial: 130.0,-48.0 155.0,-48.0 155.0,-35.0 130.0,-35.0 130.0,-48.0 Spatial: true https://researchdata.edu.au/diatom-recovery-core-raw-counts/1938663 http://data.gov.au/dataset/8ef0c08f-722f-4166-aefa-42a2a031b662 unknown data.gov.au https://researchdata.edu.au/diatom-recovery-core-raw-counts/1938663 http://data.gov.au/dataset/8ef0c08f-722f-4166-aefa-42a2a031b662 diatom-recovery-from-core-md88-779-raw-counts Department of Biological Sciences, Macquarie University 53001900 53120000 53150900 Azpeitia tabularis Biosphere Diatoms Fragilariopsis doliolus Hemidiscus cuneiformis Microbiota Roperia tesselata Thalassionema nitzschioides Thalassiosira lineata dataset ftands 2023-08-14T23:04:34Z Core MD88-779 was taken during the 1988 French ASPARA IV cruise in the South East Indian Ocean aboard the Marion Dufresne. The core is situated on the South Tasman Rise (47º50.690S, 146º32.750E) at a depth of 2260m. Although the core recovered was 6.7m long, only the top 2.6m were studied as preliminary investigations had indicated that this section covered the last two glacial cycles. \n\nA total of 37 diatom species and taxa were observed in the core samples, comprising predominantly warm-water fauna. The majority of samples were poorly preserved and showed high levels of dissolution making identification to species level often difficult. Species with greatest abundances were those more heavily silicified (e.g. Fragilariopsis kerguelansis), and to a lesser extent the warm-water forms (e.g. Fragilariopsis doliolu).\n\nThe complete loss of a diatom record at 170cm and 210/220cm in the core is extremely unusual. The diatom signal is interpreted as having been removed by increased water mass velocity, extreme post-depositional silica dissolution or decreased productivity. There is no sedimentological evidence from the core which provides further interpretation.\n\nThe diatom recovery from this core is considerably low when compared to samples from the Southern Ocean. App 1-1.pdf - App 6-5 779.pdf - aodn:bluenet_datasets_southern_indian_ocean - Core Data – Southern and Indian Ocean http://gcmd.nasa.gov/Resources/valids/keyword_list.html - http://www.marine.csiro.au/csquares/index.html - Dataset Southern Ocean Research Data Australia (Australian National Data Service - ANDS) Indian South Tasman Rise ENVELOPE(148.000,148.000,-47.500,-47.500) Southern Ocean |
institution |
Open Polar |
collection |
Research Data Australia (Australian National Data Service - ANDS) |
op_collection_id |
ftands |
language |
unknown |
topic |
53001900 53120000 53150900 Azpeitia tabularis Biosphere Diatoms Fragilariopsis doliolus Hemidiscus cuneiformis Microbiota Roperia tesselata Thalassionema nitzschioides Thalassiosira lineata |
spellingShingle |
53001900 53120000 53150900 Azpeitia tabularis Biosphere Diatoms Fragilariopsis doliolus Hemidiscus cuneiformis Microbiota Roperia tesselata Thalassionema nitzschioides Thalassiosira lineata Diatom recovery from core MD88-779: Raw counts |
topic_facet |
53001900 53120000 53150900 Azpeitia tabularis Biosphere Diatoms Fragilariopsis doliolus Hemidiscus cuneiformis Microbiota Roperia tesselata Thalassionema nitzschioides Thalassiosira lineata |
description |
Core MD88-779 was taken during the 1988 French ASPARA IV cruise in the South East Indian Ocean aboard the Marion Dufresne. The core is situated on the South Tasman Rise (47º50.690S, 146º32.750E) at a depth of 2260m. Although the core recovered was 6.7m long, only the top 2.6m were studied as preliminary investigations had indicated that this section covered the last two glacial cycles. \n\nA total of 37 diatom species and taxa were observed in the core samples, comprising predominantly warm-water fauna. The majority of samples were poorly preserved and showed high levels of dissolution making identification to species level often difficult. Species with greatest abundances were those more heavily silicified (e.g. Fragilariopsis kerguelansis), and to a lesser extent the warm-water forms (e.g. Fragilariopsis doliolu).\n\nThe complete loss of a diatom record at 170cm and 210/220cm in the core is extremely unusual. The diatom signal is interpreted as having been removed by increased water mass velocity, extreme post-depositional silica dissolution or decreased productivity. There is no sedimentological evidence from the core which provides further interpretation.\n\nThe diatom recovery from this core is considerably low when compared to samples from the Southern Ocean. App 1-1.pdf - App 6-5 779.pdf - aodn:bluenet_datasets_southern_indian_ocean - Core Data – Southern and Indian Ocean http://gcmd.nasa.gov/Resources/valids/keyword_list.html - http://www.marine.csiro.au/csquares/index.html - |
author2 |
Department of Biological Sciences, Macquarie University (isOwnedBy) |
format |
Dataset |
title |
Diatom recovery from core MD88-779: Raw counts |
title_short |
Diatom recovery from core MD88-779: Raw counts |
title_full |
Diatom recovery from core MD88-779: Raw counts |
title_fullStr |
Diatom recovery from core MD88-779: Raw counts |
title_full_unstemmed |
Diatom recovery from core MD88-779: Raw counts |
title_sort |
diatom recovery from core md88-779: raw counts |
publisher |
data.gov.au |
url |
https://researchdata.edu.au/diatom-recovery-core-raw-counts/1938663 http://data.gov.au/dataset/8ef0c08f-722f-4166-aefa-42a2a031b662 |
op_coverage |
Spatial: 130.0,-48.0 155.0,-48.0 155.0,-35.0 130.0,-35.0 130.0,-48.0 Spatial: true |
long_lat |
ENVELOPE(148.000,148.000,-47.500,-47.500) |
geographic |
Indian South Tasman Rise Southern Ocean |
geographic_facet |
Indian South Tasman Rise Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Department of Biological Sciences, Macquarie University |
op_relation |
https://researchdata.edu.au/diatom-recovery-core-raw-counts/1938663 http://data.gov.au/dataset/8ef0c08f-722f-4166-aefa-42a2a031b662 diatom-recovery-from-core-md88-779-raw-counts |
_version_ |
1776204103827849216 |