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The relative abundance (%) of planktonic foraminifera over time in core BAR 9403, located off the coast of Sumatra

Created 25/06/2017

Updated 12/08/2023

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The advent of deep-sea drilling in the 1950's prompted the use of planktonic foraminifera (unicellular protozans) as palaeoceanographic indicators. They provide a natural archive of past environmental changes due to their global distribution, their prolific productivity and sensitivity to environmental variations.

The most obvious change in relative abundance in core BAR9403 (off the coast of Sumatra) is shown by sub-polar to transitional 'upwelling' species Ga. bulloides with abundances of 26% at approximately 14,000yrs BP and 22.7% during the Holocene. This is compared to the periods from Marine Isotope Stage (MIS) 3 to the Last Glacial Maximum (LGM) where the relative abundance of Ga. bulloides is generally <10%. Gr. menardii, a tropical 'upwelling' species, also increases its relative abundance during MIS 2 from <8% during MIS 3 to a peak abundance of 16% at ~17,000yrs BP.

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Title The relative abundance (%) of planktonic foraminifera over time in core BAR 9403, located off the coast of Sumatra
Language English
Licence Creative Commons Attribution 2.5 Australia
Landing Page https://data.gov.au/data/dataset/b014ffbc-774d-4e45-86ad-3844dcc0e88e
Contact Point
Australian National University
michelle.spooner8@gmail.com
Reference Period 25/06/2017
Geospatial Coverage
Map data © OpenStreetMap contributors
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        104.5,
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      ],
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        104.0,
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      [
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  "type": "Polygon"
}
Data Portal Data.gov.au