Abstract:
This dataset presents the relative diatom abundances of 56 species/groups from the 132-120 ka interval in marine sediment core U1361A (-64.41 oN, 143.89 oE). This age interval corresponds to the peak of Marine Isotope Stage 5e (130- 116 ka). Microscope slides were prepared using a method adapted from Scherer (1994) and 300+ diatom valves were counted for each depth sample to produce the relative percentage abundance of each diatom species/group.
This project was funded by the UK Natural Environment Research Council Grant NE/L002531/1
Keywords:
Diatoms, Interglacial, Sediment core, Southern Ocean
Chadwick, M., & Allen, C. (2021). Marine Isotope Stage 5e diatom assemblages in marine sediment core U1361A (-64.41 degN, 143.89 degE, IODP Exp. 318) (Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/fe815073-28ee-462d-bee3-09e0da2f3866
| Access Constraints: | None |
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| Use Constraints: | This data is covered by a UK Open Government Licence (http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/) |
| Creation Date: | 2021-01-06 |
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| Dataset Progress: | Planned |
| Dataset Language: | English |
| ISO Topic Categories: |
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| Parameters: |
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| Personnel: | |
| Name | UK PDC |
| Role(s) | Metadata Author |
| Organisation | British Antarctic Survey |
| Name | Mr Matthew Chadwick |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Name | Dr Claire Allen |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Parent Dataset: | N/A |
| Reference: | Diatom processing reference: Scherer R.P. 1994. A new method for the determination of absolute abundance of diatoms and other silt-sized sedimentary particles. Journal of Paleolimnology, 12 (2): 171-179. Age model reference: Parrenin F., Masson-Delmotte V., Kohler P., Raynaud D., Paillard D., Schwander J., Barbante C., Landais A., Wegner A. & Jouzel J. 2013. Synchronisation of the LR04 stack with EDC isotopic variations on the EDC3 age scale. PANGAEA. Wilson D.J., Bertram R.A., Needham E.F., van de Flierdt T., Welsh K.J., McKay R.M., Mazumder A., Riesselman C.R., Jimenez-Espejo F.J. & Escutia C. 2018. Ice loss from the East Antarctic Ice Sheet during the late Pleistocene interglacials. Nature, 561: 383-386. |
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| Quality: | All diatom abundance values have an error of ±0.16 %. Ages for samples have a chronological uncertainty of ~2 ka. Sediment samples have a depth resolution of 2-5 cm and age resolution of 1.5-3 ka. |
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| Lineage: | Sediment core material was collected on IODP Exp. 318 (2010) of the R/V JOIDES Resolution (https://doi.org/10.2204/iodp.proc.318.101.2011). For the diatom assemblage data, microscope slides were produced using a method adapted from Scherer (1994). Samples of 7-20 mg were exposed to 10% Hydrochloric acid to remove any carbonate, 30% Hydrogen peroxide to break down organic material and a 4% Sodium Hexametaphosphate solution to promote disaggregation and placed in warm water bath for minimum 12 hours. The material was homogenised into a ~10cm water column and allowed to settle randomly onto coverslips over a minimum of 4 hours. The water was drained away and coverslips were mounted on microscope slides with Norland Optical Adhesive (NOA 61). Slides were investigated with a light microscope (Olympus BH-2 at x1000 magnification) and a minimum of 300 diatom valves were counted for each sample. Age Model Wilson et al. (2018) align core U1361A to the LR04 chronology by correlating the sedimentology to glacial/interglacial periods alongside biostratigraphic markers. Translation between the LR04 and EDC3 chronologies uses the conversion tables in Parrenin et al. (2013). |
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| Temporal Coverage: | |
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| Start Date | 2010-02-25 |
| End Date | 2010-02-25 |
| Paleo Temporal Coverage: | |
| Paleo Start Date | 132 ka |
| Paleo End Date | 120 ka |
| Chronostratigraphic Unit | N/A |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | -64.41 |
| Northernmost | -64.41 |
| Longitude | |
| Westernmost | 143.89 |
| Easternmost | 143.89 |
| Altitude | |
| Min Altitude | N/A |
| Max Altitude | N/A |
| Depth | |
| Min Depth | 3459 |
| Max Depth | N/A |
| Location: | |
| Location | Southern Ocean |
| Detailed Location | N/A |
| Sensor(s): |
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| Data Collection: | Instrumentation: Piston corer, Diatom settling tanks and bench, Olympus BH-2 light microscope. |
| Distribution: | |
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| Distribution Media | Online Internet (HTTP) |
| Distribution Size | 6 kB |
| Distribution Format | ASCII |
| Fees | N/A |
| Data Storage: | This dataset contains 1 csv file: - MIS5e_Diatomabundance_U1361A.csv ~6kB |