Abstract:
This dataset presents the relative diatom abundances of 56 species/groups from the 132-120 ka interval in marine sediment core ANTA91-8 (-70.78 degN, 172.83 degE). This age interval corresponds to the peak of Marine Isotope Stage 5e. 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.
The age model for this dataset has been updated, with new tiepoints between the sediment core magnetic susceptibility and the LR04 benthic delta-O-18 stack selected to improve the graphical alignment.
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 ANTA91-8 (-70.78 degN, 172.83 degE, Cruise ANTA91) - VERSION 2 (Version 2.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/bda782a6-e89a-41a6-8791-f28001bc5d11
| 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/) Please cite this data as follows: Chadwick, M., & Allen, C. (2021). Marine Isotope Stage 5e diatom assemblages in marine sediment core ANTA91-8 (-70.78 degN, 172.83 degE, Cruise ANTA91) - VERSION 2 (Version 2.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/BDA782A6-E89A-41A6-8791-F28001BC5D11 |
| Creation Date: | 2021-06-16 |
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| Dataset Progress: | Complete |
| Dataset Language: | English |
| ISO Topic Categories: |
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| Parameters: |
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| Personnel: | |
| Name | PDC BAS |
| 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: Lisiecki L.E. & Raymo M.E. 2005. A Pliocene-Pleistocene stack of 57 globally distributed benthic delta-O-18 records. Paleoceanography, 20 (1): PA1003. 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. |
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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 0.7-2 cm and age resolution of 0.3-0.8 ka. |
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| Lineage: | Sediment core material was collected on Cruise ANTA91 (1990-1991) of the R/V Cariboo (http://www.mna.it/ts-samples/anta91-8c). For the diatom assemblage data, microscope slides were produced using a method adapted from Scherer (1994). Samples of 8-22 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 Aligned to the LR04 chronology by correlating the sediment core magnetic susceptibility to the LR04 benthic foraminiferadelta-O-18 stack (Lisiecki & Raymo 2005). Translation between the LR04 and EDC3 chronologies uses the conversion table in Parrenin et al. (2013). This data set is the updated version of the following dataset: https://doi.org/10/fqj8 |
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| Temporal Coverage: | |
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| Start Date | 1990-12-17 |
| End Date | 1990-12-17 |
| Paleo Temporal Coverage: | |
| Paleo Start Date | 132 ka |
| Paleo End Date | 120 ka |
| Chronostratigraphic Unit | N/A |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | -70.78 |
| Northernmost | -70.78 |
| Longitude | |
| Westernmost | 172.83 |
| Easternmost | 172.83 |
| Altitude | |
| Min Altitude | N/A |
| Max Altitude | N/A |
| Depth | |
| Min Depth | 2383 |
| Max Depth | N/A |
| Data Resolution: | |
| Latitude Resolution | N/A |
| Longitude Resolution | N/A |
| Horizontal Resolution Range | N/A |
| Vertical Resolution | N/A |
| Vertical Resolution Range | < 1 meter |
| Temporal Resolution | N/A |
| Temporal Resolution Range | N/A |
| Location: | |
| Location | Southern Ocean |
| Detailed Location | N/A |
| Sensor(s): |
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| Data Collection: | Instrumentation used: Gravity corer, Diatom settling tanks and bench, Olympus BH-2 light microscope |
| Distribution: | |
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| Distribution Media | Online Internet (HTTP) |
| Distribution Size | 9 kB |
| Distribution Format | ASCII |
| Fees | N/A |
| Data Storage: | This dataset constains 1 csv file: - MIS5e_Diatomabundance_ANTA91-8_new.csv ~9kB |