Abstract:
This dataset presents the relative diatom abundances of 55 species/groups from the 132-120 ka interval in marine sediment core MD03-2603 (-64.28 degN, 139.38 degE). 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 MD03-2603 (-64.28 degN, 139.38 degE, Cruise MD130) (Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/410f4e27-3214-466f-9de3-e19848d8c5c2
| 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: | Complete |
| 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: 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. Presti M., Barbara L., Denis D., Schmidt S., De Santis L. & Crosta X. 2011. Sediment delivery and depositional patterns off Adélie Land (East Antarctica) in relation to late Quaternary climatic cycles. Marine Geology, 284 (1-4): 96-113. |
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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 4 cm and age resolution of 0.4-0.9 ka. |
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| Lineage: | Sediment core material was collected on Cruise MD130 (2003) R/V Marion DuFresne II (https://doi.org/10.17600/3200040). 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 Presti et al. (2011) align core MD03-2603 to the LR04 chronology by correlating the sediment core Ba/Al and Ba/Ti ratios to the LR04 benthic foraminifera δ18O stack (Lisiecki & Raymo 2005). 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 | 2003-02-10 |
| End Date | 2003-02-10 |
| Paleo Temporal Coverage: | |
| Paleo Start Date | 132 ka |
| Paleo End Date | 120 ka |
| Chronostratigraphic Unit | N/A |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | -64.28 |
| Northernmost | -64.28 |
| Longitude | |
| Westernmost | 139.38 |
| Easternmost | 139.38 |
| Altitude | |
| Min Altitude | N/A |
| Max Altitude | N/A |
| Depth | |
| Min Depth | 3320 |
| Max Depth | N/A |
| Location: | |
| Location | Southern Ocean |
| Detailed Location | N/A |
| Sensor(s): |
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| Data Collection: | Instrumentation: Calypso corer, Diatom settling tanks and bench, Olympus BH-2 light microscope. |
| Distribution: | |
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| Distribution Media | Online Internet (HTTP) |
| Distribution Size | 8 kB |
| Distribution Format | ASCII |
| Fees | N/A |
| Data Storage: | This dataset contains 1 csv file: - MIS5e_Diatomabundance_MD03-2603.csv ~8kB |