Abstract:
The dataset comprises of proxy data from the Emerald Lake sediment record dating back to 12.1ka BP were extracted on Macquarie Island. Three independent methods to reconstruct past changes in Southern Hemisphere Westerly wind (SHW) intensity. Core scanning (ITRAX XRF) and multispectral data (SPECIM) originally published in Saunders et al. (2018) have been updated to the 2020 radiocarbon calibration curve.
This research was funded by NERC Standard grant NE/K004514/1 (D.A.H., S.J.R., L.S.), Swiss National Science Foundation Ambizione Postdoctoral Research Fellowship PZ00P2_136835/1 (K.M.S.), Swiss National Science Foundation Grant 200021_172586 (M.G.) and Australian Antarctic Science grants 3117 and 4156 (K.M.S.). K.M.S. was also supported by PhD funding as part of grant 2663 to A. McMinn, an Australian Postgraduate Award (2004-2008) and an Australian Institute of Nuclear Science and Engineering Postgraduate Research Award.
Keywords:
Lake sediments, Macquarie Island, Radiocarbon dating
short doi:10/jzr3
| Access Constraints: | No restrictions apply |
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| Use Constraints: | This data is governed by the NERC data policy http://www.nerc.ac.uk/research/sites/data/policy/ and supplied under Open Government Licence v.3 http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/. Cite as follows: Roberts, S., & Saunders, K. (2023). Proxy data from the Emerald Lake sediment record on Macquarie Island (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/85C30CC3-6CE6-4A3D-BE60-0BDDBE69E5BB |
| Creation Date: | 2022-12-21 |
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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 Polar Data Centre |
| Role(s) | Metadata Author |
| Organisation | British Antarctic Survey |
| Name | Dr Stephen J Roberts |
| Role(s) | Technical Contact, Investigator |
| Organisation | British Antarctic Survey |
| Name | Krystyna Saunders |
| Role(s) | Investigator |
| Organisation | University of Bern |
| Parent Dataset: | N/A |
| Reference: | Blaauw M and Christen JA. (2011) Flexible paleoclimate age-depth models using an autoregressive gamma process. Bayesian Analysis 6: 457-474. Heredia Barion, P., Roberts, S.J., Spiegel, C., et al. (2023). Holocene deglaciation and glacier readvances on the Fildes Peninsula, King George Island, NW Antarctic Peninsula. The Holocene. https://doi.org/10.1177/09596836231157059 Heredia Barion, P.A., Strelin, J.A., Roberts, S.J., et al. (2022). The impact of Holocene deglaciation and glacial dynamics on the landscapes and geomorphology of Potter Peninsula, King George Island (Isla 25 Mayo), NW Antarctic Peninsula. Frontiers in Earth Science https://doi.org/10.3389/feart.2022.1073075 Saunders, K.S., Roberts, S.J., Hodgson, D.A., et al., (2018). Holocene dynamics of the Southern Hemisphere westerly winds: possible links to CO2 outgassing. Nature Geoscience, 11 650-655. https://doi.org/10.1038/s41561-018-0186-5 |
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| Quality: | Age data includes minimum and maximum 95% confidence interval ranges. | |
| Lineage: | A series of lake sediment cores dating back to c. 12.1 ka BP were extracted from Emerald Lake on the west coast of sub-Antarctic Macquarie Island. We applied three independent methods to reconstruct past changes in Southern Hemisphere Westerly wind (SHW) intensity. 1) To reconstruct past sea salt aerosol inputs, we developed a method to track past changes in lake water conductivity (a function of sea salt aerosol input) using diatom-based inference models. 2) ITRAX XRF core scanning (XRFCS) analysis was used to track inputs of minerogenic aerosols into the lake, focusing on Ti as the most widely used indicator of allochthonous inputs 3) Cores were scanned using a Specim hyperspectral camera, which measures reflected optical properties between wavelengths from 400-1000 nm. The ratio of reflectance between 850 and 900 nm (R850/R900) was used as an additional indicator of minerogenic inputs We have updated the age depth model in Saunders et al. (2018) and applied this update to these datasets. Recalibration and age depth models have been updated to 2020 calibration curves (Sh20) in the R package BACON v. 2.5 for Bayesian age-depth modelling (Blaauw and Christen, 2011). |
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| Temporal Coverage: | |
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| Start Date | 2006-11-01 |
| End Date | 2013-11-30 |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | -54.54653 |
| Northernmost | -54.54653 |
| Longitude | |
| Westernmost | 158.8809 |
| Easternmost | 158.8809 |
| Altitude | |
| Min Altitude | N/A |
| Max Altitude | N/A |
| Depth | |
| Min Depth | N/A |
| Max Depth | N/A |
| Location: | |
| Location | Macquarie Island |
| Detailed Location | Emerald Lake, Macquarie Island |