Proxy data from the Emerald Lake sediment record on Macquarie Island. ...
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)...
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| Format: | Dataset |
| Language: | English |
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NERC EDS UK Polar Data Centre
2023
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| Online Access: | https://dx.doi.org/10.5285/85c30cc3-6ce6-4a3d-be60-0bddbe69e5bb https://data.bas.ac.uk/full-record.php?id=GB/NERC/BAS/PDC/01699 |
| Summary: | 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. ... : 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 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 ... |
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