Articles | Volume 23, issue 11
https://doi.org/10.5194/bg-23-3807-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-23-3807-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Diatom–environment relationships and limnological variability: an updated quantitative tool for palaeoclimatology on sub-Antarctic Macquarie Island
Caitlin A. Selfe
CORRESPONDING AUTHOR
Securing Antarctica's Environmental Future, Queensland University of Technology, Brisbane, 4000, Australia
Karina Meredith
Securing Antarctica's Environmental Future, Environment Research and Technology Group, Australian Nuclear Science and Technology Organisation, Lucas Heights, 2234, Australia
Liza McDonough
Securing Antarctica's Environmental Future, Environment Research and Technology Group, Australian Nuclear Science and Technology Organisation, Lucas Heights, 2234, Australia
Justine Shaw
Securing Antarctica's Environmental Future, Queensland University of Technology, Brisbane, 4000, Australia
Stephen J. Roberts
British Antarctic Survey, Cambridge, CB3 0ET, United Kingdom
Krystyna M. Saunders
Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, 7004, Australia
Australian Antarctic Division, Kingston, 7050, Australia
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Jonathan R. Adams, Dylan H. Rood, Klaus Wilcken, Stephen J. Roberts, and Joanne S. Johnson
Geochronology, 8, 255–277, https://doi.org/10.5194/gchron-8-255-2026, https://doi.org/10.5194/gchron-8-255-2026, 2026
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Ice sheet mass loss is adding to sea-level rise, and is expected to increase, but by how much and how fast remains uncertain. Isotopes produced in rock at the Earth’s surface provide records of past ice sheet thinning which help predict future change but are more effective if they are precise enough to determine past changes to the nearest thousand years. Carbon-14 is a unique isotope that provides an accurate record of past change since the last ice age, however, its precision can be improved.
Clément Duvert, Vanessa Solano, Dioni I. Cendón, Francesco Ulloa-Cedamanos, Liza K. McDonough, Robert G. M. Spencer, Niels C. Munksgaard, Lindsay B. Hutley, Jean-Sébastien Moquet, and David E. Butman
Biogeosciences, 23, 1755–1770, https://doi.org/10.5194/bg-23-1755-2026, https://doi.org/10.5194/bg-23-1755-2026, 2026
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This study examines the age and composition of carbon in tropical streams. We find that dissolved organic carbon (DOC) is centuries to millennia old, while dissolved inorganic carbon (DIC) is consistently younger, indicating a decoupling between the two. DOC age varies seasonally, with rainforest streams exporting younger DOC during high flow, while agricultural streams mobilise older DOC. Our results suggest land conversion alters carbon export, potentially worsening with climate change.
Jonathan R. Adams, Joanne S. Johnson, Stephen J. Roberts, Philippa J. Mason, Keir A. Nichols, Ryan A. Venturelli, Klaus Wilcken, Greg Balco, Brent Goehring, Brenda Hall, John Woodward, and Dylan H. Rood
The Cryosphere, 16, 4887–4905, https://doi.org/10.5194/tc-16-4887-2022, https://doi.org/10.5194/tc-16-4887-2022, 2022
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Glaciers in West Antarctica are experiencing significant ice loss. Geological data provide historical context for ongoing ice loss in West Antarctica, including constraints on likely future ice sheet behaviour in response to climatic warming. We present evidence from rare isotopes measured in rocks collected from an outcrop next to Pope Glacier. These data suggest that Pope Glacier thinned faster and sooner after the last ice age than previously thought.
Ashley N. Martin, Karina Meredith, Andy Baker, Marc D. Norman, and Eliza Bryan
Hydrol. Earth Syst. Sci., 25, 3837–3853, https://doi.org/10.5194/hess-25-3837-2021, https://doi.org/10.5194/hess-25-3837-2021, 2021
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We measured the silicon isotopic composition of groundwater from Rottnest Island, Western Australia, to investigate water–rock interactions in a coastal aquifer. Silicon isotopic ratios varied spatially across the island and were related to secondary mineral formation and vertical mixing within the aquifer. We find that silicate dissolution occurs in the freshwater–seawater transition zone, supporting the recent recognition of submarine groundwater discharge in the oceanic silicon isotope cycle.
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Short summary
This study presents an updated diatom–conductivity model to reconstruct past Southern Hemisphere westerly wind strength from lake sediments on sub-Antarctic Macquarie Island. We analysed diatom–environment relationships using seasonal and multi-year water chemistry and isotope data. Diatoms respond strongly to changes in lake water conductivity driven by wind-blown sea spray. The model provides a reliable tool for tracking long-term wind patterns and understanding past and future climate change.
This study presents an updated diatom–conductivity model to reconstruct past Southern Hemisphere...
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