ArticleProceedings of the National Academy of Sciences of the United States of America2024
A marine record of Patagonian ice sheet changes over the past 140,000 years.
Article in Proceedings of the National Academy of Sciences of the United States of America, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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4 citing papers in PubMed, 16 citations in OpenAlex.
- Patagonian Ice Sheet discharge enhanced by AMOC slowdown through thermal bipolar seesaw.Proceedings of the National Academy of Sciences of the United States of America · 2026Article
- Orbital and millennial-scale forcing of the Patagonian Ice Sheet throughout the Last Glacial Cycle.Nature communications · 2025Article
- Contrasting Phylogeographic Patterns of Sandy vs. Rocky Sympatric Sister Species of SupralittoralEcology and evolution · 2025Article
- 790,000 years of millennial-scale Cape Horn Current variability and interhemispheric linkages.Nature communications · 2025Article
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Authors and funding
15 authors at 9 institutions in 6 countries.
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No grant is acknowledged in the PubMed record.
Abstract
Terrestrial glacial records from the Patagonian Andes and New Zealand Alps document quasi-synchronous Southern Hemisphere-wide glacier advances during the late Quaternary. However, these records are inherently incomplete. Here, we provide a continuous marine record of western-central Patagonian ice sheet (PIS) extent over a complete glacial-interglacial cycle back into the penultimate glacial (~140 ka). Sediment core MR16-09 PC03, located at 46°S and ~150 km offshore Chile, received high terrestrial sediment and meltwater input when the central PIS extended westward. We use biomarkers, foraminiferal oxygen isotopes, and major elemental data to reconstruct terrestrial sediment and freshwater input related to PIS variations. Our sediment record documents three intervals of general PIS marginal fluctuations, during Marine Isotope Stage (MIS) 6 (140 to 135 ka), MIS 4 (~70 to 60 ka), and late MIS 3 to MIS 2 (~40 to 18 ka). These higher terrigenous input intervals occurred during sea-level low stands, when the western PIS covered most of the Chilean fjords, which today retain glaciofluvial sediments. During these intervals, high-amplitude phases of enhanced sediment supply occur at millennial timescales, reflecting increased ice discharge most likely due to a growing PIS. We assign the late MIS 3 to MIS 2 phases and, by inference, older advances to Antarctic cold stages. We conclude that the increased sediment/meltwater release during Southern Hemisphere millennial-scale cold phases was likely related to higher precipitation caused by enhanced westerly winds at the northwestern margin of the PIS. Our records complement terrestrial archives and provide evidence for PIS climate sensitivity.
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