Late pleistocene palaeoceanographic and geochemical evolution of the South Tasman Rise ...
Global ocean circulation affects climate through its influence on transport and the carbon cycle. Past changes in global ocean circulation may have played an important role in past glacial-interglacial cycles. This study examines changes in deep-water circulation and carbonate chemistry in the South...
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| Format: | Thesis |
| Language: | unknown |
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University Of Tasmania
2023
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| Online Access: | https://dx.doi.org/10.25959/23230169 https://figshare.utas.edu.au/articles/thesis/Late_pleistocene_palaeoceanographic_and_geochemical_evolution_of_the_South_Tasman_Rise/23230169 |
| Summary: | Global ocean circulation affects climate through its influence on transport and the carbon cycle. Past changes in global ocean circulation may have played an important role in past glacial-interglacial cycles. This study examines changes in deep-water circulation and carbonate chemistry in the Southwest Pacific sector of the Southern Ocean over the past 160 kyrs using benthic foraminiferal stable isotopes and carbonate dissolution proxy records. Two sediment cores (located at 3310 m and 4002 m water depths) are the focus of this research and are positioned south of the Subtropical Front south of Australia in modern Circumpolar Deep Water. The chronostratigraphy of the cores is established by accelerator mass spectrometry (AMS) 14C dates, benthic and planktonic foraminiferal ˜í¬•180 and lithostratigraphy. Results of this study provide new, deep-water Southern Ocean ˜í¬•13C values from sites unlikely to be impacted by productivity effects and establishes that glacial (Last Glacial Maximum (LGM); 18-24 kyrs and ... |
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