Evaluation and application of palaeoceanographic proxies at the East Antarctic margin ...

• Main Author: Creac'h, Layla
• Format: Thesis
• Language: unknown
• Published: University of Tasmania 2024
• Subjects: Antarctic; Wilkes Land; Antarc*
• Online Access: https://dx.doi.org/10.25959/25413793.v1; https://figshare.utas.edu.au/articles/thesis/Evaluation_and_application_of_palaeoceanographic_proxies_at_the_East_Antarctic_margin/25413793/1

Palaeoceanographic studies based on geochemical proxies allow the reconstruction of ocean conditions under different climate regimes, which aids our understanding of how the climate system may respond to current anthropogenic disturbances. However, gaps remain in our knowledge of the biogeochemical cycles of some paleo-proxies in the marine environment, especially at geochemically complex interfaces such as ice-ocean margins. The aim of this thesis is to assess the reliability of several proxies of past ocean circulation and productivity in a region particularly sensitive to climate change: Wilkes Land margin. To do this, new geochemical datasets were generated through measurements of trace metal and isotope concentrations in six sediment cores and seawater samples collected from the East Antarctic margin. This project firstly assessed the ability of neodymium isotopes (εNd) to track past bottom water mass circulation at the East Antarctic margin ( Chapter 2 ). The authigenic ε Nd signal leached from bulk ...