Description
A new deep ice-core record from the East Antarctic Plateau reaching at least 1.2 million years is now available through the Beyond EPICA Oldest Ice Core project (BEOIC). This record spans the Mid-Pleistocene Transition (MPT), when glacial-cycle pacing shifted from ~40,000 years to ~100,000 years, and therefore offers key constraints when combined water-isotope and greenhouse-gas measurements are interpreted together.
Recovering an accurate water-isotope signal from the deepest and oldest ice is challenging because diffusion in solid ice attenuates high-frequency variability. High-precision, high-resolution measurements combined with physically based estimates of isotope diffusion can be used to quantify signal attenuation and assess the feasibility of signal deconvolution.
This thesis presents a combined modelling and data study that quantifies diffusion-driven attenuation of the water isotope signal along the BEOIC using updated age–depth information and borehole temperature constraints. The resulting transfer functions are applied to high-resolution isotope sections from multiple depths to evaluate the recoverable bandwidth and to test spectral/Wiener restoration approaches, including the impact of measurement noise and sampling resolution on the reconstruction.
| Field of study | Earth & Climate Physics |
|---|---|
| Supervisor | Vasileios Gkinis |